head	1.7;
access;
symbols
	RELENG_9_1_0_RELEASE:1.2.2.2
	RELENG_9_1:1.2.2.2.0.2
	RELENG_9_1_BP:1.2.2.2
	RELENG_9:1.2.0.2;
locks; strict;
comment	@# @;


1.7
date	2013.07.11.00.34.38;	author svnexp;	state Exp;
branches;
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1.6
date	2013.04.28.00.41.54;	author svnexp;	state Exp;
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1.5
date	2013.02.08.05.09.54;	author svnexp;	state Exp;
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1.4
date	2012.11.17.03.36.33;	author svnexp;	state Exp;
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1.3
date	2012.10.22.18.25.04;	author dim;	state Exp;
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1.2
date	2012.03.14.00.09.36;	author theraven;	state Exp;
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1.1
date	2011.11.25.20.59.04;	author theraven;	state Exp;
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next	;

1.2.2.1
date	2012.05.22.18.30.14;	author theraven;	state dead;
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1.2.2.2
date	2012.05.22.18.30.14;	author theraven;	state Exp;
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1.2.2.3
date	2012.11.21.18.41.41;	author svnexp;	state Exp;
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1.2.2.4
date	2012.11.29.21.29.14;	author svnexp;	state Exp;
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1.2.2.5
date	2013.05.11.17.01.44;	author svnexp;	state Exp;
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1.2.2.6
date	2013.07.11.22.01.44;	author svnexp;	state Exp;
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1.2.2.7
date	2014.03.05.20.01.45;	author svnexp;	state Exp;
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next	;


desc
@@


1.7
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/253159
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@// -*- C++ -*-
//===--------------------------- string -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_STRING
#define _LIBCPP_STRING

/*
    string synopsis

namespace std
{

template <class stateT>
class fpos
{
private:
    stateT st;
public:
    fpos(streamoff = streamoff());

    operator streamoff() const;

    stateT state() const;
    void state(stateT);

    fpos& operator+=(streamoff);
    fpos  operator+ (streamoff) const;
    fpos& operator-=(streamoff);
    fpos  operator- (streamoff) const;
};

template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y);

template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y);
template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y);

template <class charT>
struct char_traits
{
    typedef charT     char_type;
    typedef ...       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    static void assign(char_type& c1, const char_type& c2) noexcept;
    static constexpr bool eq(char_type c1, char_type c2) noexcept;
    static constexpr bool lt(char_type c1, char_type c2) noexcept;

    static int              compare(const char_type* s1, const char_type* s2, size_t n);
    static size_t           length(const char_type* s);
    static const char_type* find(const char_type* s, size_t n, const char_type& a);
    static char_type*       move(char_type* s1, const char_type* s2, size_t n);
    static char_type*       copy(char_type* s1, const char_type* s2, size_t n);
    static char_type*       assign(char_type* s, size_t n, char_type a);

    static constexpr int_type  not_eof(int_type c) noexcept;
    static constexpr char_type to_char_type(int_type c) noexcept;
    static constexpr int_type  to_int_type(char_type c) noexcept;
    static constexpr bool      eq_int_type(int_type c1, int_type c2) noexcept;
    static constexpr int_type  eof() noexcept;
};

template <> struct char_traits<char>;
template <> struct char_traits<wchar_t>;

template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
class basic_string
{
public:
// types:
    typedef traits traits_type;
    typedef typename traits_type::char_type value_type;
    typedef Allocator allocator_type;
    typedef typename allocator_type::size_type size_type;
    typedef typename allocator_type::difference_type difference_type;
    typedef typename allocator_type::reference reference;
    typedef typename allocator_type::const_reference const_reference;
    typedef typename allocator_type::pointer pointer;
    typedef typename allocator_type::const_pointer const_pointer;
    typedef implementation-defined iterator;
    typedef implementation-defined const_iterator;
    typedef std::reverse_iterator<iterator> reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

    static const size_type npos = -1;

    basic_string()
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit basic_string(const allocator_type& a);
    basic_string(const basic_string& str);
    basic_string(basic_string&& str)
        noexcept(is_nothrow_move_constructible<allocator_type>::value);
    basic_string(const basic_string& str, size_type pos, size_type n = npos,
                 const allocator_type& a = allocator_type());
    basic_string(const value_type* s, const allocator_type& a = allocator_type());
    basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type());
    basic_string(size_type n, value_type c, const allocator_type& a = allocator_type());
    template<class InputIterator>
        basic_string(InputIterator begin, InputIterator end,
                     const allocator_type& a = allocator_type());
    basic_string(initializer_list<value_type>, const Allocator& = Allocator());
    basic_string(const basic_string&, const Allocator&);
    basic_string(basic_string&&, const Allocator&);

    ~basic_string();

    basic_string& operator=(const basic_string& str);
    basic_string& operator=(basic_string&& str)
        noexcept(
             allocator_type::propagate_on_container_move_assignment::value &&
             is_nothrow_move_assignable<allocator_type>::value);
    basic_string& operator=(const value_type* s);
    basic_string& operator=(value_type c);
    basic_string& operator=(initializer_list<value_type>);

    iterator       begin() noexcept;
    const_iterator begin() const noexcept;
    iterator       end() noexcept;
    const_iterator end() const noexcept;

    reverse_iterator       rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
    reverse_iterator       rend() noexcept;
    const_reverse_iterator rend() const noexcept;

    const_iterator         cbegin() const noexcept;
    const_iterator         cend() const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend() const noexcept;

    size_type size() const noexcept;
    size_type length() const noexcept;
    size_type max_size() const noexcept;
    size_type capacity() const noexcept;

    void resize(size_type n, value_type c);
    void resize(size_type n);

    void reserve(size_type res_arg = 0);
    void shrink_to_fit();
    void clear() noexcept;
    bool empty() const noexcept;

    const_reference operator[](size_type pos) const;
    reference       operator[](size_type pos);

    const_reference at(size_type n) const;
    reference       at(size_type n);

    basic_string& operator+=(const basic_string& str);
    basic_string& operator+=(const value_type* s);
    basic_string& operator+=(value_type c);
    basic_string& operator+=(initializer_list<value_type>);

    basic_string& append(const basic_string& str);
    basic_string& append(const basic_string& str, size_type pos, size_type n);
    basic_string& append(const value_type* s, size_type n);
    basic_string& append(const value_type* s);
    basic_string& append(size_type n, value_type c);
    template<class InputIterator>
        basic_string& append(InputIterator first, InputIterator last);
    basic_string& append(initializer_list<value_type>);

    void push_back(value_type c);
    void pop_back();
    reference       front();
    const_reference front() const;
    reference       back();
    const_reference back() const;

    basic_string& assign(const basic_string& str);
    basic_string& assign(basic_string&& str);
    basic_string& assign(const basic_string& str, size_type pos, size_type n);
    basic_string& assign(const value_type* s, size_type n);
    basic_string& assign(const value_type* s);
    basic_string& assign(size_type n, value_type c);
    template<class InputIterator>
        basic_string& assign(InputIterator first, InputIterator last);
    basic_string& assign(initializer_list<value_type>);

    basic_string& insert(size_type pos1, const basic_string& str);
    basic_string& insert(size_type pos1, const basic_string& str,
                         size_type pos2, size_type n);
    basic_string& insert(size_type pos, const value_type* s, size_type n);
    basic_string& insert(size_type pos, const value_type* s);
    basic_string& insert(size_type pos, size_type n, value_type c);
    iterator      insert(const_iterator p, value_type c);
    iterator      insert(const_iterator p, size_type n, value_type c);
    template<class InputIterator>
        iterator insert(const_iterator p, InputIterator first, InputIterator last);
    iterator      insert(const_iterator p, initializer_list<value_type>);

    basic_string& erase(size_type pos = 0, size_type n = npos);
    iterator      erase(const_iterator position);
    iterator      erase(const_iterator first, const_iterator last);

    basic_string& replace(size_type pos1, size_type n1, const basic_string& str);
    basic_string& replace(size_type pos1, size_type n1, const basic_string& str,
                          size_type pos2, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const value_type* s);
    basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c);
    basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str);
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n);
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s);
    basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c);
    template<class InputIterator>
        basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2);
    basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>);

    size_type copy(value_type* s, size_type n, size_type pos = 0) const;
    basic_string substr(size_type pos = 0, size_type n = npos) const;

    void swap(basic_string& str)
        noexcept(!allocator_type::propagate_on_container_swap::value ||
                 __is_nothrow_swappable<allocator_type>::value)

    const value_type* c_str() const noexcept;
    const value_type* data() const noexcept;

    allocator_type get_allocator() const noexcept;

    size_type find(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find(const value_type* s, size_type pos = 0) const noexcept;
    size_type find(value_type c, size_type pos = 0) const noexcept;

    size_type rfind(const basic_string& str, size_type pos = npos) const noexcept;
    size_type rfind(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type rfind(const value_type* s, size_type pos = npos) const noexcept;
    size_type rfind(value_type c, size_type pos = npos) const noexcept;

    size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find_first_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_first_of(const value_type* s, size_type pos = 0) const noexcept;
    size_type find_first_of(value_type c, size_type pos = 0) const noexcept;

    size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept;
    size_type find_last_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_last_of(const value_type* s, size_type pos = npos) const noexcept;
    size_type find_last_of(value_type c, size_type pos = npos) const noexcept;

    size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find_first_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_first_not_of(const value_type* s, size_type pos = 0) const noexcept;
    size_type find_first_not_of(value_type c, size_type pos = 0) const noexcept;

    size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept;
    size_type find_last_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_last_not_of(const value_type* s, size_type pos = npos) const noexcept;
    size_type find_last_not_of(value_type c, size_type pos = npos) const noexcept;

    int compare(const basic_string& str) const noexcept;
    int compare(size_type pos1, size_type n1, const basic_string& str) const;
    int compare(size_type pos1, size_type n1, const basic_string& str,
                size_type pos2, size_type n2) const;
    int compare(const value_type* s) const noexcept;
    int compare(size_type pos1, size_type n1, const value_type* s) const;
    int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const;

    bool __invariants() const;
};

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs,
          const basic_string<charT, traits, Allocator>& rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const charT* lhs , const basic_string<charT,traits,Allocator>&rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs);

template<class charT, class traits, class Allocator>
bool operator==(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator==(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator==(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const basic_string<charT,traits,Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
void swap(basic_string<charT, traits, Allocator>& lhs,
          basic_string<charT, traits, Allocator>& rhs)
            noexcept(noexcept(lhs.swap(rhs)));

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
operator>>(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);

template<class charT, class traits, class Allocator>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const basic_string<charT, traits, Allocator>& str);

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str,
        charT delim);

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);

typedef basic_string<char>    string;
typedef basic_string<wchar_t> wstring;
typedef basic_string<char16_t> u16string;
typedef basic_string<char32_t> u32string;

int                stoi  (const string& str, size_t* idx = 0, int base = 10);
long               stol  (const string& str, size_t* idx = 0, int base = 10);
unsigned long      stoul (const string& str, size_t* idx = 0, int base = 10);
long long          stoll (const string& str, size_t* idx = 0, int base = 10);
unsigned long long stoull(const string& str, size_t* idx = 0, int base = 10);

float       stof (const string& str, size_t* idx = 0);
double      stod (const string& str, size_t* idx = 0);
long double stold(const string& str, size_t* idx = 0);

string to_string(int val);
string to_string(unsigned val);
string to_string(long val);
string to_string(unsigned long val);
string to_string(long long val);
string to_string(unsigned long long val);
string to_string(float val);
string to_string(double val);
string to_string(long double val);

int                stoi  (const wstring& str, size_t* idx = 0, int base = 10);
long               stol  (const wstring& str, size_t* idx = 0, int base = 10);
unsigned long      stoul (const wstring& str, size_t* idx = 0, int base = 10);
long long          stoll (const wstring& str, size_t* idx = 0, int base = 10);
unsigned long long stoull(const wstring& str, size_t* idx = 0, int base = 10);

float       stof (const wstring& str, size_t* idx = 0);
double      stod (const wstring& str, size_t* idx = 0);
long double stold(const wstring& str, size_t* idx = 0);

wstring to_wstring(int val);
wstring to_wstring(unsigned val);
wstring to_wstring(long val);
wstring to_wstring(unsigned long val);
wstring to_wstring(long long val);
wstring to_wstring(unsigned long long val);
wstring to_wstring(float val);
wstring to_wstring(double val);
wstring to_wstring(long double val);

template <> struct hash<string>;
template <> struct hash<u16string>;
template <> struct hash<u32string>;
template <> struct hash<wstring>;

}  // std

*/

#include <__config>
#include <iosfwd>
#include <cstring>
#include <cstdio>  // For EOF.
#include <cwchar>
#include <algorithm>
#include <iterator>
#include <utility>
#include <memory>
#include <stdexcept>
#include <type_traits>
#include <initializer_list>
#include <__functional_base>
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
#include <cstdint>
#endif
#if defined(_LIBCPP_NO_EXCEPTIONS) || defined(_LIBCPP_DEBUG)
#include <cassert>
#endif

#include <__undef_min_max>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

// fpos

template <class _StateT>
class _LIBCPP_TYPE_VIS fpos
{
private:
    _StateT __st_;
    streamoff __off_;
public:
    _LIBCPP_INLINE_VISIBILITY fpos(streamoff __off = streamoff()) : __st_(), __off_(__off) {}

    _LIBCPP_INLINE_VISIBILITY operator streamoff() const {return __off_;}

    _LIBCPP_INLINE_VISIBILITY _StateT state() const {return __st_;}
    _LIBCPP_INLINE_VISIBILITY void state(_StateT __st) {__st_ = __st;}

    _LIBCPP_INLINE_VISIBILITY fpos& operator+=(streamoff __off) {__off_ += __off; return *this;}
    _LIBCPP_INLINE_VISIBILITY fpos  operator+ (streamoff __off) const {fpos __t(*this); __t += __off; return __t;}
    _LIBCPP_INLINE_VISIBILITY fpos& operator-=(streamoff __off) {__off_ -= __off; return *this;}
    _LIBCPP_INLINE_VISIBILITY fpos  operator- (streamoff __off) const {fpos __t(*this); __t -= __off; return __t;}
};

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
streamoff operator-(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) - streamoff(__y);}

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
bool operator==(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) == streamoff(__y);}

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
bool operator!=(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) != streamoff(__y);}

// char_traits

template <class _CharT>
struct _LIBCPP_TYPE_VIS char_traits
{
    typedef _CharT    char_type;
    typedef int       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
        {return int_type(EOF);}
};

template <class _CharT>
int
char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<_CharT>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
const _CharT*
char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

template <class _CharT>
_CharT*
char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
_CharT*
char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
_CharT*
char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

// char_traits<char>

template <>
struct _LIBCPP_TYPE_VIS char_traits<char>
{
    typedef char      char_type;
    typedef int       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
            {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return (unsigned char)__c1 < (unsigned char)__c2;}

    _LIBCPP_INLINE_VISIBILITY
    static int compare(const char_type* __s1, const char_type* __s2, size_t __n)
        {return memcmp(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static size_t length(const char_type* __s) {return strlen(__s);}
    _LIBCPP_INLINE_VISIBILITY
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
        {return (const char_type*)memchr(__s, to_int_type(__a), __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)memmove(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)memcpy(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* assign(char_type* __s, size_t __n, char_type __a)
        {return (char_type*)memset(__s, to_int_type(__a), __n);}

    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type((unsigned char)__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
        {return int_type(EOF);}
};

// char_traits<wchar_t>

template <>
struct _LIBCPP_TYPE_VIS char_traits<wchar_t>
{
    typedef wchar_t   char_type;
    typedef wint_t    int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    _LIBCPP_INLINE_VISIBILITY
    static int compare(const char_type* __s1, const char_type* __s2, size_t __n)
        {return wmemcmp(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static size_t length(const char_type* __s)
        {return wcslen(__s);}
    _LIBCPP_INLINE_VISIBILITY
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
        {return (const char_type*)wmemchr(__s, __a, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)wmemmove(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)wmemcpy(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* assign(char_type* __s, size_t __n, char_type __a)
        {return (char_type*)wmemset(__s, __a, __n);}

    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
        {return int_type(WEOF);}
};

#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS

template <>
struct _LIBCPP_TYPE_VIS char_traits<char16_t>
{
    typedef char16_t       char_type;
    typedef uint_least16_t int_type;
    typedef streamoff      off_type;
    typedef u16streampos   pos_type;
    typedef mbstate_t      state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
        {return int_type(0xDFFF);}
};

inline _LIBCPP_INLINE_VISIBILITY
int
char_traits<char16_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<char16_t>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

inline _LIBCPP_INLINE_VISIBILITY
const char16_t*
char_traits<char16_t>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

template <>
struct _LIBCPP_TYPE_VIS char_traits<char32_t>
{
    typedef char32_t       char_type;
    typedef uint_least32_t int_type;
    typedef streamoff      off_type;
    typedef u32streampos   pos_type;
    typedef mbstate_t      state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
        {return int_type(0xFFFFFFFF);}
};

inline _LIBCPP_INLINE_VISIBILITY
int
char_traits<char32_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<char32_t>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

inline _LIBCPP_INLINE_VISIBILITY
const char32_t*
char_traits<char32_t>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS

// basic_string

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x,
          const basic_string<_CharT, _Traits, _Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __x, const basic_string<_CharT,_Traits,_Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __x, const basic_string<_CharT,_Traits,_Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const _CharT* __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, _CharT __y);

template <bool>
class __basic_string_common
{
protected:
    void __throw_length_error() const;
    void __throw_out_of_range() const;
};

template <bool __b>
void
__basic_string_common<__b>::__throw_length_error() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    throw length_error("basic_string");
#else
    assert(!"basic_string length_error");
#endif
}

template <bool __b>
void
__basic_string_common<__b>::__throw_out_of_range() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    throw out_of_range("basic_string");
#else
    assert(!"basic_string out_of_range");
#endif
}

#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable: 4231 )
#endif // _MSC_VER
_LIBCPP_EXTERN_TEMPLATE(class __basic_string_common<true>)
#ifdef _MSC_VER
#pragma warning( pop )
#endif // _MSC_VER

#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

template <class _CharT, size_t = sizeof(_CharT)>
struct __padding
{
    unsigned char __xx[sizeof(_CharT)-1];
};

template <class _CharT>
struct __padding<_CharT, 1>
{
};

#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

template<class _CharT, class _Traits, class _Allocator>
class _LIBCPP_TYPE_VIS basic_string
    : private __basic_string_common<true>
{
public:
    typedef basic_string                                 __self;
    typedef _Traits                                      traits_type;
    typedef typename traits_type::char_type              value_type;
    typedef _Allocator                                   allocator_type;
    typedef allocator_traits<allocator_type>             __alloc_traits;
    typedef typename __alloc_traits::size_type           size_type;
    typedef typename __alloc_traits::difference_type     difference_type;
    typedef value_type&                                  reference;
    typedef const value_type&                            const_reference;
    typedef typename __alloc_traits::pointer             pointer;
    typedef typename __alloc_traits::const_pointer       const_pointer;
#ifdef _LIBCPP_DEBUG
    typedef __debug_iter<basic_string, pointer>          iterator;
    typedef __debug_iter<basic_string, const_pointer>    const_iterator;

    friend class __debug_iter<basic_string, pointer>;
    friend class __debug_iter<basic_string, const_pointer>;
#elif defined(_LIBCPP_RAW_ITERATORS)
    typedef pointer                                      iterator;
    typedef const_pointer                                const_iterator;
#else  // defined(_LIBCPP_RAW_ITERATORS)
    typedef __wrap_iter<pointer>                         iterator;
    typedef __wrap_iter<const_pointer>                   const_iterator;
#endif  // defined(_LIBCPP_RAW_ITERATORS)
    typedef _VSTD::reverse_iterator<iterator>             reverse_iterator;
    typedef _VSTD::reverse_iterator<const_iterator>       const_reverse_iterator;

private:

#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

    struct __long
    {
        pointer   __data_;
        size_type __size_;
        size_type __cap_;
    };

#if _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x01};
    enum {__long_mask  = 0x1ul};
#else  // _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x80};
    enum {__long_mask  = ~(size_type(~0) >> 1)};
#endif  // _LIBCPP_BIG_ENDIAN

    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};

    struct __short
    {
        value_type __data_[__min_cap];
        struct
            : __padding<value_type>
        {
            unsigned char __size_;
        };
    };

#else

    struct __long
    {
        size_type __cap_;
        size_type __size_;
        pointer   __data_;
    };

#if _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x80};
    enum {__long_mask  = ~(size_type(~0) >> 1)};
#else  // _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x01};
    enum {__long_mask  = 0x1ul};
#endif  // _LIBCPP_BIG_ENDIAN

    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};

    struct __short
    {
        union
        {
            unsigned char __size_;
            value_type __lx;
        };
        value_type __data_[__min_cap];
    };

#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

    union __lx{__long __lx; __short __lxx;};

    enum {__n_words = sizeof(__lx) / sizeof(size_type)};

    struct __raw
    {
        size_type __words[__n_words];
    };

    struct __rep
    {
        union
        {
            __long  __l;
            __short __s;
            __raw   __r;
        };
    };

    __compressed_pair<__rep, allocator_type> __r_;

#ifdef _LIBCPP_DEBUG

    pair<iterator*, const_iterator*> __iterator_list_;

    _LIBCPP_INLINE_VISIBILITY iterator*&       __get_iterator_list(iterator*)       {return __iterator_list_.first;}
    _LIBCPP_INLINE_VISIBILITY const_iterator*& __get_iterator_list(const_iterator*) {return __iterator_list_.second;}

#endif  // _LIBCPP_DEBUG

public:
    static const size_type npos = -1;

    _LIBCPP_INLINE_VISIBILITY basic_string()
        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
    _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a);
    basic_string(const basic_string& __str);
    basic_string(const basic_string& __str, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string(basic_string&& __str)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(basic_string&& __str, const allocator_type& __a);
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY basic_string(const value_type* __s);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const value_type* __s, const allocator_type& __a);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const value_type* __s, size_type __n);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const value_type* __s, size_type __n, const allocator_type& __a);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(size_type __n, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(size_type __n, value_type __c, const allocator_type& __a);
    basic_string(const basic_string& __str, size_type __pos, size_type __n = npos,
                 const allocator_type& __a = allocator_type());
    template<class _InputIterator>
        _LIBCPP_INLINE_VISIBILITY
        basic_string(_InputIterator __first, _InputIterator __last);
    template<class _InputIterator>
        _LIBCPP_INLINE_VISIBILITY
        basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string(initializer_list<value_type> __il);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(initializer_list<value_type> __il, const allocator_type& __a);
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    ~basic_string();

    basic_string& operator=(const basic_string& __str);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string& operator=(basic_string&& __str)
        _NOEXCEPT_(__alloc_traits::propagate_on_container_move_assignment::value &&
                   is_nothrow_move_assignable<allocator_type>::value);
#endif
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const value_type* __s) {return assign(__s);}
    basic_string& operator=(value_type __c);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& operator=(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifndef _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY
    iterator begin() _NOEXCEPT
        {return iterator(__get_pointer());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator begin() const _NOEXCEPT
        {return const_iterator(__get_pointer());}
    _LIBCPP_INLINE_VISIBILITY
    iterator end() _NOEXCEPT
        {return iterator(__get_pointer() + size());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator end() const _NOEXCEPT
        {return const_iterator(__get_pointer() + size());}
#else  // _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY iterator       begin()       {return iterator(this, __get_pointer());}
    _LIBCPP_INLINE_VISIBILITY const_iterator begin() const {return const_iterator(this, data());}
    _LIBCPP_INLINE_VISIBILITY iterator       end()         {return iterator(this, __get_pointer() + size());}
    _LIBCPP_INLINE_VISIBILITY const_iterator end() const   {return const_iterator(this, data() + size());}
#endif  // _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY
    reverse_iterator rbegin() _NOEXCEPT
        {return reverse_iterator(end());}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rbegin() const _NOEXCEPT
        {return const_reverse_iterator(end());}
    _LIBCPP_INLINE_VISIBILITY
    reverse_iterator rend() _NOEXCEPT
        {return reverse_iterator(begin());}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rend() const _NOEXCEPT
        {return const_reverse_iterator(begin());}

    _LIBCPP_INLINE_VISIBILITY
    const_iterator cbegin() const _NOEXCEPT
        {return begin();}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator cend() const _NOEXCEPT
        {return end();}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crbegin() const _NOEXCEPT
        {return rbegin();}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crend() const _NOEXCEPT
        {return rend();}

    _LIBCPP_INLINE_VISIBILITY size_type size() const _NOEXCEPT
        {return __is_long() ? __get_long_size() : __get_short_size();}
    _LIBCPP_INLINE_VISIBILITY size_type length() const _NOEXCEPT {return size();}
    _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY size_type capacity() const _NOEXCEPT
        {return (__is_long() ? __get_long_cap() : __min_cap) - 1;}

    void resize(size_type __n, value_type __c);
    _LIBCPP_INLINE_VISIBILITY void resize(size_type __n) {resize(__n, value_type());}

    void reserve(size_type res_arg = 0);
    _LIBCPP_INLINE_VISIBILITY
    void shrink_to_fit() _NOEXCEPT {reserve();}
    _LIBCPP_INLINE_VISIBILITY
    void clear() _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY bool empty() const _NOEXCEPT {return size() == 0;}

    _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __pos) const;
    _LIBCPP_INLINE_VISIBILITY reference       operator[](size_type __pos);

    const_reference at(size_type __n) const;
    reference       at(size_type __n);

    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const basic_string& __str) {return append(__str);}
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const value_type* __s)         {return append(__s);}
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(value_type __c)            {push_back(__c); return *this;}
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(initializer_list<value_type> __il) {return append(__il);}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    _LIBCPP_INLINE_VISIBILITY
    basic_string& append(const basic_string& __str);
    basic_string& append(const basic_string& __str, size_type __pos, size_type __n);
    basic_string& append(const value_type* __s, size_type __n);
    basic_string& append(const value_type* __s);
    basic_string& append(size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            basic_string&
        >::type
        append(_InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            basic_string&
        >::type
        append(_ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& append(initializer_list<value_type> __il) {return append(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    void push_back(value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    void pop_back();
    _LIBCPP_INLINE_VISIBILITY reference       front();
    _LIBCPP_INLINE_VISIBILITY const_reference front() const;
    _LIBCPP_INLINE_VISIBILITY reference       back();
    _LIBCPP_INLINE_VISIBILITY const_reference back() const;

    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(const basic_string& __str);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(basic_string&& str)
        {*this = _VSTD::move(str); return *this;}
#endif
    basic_string& assign(const basic_string& __str, size_type __pos, size_type __n);
    basic_string& assign(const value_type* __s, size_type __n);
    basic_string& assign(const value_type* __s);
    basic_string& assign(size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            basic_string&
        >::type
        assign(_InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            basic_string&
        >::type
        assign(_ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    _LIBCPP_INLINE_VISIBILITY
    basic_string& insert(size_type __pos1, const basic_string& __str);
    basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n);
    basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
    basic_string& insert(size_type __pos, const value_type* __s);
    basic_string& insert(size_type __pos, size_type __n, value_type __c);
    iterator      insert(const_iterator __pos, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    iterator      insert(const_iterator __pos, size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            iterator
        >::type
        insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            iterator
        >::type
        insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    iterator insert(const_iterator __pos, initializer_list<value_type> __il)
                    {return insert(__pos, __il.begin(), __il.end());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    basic_string& erase(size_type __pos = 0, size_type __n = npos);
    _LIBCPP_INLINE_VISIBILITY
    iterator      erase(const_iterator __pos);
    _LIBCPP_INLINE_VISIBILITY
    iterator      erase(const_iterator __first, const_iterator __last);

    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str);
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
    basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const basic_string& __str);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
            __is_input_iterator<_InputIterator>::value,
            basic_string&
        >::type
        replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il)
        {return replace(__i1, __i2, __il.begin(), __il.end());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const;
    _LIBCPP_INLINE_VISIBILITY
    basic_string substr(size_type __pos = 0, size_type __n = npos) const;

    _LIBCPP_INLINE_VISIBILITY
    void swap(basic_string& __str)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value);

    _LIBCPP_INLINE_VISIBILITY
    const value_type* c_str() const _NOEXCEPT {return data();}
    _LIBCPP_INLINE_VISIBILITY
    const value_type* data() const _NOEXCEPT  {return _VSTD::__to_raw_pointer(__get_pointer());}

    _LIBCPP_INLINE_VISIBILITY
    allocator_type get_allocator() const _NOEXCEPT {return __alloc();}

    _LIBCPP_INLINE_VISIBILITY
    size_type find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
    size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
    size_type rfind(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    int compare(const basic_string& __str) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    int compare(size_type __pos1, size_type __n1, const basic_string& __str) const;
    int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) const;
    int compare(const value_type* __s) const _NOEXCEPT;
    int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
    int compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const;

    _LIBCPP_INLINE_VISIBILITY bool __invariants() const;

    _LIBCPP_INLINE_VISIBILITY
    bool __is_long() const _NOEXCEPT
        {return bool(__r_.first().__s.__size_ & __short_mask);}

private:
    _LIBCPP_INLINE_VISIBILITY
    allocator_type& __alloc() _NOEXCEPT
        {return __r_.second();}
    _LIBCPP_INLINE_VISIBILITY
    const allocator_type& __alloc() const _NOEXCEPT
        {return __r_.second();}

#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

    _LIBCPP_INLINE_VISIBILITY
    void __set_short_size(size_type __s) _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
#   else
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
#   endif

    _LIBCPP_INLINE_VISIBILITY
    size_type __get_short_size() const _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {return __r_.first().__s.__size_ >> 1;}
#   else
        {return __r_.first().__s.__size_;}
#   endif

#else  // _LIBCPP_ALTERNATE_STRING_LAYOUT

    _LIBCPP_INLINE_VISIBILITY
    void __set_short_size(size_type __s) _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
#   else
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
#   endif

    _LIBCPP_INLINE_VISIBILITY
    size_type __get_short_size() const _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {return __r_.first().__s.__size_;}
#   else
        {return __r_.first().__s.__size_ >> 1;}
#   endif

#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

    _LIBCPP_INLINE_VISIBILITY
    void __set_long_size(size_type __s) _NOEXCEPT
        {__r_.first().__l.__size_ = __s;}
    _LIBCPP_INLINE_VISIBILITY
    size_type __get_long_size() const _NOEXCEPT
        {return __r_.first().__l.__size_;}
    _LIBCPP_INLINE_VISIBILITY
    void __set_size(size_type __s) _NOEXCEPT
        {if (__is_long()) __set_long_size(__s); else __set_short_size(__s);}

    _LIBCPP_INLINE_VISIBILITY
    void __set_long_cap(size_type __s) _NOEXCEPT
        {__r_.first().__l.__cap_  = __long_mask | __s;}
    _LIBCPP_INLINE_VISIBILITY
    size_type __get_long_cap() const _NOEXCEPT
        {return __r_.first().__l.__cap_ & size_type(~__long_mask);}

    _LIBCPP_INLINE_VISIBILITY
    void __set_long_pointer(pointer __p) _NOEXCEPT
        {__r_.first().__l.__data_ = __p;}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_long_pointer() _NOEXCEPT
        {return __r_.first().__l.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_long_pointer() const _NOEXCEPT
        {return __r_.first().__l.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_short_pointer() _NOEXCEPT
        {return pointer_traits<pointer>::pointer_to(__r_.first().__s.__data_[0]);}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_short_pointer() const _NOEXCEPT
        {return pointer_traits<const_pointer>::pointer_to(__r_.first().__s.__data_[0]);}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_pointer() _NOEXCEPT
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_pointer() const _NOEXCEPT
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}

    _LIBCPP_INLINE_VISIBILITY
    void __zero() _NOEXCEPT
        {
            size_type (&__a)[__n_words] = __r_.first().__r.__words;
            for (unsigned __i = 0; __i < __n_words; ++__i)
                __a[__i] = 0;
        }

    template <size_type __a> static
        _LIBCPP_INLINE_VISIBILITY
        size_type __align(size_type __s) _NOEXCEPT
            {return __s + (__a-1) & ~(__a-1);}
    enum {__alignment = 16};
    static _LIBCPP_INLINE_VISIBILITY
    size_type __recommend(size_type __s) _NOEXCEPT
        {return (__s < __min_cap ? __min_cap :
                 __align<sizeof(value_type) < __alignment ?
                            __alignment/sizeof(value_type) : 1 > (__s+1)) - 1;}

    void __init(const value_type* __s, size_type __sz, size_type __reserve);
    void __init(const value_type* __s, size_type __sz);
    void __init(size_type __n, value_type __c);

    template <class _InputIterator>
    typename enable_if
    <
         __is_input_iterator  <_InputIterator>::value &&
        !__is_forward_iterator<_InputIterator>::value,
        void
    >::type
    __init(_InputIterator __first, _InputIterator __last);

    template <class _ForwardIterator>
    typename enable_if
    <
        __is_forward_iterator<_ForwardIterator>::value,
        void
    >::type
    __init(_ForwardIterator __first, _ForwardIterator __last);

    void __grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                   size_type __n_copy,  size_type __n_del,     size_type __n_add = 0);
    void __grow_by_and_replace(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                               size_type __n_copy,  size_type __n_del,
                               size_type __n_add, const value_type* __p_new_stuff);

    _LIBCPP_INLINE_VISIBILITY
    void __erase_to_end(size_type __pos);

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string& __str)
        {__copy_assign_alloc(__str, integral_constant<bool,
                      __alloc_traits::propagate_on_container_copy_assignment::value>());}

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string& __str, true_type)
        {
            if (__alloc() != __str.__alloc())
            {
                clear();
                shrink_to_fit();
            }
            __alloc() = __str.__alloc();
        }

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string&, false_type) _NOEXCEPT
        {}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    void __move_assign(basic_string& __str, false_type);
    _LIBCPP_INLINE_VISIBILITY
    void __move_assign(basic_string& __str, true_type)
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
#endif

    _LIBCPP_INLINE_VISIBILITY
    void
    __move_assign_alloc(basic_string& __str)
        _NOEXCEPT_(
            !__alloc_traits::propagate_on_container_move_assignment::value ||
            is_nothrow_move_assignable<allocator_type>::value)
    {__move_assign_alloc(__str, integral_constant<bool,
                      __alloc_traits::propagate_on_container_move_assignment::value>());}

    _LIBCPP_INLINE_VISIBILITY
    void __move_assign_alloc(basic_string& __c, true_type)
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
        {
            __alloc() = _VSTD::move(__c.__alloc());
        }

    _LIBCPP_INLINE_VISIBILITY
    void __move_assign_alloc(basic_string&, false_type)
        _NOEXCEPT
        {}

    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type& __x, allocator_type& __y)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value)
        {__swap_alloc(__x, __y, integral_constant<bool,
                      __alloc_traits::propagate_on_container_swap::value>());}

    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type& __x, allocator_type& __y, true_type)
        _NOEXCEPT_(__is_nothrow_swappable<allocator_type>::value)
        {
            using _VSTD::swap;
            swap(__x, __y);
        }
    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type&, allocator_type&, false_type) _NOEXCEPT
        {}

    _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
    _LIBCPP_INLINE_VISIBILITY void __invalidate_iterators_past(size_type);

    friend basic_string operator+<>(const basic_string&, const basic_string&);
    friend basic_string operator+<>(const value_type*, const basic_string&);
    friend basic_string operator+<>(value_type, const basic_string&);
    friend basic_string operator+<>(const basic_string&, const value_type*);
    friend basic_string operator+<>(const basic_string&, value_type);
};

template <class _CharT, class _Traits, class _Allocator>
#ifndef _LIBCPP_DEBUG
_LIBCPP_INLINE_VISIBILITY inline
#endif
void
basic_string<_CharT, _Traits, _Allocator>::__invalidate_all_iterators()
{
#ifdef _LIBCPP_DEBUG
    iterator::__remove_all(this);
    const_iterator::__remove_all(this);
#endif  // _LIBCPP_DEBUG
}

template <class _CharT, class _Traits, class _Allocator>
#ifndef _LIBCPP_DEBUG
_LIBCPP_INLINE_VISIBILITY inline
#endif
void
basic_string<_CharT, _Traits, _Allocator>::__invalidate_iterators_past(size_type
#ifdef _LIBCPP_DEBUG
                                                                        __pos
#endif
                                                                      )
{
#ifdef _LIBCPP_DEBUG
    const_iterator __beg = begin();
    if (__iterator_list_.first)
    {
        for (iterator* __p = __iterator_list_.first; __p;)
        {
            if (*__p - __beg > static_cast<difference_type>(__pos))
            {
                iterator* __n = __p;
                __p = __p->__next;
                __n->__remove_owner();
            }
            else
                __p = __p->__next;
        }
    }
    if (__iterator_list_.second)
    {
        for (const_iterator* __p = __iterator_list_.second; __p;)
        {
            if (*__p - __beg > static_cast<difference_type>(__pos))
            {
                const_iterator* __n = __p;
                __p = __p->__next;
                __n->__remove_owner();
            }
            else
                __p = __p->__next;
        }
    }
#endif  // _LIBCPP_DEBUG
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string()
    _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
{
    __zero();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
    : __r_(__a)
{
    __zero();
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz, size_type __reserve)
{
    if (__reserve > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__reserve < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__reserve);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
    traits_type::assign(__p[__sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz)
{
    if (__sz > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__sz < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__sz);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
    traits_type::assign(__p[__sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, const allocator_type& __a)
    : __r_(__a)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n, const allocator_type& __a)
    : __r_(__a)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str)
    : __r_(__alloc_traits::select_on_container_copy_construction(__str.__alloc()))
{
    if (!__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, const allocator_type& __a)
    : __r_(__a)
{
    if (!__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
    : __r_(_VSTD::move(__str.__r_))
{
    __str.__zero();
#ifdef _LIBCPP_DEBUG
    __str.__invalidate_all_iterators();
#endif
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str, const allocator_type& __a)
    : __r_(__a)
{
    if (__a == __str.__alloc() || !__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
    __str.__zero();
#ifdef _LIBCPP_DEBUG
    __str.__invalidate_all_iterators();
#endif
}

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c)
{
    if (__n > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__n < __min_cap)
    {
        __set_short_size(__n);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__n);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__n);
    }
    traits_type::assign(_VSTD::__to_raw_pointer(__p), __n, __c);
    traits_type::assign(__p[__n], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c)
{
    __init(__n, __c);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c, const allocator_type& __a)
    : __r_(__a)
{
    __init(__n, __c);
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, size_type __pos, size_type __n,
                                                        const allocator_type& __a)
    : __r_(__a)
{
    size_type __str_sz = __str.size();
    if (__pos > __str_sz)
        this->__throw_out_of_range();
    __init(__str.data() + __pos, _VSTD::min(__n, __str_sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
template <class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    void
>::type
basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
{
    __zero();
#ifndef _LIBCPP_NO_EXCEPTIONS
    try
    {
#endif  // _LIBCPP_NO_EXCEPTIONS
    for (; __first != __last; ++__first)
        push_back(*__first);
#ifndef _LIBCPP_NO_EXCEPTIONS
    }
    catch (...)
    {
        if (__is_long())
            __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
        throw;
    }
#endif  // _LIBCPP_NO_EXCEPTIONS
}

template <class _CharT, class _Traits, class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    void
>::type
basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __sz = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__sz > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__sz < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__sz);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    for (; __first != __last; ++__first, ++__p)
        traits_type::assign(*__p, *__first);
    traits_type::assign(*__p, value_type());
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last)
{
    __init(__first, __last);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last,
                                                        const allocator_type& __a)
    : __r_(__a)
{
    __init(__first, __last);
}

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il)
{
    __init(__il.begin(), __il.end());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il, const allocator_type& __a)
    : __r_(__a)
{
    __init(__il.begin(), __il.end());
}

#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::~basic_string()
{
    __invalidate_all_iterators();
    if (__is_long())
        __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace
    (size_type __old_cap, size_type __delta_cap, size_type __old_sz,
     size_type __n_copy,  size_type __n_del,     size_type __n_add, const value_type* __p_new_stuff)
{
    size_type __ms = max_size();
    if (__delta_cap > __ms - __old_cap - 1)
        this->__throw_length_error();
    pointer __old_p = __get_pointer();
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
                          __ms - 1;
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
    __invalidate_all_iterators();
    if (__n_copy != 0)
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
    if (__n_add != 0)
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy, __p_new_stuff, __n_add);
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
    if (__sec_cp_sz != 0)
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del, __sec_cp_sz);
    if (__old_cap+1 != __min_cap)
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
    __set_long_pointer(__p);
    __set_long_cap(__cap+1);
    __old_sz = __n_copy + __n_add + __sec_cp_sz;
    __set_long_size(__old_sz);
    traits_type::assign(__p[__old_sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                                                     size_type __n_copy,  size_type __n_del,     size_type __n_add)
{
    size_type __ms = max_size();
    if (__delta_cap > __ms - __old_cap - 1)
        this->__throw_length_error();
    pointer __old_p = __get_pointer();
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
                          __ms - 1;
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
    __invalidate_all_iterators();
    if (__n_copy != 0)
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
    if (__sec_cp_sz != 0)
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del,
                          __sec_cp_sz);
    if (__old_cap+1 != __min_cap)
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
    __set_long_pointer(__p);
    __set_long_cap(__cap+1);
}

// assign

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __cap = capacity();
    if (__cap >= __n)
    {
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
        traits_type::move(__p, __s, __n);
        traits_type::assign(__p[__n], value_type());
        __set_size(__n);
        __invalidate_iterators_past(__n);
    }
    else
    {
        size_type __sz = size();
        __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(size_type __n, value_type __c)
{
    size_type __cap = capacity();
    if (__cap < __n)
    {
        size_type __sz = size();
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
    }
    else
        __invalidate_iterators_past(__n);
    value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
    traits_type::assign(__p, __n, __c);
    traits_type::assign(__p[__n], value_type());
    __set_size(__n);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(value_type __c)
{
    pointer __p;
    if (__is_long())
    {
        __p = __get_long_pointer();
        __set_long_size(1);
    }
    else
    {
        __p = __get_short_pointer();
        __set_short_size(1);
    }
    traits_type::assign(*__p, __c);
    traits_type::assign(*++__p, value_type());
    __invalidate_iterators_past(1);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str)
{
    if (this != &__str)
    {
        __copy_assign_alloc(__str);
        assign(__str);
    }
    return *this;
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, false_type)
{
    if (__alloc() != __str.__alloc())
        assign(__str);
    else
        __move_assign(__str, true_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type)
    _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
{
    clear();
    shrink_to_fit();
    __r_.first() = __str.__r_.first();
    __move_assign_alloc(__str);
    __str.__zero();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(basic_string&& __str)
    _NOEXCEPT_(__alloc_traits::propagate_on_container_move_assignment::value &&
               is_nothrow_move_assignable<allocator_type>::value)
{
    __move_assign(__str, integral_constant<bool,
          __alloc_traits::propagate_on_container_move_assignment::value>());
    return *this;
}

#endif

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
{
    clear();
    for (; __first != __last; ++__first)
        push_back(*__first);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    size_type __cap = capacity();
    if (__cap < __n)
    {
        size_type __sz = size();
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
    }
    else
        __invalidate_iterators_past(__n);
    pointer __p = __get_pointer();
    for (; __first != __last; ++__first, ++__p)
        traits_type::assign(*__p, *__first);
    traits_type::assign(*__p, value_type());
    __set_size(__n);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str)
{
    return assign(__str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, size_type __pos, size_type __n)
{
    size_type __sz = __str.size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    return assign(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return assign(__s, traits_type::length(__s));
}

// append

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __cap = capacity();
    size_type __sz = size();
    if (__cap - __sz >= __n)
    {
        if (__n)
        {
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
            traits_type::copy(__p + __sz, __s, __n);
            __sz += __n;
            __set_size(__sz);
            traits_type::assign(__p[__sz], value_type());
        }
    }
    else
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __sz, 0, __n, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(size_type __n, value_type __c)
{
    if (__n)
    {
        size_type __cap = capacity();
        size_type __sz = size();
        if (__cap - __sz < __n)
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
        pointer __p = __get_pointer();
        traits_type::assign(_VSTD::__to_raw_pointer(__p) + __sz, __n, __c);
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::push_back(value_type __c)
{
    bool __is_short = !__is_long();
    size_type __cap;
    size_type __sz;
    if (__is_short)
    {
        __cap = __min_cap - 1;
        __sz = __get_short_size();
    }
    else
    {
        __cap = __get_long_cap() - 1;
        __sz = __get_long_size();
    }
    if (__sz == __cap)
    {
        __grow_by(__cap, 1, __sz, __sz, 0);
        __is_short = !__is_long();
    }
    pointer __p;
    if (__is_short)
    {
        __p = __get_short_pointer() + __sz;
        __set_short_size(__sz+1);
    }
    else
    {
        __p = __get_long_pointer() + __sz;
        __set_long_size(__sz+1);
    }
    traits_type::assign(*__p, __c);
    traits_type::assign(*++__p, value_type());
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::append(_InputIterator __first, _InputIterator __last)
{
    for (; __first != __last; ++__first)
        push_back(*__first);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::append(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __sz = size();
    size_type __cap = capacity();
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__n)
    {
        if (__cap - __sz < __n)
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
        pointer __p = __get_pointer() + __sz;
        for (; __first != __last; ++__p, ++__first)
            traits_type::assign(*__p, *__first);
        traits_type::assign(*__p, value_type());
        __set_size(__sz + __n);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str)
{
    return append(__str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, size_type __pos, size_type __n)
{
    size_type __sz = __str.size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    return append(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return append(__s, traits_type::length(__s));
}

// insert

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    size_type __cap = capacity();
    if (__cap - __sz >= __n)
    {
        if (__n)
        {
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
            size_type __n_move = __sz - __pos;
            if (__n_move != 0)
            {
                if (__p + __pos <= __s && __s < __p + __sz)
                    __s += __n;
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
            }
            traits_type::move(__p + __pos, __s, __n);
            __sz += __n;
            __set_size(__sz);
            traits_type::assign(__p[__sz], value_type());
        }
    }
    else
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n, value_type __c)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    if (__n)
    {
        size_type __cap = capacity();
        value_type* __p;
        if (__cap - __sz >= __n)
        {
            __p = _VSTD::__to_raw_pointer(__get_pointer());
            size_type __n_move = __sz - __pos;
            if (__n_move != 0)
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
        }
        else
        {
            __grow_by(__cap, __sz + __n - __cap, __sz, __pos, 0, __n);
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
        }
        traits_type::assign(__p + __pos, __n, __c);
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
>::type
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last)
{
    size_type __old_sz = size();
    difference_type __ip = __pos - begin();
    for (; __first != __last; ++__first)
        push_back(*__first);
    pointer __p = __get_pointer();
    _VSTD::rotate(__p + __ip, __p + __old_sz, __p + size());
    return iterator(__p + __ip);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
>::type
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last)
{
    size_type __ip = static_cast<size_type>(__pos - begin());
    size_type __sz = size();
    size_type __cap = capacity();
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__n)
    {
        value_type* __p;
        if (__cap - __sz >= __n)
        {
            __p = _VSTD::__to_raw_pointer(__get_pointer());
            size_type __n_move = __sz - __ip;
            if (__n_move != 0)
                traits_type::move(__p + __ip + __n, __p + __ip, __n_move);
        }
        else
        {
            __grow_by(__cap, __sz + __n - __cap, __sz, __ip, 0, __n);
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
        }
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
        for (__p += __ip; __first != __last; ++__p, ++__first)
            traits_type::assign(*__p, *__first);
    }
    return begin() + __ip;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str)
{
    return insert(__pos1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str,
                                                  size_type __pos2, size_type __n)
{
    size_type __str_sz = __str.size();
    if (__pos2 > __str_sz)
        this->__throw_out_of_range();
    return insert(__pos1, __str.data() + __pos2, _VSTD::min(__n, __str_sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return insert(__pos, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, value_type __c)
{
    size_type __ip = static_cast<size_type>(__pos - begin());
    size_type __sz = size();
    size_type __cap = capacity();
    value_type* __p;
    if (__cap == __sz)
    {
        __grow_by(__cap, 1, __sz, __ip, 0, 1);
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
    }
    else
    {
        __p = _VSTD::__to_raw_pointer(__get_pointer());
        size_type __n_move = __sz - __ip;
        if (__n_move != 0)
            traits_type::move(__p + __ip + 1, __p + __ip, __n_move);
    }
    traits_type::assign(__p[__ip], __c);
    traits_type::assign(__p[++__sz], value_type());
    __set_size(__sz);
    return begin() + static_cast<difference_type>(__ip);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, size_type __n, value_type __c)
{
    difference_type __p = __pos - begin();
    insert(static_cast<size_type>(__p), __n, __c);
    return begin() + __p;
}

// replace

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    __n1 = _VSTD::min(__n1, __sz - __pos);
    size_type __cap = capacity();
    if (__cap - __sz + __n1 >= __n2)
    {
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
        if (__n1 != __n2)
        {
            size_type __n_move = __sz - __pos - __n1;
            if (__n_move != 0)
            {
                if (__n1 > __n2)
                {
                    traits_type::move(__p + __pos, __s, __n2);
                    traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
                    goto __finish;
                }
                if (__p + __pos < __s && __s < __p + __sz)
                {
                    if (__p + __pos + __n1 <= __s)
                        __s += __n2 - __n1;
                    else // __p + __pos < __s < __p + __pos + __n1
                    {
                        traits_type::move(__p + __pos, __s, __n1);
                        __pos += __n1;
                        __s += __n2;
                        __n2 -= __n1;
                        __n1 = 0;
                    }
                }
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
            }
        }
        traits_type::move(__p + __pos, __s, __n2);
__finish:
        __sz += __n2 - __n1;
        __set_size(__sz);
        __invalidate_iterators_past(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    else
        __grow_by_and_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, size_type __n2, value_type __c)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    __n1 = _VSTD::min(__n1, __sz - __pos);
    size_type __cap = capacity();
    value_type* __p;
    if (__cap - __sz + __n1 >= __n2)
    {
        __p = _VSTD::__to_raw_pointer(__get_pointer());
        if (__n1 != __n2)
        {
            size_type __n_move = __sz - __pos - __n1;
            if (__n_move != 0)
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
        }
    }
    else
    {
        __grow_by(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2);
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
    }
    traits_type::assign(__p + __pos, __n2, __c);
    __sz += __n2 - __n1;
    __set_size(__sz);
    __invalidate_iterators_past(__sz);
    traits_type::assign(__p[__sz], value_type());
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
    __is_input_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2,
                                                   _InputIterator __j1, _InputIterator __j2)
{
    for (; true; ++__i1, ++__j1)
    {
        if (__i1 == __i2)
        {
            if (__j1 != __j2)
                insert(__i1, __j1, __j2);
            break;
        }
        if (__j1 == __j2)
        {
            erase(__i1, __i2);
            break;
        }
        traits_type::assign(const_cast<value_type&>(*__i1), *__j1);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str)
{
    return replace(__pos1, __n1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str,
                                                   size_type __pos2, size_type __n2)
{
    size_type __str_sz = __str.size();
    if (__pos2 > __str_sz)
        this->__throw_out_of_range();
    return replace(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2, __str_sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return replace(__pos, __n1, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const basic_string& __str)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1),
                   __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c);
}

// erase

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    if (__n)
    {
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
        __n = _VSTD::min(__n, __sz - __pos);
        size_type __n_move = __sz - __pos - __n;
        if (__n_move != 0)
            traits_type::move(__p + __pos, __p + __pos + __n, __n_move);
        __sz -= __n;
        __set_size(__sz);
        __invalidate_iterators_past(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __pos)
{
    iterator __b = begin();
    size_type __r = static_cast<size_type>(__pos - __b);
    erase(__r, 1);
    return __b + static_cast<difference_type>(__r);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __first, const_iterator __last)
{
    iterator __b = begin();
    size_type __r = static_cast<size_type>(__first - __b);
    erase(__r, static_cast<size_type>(__last - __first));
    return __b + static_cast<difference_type>(__r);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::pop_back()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    size_type __sz;
    if (__is_long())
    {
        __sz = __get_long_size() - 1;
        __set_long_size(__sz);
        traits_type::assign(*(__get_long_pointer() + __sz), value_type());
    }
    else
    {
        __sz = __get_short_size() - 1;
        __set_short_size(__sz);
        traits_type::assign(*(__get_short_pointer() + __sz), value_type());
    }
    __invalidate_iterators_past(__sz);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::clear() _NOEXCEPT
{
    __invalidate_all_iterators();
    if (__is_long())
    {
        traits_type::assign(*__get_long_pointer(), value_type());
        __set_long_size(0);
    }
    else
    {
        traits_type::assign(*__get_short_pointer(), value_type());
        __set_short_size(0);
    }
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__erase_to_end(size_type __pos)
{
    if (__is_long())
    {
        traits_type::assign(*(__get_long_pointer() + __pos), value_type());
        __set_long_size(__pos);
    }
    else
    {
        traits_type::assign(*(__get_short_pointer() + __pos), value_type());
        __set_short_size(__pos);
    }
    __invalidate_iterators_past(__pos);
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::resize(size_type __n, value_type __c)
{
    size_type __sz = size();
    if (__n > __sz)
        append(__n - __sz, __c);
    else
        __erase_to_end(__n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::max_size() const _NOEXCEPT
{
    size_type __m = __alloc_traits::max_size(__alloc());
#if _LIBCPP_BIG_ENDIAN
    return (__m <= ~__long_mask ? __m : __m/2) - 1;
#else
    return __m - 1;
#endif
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::reserve(size_type __res_arg)
{
    if (__res_arg > max_size())
        this->__throw_length_error();
    size_type __cap = capacity();
    size_type __sz = size();
    __res_arg = _VSTD::max(__res_arg, __sz);
    __res_arg = __recommend(__res_arg);
    if (__res_arg != __cap)
    {
        pointer __new_data, __p;
        bool __was_long, __now_long;
        if (__res_arg == __min_cap - 1)
        {
            __was_long = true;
            __now_long = false;
            __new_data = __get_short_pointer();
            __p = __get_long_pointer();
        }
        else
        {
            if (__res_arg > __cap)
                __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
            else
            {
            #ifndef _LIBCPP_NO_EXCEPTIONS
                try
                {
            #endif  // _LIBCPP_NO_EXCEPTIONS
                    __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
            #ifndef _LIBCPP_NO_EXCEPTIONS
                }
                catch (...)
                {
                    return;
                }
            #else  // _LIBCPP_NO_EXCEPTIONS
                if (__new_data == nullptr)
                    return;
            #endif  // _LIBCPP_NO_EXCEPTIONS
            }
            __now_long = true;
            __was_long = __is_long();
            __p = __get_pointer();
        }
        traits_type::copy(_VSTD::__to_raw_pointer(__new_data),
                          _VSTD::__to_raw_pointer(__p), size()+1);
        if (__was_long)
            __alloc_traits::deallocate(__alloc(), __p, __cap+1);
        if (__now_long)
        {
            __set_long_cap(__res_arg+1);
            __set_long_size(__sz);
            __set_long_pointer(__new_data);
        }
        else
            __set_short_size(__sz);
        __invalidate_all_iterators();
    }
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos) const
{
#ifdef __LIBCPP_DEBUG
    assert(__pos <= size());
#endif
    return *(data() + __pos);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos)
{
#ifdef __LIBCPP_DEBUG
    assert(__pos < size());
#endif
    return *(__get_pointer() + __pos);
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) const
{
    if (__n >= size())
        this->__throw_out_of_range();
    return (*this)[__n];
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n)
{
    if (__n >= size())
        this->__throw_out_of_range();
    return (*this)[__n];
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::front()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *__get_pointer();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::front() const
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *data();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::back()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *(__get_pointer() + size() - 1);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::back() const
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *(data() + size() - 1);
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::copy(value_type* __s, size_type __n, size_type __pos) const
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    size_type __rlen = _VSTD::min(__n, __sz - __pos);
    traits_type::copy(__s, data() + __pos, __rlen);
    return __rlen;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
basic_string<_CharT, _Traits, _Allocator>::substr(size_type __pos, size_type __n) const
{
    return basic_string(*this, __pos, __n, __alloc());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value)
{
    _VSTD::swap(__r_.first(), __str.__r_.first());
    __swap_alloc(__alloc(), __str.__alloc());
#ifdef _LIBCPP_DEBUG
    __invalidate_all_iterators();
    __str.__invalidate_all_iterators();
#endif  // _LIBCPP_DEBUG
}

// find

template <class _Traits>
struct _LIBCPP_HIDDEN __traits_eq
{
    typedef typename _Traits::char_type char_type;
    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const char_type& __x, const char_type& __y) _NOEXCEPT
        {return _Traits::eq(__x, __y);}
};

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
                                                size_type __pos,
                                                size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz || __sz - __pos < __n)
        return npos;
    if (__n == 0)
        return __pos;
    const value_type* __p = data();
    const value_type* __r = _VSTD::search(__p + __pos, __p + __sz, __s, __s + __n,
                                     __traits_eq<traits_type>());
    if (__r == __p + __sz)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const basic_string& __str,
                                                size_type __pos) const _NOEXCEPT
{
    return find(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
                                                size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(value_type __c,
                                                size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos >= __sz)
        return npos;
    const value_type* __p = data();
    const value_type* __r = traits_type::find(__p + __pos, __sz - __pos, __c);
    if (__r == 0)
        return npos;
    return static_cast<size_type>(__r - __p);
}

// rfind

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
                                                 size_type __pos,
                                                 size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    __pos = _VSTD::min(__pos, __sz);
    if (__n < __sz - __pos)
        __pos += __n;
    else
        __pos = __sz;
    const value_type* __p = data();
    const value_type* __r = _VSTD::find_end(__p, __p + __pos, __s, __s + __n,
                                       __traits_eq<traits_type>());
    if (__n > 0 && __r == __p + __pos)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const basic_string& __str,
                                                 size_type __pos) const _NOEXCEPT
{
    return rfind(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
                                                 size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return rfind(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(value_type __c,
                                                 size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__sz)
    {
        if (__pos < __sz)
            ++__pos;
        else
            __pos = __sz;
        const value_type* __p = data();
        for (const value_type* __ps = __p + __pos; __ps != __p;)
        {
            if (traits_type::eq(*--__ps, __c))
                return static_cast<size_type>(__ps - __p);
        }
    }
    return npos;
}

// find_first_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
                                                         size_type __pos,
                                                         size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos >= __sz || __n == 0)
        return npos;
    const value_type* __p = data();
    const value_type* __r = _VSTD::find_first_of(__p + __pos, __p + __sz, __s,
                                            __s + __n, __traits_eq<traits_type>());
    if (__r == __p + __sz)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const basic_string& __str,
                                                         size_type __pos) const _NOEXCEPT
{
    return find_first_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
                                                         size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_first_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(value_type __c,
                                                         size_type __pos) const _NOEXCEPT
{
    return find(__c, __pos);
}

// find_last_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
                                                        size_type __pos,
                                                        size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    if (__n != 0)
    {
        size_type __sz = size();
        if (__pos < __sz)
            ++__pos;
        else
            __pos = __sz;
        const value_type* __p = data();
        for (const value_type* __ps = __p + __pos; __ps != __p;)
        {
            const value_type* __r = traits_type::find(__s, __n, *--__ps);
            if (__r)
                return static_cast<size_type>(__ps - __p);
        }
    }
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const basic_string& __str,
                                                        size_type __pos) const _NOEXCEPT
{
    return find_last_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
                                                        size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_last_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(value_type __c,
                                                        size_type __pos) const _NOEXCEPT
{
    return rfind(__c, __pos);
}

// find_first_not_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
                                                             size_type __pos,
                                                             size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos < __sz)
    {
        const value_type* __p = data();
        const value_type* __pe = __p + __sz;
        for (const value_type* __ps = __p + __pos; __ps != __pe; ++__ps)
            if (traits_type::find(__s, __n, *__ps) == 0)
                return static_cast<size_type>(__ps - __p);
    }
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const basic_string& __str,
                                                             size_type __pos) const _NOEXCEPT
{
    return find_first_not_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
                                                             size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_first_not_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(value_type __c,
                                                             size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos < __sz)
    {
        const value_type* __p = data();
        const value_type* __pe = __p + __sz;
        for (const value_type* __ps = __p + __pos; __ps != __pe; ++__ps)
            if (!traits_type::eq(*__ps, __c))
                return static_cast<size_type>(__ps - __p);
    }
    return npos;
}

// find_last_not_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
                                                            size_type __pos,
                                                            size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos < __sz)
        ++__pos;
    else
        __pos = __sz;
    const value_type* __p = data();
    for (const value_type* __ps = __p + __pos; __ps != __p;)
        if (traits_type::find(__s, __n, *--__ps) == 0)
            return static_cast<size_type>(__ps - __p);
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const basic_string& __str,
                                                            size_type __pos) const _NOEXCEPT
{
    return find_last_not_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
                                                            size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_last_not_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(value_type __c,
                                                            size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos < __sz)
        ++__pos;
    else
        __pos = __sz;
    const value_type* __p = data();
    for (const value_type* __ps = __p + __pos; __ps != __p;)
        if (!traits_type::eq(*--__ps, __c))
            return static_cast<size_type>(__ps - __p);
    return npos;
}

// compare

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
int
basic_string<_CharT, _Traits, _Allocator>::compare(const basic_string& __str) const _NOEXCEPT
{
    size_t __lhs_sz = size();
    size_t __rhs_sz = __str.size();
    int __result = traits_type::compare(data(), __str.data(),
                                        _VSTD::min(__lhs_sz, __rhs_sz));
    if (__result != 0)
        return __result;
    if (__lhs_sz < __rhs_sz)
        return -1;
    if (__lhs_sz > __rhs_sz)
        return 1;
    return 0;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const basic_string& __str) const
{
    return compare(__pos1, __n1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const basic_string& __str,
                                                   size_type __pos2,
                                                   size_type __n2) const
{
    size_type __sz = __str.size();
    if (__pos2 > __sz)
        this->__throw_out_of_range();
    return compare(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2,
                                                                  __sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(const value_type* __s) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return compare(0, npos, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const value_type* __s) const
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return compare(__pos1, __n1, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const value_type* __s,
                                                   size_type __n2) const
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos1 > __sz || __n2 == npos)
        this->__throw_out_of_range();
    size_type __rlen = _VSTD::min(__n1, __sz - __pos1);
    int __r = traits_type::compare(data() + __pos1, __s, _VSTD::min(__rlen, __n2));
    if (__r == 0)
    {
        if (__rlen < __n2)
            __r = -1;
        else if (__rlen > __n2)
            __r = 1;
    }
    return __r;
}

// __invariants

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
basic_string<_CharT, _Traits, _Allocator>::__invariants() const
{
    if (size() > capacity())
        return false;
    if (capacity() < __min_cap - 1)
        return false;
    if (data() == 0)
        return false;
    if (data()[size()] != value_type(0))
        return false;
    return true;
}

// operator==

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    size_t __lhs_sz = __lhs.size();
    return __lhs_sz == __rhs.size() && _Traits::compare(__lhs.data(),
                                                        __rhs.data(),
                                                        __lhs_sz) == 0;
}

template<class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<char, char_traits<char>, _Allocator>& __lhs,
           const basic_string<char, char_traits<char>, _Allocator>& __rhs) _NOEXCEPT
{
    size_t __lhs_sz = __lhs.size();
    if (__lhs_sz != __rhs.size())
        return false;
    const char* __lp = __lhs.data();
    const char* __rp = __rhs.data();
    if (__lhs.__is_long())
        return char_traits<char>::compare(__lp, __rp, __lhs_sz) == 0;
    for (; __lhs_sz != 0; --__lhs_sz, ++__lp, ++__rp)
        if (*__lp != *__rp)
            return false;
    return true;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs.compare(__lhs) == 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) == 0;
}

// operator!=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

// operator<

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs.compare(__lhs) > 0;
}

// operator>

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

// operator<=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

// operator>=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

// operator +

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
          const basic_string<_CharT, _Traits, _Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __lhs , const basic_string<_CharT,_Traits,_Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = _Traits::length(__lhs);
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(__lhs, __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(&__lhs, 1, 1 + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = _Traits::length(__rhs);
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs, __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, _CharT __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + 1);
    __r.push_back(__rhs);
    return __r;
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
{
    return _VSTD::move(__rhs.insert(0, __lhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __lhs , basic_string<_CharT,_Traits,_Allocator>&& __rhs)
{
    return _VSTD::move(__rhs.insert(0, __lhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __lhs, basic_string<_CharT,_Traits,_Allocator>&& __rhs)
{
    __rhs.insert(__rhs.begin(), __lhs);
    return _VSTD::move(__rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const _CharT* __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, _CharT __rhs)
{
    __lhs.push_back(__rhs);
    return _VSTD::move(__lhs);
}

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

// swap

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
swap(basic_string<_CharT, _Traits, _Allocator>& __lhs,
     basic_string<_CharT, _Traits, _Allocator>& __rhs)
     _NOEXCEPT_(_NOEXCEPT_(__lhs.swap(__rhs)))
{
    __lhs.swap(__rhs);
}

#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS

typedef basic_string<char16_t> u16string;
typedef basic_string<char32_t> u32string;

#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS

int                stoi  (const string& __str, size_t* __idx = 0, int __base = 10);
long               stol  (const string& __str, size_t* __idx = 0, int __base = 10);
unsigned long      stoul (const string& __str, size_t* __idx = 0, int __base = 10);
long long          stoll (const string& __str, size_t* __idx = 0, int __base = 10);
unsigned long long stoull(const string& __str, size_t* __idx = 0, int __base = 10);

float       stof (const string& __str, size_t* __idx = 0);
double      stod (const string& __str, size_t* __idx = 0);
long double stold(const string& __str, size_t* __idx = 0);

string to_string(int __val);
string to_string(unsigned __val);
string to_string(long __val);
string to_string(unsigned long __val);
string to_string(long long __val);
string to_string(unsigned long long __val);
string to_string(float __val);
string to_string(double __val);
string to_string(long double __val);

int                stoi  (const wstring& __str, size_t* __idx = 0, int __base = 10);
long               stol  (const wstring& __str, size_t* __idx = 0, int __base = 10);
unsigned long      stoul (const wstring& __str, size_t* __idx = 0, int __base = 10);
long long          stoll (const wstring& __str, size_t* __idx = 0, int __base = 10);
unsigned long long stoull(const wstring& __str, size_t* __idx = 0, int __base = 10);

float       stof (const wstring& __str, size_t* __idx = 0);
double      stod (const wstring& __str, size_t* __idx = 0);
long double stold(const wstring& __str, size_t* __idx = 0);

wstring to_wstring(int __val);
wstring to_wstring(unsigned __val);
wstring to_wstring(long __val);
wstring to_wstring(unsigned long __val);
wstring to_wstring(long long __val);
wstring to_wstring(unsigned long long __val);
wstring to_wstring(float __val);
wstring to_wstring(double __val);
wstring to_wstring(long double __val);

template<class _CharT, class _Traits, class _Allocator>
    const typename basic_string<_CharT, _Traits, _Allocator>::size_type
                   basic_string<_CharT, _Traits, _Allocator>::npos;

template<class _Ptr>
size_t _LIBCPP_INLINE_VISIBILITY __do_string_hash(_Ptr __p, _Ptr __e)
{
    typedef typename iterator_traits<_Ptr>::value_type value_type;
    return __murmur2_or_cityhash<size_t>()(__p, (__e-__p)*sizeof(value_type));
}

template<class _CharT, class _Traits, class _Allocator>
struct _LIBCPP_TYPE_VIS hash<basic_string<_CharT, _Traits, _Allocator> >
    : public unary_function<basic_string<_CharT, _Traits, _Allocator>, size_t>
{
    size_t
        operator()(const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT;
};

template<class _CharT, class _Traits, class _Allocator>
size_t
hash<basic_string<_CharT, _Traits, _Allocator> >::operator()(
        const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT
{
    return __do_string_hash(__val.data(), __val.data() + __val.size());
}

template<class _CharT, class _Traits, class _Allocator>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
           const basic_string<_CharT, _Traits, _Allocator>& __str);

template<class _CharT, class _Traits, class _Allocator>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is,
           basic_string<_CharT, _Traits, _Allocator>& __str);

template<class _CharT, class _Traits, class _Allocator>
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str);

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str);

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

_LIBCPP_EXTERN_TEMPLATE(class basic_string<char>)
_LIBCPP_EXTERN_TEMPLATE(class basic_string<wchar_t>)

extern template
    string
    operator+<char, char_traits<char>, allocator<char> >(char const*, string const&);

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_STRING
@


1.6
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/249998
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@d103 2
a104 2
    basic_string(const_pointer s, const allocator_type& a = allocator_type());
    basic_string(const_pointer s, size_type n, const allocator_type& a = allocator_type());
d120 1
a120 1
    basic_string& operator=(const_pointer s);
d159 1
a159 1
    basic_string& operator+=(const_pointer s);
d165 2
a166 2
    basic_string& append(const_pointer s, size_type n);
    basic_string& append(const_pointer s);
d182 2
a183 2
    basic_string& assign(const_pointer s, size_type n);
    basic_string& assign(const_pointer s);
d192 2
a193 2
    basic_string& insert(size_type pos, const_pointer s, size_type n);
    basic_string& insert(size_type pos, const_pointer s);
d208 2
a209 2
    basic_string& replace(size_type pos, size_type n1, const_pointer s, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const_pointer s);
d212 2
a213 2
    basic_string& replace(const_iterator i1, const_iterator i2, const_pointer s, size_type n);
    basic_string& replace(const_iterator i1, const_iterator i2, const_pointer s);
d219 1
a219 1
    size_type copy(pointer s, size_type n, size_type pos = 0) const;
d226 2
a227 2
    const_pointer c_str() const noexcept;
    const_pointer data() const noexcept;
d232 2
a233 2
    size_type find(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find(const_pointer s, size_type pos = 0) const noexcept;
d237 2
a238 2
    size_type rfind(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type rfind(const_pointer s, size_type pos = npos) const noexcept;
d242 2
a243 2
    size_type find_first_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_first_of(const_pointer s, size_type pos = 0) const noexcept;
d247 2
a248 2
    size_type find_last_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_last_of(const_pointer s, size_type pos = npos) const noexcept;
d252 2
a253 2
    size_type find_first_not_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_first_not_of(const_pointer s, size_type pos = 0) const noexcept;
d257 2
a258 2
    size_type find_last_not_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_last_not_of(const_pointer s, size_type pos = npos) const noexcept;
d265 3
a267 3
    int compare(const_pointer s) const noexcept;
    int compare(size_type pos1, size_type n1, const_pointer s) const;
    int compare(size_type pos1, size_type n1, const_pointer s, size_type n2) const;
d1039 15
d1087 33
a1134 2
    enum {__mask = size_type(~0) >> 1};

d1148 2
d1195 1
a1195 1
    _LIBCPP_INLINE_VISIBILITY basic_string(const_pointer __s);
d1197 1
a1197 1
    basic_string(const_pointer __s, const allocator_type& __a);
d1199 1
a1199 1
    basic_string(const_pointer __s, size_type __n);
d1201 1
a1201 1
    basic_string(const_pointer __s, size_type __n, const allocator_type& __a);
d1230 1
a1230 1
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const_pointer __s) {return assign(__s);}
d1243 1
a1243 1
        {return const_iterator(data());}
d1249 1
a1249 1
        {return const_iterator(data() + size());}
d1306 1
a1306 1
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const_pointer __s)         {return append(__s);}
d1315 2
a1316 2
    basic_string& append(const_pointer __s, size_type __n);
    basic_string& append(const_pointer __s);
d1354 2
a1355 2
    basic_string& assign(const_pointer __s, size_type __n);
    basic_string& assign(const_pointer __s);
d1380 2
a1381 2
    basic_string& insert(size_type __pos, const_pointer __s, size_type __n);
    basic_string& insert(size_type __pos, const_pointer __s);
d1416 2
a1417 2
    basic_string& replace(size_type __pos, size_type __n1, const_pointer __s, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const_pointer __s);
d1422 1
a1422 1
    basic_string& replace(const_iterator __i1, const_iterator __i2, const_pointer __s, size_type __n);
d1424 1
a1424 1
    basic_string& replace(const_iterator __i1, const_iterator __i2, const_pointer __s);
d1440 1
a1440 1
    size_type copy(pointer __s, size_type __n, size_type __pos = 0) const;
d1450 1
a1450 1
    const_pointer c_str() const _NOEXCEPT {return data();}
d1452 1
a1452 1
    const_pointer data() const _NOEXCEPT  {return __get_pointer();}
d1459 1
a1459 1
    size_type find(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1461 1
a1461 1
    size_type find(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
d1466 1
a1466 1
    size_type rfind(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1468 1
a1468 1
    size_type rfind(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
d1473 1
a1473 1
    size_type find_first_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1475 1
a1475 1
    size_type find_first_of(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
d1481 1
a1481 1
    size_type find_last_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1483 1
a1483 1
    size_type find_last_of(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
d1489 1
a1489 1
    size_type find_first_not_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1491 1
a1491 1
    size_type find_first_not_of(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
d1497 1
a1497 1
    size_type find_last_not_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1499 1
a1499 1
    size_type find_last_not_of(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
d1508 3
a1510 3
    int compare(const_pointer __s) const _NOEXCEPT;
    int compare(size_type __pos1, size_type __n1, const_pointer __s) const;
    int compare(size_type __pos1, size_type __n1, const_pointer __s, size_type __n2) const;
d1526 2
d1530 19
a1548 1
#if _LIBCPP_BIG_ENDIAN
d1550 1
a1550 1
#else
d1552 2
a1553 1
#endif
d1556 1
a1556 1
#if _LIBCPP_BIG_ENDIAN
d1558 1
a1558 1
#else
d1560 4
a1563 1
#endif
d1592 1
a1592 1
        {return __r_.first().__s.__data_;}
d1595 1
a1595 1
        {return __r_.first().__s.__data_;}
d1622 2
a1623 2
    void __init(const_pointer __s, size_type __sz, size_type __reserve);
    void __init(const_pointer __s, size_type __sz);
d1647 1
a1647 1
                               size_type __n_add, const_pointer __p_new_stuff);
d1804 1
a1804 1
basic_string<_CharT, _Traits, _Allocator>::__init(const_pointer __s, size_type __sz, size_type __reserve)
d1822 1
a1822 1
    traits_type::copy(__p, __s, __sz);
d1828 1
a1828 1
basic_string<_CharT, _Traits, _Allocator>::__init(const_pointer __s, size_type __sz)
d1846 1
a1846 1
    traits_type::copy(__p, __s, __sz);
d1852 1
a1852 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s)
d1862 1
a1862 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, const allocator_type& __a)
d1873 1
a1873 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, size_type __n)
d1883 1
a1883 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, size_type __n, const allocator_type& __a)
d1899 1
a1899 1
        __init(__str.__get_long_pointer(), __str.__get_long_size());
d1909 1
a1909 1
        __init(__str.__get_long_pointer(), __str.__get_long_size());
d1934 1
a1934 1
        __init(__str.__get_long_pointer(), __str.__get_long_size());
d1963 1
a1963 1
    traits_type::assign(__p, __n, __c);
d2101 1
a2101 1
     size_type __n_copy,  size_type __n_del,     size_type __n_add, const_pointer __p_new_stuff)
d2113 2
a2114 1
        traits_type::copy(__p, __old_p, __n_copy);
d2116 1
a2116 1
        traits_type::copy(__p + __n_copy, __p_new_stuff, __n_add);
d2119 2
a2120 1
        traits_type::copy(__p + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz);
d2145 2
a2146 1
        traits_type::copy(__p, __old_p, __n_copy);
d2149 3
a2151 1
        traits_type::copy(__p + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz);
d2162 1
a2162 1
basic_string<_CharT, _Traits, _Allocator>::assign(const_pointer __s, size_type __n)
d2170 1
a2170 1
        pointer __p = __get_pointer();
d2196 1
a2196 1
    pointer __p = __get_pointer();
d2338 1
a2338 1
basic_string<_CharT, _Traits, _Allocator>::assign(const_pointer __s)
d2350 1
a2350 1
basic_string<_CharT, _Traits, _Allocator>::append(const_pointer __s, size_type __n)
d2361 1
a2361 1
            pointer __p = __get_pointer();
d2384 1
a2384 1
        traits_type::assign(__p + __sz, __n, __c);
d2396 13
a2408 2
    size_type __cap = capacity();
    size_type __sz = size();
d2410 1
d2412 13
a2424 1
    pointer __p = __get_pointer() + __sz;
a2426 1
    __set_size(__sz+1);
d2489 1
a2489 1
basic_string<_CharT, _Traits, _Allocator>::append(const_pointer __s)
d2501 1
a2501 1
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const_pointer __s, size_type __n)
d2514 1
a2514 1
            pointer __p = __get_pointer();
d2543 1
a2543 1
        pointer __p;
d2546 1
a2546 1
            __p = __get_pointer();
d2554 1
a2554 1
            __p = __get_long_pointer();
d2598 1
a2598 1
        pointer __p;
d2601 1
a2601 1
            __p = __get_pointer();
d2609 1
a2609 1
            __p = __get_long_pointer();
d2641 1
a2641 1
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const_pointer __s)
d2656 1
a2656 1
    pointer __p;
d2660 1
a2660 1
        __p = __get_long_pointer();
d2664 1
a2664 1
        __p = __get_pointer();
d2689 1
a2689 1
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const_pointer __s, size_type __n2)
d2701 1
a2701 1
        pointer __p = __get_pointer();
d2750 1
a2750 1
    pointer __p;
d2753 1
a2753 1
        __p = __get_pointer();
d2764 1
a2764 1
        __p = __get_long_pointer();
d2823 1
a2823 1
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const_pointer __s)
d2843 1
a2843 1
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const_pointer __s, size_type __n)
d2851 1
a2851 1
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const_pointer __s)
d2875 1
a2875 1
        pointer __p = __get_pointer();
d3033 1
a3033 1
                if (__new_data == 0)
d3041 2
a3042 1
        traits_type::copy(__new_data, __p, size()+1);
d3143 1
a3143 1
basic_string<_CharT, _Traits, _Allocator>::copy(pointer __s, size_type __n, size_type __pos) const
d3189 1
a3189 1
basic_string<_CharT, _Traits, _Allocator>::find(const_pointer __s,
d3201 2
a3202 2
    const_pointer __p = data();
    const_pointer __r = _VSTD::search(__p + __pos, __p + __sz, __s, __s + __n,
d3221 1
a3221 1
basic_string<_CharT, _Traits, _Allocator>::find(const_pointer __s,
d3238 2
a3239 2
    const_pointer __p = data();
    const_pointer __r = traits_type::find(__p + __pos, __sz - __pos, __c);
d3249 1
a3249 1
basic_string<_CharT, _Traits, _Allocator>::rfind(const_pointer __s,
d3262 2
a3263 2
    const_pointer __p = data();
    const_pointer __r = _VSTD::find_end(__p, __p + __pos, __s, __s + __n,
d3282 1
a3282 1
basic_string<_CharT, _Traits, _Allocator>::rfind(const_pointer __s,
d3303 2
a3304 2
        const_pointer __p = data();
        for (const_pointer __ps = __p + __pos; __ps != __p;)
d3317 1
a3317 1
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const_pointer __s,
d3327 2
a3328 2
    const_pointer __p = data();
    const_pointer __r = _VSTD::find_first_of(__p + __pos, __p + __sz, __s,
d3347 1
a3347 1
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const_pointer __s,
d3369 1
a3369 1
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const_pointer __s,
d3383 2
a3384 2
        const_pointer __p = data();
        for (const_pointer __ps = __p + __pos; __ps != __p;)
d3386 1
a3386 1
            const_pointer __r = traits_type::find(__s, __n, *--__ps);
d3406 1
a3406 1
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const_pointer __s,
d3428 1
a3428 1
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const_pointer __s,
d3438 3
a3440 3
        const_pointer __p = data();
        const_pointer __pe = __p + __sz;
        for (const_pointer __ps = __p + __pos; __ps != __pe; ++__ps)
d3459 1
a3459 1
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const_pointer __s,
d3477 3
a3479 3
        const_pointer __p = data();
        const_pointer __pe = __p + __sz;
        for (const_pointer __ps = __p + __pos; __ps != __pe; ++__ps)
d3490 1
a3490 1
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const_pointer __s,
d3502 2
a3503 2
    const_pointer __p = data();
    for (const_pointer __ps = __p + __pos; __ps != __p;)
d3521 1
a3521 1
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const_pointer __s,
d3541 2
a3542 2
    const_pointer __p = data();
    for (const_pointer __ps = __p + __pos; __ps != __p;)
d3595 1
a3595 1
basic_string<_CharT, _Traits, _Allocator>::compare(const_pointer __s) const _NOEXCEPT
d3607 1
a3607 1
                                                   const_pointer __s) const
d3619 1
a3619 1
                                                   const_pointer __s,
@


1.5
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/246487
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@d460 1
a460 1
class _LIBCPP_VISIBLE fpos
d497 1
a497 1
struct _LIBCPP_VISIBLE char_traits
d623 1
a623 1
struct _LIBCPP_VISIBLE char_traits<char>
d679 1
a679 1
struct _LIBCPP_VISIBLE char_traits<wchar_t>
d736 1
a736 1
struct _LIBCPP_VISIBLE char_traits<char16_t>
d856 1
a856 1
struct _LIBCPP_VISIBLE char_traits<char32_t>
d1040 1
a1040 1
class _LIBCPP_VISIBLE basic_string
d1465 5
a1478 4
    bool __is_long() const _NOEXCEPT
        {return bool(__r_.first().__s.__size_ & __short_mask);}

    _LIBCPP_INLINE_VISIBILITY
d3565 23
a3587 3
    return __lhs.size() == __rhs.size() && _Traits::compare(__lhs.data(),
                                                            __rhs.data(),
                                                            __lhs.size()) == 0;
d3947 1
a3947 1
struct _LIBCPP_VISIBLE hash<basic_string<_CharT, _Traits, _Allocator> >
@


1.4
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/242945
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242945 | theraven | 2012-11-13 03:27:43 +0000 (Tue, 13 Nov 2012) | 2 lines
## SVN ##
## SVN ## Import new version of libc++ into base.
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d3377 1
a3377 1
        for (const_pointer __ps = __p + __pos; __p != __pe; ++__ps)
@


1.3
log
@SVN rev 241903 on 2012-10-22 18:25:04Z by dim

Import libc++ trunk r165949.  Among other improvements and bug fixes,
this has many visibility problems fixed, which should help with
compiling certain ports that exercise C++11 mode (i.e. Firefox).

Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
which are referred to in all the source files.

MFC after:	1 month
@
text
@d1034 1
a1034 1
extern template class __basic_string_common<true>;
d1097 1
a1097 1
            value_type _;
d1102 1
a1102 1
    union _{__long _; __short __;};
d1104 1
a1104 1
    enum {__n_words = sizeof(_) / sizeof(size_type)};
d3978 2
a3979 2
extern template class basic_string<char>;
extern template class basic_string<wchar_t>;
@


1.2
log
@SVN rev 232950 on 2012-03-14 00:09:36Z by theraven

Import new versions of libcxxrt and libc++.
Please tests any C++ code you care about with -stdlib=libc++!

Approved by:	dim (mentor)
@
text
@d54 2
a55 2
    static bool eq(char_type c1, char_type c2) noexcept;
    static bool lt(char_type c1, char_type c2) noexcept;
d64 5
a68 5
    static int_type  not_eof(int_type c) noexcept;
    static char_type to_char_type(int_type c) noexcept;
    static int_type  to_int_type(char_type c) noexcept;
    static bool      eq_int_type(int_type c1, int_type c2) noexcept;
    static int_type  eof() noexcept;
d509 1
a509 1
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d512 1
a512 1
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d522 2
a523 1
    _LIBCPP_INLINE_VISIBILITY static int_type  not_eof(int_type __c) _NOEXCEPT
d526 1
a526 1
    static char_type to_char_type(int_type __c) _NOEXCEPT
d529 1
a529 1
    static int_type  to_int_type(char_type __c) _NOEXCEPT
d532 1
a532 1
    static bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d535 1
a535 1
    static int_type  eof() _NOEXCEPT
d635 1
a635 1
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d638 1
a638 1
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d659 2
a660 1
    _LIBCPP_INLINE_VISIBILITY static int_type  not_eof(int_type __c) _NOEXCEPT
d663 1
a663 1
    static char_type to_char_type(int_type __c) _NOEXCEPT
d666 1
a666 1
    static int_type to_int_type(char_type __c) _NOEXCEPT
d669 1
a669 1
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d672 1
a672 1
    static int_type  eof() _NOEXCEPT
d691 1
a691 1
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d694 1
a694 1
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d717 1
a717 1
    static int_type  not_eof(int_type __c) _NOEXCEPT
d720 1
a720 1
    static char_type to_char_type(int_type __c) _NOEXCEPT
d723 1
a723 1
    static int_type to_int_type(char_type __c) _NOEXCEPT
d726 1
a726 1
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d729 1
a729 1
    static int_type eof() _NOEXCEPT
d748 1
a748 1
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d751 1
a751 1
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d762 1
a762 1
    static int_type  not_eof(int_type __c) _NOEXCEPT
d765 1
a765 1
    static char_type to_char_type(int_type __c) _NOEXCEPT
d768 1
a768 1
    static int_type to_int_type(char_type __c) _NOEXCEPT
d771 1
a771 1
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d774 1
a774 1
    static int_type eof() _NOEXCEPT
d868 1
a868 1
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d871 1
a871 1
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d882 1
a882 1
    static int_type  not_eof(int_type __c) _NOEXCEPT
d885 1
a885 1
    static char_type to_char_type(int_type __c) _NOEXCEPT
d888 1
a888 1
    static int_type to_int_type(char_type __c) _NOEXCEPT
d891 1
a891 1
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d894 1
a894 1
    static int_type eof() _NOEXCEPT
d2211 1
@


1.2.2.1
log
@file string was added on branch RELENG_9 on 2012-05-22 18:32:26 +0000
@
text
@d1 3984
@


1.2.2.2
log
@SVN rev 235798 on 2012-05-22 18:30:14Z by theraven

Merged libcxxrt and libc++.  Now available for testing on 9-stable with
-stdlib=libc++.  Changes to libstdc++ not yet merged, so it is not yet possible
to mix libstdc++ and libc++ in the same program.

Merged revisions: 226702,226785,227006,227755,227983,227987,228531,228630,228761,229067,230127,232950,233098,234715-234716,234772
@
text
@a0 3984
// -*- C++ -*-
//===--------------------------- string -----------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_STRING
#define _LIBCPP_STRING

/*
    string synopsis

namespace std
{

template <class stateT>
class fpos
{
private:
    stateT st;
public:
    fpos(streamoff = streamoff());

    operator streamoff() const;

    stateT state() const;
    void state(stateT);

    fpos& operator+=(streamoff);
    fpos  operator+ (streamoff) const;
    fpos& operator-=(streamoff);
    fpos  operator- (streamoff) const;
};

template <class stateT> streamoff operator-(const fpos<stateT>& x, const fpos<stateT>& y);

template <class stateT> bool operator==(const fpos<stateT>& x, const fpos<stateT>& y);
template <class stateT> bool operator!=(const fpos<stateT>& x, const fpos<stateT>& y);

template <class charT>
struct char_traits
{
    typedef charT     char_type;
    typedef ...       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    static void assign(char_type& c1, const char_type& c2) noexcept;
    static bool eq(char_type c1, char_type c2) noexcept;
    static bool lt(char_type c1, char_type c2) noexcept;

    static int              compare(const char_type* s1, const char_type* s2, size_t n);
    static size_t           length(const char_type* s);
    static const char_type* find(const char_type* s, size_t n, const char_type& a);
    static char_type*       move(char_type* s1, const char_type* s2, size_t n);
    static char_type*       copy(char_type* s1, const char_type* s2, size_t n);
    static char_type*       assign(char_type* s, size_t n, char_type a);

    static int_type  not_eof(int_type c) noexcept;
    static char_type to_char_type(int_type c) noexcept;
    static int_type  to_int_type(char_type c) noexcept;
    static bool      eq_int_type(int_type c1, int_type c2) noexcept;
    static int_type  eof() noexcept;
};

template <> struct char_traits<char>;
template <> struct char_traits<wchar_t>;

template<class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
class basic_string
{
public:
// types:
    typedef traits traits_type;
    typedef typename traits_type::char_type value_type;
    typedef Allocator allocator_type;
    typedef typename allocator_type::size_type size_type;
    typedef typename allocator_type::difference_type difference_type;
    typedef typename allocator_type::reference reference;
    typedef typename allocator_type::const_reference const_reference;
    typedef typename allocator_type::pointer pointer;
    typedef typename allocator_type::const_pointer const_pointer;
    typedef implementation-defined iterator;
    typedef implementation-defined const_iterator;
    typedef std::reverse_iterator<iterator> reverse_iterator;
    typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

    static const size_type npos = -1;

    basic_string()
        noexcept(is_nothrow_default_constructible<allocator_type>::value);
    explicit basic_string(const allocator_type& a);
    basic_string(const basic_string& str);
    basic_string(basic_string&& str)
        noexcept(is_nothrow_move_constructible<allocator_type>::value);
    basic_string(const basic_string& str, size_type pos, size_type n = npos,
                 const allocator_type& a = allocator_type());
    basic_string(const_pointer s, const allocator_type& a = allocator_type());
    basic_string(const_pointer s, size_type n, const allocator_type& a = allocator_type());
    basic_string(size_type n, value_type c, const allocator_type& a = allocator_type());
    template<class InputIterator>
        basic_string(InputIterator begin, InputIterator end,
                     const allocator_type& a = allocator_type());
    basic_string(initializer_list<value_type>, const Allocator& = Allocator());
    basic_string(const basic_string&, const Allocator&);
    basic_string(basic_string&&, const Allocator&);

    ~basic_string();

    basic_string& operator=(const basic_string& str);
    basic_string& operator=(basic_string&& str)
        noexcept(
             allocator_type::propagate_on_container_move_assignment::value &&
             is_nothrow_move_assignable<allocator_type>::value);
    basic_string& operator=(const_pointer s);
    basic_string& operator=(value_type c);
    basic_string& operator=(initializer_list<value_type>);

    iterator       begin() noexcept;
    const_iterator begin() const noexcept;
    iterator       end() noexcept;
    const_iterator end() const noexcept;

    reverse_iterator       rbegin() noexcept;
    const_reverse_iterator rbegin() const noexcept;
    reverse_iterator       rend() noexcept;
    const_reverse_iterator rend() const noexcept;

    const_iterator         cbegin() const noexcept;
    const_iterator         cend() const noexcept;
    const_reverse_iterator crbegin() const noexcept;
    const_reverse_iterator crend() const noexcept;

    size_type size() const noexcept;
    size_type length() const noexcept;
    size_type max_size() const noexcept;
    size_type capacity() const noexcept;

    void resize(size_type n, value_type c);
    void resize(size_type n);

    void reserve(size_type res_arg = 0);
    void shrink_to_fit();
    void clear() noexcept;
    bool empty() const noexcept;

    const_reference operator[](size_type pos) const;
    reference       operator[](size_type pos);

    const_reference at(size_type n) const;
    reference       at(size_type n);

    basic_string& operator+=(const basic_string& str);
    basic_string& operator+=(const_pointer s);
    basic_string& operator+=(value_type c);
    basic_string& operator+=(initializer_list<value_type>);

    basic_string& append(const basic_string& str);
    basic_string& append(const basic_string& str, size_type pos, size_type n);
    basic_string& append(const_pointer s, size_type n);
    basic_string& append(const_pointer s);
    basic_string& append(size_type n, value_type c);
    template<class InputIterator>
        basic_string& append(InputIterator first, InputIterator last);
    basic_string& append(initializer_list<value_type>);

    void push_back(value_type c);
    void pop_back();
    reference       front();
    const_reference front() const;
    reference       back();
    const_reference back() const;

    basic_string& assign(const basic_string& str);
    basic_string& assign(basic_string&& str);
    basic_string& assign(const basic_string& str, size_type pos, size_type n);
    basic_string& assign(const_pointer s, size_type n);
    basic_string& assign(const_pointer s);
    basic_string& assign(size_type n, value_type c);
    template<class InputIterator>
        basic_string& assign(InputIterator first, InputIterator last);
    basic_string& assign(initializer_list<value_type>);

    basic_string& insert(size_type pos1, const basic_string& str);
    basic_string& insert(size_type pos1, const basic_string& str,
                         size_type pos2, size_type n);
    basic_string& insert(size_type pos, const_pointer s, size_type n);
    basic_string& insert(size_type pos, const_pointer s);
    basic_string& insert(size_type pos, size_type n, value_type c);
    iterator      insert(const_iterator p, value_type c);
    iterator      insert(const_iterator p, size_type n, value_type c);
    template<class InputIterator>
        iterator insert(const_iterator p, InputIterator first, InputIterator last);
    iterator      insert(const_iterator p, initializer_list<value_type>);

    basic_string& erase(size_type pos = 0, size_type n = npos);
    iterator      erase(const_iterator position);
    iterator      erase(const_iterator first, const_iterator last);

    basic_string& replace(size_type pos1, size_type n1, const basic_string& str);
    basic_string& replace(size_type pos1, size_type n1, const basic_string& str,
                          size_type pos2, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const_pointer s, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const_pointer s);
    basic_string& replace(size_type pos, size_type n1, size_type n2, value_type c);
    basic_string& replace(const_iterator i1, const_iterator i2, const basic_string& str);
    basic_string& replace(const_iterator i1, const_iterator i2, const_pointer s, size_type n);
    basic_string& replace(const_iterator i1, const_iterator i2, const_pointer s);
    basic_string& replace(const_iterator i1, const_iterator i2, size_type n, value_type c);
    template<class InputIterator>
        basic_string& replace(const_iterator i1, const_iterator i2, InputIterator j1, InputIterator j2);
    basic_string& replace(const_iterator i1, const_iterator i2, initializer_list<value_type>);

    size_type copy(pointer s, size_type n, size_type pos = 0) const;
    basic_string substr(size_type pos = 0, size_type n = npos) const;

    void swap(basic_string& str)
        noexcept(!allocator_type::propagate_on_container_swap::value ||
                 __is_nothrow_swappable<allocator_type>::value)

    const_pointer c_str() const noexcept;
    const_pointer data() const noexcept;

    allocator_type get_allocator() const noexcept;

    size_type find(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find(const_pointer s, size_type pos = 0) const noexcept;
    size_type find(value_type c, size_type pos = 0) const noexcept;

    size_type rfind(const basic_string& str, size_type pos = npos) const noexcept;
    size_type rfind(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type rfind(const_pointer s, size_type pos = npos) const noexcept;
    size_type rfind(value_type c, size_type pos = npos) const noexcept;

    size_type find_first_of(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find_first_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_first_of(const_pointer s, size_type pos = 0) const noexcept;
    size_type find_first_of(value_type c, size_type pos = 0) const noexcept;

    size_type find_last_of(const basic_string& str, size_type pos = npos) const noexcept;
    size_type find_last_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_last_of(const_pointer s, size_type pos = npos) const noexcept;
    size_type find_last_of(value_type c, size_type pos = npos) const noexcept;

    size_type find_first_not_of(const basic_string& str, size_type pos = 0) const noexcept;
    size_type find_first_not_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_first_not_of(const_pointer s, size_type pos = 0) const noexcept;
    size_type find_first_not_of(value_type c, size_type pos = 0) const noexcept;

    size_type find_last_not_of(const basic_string& str, size_type pos = npos) const noexcept;
    size_type find_last_not_of(const_pointer s, size_type pos, size_type n) const noexcept;
    size_type find_last_not_of(const_pointer s, size_type pos = npos) const noexcept;
    size_type find_last_not_of(value_type c, size_type pos = npos) const noexcept;

    int compare(const basic_string& str) const noexcept;
    int compare(size_type pos1, size_type n1, const basic_string& str) const;
    int compare(size_type pos1, size_type n1, const basic_string& str,
                size_type pos2, size_type n2) const;
    int compare(const_pointer s) const noexcept;
    int compare(size_type pos1, size_type n1, const_pointer s) const;
    int compare(size_type pos1, size_type n1, const_pointer s, size_type n2) const;

    bool __invariants() const;
};

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs,
          const basic_string<charT, traits, Allocator>& rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const charT* lhs , const basic_string<charT,traits,Allocator>&rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);

template<class charT, class traits, class Allocator>
basic_string<charT, traits, Allocator>
operator+(const basic_string<charT, traits, Allocator>& lhs, charT rhs);

template<class charT, class traits, class Allocator>
bool operator==(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator==(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator==(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const basic_string<charT,traits,Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator< (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator> (const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator<=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const basic_string<charT, traits, Allocator>& lhs,
                const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs) noexcept;

template<class charT, class traits, class Allocator>
bool operator>=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;

template<class charT, class traits, class Allocator>
void swap(basic_string<charT, traits, Allocator>& lhs,
          basic_string<charT, traits, Allocator>& rhs)
            noexcept(noexcept(lhs.swap(rhs)));

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
operator>>(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);

template<class charT, class traits, class Allocator>
basic_ostream<charT, traits>&
operator<<(basic_ostream<charT, traits>& os, const basic_string<charT, traits, Allocator>& str);

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str,
        charT delim);

template<class charT, class traits, class Allocator>
basic_istream<charT, traits>&
getline(basic_istream<charT, traits>& is, basic_string<charT, traits, Allocator>& str);

typedef basic_string<char>    string;
typedef basic_string<wchar_t> wstring;
typedef basic_string<char16_t> u16string;
typedef basic_string<char32_t> u32string;

int                stoi  (const string& str, size_t* idx = 0, int base = 10);
long               stol  (const string& str, size_t* idx = 0, int base = 10);
unsigned long      stoul (const string& str, size_t* idx = 0, int base = 10);
long long          stoll (const string& str, size_t* idx = 0, int base = 10);
unsigned long long stoull(const string& str, size_t* idx = 0, int base = 10);

float       stof (const string& str, size_t* idx = 0);
double      stod (const string& str, size_t* idx = 0);
long double stold(const string& str, size_t* idx = 0);

string to_string(int val);
string to_string(unsigned val);
string to_string(long val);
string to_string(unsigned long val);
string to_string(long long val);
string to_string(unsigned long long val);
string to_string(float val);
string to_string(double val);
string to_string(long double val);

int                stoi  (const wstring& str, size_t* idx = 0, int base = 10);
long               stol  (const wstring& str, size_t* idx = 0, int base = 10);
unsigned long      stoul (const wstring& str, size_t* idx = 0, int base = 10);
long long          stoll (const wstring& str, size_t* idx = 0, int base = 10);
unsigned long long stoull(const wstring& str, size_t* idx = 0, int base = 10);

float       stof (const wstring& str, size_t* idx = 0);
double      stod (const wstring& str, size_t* idx = 0);
long double stold(const wstring& str, size_t* idx = 0);

wstring to_wstring(int val);
wstring to_wstring(unsigned val);
wstring to_wstring(long val);
wstring to_wstring(unsigned long val);
wstring to_wstring(long long val);
wstring to_wstring(unsigned long long val);
wstring to_wstring(float val);
wstring to_wstring(double val);
wstring to_wstring(long double val);

template <> struct hash<string>;
template <> struct hash<u16string>;
template <> struct hash<u32string>;
template <> struct hash<wstring>;

}  // std

*/

#include <__config>
#include <iosfwd>
#include <cstring>
#include <cstdio>  // For EOF.
#include <cwchar>
#include <algorithm>
#include <iterator>
#include <utility>
#include <memory>
#include <stdexcept>
#include <type_traits>
#include <initializer_list>
#include <__functional_base>
#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
#include <cstdint>
#endif
#if defined(_LIBCPP_NO_EXCEPTIONS) || defined(_LIBCPP_DEBUG)
#include <cassert>
#endif

#include <__undef_min_max>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

// fpos

template <class _StateT>
class _LIBCPP_VISIBLE fpos
{
private:
    _StateT __st_;
    streamoff __off_;
public:
    _LIBCPP_INLINE_VISIBILITY fpos(streamoff __off = streamoff()) : __st_(), __off_(__off) {}

    _LIBCPP_INLINE_VISIBILITY operator streamoff() const {return __off_;}

    _LIBCPP_INLINE_VISIBILITY _StateT state() const {return __st_;}
    _LIBCPP_INLINE_VISIBILITY void state(_StateT __st) {__st_ = __st;}

    _LIBCPP_INLINE_VISIBILITY fpos& operator+=(streamoff __off) {__off_ += __off; return *this;}
    _LIBCPP_INLINE_VISIBILITY fpos  operator+ (streamoff __off) const {fpos __t(*this); __t += __off; return __t;}
    _LIBCPP_INLINE_VISIBILITY fpos& operator-=(streamoff __off) {__off_ -= __off; return *this;}
    _LIBCPP_INLINE_VISIBILITY fpos  operator- (streamoff __off) const {fpos __t(*this); __t -= __off; return __t;}
};

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
streamoff operator-(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) - streamoff(__y);}

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
bool operator==(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) == streamoff(__y);}

template <class _StateT>
inline _LIBCPP_INLINE_VISIBILITY
bool operator!=(const fpos<_StateT>& __x, const fpos<_StateT>& __y)
    {return streamoff(__x) != streamoff(__y);}

// char_traits

template <class _CharT>
struct _LIBCPP_VISIBLE char_traits
{
    typedef _CharT    char_type;
    typedef int       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY static int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static int_type  to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static int_type  eof() _NOEXCEPT
        {return int_type(EOF);}
};

template <class _CharT>
int
char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<_CharT>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
const _CharT*
char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

template <class _CharT>
_CharT*
char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
_CharT*
char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

template <class _CharT>
inline _LIBCPP_INLINE_VISIBILITY
_CharT*
char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

// char_traits<char>

template <>
struct _LIBCPP_VISIBLE char_traits<char>
{
    typedef char      char_type;
    typedef int       int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
            {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return (unsigned char)__c1 < (unsigned char)__c2;}

    _LIBCPP_INLINE_VISIBILITY
    static int compare(const char_type* __s1, const char_type* __s2, size_t __n)
        {return memcmp(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static size_t length(const char_type* __s) {return strlen(__s);}
    _LIBCPP_INLINE_VISIBILITY
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
        {return (const char_type*)memchr(__s, to_int_type(__a), __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)memmove(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)memcpy(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* assign(char_type* __s, size_t __n, char_type __a)
        {return (char_type*)memset(__s, to_int_type(__a), __n);}

    _LIBCPP_INLINE_VISIBILITY static int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type((unsigned char)__c);}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static int_type  eof() _NOEXCEPT
        {return int_type(EOF);}
};

// char_traits<wchar_t>

template <>
struct _LIBCPP_VISIBLE char_traits<wchar_t>
{
    typedef wchar_t   char_type;
    typedef wint_t    int_type;
    typedef streamoff off_type;
    typedef streampos pos_type;
    typedef mbstate_t state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    _LIBCPP_INLINE_VISIBILITY
    static int compare(const char_type* __s1, const char_type* __s2, size_t __n)
        {return wmemcmp(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static size_t length(const char_type* __s)
        {return wcslen(__s);}
    _LIBCPP_INLINE_VISIBILITY
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
        {return (const char_type*)wmemchr(__s, __a, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)wmemmove(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
        {return (char_type*)wmemcpy(__s1, __s2, __n);}
    _LIBCPP_INLINE_VISIBILITY
    static char_type* assign(char_type* __s, size_t __n, char_type __a)
        {return (char_type*)wmemset(__s, __a, __n);}

    _LIBCPP_INLINE_VISIBILITY
    static int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static int_type eof() _NOEXCEPT
        {return int_type(WEOF);}
};

#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS

template <>
struct _LIBCPP_VISIBLE char_traits<char16_t>
{
    typedef char16_t       char_type;
    typedef uint_least16_t int_type;
    typedef streamoff      off_type;
    typedef u16streampos   pos_type;
    typedef mbstate_t      state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY
    static int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static int_type eof() _NOEXCEPT
        {return int_type(0xDFFF);}
};

inline _LIBCPP_INLINE_VISIBILITY
int
char_traits<char16_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<char16_t>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

inline _LIBCPP_INLINE_VISIBILITY
const char16_t*
char_traits<char16_t>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char16_t*
char_traits<char16_t>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

template <>
struct _LIBCPP_VISIBLE char_traits<char32_t>
{
    typedef char32_t       char_type;
    typedef uint_least32_t int_type;
    typedef streamoff      off_type;
    typedef u32streampos   pos_type;
    typedef mbstate_t      state_type;

    _LIBCPP_INLINE_VISIBILITY
    static void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
        {__c1 = __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static bool lt(char_type __c1, char_type __c2) _NOEXCEPT
        {return __c1 < __c2;}

    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
    static size_t           length(const char_type* __s);
    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
    static char_type*       assign(char_type* __s, size_t __n, char_type __a);

    _LIBCPP_INLINE_VISIBILITY
    static int_type  not_eof(int_type __c) _NOEXCEPT
        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
    _LIBCPP_INLINE_VISIBILITY
    static char_type to_char_type(int_type __c) _NOEXCEPT
        {return char_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static int_type to_int_type(char_type __c) _NOEXCEPT
        {return int_type(__c);}
    _LIBCPP_INLINE_VISIBILITY
    static bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
        {return __c1 == __c2;}
    _LIBCPP_INLINE_VISIBILITY
    static int_type eof() _NOEXCEPT
        {return int_type(0xFFFFFFFF);}
};

inline _LIBCPP_INLINE_VISIBILITY
int
char_traits<char32_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
{
    for (; __n; --__n, ++__s1, ++__s2)
    {
        if (lt(*__s1, *__s2))
            return -1;
        if (lt(*__s2, *__s1))
            return 1;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
size_t
char_traits<char32_t>::length(const char_type* __s)
{
    size_t __len = 0;
    for (; !eq(*__s, char_type(0)); ++__s)
        ++__len;
    return __len;
}

inline _LIBCPP_INLINE_VISIBILITY
const char32_t*
char_traits<char32_t>::find(const char_type* __s, size_t __n, const char_type& __a)
{
    for (; __n; --__n)
    {
        if (eq(*__s, __a))
            return __s;
        ++__s;
    }
    return 0;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    if (__s1 < __s2)
    {
        for (; __n; --__n, ++__s1, ++__s2)
            assign(*__s1, *__s2);
    }
    else if (__s2 < __s1)
    {
        __s1 += __n;
        __s2 += __n;
        for (; __n; --__n)
            assign(*--__s1, *--__s2);
    }
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
{
    char_type* __r = __s1;
    for (; __n; --__n, ++__s1, ++__s2)
        assign(*__s1, *__s2);
    return __r;
}

inline _LIBCPP_INLINE_VISIBILITY
char32_t*
char_traits<char32_t>::assign(char_type* __s, size_t __n, char_type __a)
{
    char_type* __r = __s;
    for (; __n; --__n, ++__s)
        assign(*__s, __a);
    return __r;
}

#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS

// basic_string

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x,
          const basic_string<_CharT, _Traits, _Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __x, const basic_string<_CharT,_Traits,_Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __x, const basic_string<_CharT,_Traits,_Allocator>& __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, const _CharT* __y);

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __x, _CharT __y);

template <bool>
class __basic_string_common
{
protected:
    void __throw_length_error() const;
    void __throw_out_of_range() const;
};

template <bool __b>
void
__basic_string_common<__b>::__throw_length_error() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    throw length_error("basic_string");
#else
    assert(!"basic_string length_error");
#endif
}

template <bool __b>
void
__basic_string_common<__b>::__throw_out_of_range() const
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    throw out_of_range("basic_string");
#else
    assert(!"basic_string out_of_range");
#endif
}

#ifdef _MSC_VER
#pragma warning( push )
#pragma warning( disable: 4231 )
#endif // _MSC_VER
extern template class __basic_string_common<true>;
#ifdef _MSC_VER
#pragma warning( pop )
#endif // _MSC_VER

template<class _CharT, class _Traits, class _Allocator>
class _LIBCPP_VISIBLE basic_string
    : private __basic_string_common<true>
{
public:
    typedef basic_string                                 __self;
    typedef _Traits                                      traits_type;
    typedef typename traits_type::char_type              value_type;
    typedef _Allocator                                   allocator_type;
    typedef allocator_traits<allocator_type>             __alloc_traits;
    typedef typename __alloc_traits::size_type           size_type;
    typedef typename __alloc_traits::difference_type     difference_type;
    typedef value_type&                                  reference;
    typedef const value_type&                            const_reference;
    typedef typename __alloc_traits::pointer             pointer;
    typedef typename __alloc_traits::const_pointer       const_pointer;
#ifdef _LIBCPP_DEBUG
    typedef __debug_iter<basic_string, pointer>          iterator;
    typedef __debug_iter<basic_string, const_pointer>    const_iterator;

    friend class __debug_iter<basic_string, pointer>;
    friend class __debug_iter<basic_string, const_pointer>;
#elif defined(_LIBCPP_RAW_ITERATORS)
    typedef pointer                                      iterator;
    typedef const_pointer                                const_iterator;
#else  // defined(_LIBCPP_RAW_ITERATORS)
    typedef __wrap_iter<pointer>                         iterator;
    typedef __wrap_iter<const_pointer>                   const_iterator;
#endif  // defined(_LIBCPP_RAW_ITERATORS)
    typedef _VSTD::reverse_iterator<iterator>             reverse_iterator;
    typedef _VSTD::reverse_iterator<const_iterator>       const_reverse_iterator;

private:
    struct __long
    {
        size_type __cap_;
        size_type __size_;
        pointer   __data_;
    };

#if _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x80};
    enum {__long_mask  = ~(size_type(~0) >> 1)};
#else  // _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x01};
    enum {__long_mask  = 0x1ul};
#endif  // _LIBCPP_BIG_ENDIAN

    enum {__mask = size_type(~0) >> 1};

    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};

    struct __short
    {
        union
        {
            unsigned char __size_;
            value_type _;
        };
        value_type __data_[__min_cap];
    };

    union _{__long _; __short __;};

    enum {__n_words = sizeof(_) / sizeof(size_type)};

    struct __raw
    {
        size_type __words[__n_words];
    };

    struct __rep
    {
        union
        {
            __long  __l;
            __short __s;
            __raw   __r;
        };
    };

    __compressed_pair<__rep, allocator_type> __r_;

#ifdef _LIBCPP_DEBUG

    pair<iterator*, const_iterator*> __iterator_list_;

    _LIBCPP_INLINE_VISIBILITY iterator*&       __get_iterator_list(iterator*)       {return __iterator_list_.first;}
    _LIBCPP_INLINE_VISIBILITY const_iterator*& __get_iterator_list(const_iterator*) {return __iterator_list_.second;}

#endif  // _LIBCPP_DEBUG

public:
    static const size_type npos = -1;

    _LIBCPP_INLINE_VISIBILITY basic_string()
        _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
    _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a);
    basic_string(const basic_string& __str);
    basic_string(const basic_string& __str, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string(basic_string&& __str)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(basic_string&& __str, const allocator_type& __a);
#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY basic_string(const_pointer __s);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const_pointer __s, const allocator_type& __a);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const_pointer __s, size_type __n);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(const_pointer __s, size_type __n, const allocator_type& __a);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(size_type __n, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(size_type __n, value_type __c, const allocator_type& __a);
    basic_string(const basic_string& __str, size_type __pos, size_type __n = npos,
                 const allocator_type& __a = allocator_type());
    template<class _InputIterator>
        _LIBCPP_INLINE_VISIBILITY
        basic_string(_InputIterator __first, _InputIterator __last);
    template<class _InputIterator>
        _LIBCPP_INLINE_VISIBILITY
        basic_string(_InputIterator __first, _InputIterator __last, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string(initializer_list<value_type> __il);
    _LIBCPP_INLINE_VISIBILITY
    basic_string(initializer_list<value_type> __il, const allocator_type& __a);
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    ~basic_string();

    basic_string& operator=(const basic_string& __str);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string& operator=(basic_string&& __str)
        _NOEXCEPT_(__alloc_traits::propagate_on_container_move_assignment::value &&
                   is_nothrow_move_assignable<allocator_type>::value);
#endif
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const_pointer __s) {return assign(__s);}
    basic_string& operator=(value_type __c);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& operator=(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifndef _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY
    iterator begin() _NOEXCEPT
        {return iterator(__get_pointer());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator begin() const _NOEXCEPT
        {return const_iterator(data());}
    _LIBCPP_INLINE_VISIBILITY
    iterator end() _NOEXCEPT
        {return iterator(__get_pointer() + size());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator end() const _NOEXCEPT
        {return const_iterator(data() + size());}
#else  // _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY iterator       begin()       {return iterator(this, __get_pointer());}
    _LIBCPP_INLINE_VISIBILITY const_iterator begin() const {return const_iterator(this, data());}
    _LIBCPP_INLINE_VISIBILITY iterator       end()         {return iterator(this, __get_pointer() + size());}
    _LIBCPP_INLINE_VISIBILITY const_iterator end() const   {return const_iterator(this, data() + size());}
#endif  // _LIBCPP_DEBUG
    _LIBCPP_INLINE_VISIBILITY
    reverse_iterator rbegin() _NOEXCEPT
        {return reverse_iterator(end());}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rbegin() const _NOEXCEPT
        {return const_reverse_iterator(end());}
    _LIBCPP_INLINE_VISIBILITY
    reverse_iterator rend() _NOEXCEPT
        {return reverse_iterator(begin());}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator rend() const _NOEXCEPT
        {return const_reverse_iterator(begin());}

    _LIBCPP_INLINE_VISIBILITY
    const_iterator cbegin() const _NOEXCEPT
        {return begin();}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator cend() const _NOEXCEPT
        {return end();}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crbegin() const _NOEXCEPT
        {return rbegin();}
    _LIBCPP_INLINE_VISIBILITY
    const_reverse_iterator crend() const _NOEXCEPT
        {return rend();}

    _LIBCPP_INLINE_VISIBILITY size_type size() const _NOEXCEPT
        {return __is_long() ? __get_long_size() : __get_short_size();}
    _LIBCPP_INLINE_VISIBILITY size_type length() const _NOEXCEPT {return size();}
    _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY size_type capacity() const _NOEXCEPT
        {return (__is_long() ? __get_long_cap() : __min_cap) - 1;}

    void resize(size_type __n, value_type __c);
    _LIBCPP_INLINE_VISIBILITY void resize(size_type __n) {resize(__n, value_type());}

    void reserve(size_type res_arg = 0);
    _LIBCPP_INLINE_VISIBILITY
    void shrink_to_fit() _NOEXCEPT {reserve();}
    _LIBCPP_INLINE_VISIBILITY
    void clear() _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY bool empty() const _NOEXCEPT {return size() == 0;}

    _LIBCPP_INLINE_VISIBILITY const_reference operator[](size_type __pos) const;
    _LIBCPP_INLINE_VISIBILITY reference       operator[](size_type __pos);

    const_reference at(size_type __n) const;
    reference       at(size_type __n);

    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const basic_string& __str) {return append(__str);}
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const_pointer __s)         {return append(__s);}
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(value_type __c)            {push_back(__c); return *this;}
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(initializer_list<value_type> __il) {return append(__il);}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    _LIBCPP_INLINE_VISIBILITY
    basic_string& append(const basic_string& __str);
    basic_string& append(const basic_string& __str, size_type __pos, size_type __n);
    basic_string& append(const_pointer __s, size_type __n);
    basic_string& append(const_pointer __s);
    basic_string& append(size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            basic_string&
        >::type
        append(_InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            basic_string&
        >::type
        append(_ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& append(initializer_list<value_type> __il) {return append(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    void push_back(value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    void pop_back();
    _LIBCPP_INLINE_VISIBILITY reference       front();
    _LIBCPP_INLINE_VISIBILITY const_reference front() const;
    _LIBCPP_INLINE_VISIBILITY reference       back();
    _LIBCPP_INLINE_VISIBILITY const_reference back() const;

    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(const basic_string& __str);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(basic_string&& str)
        {*this = _VSTD::move(str); return *this;}
#endif
    basic_string& assign(const basic_string& __str, size_type __pos, size_type __n);
    basic_string& assign(const_pointer __s, size_type __n);
    basic_string& assign(const_pointer __s);
    basic_string& assign(size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            basic_string&
        >::type
        assign(_InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            basic_string&
        >::type
        assign(_ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& assign(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    _LIBCPP_INLINE_VISIBILITY
    basic_string& insert(size_type __pos1, const basic_string& __str);
    basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n);
    basic_string& insert(size_type __pos, const_pointer __s, size_type __n);
    basic_string& insert(size_type __pos, const_pointer __s);
    basic_string& insert(size_type __pos, size_type __n, value_type __c);
    iterator      insert(const_iterator __pos, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    iterator      insert(const_iterator __pos, size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
             __is_input_iterator  <_InputIterator>::value &&
            !__is_forward_iterator<_InputIterator>::value,
            iterator
        >::type
        insert(const_iterator __pos, _InputIterator __first, _InputIterator __last);
    template<class _ForwardIterator>
        typename enable_if
        <
            __is_forward_iterator<_ForwardIterator>::value,
            iterator
        >::type
        insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    iterator insert(const_iterator __pos, initializer_list<value_type> __il)
                    {return insert(__pos, __il.begin(), __il.end());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    basic_string& erase(size_type __pos = 0, size_type __n = npos);
    _LIBCPP_INLINE_VISIBILITY
    iterator      erase(const_iterator __pos);
    _LIBCPP_INLINE_VISIBILITY
    iterator      erase(const_iterator __first, const_iterator __last);

    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str);
    basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const_pointer __s, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const_pointer __s);
    basic_string& replace(size_type __pos, size_type __n1, size_type __n2, value_type __c);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const basic_string& __str);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const_pointer __s, size_type __n);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, const_pointer __s);
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c);
    template<class _InputIterator>
        typename enable_if
        <
            __is_input_iterator<_InputIterator>::value,
            basic_string&
        >::type
        replace(const_iterator __i1, const_iterator __i2, _InputIterator __j1, _InputIterator __j2);
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
    _LIBCPP_INLINE_VISIBILITY
    basic_string& replace(const_iterator __i1, const_iterator __i2, initializer_list<value_type> __il)
        {return replace(__i1, __i2, __il.begin(), __il.end());}
#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

    size_type copy(pointer __s, size_type __n, size_type __pos = 0) const;
    _LIBCPP_INLINE_VISIBILITY
    basic_string substr(size_type __pos = 0, size_type __n = npos) const;

    _LIBCPP_INLINE_VISIBILITY
    void swap(basic_string& __str)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value);

    _LIBCPP_INLINE_VISIBILITY
    const_pointer c_str() const _NOEXCEPT {return data();}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer data() const _NOEXCEPT  {return __get_pointer();}

    _LIBCPP_INLINE_VISIBILITY
    allocator_type get_allocator() const _NOEXCEPT {return __alloc();}

    _LIBCPP_INLINE_VISIBILITY
    size_type find(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
    size_type find(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type rfind(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type rfind(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
    size_type rfind(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find_first_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type find_last_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _NOEXCEPT;
    size_type find_first_not_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(const_pointer __s, size_type __pos = 0) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_first_not_of(value_type __c, size_type __pos = 0) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _NOEXCEPT;
    size_type find_last_not_of(const_pointer __s, size_type __pos, size_type __n) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(const_pointer __s, size_type __pos = npos) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    size_type find_last_not_of(value_type __c, size_type __pos = npos) const _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY
    int compare(const basic_string& __str) const _NOEXCEPT;
    _LIBCPP_INLINE_VISIBILITY
    int compare(size_type __pos1, size_type __n1, const basic_string& __str) const;
    int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2) const;
    int compare(const_pointer __s) const _NOEXCEPT;
    int compare(size_type __pos1, size_type __n1, const_pointer __s) const;
    int compare(size_type __pos1, size_type __n1, const_pointer __s, size_type __n2) const;

    _LIBCPP_INLINE_VISIBILITY bool __invariants() const;
private:
    _LIBCPP_INLINE_VISIBILITY
    allocator_type& __alloc() _NOEXCEPT
        {return __r_.second();}
    _LIBCPP_INLINE_VISIBILITY
    const allocator_type& __alloc() const _NOEXCEPT
        {return __r_.second();}

    _LIBCPP_INLINE_VISIBILITY
    bool __is_long() const _NOEXCEPT
        {return bool(__r_.first().__s.__size_ & __short_mask);}

    _LIBCPP_INLINE_VISIBILITY
    void __set_short_size(size_type __s) _NOEXCEPT
#if _LIBCPP_BIG_ENDIAN
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
#else
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
#endif
    _LIBCPP_INLINE_VISIBILITY
    size_type __get_short_size() const _NOEXCEPT
#if _LIBCPP_BIG_ENDIAN
        {return __r_.first().__s.__size_;}
#else
        {return __r_.first().__s.__size_ >> 1;}
#endif
    _LIBCPP_INLINE_VISIBILITY
    void __set_long_size(size_type __s) _NOEXCEPT
        {__r_.first().__l.__size_ = __s;}
    _LIBCPP_INLINE_VISIBILITY
    size_type __get_long_size() const _NOEXCEPT
        {return __r_.first().__l.__size_;}
    _LIBCPP_INLINE_VISIBILITY
    void __set_size(size_type __s) _NOEXCEPT
        {if (__is_long()) __set_long_size(__s); else __set_short_size(__s);}

    _LIBCPP_INLINE_VISIBILITY
    void __set_long_cap(size_type __s) _NOEXCEPT
        {__r_.first().__l.__cap_  = __long_mask | __s;}
    _LIBCPP_INLINE_VISIBILITY
    size_type __get_long_cap() const _NOEXCEPT
        {return __r_.first().__l.__cap_ & size_type(~__long_mask);}

    _LIBCPP_INLINE_VISIBILITY
    void __set_long_pointer(pointer __p) _NOEXCEPT
        {__r_.first().__l.__data_ = __p;}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_long_pointer() _NOEXCEPT
        {return __r_.first().__l.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_long_pointer() const _NOEXCEPT
        {return __r_.first().__l.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_short_pointer() _NOEXCEPT
        {return __r_.first().__s.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_short_pointer() const _NOEXCEPT
        {return __r_.first().__s.__data_;}
    _LIBCPP_INLINE_VISIBILITY
    pointer __get_pointer() _NOEXCEPT
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}
    _LIBCPP_INLINE_VISIBILITY
    const_pointer __get_pointer() const _NOEXCEPT
        {return __is_long() ? __get_long_pointer() : __get_short_pointer();}

    _LIBCPP_INLINE_VISIBILITY
    void __zero() _NOEXCEPT
        {
            size_type (&__a)[__n_words] = __r_.first().__r.__words;
            for (unsigned __i = 0; __i < __n_words; ++__i)
                __a[__i] = 0;
        }

    template <size_type __a> static
        _LIBCPP_INLINE_VISIBILITY
        size_type __align(size_type __s) _NOEXCEPT
            {return __s + (__a-1) & ~(__a-1);}
    enum {__alignment = 16};
    static _LIBCPP_INLINE_VISIBILITY
    size_type __recommend(size_type __s) _NOEXCEPT
        {return (__s < __min_cap ? __min_cap :
                 __align<sizeof(value_type) < __alignment ?
                            __alignment/sizeof(value_type) : 1 > (__s+1)) - 1;}

    void __init(const_pointer __s, size_type __sz, size_type __reserve);
    void __init(const_pointer __s, size_type __sz);
    void __init(size_type __n, value_type __c);

    template <class _InputIterator>
    typename enable_if
    <
         __is_input_iterator  <_InputIterator>::value &&
        !__is_forward_iterator<_InputIterator>::value,
        void
    >::type
    __init(_InputIterator __first, _InputIterator __last);

    template <class _ForwardIterator>
    typename enable_if
    <
        __is_forward_iterator<_ForwardIterator>::value,
        void
    >::type
    __init(_ForwardIterator __first, _ForwardIterator __last);

    void __grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                   size_type __n_copy,  size_type __n_del,     size_type __n_add = 0);
    void __grow_by_and_replace(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                               size_type __n_copy,  size_type __n_del,
                               size_type __n_add, const_pointer __p_new_stuff);

    _LIBCPP_INLINE_VISIBILITY
    void __erase_to_end(size_type __pos);

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string& __str)
        {__copy_assign_alloc(__str, integral_constant<bool,
                      __alloc_traits::propagate_on_container_copy_assignment::value>());}

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string& __str, true_type)
        {
            if (__alloc() != __str.__alloc())
            {
                clear();
                shrink_to_fit();
            }
            __alloc() = __str.__alloc();
        }

    _LIBCPP_INLINE_VISIBILITY
    void __copy_assign_alloc(const basic_string&, false_type) _NOEXCEPT
        {}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    _LIBCPP_INLINE_VISIBILITY
    void __move_assign(basic_string& __str, false_type);
    _LIBCPP_INLINE_VISIBILITY
    void __move_assign(basic_string& __str, true_type)
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value);
#endif

    _LIBCPP_INLINE_VISIBILITY
    void
    __move_assign_alloc(basic_string& __str)
        _NOEXCEPT_(
            !__alloc_traits::propagate_on_container_move_assignment::value ||
            is_nothrow_move_assignable<allocator_type>::value)
    {__move_assign_alloc(__str, integral_constant<bool,
                      __alloc_traits::propagate_on_container_move_assignment::value>());}

    _LIBCPP_INLINE_VISIBILITY
    void __move_assign_alloc(basic_string& __c, true_type)
        _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
        {
            __alloc() = _VSTD::move(__c.__alloc());
        }

    _LIBCPP_INLINE_VISIBILITY
    void __move_assign_alloc(basic_string&, false_type)
        _NOEXCEPT
        {}

    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type& __x, allocator_type& __y)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value)
        {__swap_alloc(__x, __y, integral_constant<bool,
                      __alloc_traits::propagate_on_container_swap::value>());}

    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type& __x, allocator_type& __y, true_type)
        _NOEXCEPT_(__is_nothrow_swappable<allocator_type>::value)
        {
            using _VSTD::swap;
            swap(__x, __y);
        }
    _LIBCPP_INLINE_VISIBILITY
    static void __swap_alloc(allocator_type&, allocator_type&, false_type) _NOEXCEPT
        {}

    _LIBCPP_INLINE_VISIBILITY void __invalidate_all_iterators();
    _LIBCPP_INLINE_VISIBILITY void __invalidate_iterators_past(size_type);

    friend basic_string operator+<>(const basic_string&, const basic_string&);
    friend basic_string operator+<>(const value_type*, const basic_string&);
    friend basic_string operator+<>(value_type, const basic_string&);
    friend basic_string operator+<>(const basic_string&, const value_type*);
    friend basic_string operator+<>(const basic_string&, value_type);
};

template <class _CharT, class _Traits, class _Allocator>
#ifndef _LIBCPP_DEBUG
_LIBCPP_INLINE_VISIBILITY inline
#endif
void
basic_string<_CharT, _Traits, _Allocator>::__invalidate_all_iterators()
{
#ifdef _LIBCPP_DEBUG
    iterator::__remove_all(this);
    const_iterator::__remove_all(this);
#endif  // _LIBCPP_DEBUG
}

template <class _CharT, class _Traits, class _Allocator>
#ifndef _LIBCPP_DEBUG
_LIBCPP_INLINE_VISIBILITY inline
#endif
void
basic_string<_CharT, _Traits, _Allocator>::__invalidate_iterators_past(size_type
#ifdef _LIBCPP_DEBUG
                                                                        __pos
#endif
                                                                      )
{
#ifdef _LIBCPP_DEBUG
    const_iterator __beg = begin();
    if (__iterator_list_.first)
    {
        for (iterator* __p = __iterator_list_.first; __p;)
        {
            if (*__p - __beg > static_cast<difference_type>(__pos))
            {
                iterator* __n = __p;
                __p = __p->__next;
                __n->__remove_owner();
            }
            else
                __p = __p->__next;
        }
    }
    if (__iterator_list_.second)
    {
        for (const_iterator* __p = __iterator_list_.second; __p;)
        {
            if (*__p - __beg > static_cast<difference_type>(__pos))
            {
                const_iterator* __n = __p;
                __p = __p->__next;
                __n->__remove_owner();
            }
            else
                __p = __p->__next;
        }
    }
#endif  // _LIBCPP_DEBUG
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string()
    _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
{
    __zero();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a)
    : __r_(__a)
{
    __zero();
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(const_pointer __s, size_type __sz, size_type __reserve)
{
    if (__reserve > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__reserve < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__reserve);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    traits_type::copy(__p, __s, __sz);
    traits_type::assign(__p[__sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(const_pointer __s, size_type __sz)
{
    if (__sz > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__sz < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__sz);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    traits_type::copy(__p, __s, __sz);
    traits_type::assign(__p[__sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, const allocator_type& __a)
    : __r_(__a)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(const_pointer __s, size_type __n, const allocator_type& __a)
    : __r_(__a)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    __init(__s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str)
    : __r_(__alloc_traits::select_on_container_copy_construction(__str.__alloc()))
{
    if (!__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(__str.__get_long_pointer(), __str.__get_long_size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, const allocator_type& __a)
    : __r_(__a)
{
    if (!__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(__str.__get_long_pointer(), __str.__get_long_size());
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str)
        _NOEXCEPT_(is_nothrow_move_constructible<allocator_type>::value)
    : __r_(_VSTD::move(__str.__r_))
{
    __str.__zero();
#ifdef _LIBCPP_DEBUG
    __str.__invalidate_all_iterators();
#endif
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(basic_string&& __str, const allocator_type& __a)
    : __r_(__a)
{
    if (__a == __str.__alloc() || !__str.__is_long())
        __r_.first().__r = __str.__r_.first().__r;
    else
        __init(__str.__get_long_pointer(), __str.__get_long_size());
    __str.__zero();
#ifdef _LIBCPP_DEBUG
    __str.__invalidate_all_iterators();
#endif
}

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__init(size_type __n, value_type __c)
{
    if (__n > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__n < __min_cap)
    {
        __set_short_size(__n);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__n);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__n);
    }
    traits_type::assign(__p, __n, __c);
    traits_type::assign(__p[__n], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c)
{
    __init(__n, __c);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(size_type __n, value_type __c, const allocator_type& __a)
    : __r_(__a)
{
    __init(__n, __c);
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::basic_string(const basic_string& __str, size_type __pos, size_type __n,
                                                        const allocator_type& __a)
    : __r_(__a)
{
    size_type __str_sz = __str.size();
    if (__pos > __str_sz)
        this->__throw_out_of_range();
    __init(__str.data() + __pos, _VSTD::min(__n, __str_sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
template <class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    void
>::type
basic_string<_CharT, _Traits, _Allocator>::__init(_InputIterator __first, _InputIterator __last)
{
    __zero();
#ifndef _LIBCPP_NO_EXCEPTIONS
    try
    {
#endif  // _LIBCPP_NO_EXCEPTIONS
    for (; __first != __last; ++__first)
        push_back(*__first);
#ifndef _LIBCPP_NO_EXCEPTIONS
    }
    catch (...)
    {
        if (__is_long())
            __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
        throw;
    }
#endif  // _LIBCPP_NO_EXCEPTIONS
}

template <class _CharT, class _Traits, class _Allocator>
template <class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    void
>::type
basic_string<_CharT, _Traits, _Allocator>::__init(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __sz = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__sz > max_size())
        this->__throw_length_error();
    pointer __p;
    if (__sz < __min_cap)
    {
        __set_short_size(__sz);
        __p = __get_short_pointer();
    }
    else
    {
        size_type __cap = __recommend(__sz);
        __p = __alloc_traits::allocate(__alloc(), __cap+1);
        __set_long_pointer(__p);
        __set_long_cap(__cap+1);
        __set_long_size(__sz);
    }
    for (; __first != __last; ++__first, ++__p)
        traits_type::assign(*__p, *__first);
    traits_type::assign(*__p, value_type());
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last)
{
    __init(__first, __last);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(_InputIterator __first, _InputIterator __last,
                                                        const allocator_type& __a)
    : __r_(__a)
{
    __init(__first, __last);
}

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il)
{
    __init(__il.begin(), __il.end());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>::basic_string(initializer_list<value_type> __il, const allocator_type& __a)
    : __r_(__a)
{
    __init(__il.begin(), __il.end());
}

#endif  // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>::~basic_string()
{
    __invalidate_all_iterators();
    if (__is_long())
        __alloc_traits::deallocate(__alloc(), __get_long_pointer(), __get_long_cap());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__grow_by_and_replace
    (size_type __old_cap, size_type __delta_cap, size_type __old_sz,
     size_type __n_copy,  size_type __n_del,     size_type __n_add, const_pointer __p_new_stuff)
{
    size_type __ms = max_size();
    if (__delta_cap > __ms - __old_cap - 1)
        this->__throw_length_error();
    pointer __old_p = __get_pointer();
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
                          __ms - 1;
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
    __invalidate_all_iterators();
    if (__n_copy != 0)
        traits_type::copy(__p, __old_p, __n_copy);
    if (__n_add != 0)
        traits_type::copy(__p + __n_copy, __p_new_stuff, __n_add);
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
    if (__sec_cp_sz != 0)
        traits_type::copy(__p + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz);
    if (__old_cap+1 != __min_cap)
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
    __set_long_pointer(__p);
    __set_long_cap(__cap+1);
    __old_sz = __n_copy + __n_add + __sec_cp_sz;
    __set_long_size(__old_sz);
    traits_type::assign(__p[__old_sz], value_type());
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::__grow_by(size_type __old_cap, size_type __delta_cap, size_type __old_sz,
                                                     size_type __n_copy,  size_type __n_del,     size_type __n_add)
{
    size_type __ms = max_size();
    if (__delta_cap > __ms - __old_cap - 1)
        this->__throw_length_error();
    pointer __old_p = __get_pointer();
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                          __recommend(_VSTD::max(__old_cap + __delta_cap, 2 * __old_cap)) :
                          __ms - 1;
    pointer __p = __alloc_traits::allocate(__alloc(), __cap+1);
    __invalidate_all_iterators();
    if (__n_copy != 0)
        traits_type::copy(__p, __old_p, __n_copy);
    size_type __sec_cp_sz = __old_sz - __n_del - __n_copy;
    if (__sec_cp_sz != 0)
        traits_type::copy(__p + __n_copy + __n_add, __old_p + __n_copy + __n_del, __sec_cp_sz);
    if (__old_cap+1 != __min_cap)
        __alloc_traits::deallocate(__alloc(), __old_p, __old_cap+1);
    __set_long_pointer(__p);
    __set_long_cap(__cap+1);
}

// assign

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const_pointer __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __cap = capacity();
    if (__cap >= __n)
    {
        pointer __p = __get_pointer();
        traits_type::move(__p, __s, __n);
        traits_type::assign(__p[__n], value_type());
        __set_size(__n);
        __invalidate_iterators_past(__n);
    }
    else
    {
        size_type __sz = size();
        __grow_by_and_replace(__cap, __n - __cap, __sz, 0, __sz, __n, __s);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(size_type __n, value_type __c)
{
    size_type __cap = capacity();
    if (__cap < __n)
    {
        size_type __sz = size();
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
    }
    else
        __invalidate_iterators_past(__n);
    pointer __p = __get_pointer();
    traits_type::assign(__p, __n, __c);
    traits_type::assign(__p[__n], value_type());
    __set_size(__n);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(value_type __c)
{
    pointer __p;
    if (__is_long())
    {
        __p = __get_long_pointer();
        __set_long_size(1);
    }
    else
    {
        __p = __get_short_pointer();
        __set_short_size(1);
    }
    traits_type::assign(*__p, __c);
    traits_type::assign(*++__p, value_type());
    __invalidate_iterators_past(1);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(const basic_string& __str)
{
    if (this != &__str)
    {
        __copy_assign_alloc(__str);
        assign(__str);
    }
    return *this;
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, false_type)
{
    if (__alloc() != __str.__alloc())
        assign(__str);
    else
        __move_assign(__str, true_type());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__move_assign(basic_string& __str, true_type)
    _NOEXCEPT_(is_nothrow_move_assignable<allocator_type>::value)
{
    clear();
    shrink_to_fit();
    __r_.first() = __str.__r_.first();
    __move_assign_alloc(__str);
    __str.__zero();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::operator=(basic_string&& __str)
    _NOEXCEPT_(__alloc_traits::propagate_on_container_move_assignment::value &&
               is_nothrow_move_assignable<allocator_type>::value)
{
    __move_assign(__str, integral_constant<bool,
          __alloc_traits::propagate_on_container_move_assignment::value>());
    return *this;
}

#endif

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::assign(_InputIterator __first, _InputIterator __last)
{
    clear();
    for (; __first != __last; ++__first)
        push_back(*__first);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::assign(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    size_type __cap = capacity();
    if (__cap < __n)
    {
        size_type __sz = size();
        __grow_by(__cap, __n - __cap, __sz, 0, __sz);
    }
    else
        __invalidate_iterators_past(__n);
    pointer __p = __get_pointer();
    for (; __first != __last; ++__first, ++__p)
        traits_type::assign(*__p, *__first);
    traits_type::assign(*__p, value_type());
    __set_size(__n);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str)
{
    return assign(__str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const basic_string& __str, size_type __pos, size_type __n)
{
    size_type __sz = __str.size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    return assign(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::assign(const_pointer __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return assign(__s, traits_type::length(__s));
}

// append

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const_pointer __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __cap = capacity();
    size_type __sz = size();
    if (__cap - __sz >= __n)
    {
        if (__n)
        {
            pointer __p = __get_pointer();
            traits_type::copy(__p + __sz, __s, __n);
            __sz += __n;
            __set_size(__sz);
            traits_type::assign(__p[__sz], value_type());
        }
    }
    else
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __sz, 0, __n, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(size_type __n, value_type __c)
{
    if (__n)
    {
        size_type __cap = capacity();
        size_type __sz = size();
        if (__cap - __sz < __n)
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
        pointer __p = __get_pointer();
        traits_type::assign(__p + __sz, __n, __c);
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::push_back(value_type __c)
{
    size_type __cap = capacity();
    size_type __sz = size();
    if (__sz == __cap)
        __grow_by(__cap, 1, __sz, __sz, 0);
    pointer __p = __get_pointer() + __sz;
    traits_type::assign(*__p, __c);
    traits_type::assign(*++__p, value_type());
    __set_size(__sz+1);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::append(_InputIterator __first, _InputIterator __last)
{
    for (; __first != __last; ++__first)
        push_back(*__first);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::append(_ForwardIterator __first, _ForwardIterator __last)
{
    size_type __sz = size();
    size_type __cap = capacity();
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__n)
    {
        if (__cap - __sz < __n)
            __grow_by(__cap, __sz + __n - __cap, __sz, __sz, 0);
        pointer __p = __get_pointer() + __sz;
        for (; __first != __last; ++__p, ++__first)
            traits_type::assign(*__p, *__first);
        traits_type::assign(*__p, value_type());
        __set_size(__sz + __n);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str)
{
    return append(__str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const basic_string& __str, size_type __pos, size_type __n)
{
    size_type __sz = __str.size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    return append(__str.data() + __pos, _VSTD::min(__n, __sz - __pos));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::append(const_pointer __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return append(__s, traits_type::length(__s));
}

// insert

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const_pointer __s, size_type __n)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    size_type __cap = capacity();
    if (__cap - __sz >= __n)
    {
        if (__n)
        {
            pointer __p = __get_pointer();
            size_type __n_move = __sz - __pos;
            if (__n_move != 0)
            {
                if (__p + __pos <= __s && __s < __p + __sz)
                    __s += __n;
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
            }
            traits_type::move(__p + __pos, __s, __n);
            __sz += __n;
            __set_size(__sz);
            traits_type::assign(__p[__sz], value_type());
        }
    }
    else
        __grow_by_and_replace(__cap, __sz + __n - __cap, __sz, __pos, 0, __n, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, size_type __n, value_type __c)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    if (__n)
    {
        size_type __cap = capacity();
        pointer __p;
        if (__cap - __sz >= __n)
        {
            __p = __get_pointer();
            size_type __n_move = __sz - __pos;
            if (__n_move != 0)
                traits_type::move(__p + __pos + __n, __p + __pos, __n_move);
        }
        else
        {
            __grow_by(__cap, __sz + __n - __cap, __sz, __pos, 0, __n);
            __p = __get_long_pointer();
        }
        traits_type::assign(__p + __pos, __n, __c);
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
     __is_input_iterator  <_InputIterator>::value &&
    !__is_forward_iterator<_InputIterator>::value,
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
>::type
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _InputIterator __first, _InputIterator __last)
{
    size_type __old_sz = size();
    difference_type __ip = __pos - begin();
    for (; __first != __last; ++__first)
        push_back(*__first);
    pointer __p = __get_pointer();
    _VSTD::rotate(__p + __ip, __p + __old_sz, __p + size());
    return iterator(__p + __ip);
}

template <class _CharT, class _Traits, class _Allocator>
template<class _ForwardIterator>
typename enable_if
<
    __is_forward_iterator<_ForwardIterator>::value,
    typename basic_string<_CharT, _Traits, _Allocator>::iterator
>::type
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, _ForwardIterator __first, _ForwardIterator __last)
{
    size_type __ip = static_cast<size_type>(__pos - begin());
    size_type __sz = size();
    size_type __cap = capacity();
    size_type __n = static_cast<size_type>(_VSTD::distance(__first, __last));
    if (__n)
    {
        pointer __p;
        if (__cap - __sz >= __n)
        {
            __p = __get_pointer();
            size_type __n_move = __sz - __ip;
            if (__n_move != 0)
                traits_type::move(__p + __ip + __n, __p + __ip, __n_move);
        }
        else
        {
            __grow_by(__cap, __sz + __n - __cap, __sz, __ip, 0, __n);
            __p = __get_long_pointer();
        }
        __sz += __n;
        __set_size(__sz);
        traits_type::assign(__p[__sz], value_type());
        for (__p += __ip; __first != __last; ++__p, ++__first)
            traits_type::assign(*__p, *__first);
    }
    return begin() + __ip;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str)
{
    return insert(__pos1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos1, const basic_string& __str,
                                                  size_type __pos2, size_type __n)
{
    size_type __str_sz = __str.size();
    if (__pos2 > __str_sz)
        this->__throw_out_of_range();
    return insert(__pos1, __str.data() + __pos2, _VSTD::min(__n, __str_sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const_pointer __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return insert(__pos, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, value_type __c)
{
    size_type __ip = static_cast<size_type>(__pos - begin());
    size_type __sz = size();
    size_type __cap = capacity();
    pointer __p;
    if (__cap == __sz)
    {
        __grow_by(__cap, 1, __sz, __ip, 0, 1);
        __p = __get_long_pointer();
    }
    else
    {
        __p = __get_pointer();
        size_type __n_move = __sz - __ip;
        if (__n_move != 0)
            traits_type::move(__p + __ip + 1, __p + __ip, __n_move);
    }
    traits_type::assign(__p[__ip], __c);
    traits_type::assign(__p[++__sz], value_type());
    __set_size(__sz);
    return begin() + static_cast<difference_type>(__ip);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::insert(const_iterator __pos, size_type __n, value_type __c)
{
    difference_type __p = __pos - begin();
    insert(static_cast<size_type>(__p), __n, __c);
    return begin() + __p;
}

// replace

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const_pointer __s, size_type __n2)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    __n1 = _VSTD::min(__n1, __sz - __pos);
    size_type __cap = capacity();
    if (__cap - __sz + __n1 >= __n2)
    {
        pointer __p = __get_pointer();
        if (__n1 != __n2)
        {
            size_type __n_move = __sz - __pos - __n1;
            if (__n_move != 0)
            {
                if (__n1 > __n2)
                {
                    traits_type::move(__p + __pos, __s, __n2);
                    traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
                    goto __finish;
                }
                if (__p + __pos < __s && __s < __p + __sz)
                {
                    if (__p + __pos + __n1 <= __s)
                        __s += __n2 - __n1;
                    else // __p + __pos < __s < __p + __pos + __n1
                    {
                        traits_type::move(__p + __pos, __s, __n1);
                        __pos += __n1;
                        __s += __n2;
                        __n2 -= __n1;
                        __n1 = 0;
                    }
                }
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
            }
        }
        traits_type::move(__p + __pos, __s, __n2);
__finish:
        __sz += __n2 - __n1;
        __set_size(__sz);
        __invalidate_iterators_past(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    else
        __grow_by_and_replace(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2, __s);
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, size_type __n2, value_type __c)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    __n1 = _VSTD::min(__n1, __sz - __pos);
    size_type __cap = capacity();
    pointer __p;
    if (__cap - __sz + __n1 >= __n2)
    {
        __p = __get_pointer();
        if (__n1 != __n2)
        {
            size_type __n_move = __sz - __pos - __n1;
            if (__n_move != 0)
                traits_type::move(__p + __pos + __n2, __p + __pos + __n1, __n_move);
        }
    }
    else
    {
        __grow_by(__cap, __sz - __n1 + __n2 - __cap, __sz, __pos, __n1, __n2);
        __p = __get_long_pointer();
    }
    traits_type::assign(__p + __pos, __n2, __c);
    __sz += __n2 - __n1;
    __set_size(__sz);
    __invalidate_iterators_past(__sz);
    traits_type::assign(__p[__sz], value_type());
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
template<class _InputIterator>
typename enable_if
<
    __is_input_iterator<_InputIterator>::value,
    basic_string<_CharT, _Traits, _Allocator>&
>::type
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2,
                                                   _InputIterator __j1, _InputIterator __j2)
{
    for (; true; ++__i1, ++__j1)
    {
        if (__i1 == __i2)
        {
            if (__j1 != __j2)
                insert(__i1, __j1, __j2);
            break;
        }
        if (__j1 == __j2)
        {
            erase(__i1, __i2);
            break;
        }
        traits_type::assign(const_cast<value_type&>(*__i1), *__j1);
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str)
{
    return replace(__pos1, __n1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos1, size_type __n1, const basic_string& __str,
                                                   size_type __pos2, size_type __n2)
{
    size_type __str_sz = __str.size();
    if (__pos2 > __str_sz)
        this->__throw_out_of_range();
    return replace(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2, __str_sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const_pointer __s)
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return replace(__pos, __n1, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const basic_string& __str)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1),
                   __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const_pointer __s, size_type __n)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s, __n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const_pointer __s)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __s);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, size_type __n, value_type __c)
{
    return replace(static_cast<size_type>(__i1 - begin()), static_cast<size_type>(__i2 - __i1), __n, __c);
}

// erase

template <class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>&
basic_string<_CharT, _Traits, _Allocator>::erase(size_type __pos, size_type __n)
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    if (__n)
    {
        pointer __p = __get_pointer();
        __n = _VSTD::min(__n, __sz - __pos);
        size_type __n_move = __sz - __pos - __n;
        if (__n_move != 0)
            traits_type::move(__p + __pos, __p + __pos + __n, __n_move);
        __sz -= __n;
        __set_size(__sz);
        __invalidate_iterators_past(__sz);
        traits_type::assign(__p[__sz], value_type());
    }
    return *this;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __pos)
{
    iterator __b = begin();
    size_type __r = static_cast<size_type>(__pos - __b);
    erase(__r, 1);
    return __b + static_cast<difference_type>(__r);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::iterator
basic_string<_CharT, _Traits, _Allocator>::erase(const_iterator __first, const_iterator __last)
{
    iterator __b = begin();
    size_type __r = static_cast<size_type>(__first - __b);
    erase(__r, static_cast<size_type>(__last - __first));
    return __b + static_cast<difference_type>(__r);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::pop_back()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    size_type __sz;
    if (__is_long())
    {
        __sz = __get_long_size() - 1;
        __set_long_size(__sz);
        traits_type::assign(*(__get_long_pointer() + __sz), value_type());
    }
    else
    {
        __sz = __get_short_size() - 1;
        __set_short_size(__sz);
        traits_type::assign(*(__get_short_pointer() + __sz), value_type());
    }
    __invalidate_iterators_past(__sz);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::clear() _NOEXCEPT
{
    __invalidate_all_iterators();
    if (__is_long())
    {
        traits_type::assign(*__get_long_pointer(), value_type());
        __set_long_size(0);
    }
    else
    {
        traits_type::assign(*__get_short_pointer(), value_type());
        __set_short_size(0);
    }
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::__erase_to_end(size_type __pos)
{
    if (__is_long())
    {
        traits_type::assign(*(__get_long_pointer() + __pos), value_type());
        __set_long_size(__pos);
    }
    else
    {
        traits_type::assign(*(__get_short_pointer() + __pos), value_type());
        __set_short_size(__pos);
    }
    __invalidate_iterators_past(__pos);
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::resize(size_type __n, value_type __c)
{
    size_type __sz = size();
    if (__n > __sz)
        append(__n - __sz, __c);
    else
        __erase_to_end(__n);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::max_size() const _NOEXCEPT
{
    size_type __m = __alloc_traits::max_size(__alloc());
#if _LIBCPP_BIG_ENDIAN
    return (__m <= ~__long_mask ? __m : __m/2) - 1;
#else
    return __m - 1;
#endif
}

template <class _CharT, class _Traits, class _Allocator>
void
basic_string<_CharT, _Traits, _Allocator>::reserve(size_type __res_arg)
{
    if (__res_arg > max_size())
        this->__throw_length_error();
    size_type __cap = capacity();
    size_type __sz = size();
    __res_arg = _VSTD::max(__res_arg, __sz);
    __res_arg = __recommend(__res_arg);
    if (__res_arg != __cap)
    {
        pointer __new_data, __p;
        bool __was_long, __now_long;
        if (__res_arg == __min_cap - 1)
        {
            __was_long = true;
            __now_long = false;
            __new_data = __get_short_pointer();
            __p = __get_long_pointer();
        }
        else
        {
            if (__res_arg > __cap)
                __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
            else
            {
            #ifndef _LIBCPP_NO_EXCEPTIONS
                try
                {
            #endif  // _LIBCPP_NO_EXCEPTIONS
                    __new_data = __alloc_traits::allocate(__alloc(), __res_arg+1);
            #ifndef _LIBCPP_NO_EXCEPTIONS
                }
                catch (...)
                {
                    return;
                }
            #else  // _LIBCPP_NO_EXCEPTIONS
                if (__new_data == 0)
                    return;
            #endif  // _LIBCPP_NO_EXCEPTIONS
            }
            __now_long = true;
            __was_long = __is_long();
            __p = __get_pointer();
        }
        traits_type::copy(__new_data, __p, size()+1);
        if (__was_long)
            __alloc_traits::deallocate(__alloc(), __p, __cap+1);
        if (__now_long)
        {
            __set_long_cap(__res_arg+1);
            __set_long_size(__sz);
            __set_long_pointer(__new_data);
        }
        else
            __set_short_size(__sz);
        __invalidate_all_iterators();
    }
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos) const
{
#ifdef __LIBCPP_DEBUG
    assert(__pos <= size());
#endif
    return *(data() + __pos);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::operator[](size_type __pos)
{
#ifdef __LIBCPP_DEBUG
    assert(__pos < size());
#endif
    return *(__get_pointer() + __pos);
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n) const
{
    if (__n >= size())
        this->__throw_out_of_range();
    return (*this)[__n];
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::at(size_type __n)
{
    if (__n >= size())
        this->__throw_out_of_range();
    return (*this)[__n];
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::front()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *__get_pointer();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::front() const
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *data();
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::reference
basic_string<_CharT, _Traits, _Allocator>::back()
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *(__get_pointer() + size() - 1);
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::const_reference
basic_string<_CharT, _Traits, _Allocator>::back() const
{
#ifdef _LIBCPP_DEBUG
    assert(!empty());
#endif
    return *(data() + size() - 1);
}

template <class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::copy(pointer __s, size_type __n, size_type __pos) const
{
    size_type __sz = size();
    if (__pos > __sz)
        this->__throw_out_of_range();
    size_type __rlen = _VSTD::min(__n, __sz - __pos);
    traits_type::copy(__s, data() + __pos, __rlen);
    return __rlen;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
basic_string<_CharT, _Traits, _Allocator>::substr(size_type __pos, size_type __n) const
{
    return basic_string(*this, __pos, __n, __alloc());
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str)
        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                   __is_nothrow_swappable<allocator_type>::value)
{
    _VSTD::swap(__r_.first(), __str.__r_.first());
    __swap_alloc(__alloc(), __str.__alloc());
#ifdef _LIBCPP_DEBUG
    __invalidate_all_iterators();
    __str.__invalidate_all_iterators();
#endif  // _LIBCPP_DEBUG
}

// find

template <class _Traits>
struct _LIBCPP_HIDDEN __traits_eq
{
    typedef typename _Traits::char_type char_type;
    _LIBCPP_INLINE_VISIBILITY
    bool operator()(const char_type& __x, const char_type& __y) _NOEXCEPT
        {return _Traits::eq(__x, __y);}
};

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const_pointer __s,
                                                size_type __pos,
                                                size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos > __sz || __sz - __pos < __n)
        return npos;
    if (__n == 0)
        return __pos;
    const_pointer __p = data();
    const_pointer __r = _VSTD::search(__p + __pos, __p + __sz, __s, __s + __n,
                                     __traits_eq<traits_type>());
    if (__r == __p + __sz)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const basic_string& __str,
                                                size_type __pos) const _NOEXCEPT
{
    return find(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(const_pointer __s,
                                                size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find(value_type __c,
                                                size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos >= __sz)
        return npos;
    const_pointer __p = data();
    const_pointer __r = traits_type::find(__p + __pos, __sz - __pos, __c);
    if (__r == 0)
        return npos;
    return static_cast<size_type>(__r - __p);
}

// rfind

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const_pointer __s,
                                                 size_type __pos,
                                                 size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    __pos = _VSTD::min(__pos, __sz);
    if (__n < __sz - __pos)
        __pos += __n;
    else
        __pos = __sz;
    const_pointer __p = data();
    const_pointer __r = _VSTD::find_end(__p, __p + __pos, __s, __s + __n,
                                       __traits_eq<traits_type>());
    if (__n > 0 && __r == __p + __pos)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const basic_string& __str,
                                                 size_type __pos) const _NOEXCEPT
{
    return rfind(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(const_pointer __s,
                                                 size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return rfind(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::rfind(value_type __c,
                                                 size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__sz)
    {
        if (__pos < __sz)
            ++__pos;
        else
            __pos = __sz;
        const_pointer __p = data();
        for (const_pointer __ps = __p + __pos; __ps != __p;)
        {
            if (traits_type::eq(*--__ps, __c))
                return static_cast<size_type>(__ps - __p);
        }
    }
    return npos;
}

// find_first_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const_pointer __s,
                                                         size_type __pos,
                                                         size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos >= __sz || __n == 0)
        return npos;
    const_pointer __p = data();
    const_pointer __r = _VSTD::find_first_of(__p + __pos, __p + __sz, __s,
                                            __s + __n, __traits_eq<traits_type>());
    if (__r == __p + __sz)
        return npos;
    return static_cast<size_type>(__r - __p);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const basic_string& __str,
                                                         size_type __pos) const _NOEXCEPT
{
    return find_first_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const_pointer __s,
                                                         size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_first_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_of(value_type __c,
                                                         size_type __pos) const _NOEXCEPT
{
    return find(__c, __pos);
}

// find_last_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const_pointer __s,
                                                        size_type __pos,
                                                        size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    if (__n != 0)
    {
        size_type __sz = size();
        if (__pos < __sz)
            ++__pos;
        else
            __pos = __sz;
        const_pointer __p = data();
        for (const_pointer __ps = __p + __pos; __ps != __p;)
        {
            const_pointer __r = traits_type::find(__s, __n, *--__ps);
            if (__r)
                return static_cast<size_type>(__ps - __p);
        }
    }
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const basic_string& __str,
                                                        size_type __pos) const _NOEXCEPT
{
    return find_last_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const_pointer __s,
                                                        size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_last_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_of(value_type __c,
                                                        size_type __pos) const _NOEXCEPT
{
    return rfind(__c, __pos);
}

// find_first_not_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const_pointer __s,
                                                             size_type __pos,
                                                             size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos < __sz)
    {
        const_pointer __p = data();
        const_pointer __pe = __p + __sz;
        for (const_pointer __ps = __p + __pos; __ps != __pe; ++__ps)
            if (traits_type::find(__s, __n, *__ps) == 0)
                return static_cast<size_type>(__ps - __p);
    }
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const basic_string& __str,
                                                             size_type __pos) const _NOEXCEPT
{
    return find_first_not_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const_pointer __s,
                                                             size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_first_not_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(value_type __c,
                                                             size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos < __sz)
    {
        const_pointer __p = data();
        const_pointer __pe = __p + __sz;
        for (const_pointer __ps = __p + __pos; __p != __pe; ++__ps)
            if (!traits_type::eq(*__ps, __c))
                return static_cast<size_type>(__ps - __p);
    }
    return npos;
}

// find_last_not_of

template<class _CharT, class _Traits, class _Allocator>
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const_pointer __s,
                                                            size_type __pos,
                                                            size_type __n) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos < __sz)
        ++__pos;
    else
        __pos = __sz;
    const_pointer __p = data();
    for (const_pointer __ps = __p + __pos; __ps != __p;)
        if (traits_type::find(__s, __n, *--__ps) == 0)
            return static_cast<size_type>(__ps - __p);
    return npos;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const basic_string& __str,
                                                            size_type __pos) const _NOEXCEPT
{
    return find_last_not_of(__str.data(), __pos, __str.size());
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const_pointer __s,
                                                            size_type __pos) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return find_last_not_of(__s, __pos, traits_type::length(__s));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
typename basic_string<_CharT, _Traits, _Allocator>::size_type
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(value_type __c,
                                                            size_type __pos) const _NOEXCEPT
{
    size_type __sz = size();
    if (__pos < __sz)
        ++__pos;
    else
        __pos = __sz;
    const_pointer __p = data();
    for (const_pointer __ps = __p + __pos; __ps != __p;)
        if (!traits_type::eq(*--__ps, __c))
            return static_cast<size_type>(__ps - __p);
    return npos;
}

// compare

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
int
basic_string<_CharT, _Traits, _Allocator>::compare(const basic_string& __str) const _NOEXCEPT
{
    size_t __lhs_sz = size();
    size_t __rhs_sz = __str.size();
    int __result = traits_type::compare(data(), __str.data(),
                                        _VSTD::min(__lhs_sz, __rhs_sz));
    if (__result != 0)
        return __result;
    if (__lhs_sz < __rhs_sz)
        return -1;
    if (__lhs_sz > __rhs_sz)
        return 1;
    return 0;
}

template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const basic_string& __str) const
{
    return compare(__pos1, __n1, __str.data(), __str.size());
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const basic_string& __str,
                                                   size_type __pos2,
                                                   size_type __n2) const
{
    size_type __sz = __str.size();
    if (__pos2 > __sz)
        this->__throw_out_of_range();
    return compare(__pos1, __n1, __str.data() + __pos2, _VSTD::min(__n2,
                                                                  __sz - __pos2));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(const_pointer __s) const _NOEXCEPT
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return compare(0, npos, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const_pointer __s) const
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    return compare(__pos1, __n1, __s, traits_type::length(__s));
}

template <class _CharT, class _Traits, class _Allocator>
int
basic_string<_CharT, _Traits, _Allocator>::compare(size_type __pos1,
                                                   size_type __n1,
                                                   const_pointer __s,
                                                   size_type __n2) const
{
#ifdef _LIBCPP_DEBUG
    assert(__s != 0);
#endif
    size_type __sz = size();
    if (__pos1 > __sz || __n2 == npos)
        this->__throw_out_of_range();
    size_type __rlen = _VSTD::min(__n1, __sz - __pos1);
    int __r = traits_type::compare(data() + __pos1, __s, _VSTD::min(__rlen, __n2));
    if (__r == 0)
    {
        if (__rlen < __n2)
            __r = -1;
        else if (__rlen > __n2)
            __r = 1;
    }
    return __r;
}

// __invariants

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
basic_string<_CharT, _Traits, _Allocator>::__invariants() const
{
    if (size() > capacity())
        return false;
    if (capacity() < __min_cap - 1)
        return false;
    if (data() == 0)
        return false;
    if (data()[size()] != value_type(0))
        return false;
    return true;
}

// operator==

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __lhs.size() == __rhs.size() && _Traits::compare(__lhs.data(),
                                                            __rhs.data(),
                                                            __lhs.size()) == 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs.compare(__lhs) == 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) == 0;
}

// operator!=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const basic_string<_CharT,_Traits,_Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator!=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__lhs == __rhs);
}

// operator<

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __lhs.compare(__rhs) < 0;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator< (const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs.compare(__lhs) > 0;
}

// operator>

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator> (const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return __rhs < __lhs;
}

// operator<=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator<=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__rhs < __lhs);
}

// operator>=

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
           const _CharT* __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator>=(const _CharT* __lhs,
           const basic_string<_CharT, _Traits, _Allocator>& __rhs) _NOEXCEPT
{
    return !(__lhs < __rhs);
}

// operator +

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs,
          const basic_string<_CharT, _Traits, _Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __lhs , const basic_string<_CharT,_Traits,_Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = _Traits::length(__lhs);
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(__lhs, __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Allocator>& __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__rhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = __rhs.size();
    __r.__init(&__lhs, 1, 1 + __rhs_sz);
    __r.append(__rhs.data(), __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, const _CharT* __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __rhs_sz = _Traits::length(__rhs);
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + __rhs_sz);
    __r.append(__rhs, __rhs_sz);
    return __r;
}

template<class _CharT, class _Traits, class _Allocator>
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, _CharT __rhs)
{
    basic_string<_CharT, _Traits, _Allocator> __r(__lhs.get_allocator());
    typename basic_string<_CharT, _Traits, _Allocator>::size_type __lhs_sz = __lhs.size();
    __r.__init(__lhs.data(), __lhs_sz, __lhs_sz + 1);
    __r.push_back(__rhs);
    return __r;
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const basic_string<_CharT, _Traits, _Allocator>& __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(const basic_string<_CharT, _Traits, _Allocator>& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
{
    return _VSTD::move(__rhs.insert(0, __lhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, basic_string<_CharT, _Traits, _Allocator>&& __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(const _CharT* __lhs , basic_string<_CharT,_Traits,_Allocator>&& __rhs)
{
    return _VSTD::move(__rhs.insert(0, __lhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(_CharT __lhs, basic_string<_CharT,_Traits,_Allocator>&& __rhs)
{
    __rhs.insert(__rhs.begin(), __lhs);
    return _VSTD::move(__rhs);
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, const _CharT* __rhs)
{
    return _VSTD::move(__lhs.append(__rhs));
}

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
basic_string<_CharT, _Traits, _Allocator>
operator+(basic_string<_CharT, _Traits, _Allocator>&& __lhs, _CharT __rhs)
{
    __lhs.push_back(__rhs);
    return _VSTD::move(__lhs);
}

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

// swap

template<class _CharT, class _Traits, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
void
swap(basic_string<_CharT, _Traits, _Allocator>& __lhs,
     basic_string<_CharT, _Traits, _Allocator>& __rhs)
     _NOEXCEPT_(_NOEXCEPT_(__lhs.swap(__rhs)))
{
    __lhs.swap(__rhs);
}

#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS

typedef basic_string<char16_t> u16string;
typedef basic_string<char32_t> u32string;

#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS

int                stoi  (const string& __str, size_t* __idx = 0, int __base = 10);
long               stol  (const string& __str, size_t* __idx = 0, int __base = 10);
unsigned long      stoul (const string& __str, size_t* __idx = 0, int __base = 10);
long long          stoll (const string& __str, size_t* __idx = 0, int __base = 10);
unsigned long long stoull(const string& __str, size_t* __idx = 0, int __base = 10);

float       stof (const string& __str, size_t* __idx = 0);
double      stod (const string& __str, size_t* __idx = 0);
long double stold(const string& __str, size_t* __idx = 0);

string to_string(int __val);
string to_string(unsigned __val);
string to_string(long __val);
string to_string(unsigned long __val);
string to_string(long long __val);
string to_string(unsigned long long __val);
string to_string(float __val);
string to_string(double __val);
string to_string(long double __val);

int                stoi  (const wstring& __str, size_t* __idx = 0, int __base = 10);
long               stol  (const wstring& __str, size_t* __idx = 0, int __base = 10);
unsigned long      stoul (const wstring& __str, size_t* __idx = 0, int __base = 10);
long long          stoll (const wstring& __str, size_t* __idx = 0, int __base = 10);
unsigned long long stoull(const wstring& __str, size_t* __idx = 0, int __base = 10);

float       stof (const wstring& __str, size_t* __idx = 0);
double      stod (const wstring& __str, size_t* __idx = 0);
long double stold(const wstring& __str, size_t* __idx = 0);

wstring to_wstring(int __val);
wstring to_wstring(unsigned __val);
wstring to_wstring(long __val);
wstring to_wstring(unsigned long __val);
wstring to_wstring(long long __val);
wstring to_wstring(unsigned long long __val);
wstring to_wstring(float __val);
wstring to_wstring(double __val);
wstring to_wstring(long double __val);

template<class _CharT, class _Traits, class _Allocator>
    const typename basic_string<_CharT, _Traits, _Allocator>::size_type
                   basic_string<_CharT, _Traits, _Allocator>::npos;

template<class _Ptr>
size_t _LIBCPP_INLINE_VISIBILITY __do_string_hash(_Ptr __p, _Ptr __e)
{
    typedef typename iterator_traits<_Ptr>::value_type value_type;
    return __murmur2_or_cityhash<size_t>()(__p, (__e-__p)*sizeof(value_type));
}

template<class _CharT, class _Traits, class _Allocator>
struct _LIBCPP_VISIBLE hash<basic_string<_CharT, _Traits, _Allocator> >
    : public unary_function<basic_string<_CharT, _Traits, _Allocator>, size_t>
{
    size_t
        operator()(const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT;
};

template<class _CharT, class _Traits, class _Allocator>
size_t
hash<basic_string<_CharT, _Traits, _Allocator> >::operator()(
        const basic_string<_CharT, _Traits, _Allocator>& __val) const _NOEXCEPT
{
    return __do_string_hash(__val.data(), __val.data() + __val.size());
}

template<class _CharT, class _Traits, class _Allocator>
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os,
           const basic_string<_CharT, _Traits, _Allocator>& __str);

template<class _CharT, class _Traits, class _Allocator>
basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is,
           basic_string<_CharT, _Traits, _Allocator>& __str);

template<class _CharT, class _Traits, class _Allocator>
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str);

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm);

template<class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is,
        basic_string<_CharT, _Traits, _Allocator>& __str);

#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES

extern template class basic_string<char>;
extern template class basic_string<wchar_t>;

extern template
    string
    operator+<char, char_traits<char>, allocator<char> >(char const*, string const&);

_LIBCPP_END_NAMESPACE_STD

#endif  // _LIBCPP_STRING
@


1.2.2.3
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 243376
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r243376 | dim | 2012-11-21 18:38:56 +0000 (Wed, 21 Nov 2012) | 14 lines
## SVN ##
## SVN ## MFC r241903:
## SVN ##
## SVN ##   Import libc++ trunk r165949.  Among other improvements and bug fixes,
## SVN ##   this has many visibility problems fixed, which should help with
## SVN ##   compiling certain ports that exercise C++11 mode (i.e. Firefox).
## SVN ##
## SVN ##   Also, belatedly add the LICENSE.TXT and accompanying CREDITS.TXT files,
## SVN ##   which are referred to in all the source files.
## SVN ##
## SVN ## MFC r241907:
## SVN ##
## SVN ##   Fix two -Wsystem-header warnings in libc++ that were exposed by the new
## SVN ##   ATF import.  These have also been sent upstream.
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d54 2
a55 2
    static constexpr bool eq(char_type c1, char_type c2) noexcept;
    static constexpr bool lt(char_type c1, char_type c2) noexcept;
d64 5
a68 5
    static constexpr int_type  not_eof(int_type c) noexcept;
    static constexpr char_type to_char_type(int_type c) noexcept;
    static constexpr int_type  to_int_type(char_type c) noexcept;
    static constexpr bool      eq_int_type(int_type c1, int_type c2) noexcept;
    static constexpr int_type  eof() noexcept;
d509 1
a509 1
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d512 1
a512 1
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d522 1
a522 2
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
d525 1
a525 1
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
d528 1
a528 1
    static _LIBCPP_CONSTEXPR int_type  to_int_type(char_type __c) _NOEXCEPT
d531 1
a531 1
    static _LIBCPP_CONSTEXPR bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d534 1
a534 1
    static _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
d634 1
a634 1
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d637 1
a637 1
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d658 1
a658 2
    _LIBCPP_INLINE_VISIBILITY
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
d661 1
a661 1
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
d664 1
a664 1
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
d667 1
a667 1
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d670 1
a670 1
    static _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
d689 1
a689 1
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d692 1
a692 1
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d715 1
a715 1
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
d718 1
a718 1
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
d721 1
a721 1
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
d724 1
a724 1
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d727 1
a727 1
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
d746 1
a746 1
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d749 1
a749 1
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d760 1
a760 1
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
d763 1
a763 1
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
d766 1
a766 1
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
d769 1
a769 1
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d772 1
a772 1
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
d866 1
a866 1
    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
d869 1
a869 1
    static _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
d880 1
a880 1
    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
d883 1
a883 1
    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
d886 1
a886 1
    static _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
d889 1
a889 1
    static _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
d892 1
a892 1
    static _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
a2208 1
    return *this;
@


1.2.2.4
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/243683
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r243683 | dim | 2012-11-29 21:26:57 +0000 (Thu, 29 Nov 2012) | 4 lines
## SVN ##
## SVN ## MFC r242945 (by theraven):
## SVN ##
## SVN ##   Import new version of libc++ into base.
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d1034 1
a1034 1
_LIBCPP_EXTERN_TEMPLATE(class __basic_string_common<true>)
d1097 1
a1097 1
            value_type __lx;
d1102 1
a1102 1
    union __lx{__long __lx; __short __lxx;};
d1104 1
a1104 1
    enum {__n_words = sizeof(__lx) / sizeof(size_type)};
d3978 2
a3979 2
_LIBCPP_EXTERN_TEMPLATE(class basic_string<char>)
_LIBCPP_EXTERN_TEMPLATE(class basic_string<wchar_t>)
@


1.2.2.5
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/250514
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@d460 1
a460 1
class _LIBCPP_TYPE_VIS fpos
d497 1
a497 1
struct _LIBCPP_TYPE_VIS char_traits
d623 1
a623 1
struct _LIBCPP_TYPE_VIS char_traits<char>
d679 1
a679 1
struct _LIBCPP_TYPE_VIS char_traits<wchar_t>
d736 1
a736 1
struct _LIBCPP_TYPE_VIS char_traits<char16_t>
d856 1
a856 1
struct _LIBCPP_TYPE_VIS char_traits<char32_t>
d1040 1
a1040 1
class _LIBCPP_TYPE_VIS basic_string
a1464 5

    _LIBCPP_INLINE_VISIBILITY
    bool __is_long() const _NOEXCEPT
        {return bool(__r_.first().__s.__size_ & __short_mask);}

d1474 4
d3377 1
a3377 1
        for (const_pointer __ps = __p + __pos; __ps != __pe; ++__ps)
d3564 3
a3566 23
    size_t __lhs_sz = __lhs.size();
    return __lhs_sz == __rhs.size() && _Traits::compare(__lhs.data(),
                                                        __rhs.data(),
                                                        __lhs_sz) == 0;
}

template<class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
bool
operator==(const basic_string<char, char_traits<char>, _Allocator>& __lhs,
           const basic_string<char, char_traits<char>, _Allocator>& __rhs) _NOEXCEPT
{
    size_t __lhs_sz = __lhs.size();
    if (__lhs_sz != __rhs.size())
        return false;
    const char* __lp = __lhs.data();
    const char* __rp = __rhs.data();
    if (__lhs.__is_long())
        return char_traits<char>::compare(__lp, __rp, __lhs_sz) == 0;
    for (; __lhs_sz != 0; --__lhs_sz, ++__lp, ++__rp)
        if (*__lp != *__rp)
            return false;
    return true;
d3926 1
a3926 1
struct _LIBCPP_TYPE_VIS hash<basic_string<_CharT, _Traits, _Allocator> >
@


1.2.2.6
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/253222
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@d103 2
a104 2
    basic_string(const value_type* s, const allocator_type& a = allocator_type());
    basic_string(const value_type* s, size_type n, const allocator_type& a = allocator_type());
d120 1
a120 1
    basic_string& operator=(const value_type* s);
d159 1
a159 1
    basic_string& operator+=(const value_type* s);
d165 2
a166 2
    basic_string& append(const value_type* s, size_type n);
    basic_string& append(const value_type* s);
d182 2
a183 2
    basic_string& assign(const value_type* s, size_type n);
    basic_string& assign(const value_type* s);
d192 2
a193 2
    basic_string& insert(size_type pos, const value_type* s, size_type n);
    basic_string& insert(size_type pos, const value_type* s);
d208 2
a209 2
    basic_string& replace(size_type pos, size_type n1, const value_type* s, size_type n2);
    basic_string& replace(size_type pos, size_type n1, const value_type* s);
d212 2
a213 2
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s, size_type n);
    basic_string& replace(const_iterator i1, const_iterator i2, const value_type* s);
d219 1
a219 1
    size_type copy(value_type* s, size_type n, size_type pos = 0) const;
d226 2
a227 2
    const value_type* c_str() const noexcept;
    const value_type* data() const noexcept;
d232 2
a233 2
    size_type find(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find(const value_type* s, size_type pos = 0) const noexcept;
d237 2
a238 2
    size_type rfind(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type rfind(const value_type* s, size_type pos = npos) const noexcept;
d242 2
a243 2
    size_type find_first_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_first_of(const value_type* s, size_type pos = 0) const noexcept;
d247 2
a248 2
    size_type find_last_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_last_of(const value_type* s, size_type pos = npos) const noexcept;
d252 2
a253 2
    size_type find_first_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_first_not_of(const value_type* s, size_type pos = 0) const noexcept;
d257 2
a258 2
    size_type find_last_not_of(const value_type* s, size_type pos, size_type n) const noexcept;
    size_type find_last_not_of(const value_type* s, size_type pos = npos) const noexcept;
d265 3
a267 3
    int compare(const value_type* s) const noexcept;
    int compare(size_type pos1, size_type n1, const value_type* s) const;
    int compare(size_type pos1, size_type n1, const value_type* s, size_type n2) const;
a1038 15
#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

template <class _CharT, size_t = sizeof(_CharT)>
struct __padding
{
    unsigned char __xx[sizeof(_CharT)-1];
};

template <class _CharT>
struct __padding<_CharT, 1>
{
};

#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

a1071 33

#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

    struct __long
    {
        pointer   __data_;
        size_type __size_;
        size_type __cap_;
    };

#if _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x01};
    enum {__long_mask  = 0x1ul};
#else  // _LIBCPP_BIG_ENDIAN
    enum {__short_mask = 0x80};
    enum {__long_mask  = ~(size_type(~0) >> 1)};
#endif  // _LIBCPP_BIG_ENDIAN

    enum {__min_cap = (sizeof(__long) - 1)/sizeof(value_type) > 2 ?
                      (sizeof(__long) - 1)/sizeof(value_type) : 2};

    struct __short
    {
        value_type __data_[__min_cap];
        struct
            : __padding<value_type>
        {
            unsigned char __size_;
        };
    };

#else

d1087 2
a1101 2
#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

d1147 1
a1147 1
    _LIBCPP_INLINE_VISIBILITY basic_string(const value_type* __s);
d1149 1
a1149 1
    basic_string(const value_type* __s, const allocator_type& __a);
d1151 1
a1151 1
    basic_string(const value_type* __s, size_type __n);
d1153 1
a1153 1
    basic_string(const value_type* __s, size_type __n, const allocator_type& __a);
d1182 1
a1182 1
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const value_type* __s) {return assign(__s);}
d1195 1
a1195 1
        {return const_iterator(__get_pointer());}
d1201 1
a1201 1
        {return const_iterator(__get_pointer() + size());}
d1258 1
a1258 1
    _LIBCPP_INLINE_VISIBILITY basic_string& operator+=(const value_type* __s)         {return append(__s);}
d1267 2
a1268 2
    basic_string& append(const value_type* __s, size_type __n);
    basic_string& append(const value_type* __s);
d1306 2
a1307 2
    basic_string& assign(const value_type* __s, size_type __n);
    basic_string& assign(const value_type* __s);
d1332 2
a1333 2
    basic_string& insert(size_type __pos, const value_type* __s, size_type __n);
    basic_string& insert(size_type __pos, const value_type* __s);
d1368 2
a1369 2
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2);
    basic_string& replace(size_type __pos, size_type __n1, const value_type* __s);
d1374 1
a1374 1
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n);
d1376 1
a1376 1
    basic_string& replace(const_iterator __i1, const_iterator __i2, const value_type* __s);
d1392 1
a1392 1
    size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const;
d1402 1
a1402 1
    const value_type* c_str() const _NOEXCEPT {return data();}
d1404 1
a1404 1
    const value_type* data() const _NOEXCEPT  {return _VSTD::__to_raw_pointer(__get_pointer());}
d1411 1
a1411 1
    size_type find(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1413 1
a1413 1
    size_type find(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
d1418 1
a1418 1
    size_type rfind(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1420 1
a1420 1
    size_type rfind(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
d1425 1
a1425 1
    size_type find_first_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1427 1
a1427 1
    size_type find_first_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
d1433 1
a1433 1
    size_type find_last_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1435 1
a1435 1
    size_type find_last_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
d1441 1
a1441 1
    size_type find_first_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1443 1
a1443 1
    size_type find_first_not_of(const value_type* __s, size_type __pos = 0) const _NOEXCEPT;
d1449 1
a1449 1
    size_type find_last_not_of(const value_type* __s, size_type __pos, size_type __n) const _NOEXCEPT;
d1451 1
a1451 1
    size_type find_last_not_of(const value_type* __s, size_type __pos = npos) const _NOEXCEPT;
d1460 3
a1462 3
    int compare(const value_type* __s) const _NOEXCEPT;
    int compare(size_type __pos1, size_type __n1, const value_type* __s) const;
    int compare(size_type __pos1, size_type __n1, const value_type* __s, size_type __n2) const;
a1477 2
#ifdef _LIBCPP_ALTERNATE_STRING_LAYOUT

d1480 1
a1480 3
#   if _LIBCPP_BIG_ENDIAN
        {__r_.first().__s.__size_ = (unsigned char)(__s << 1);}
#   else
d1482 1
a1482 17
#   endif

    _LIBCPP_INLINE_VISIBILITY
    size_type __get_short_size() const _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {return __r_.first().__s.__size_ >> 1;}
#   else
        {return __r_.first().__s.__size_;}
#   endif

#else  // _LIBCPP_ALTERNATE_STRING_LAYOUT

    _LIBCPP_INLINE_VISIBILITY
    void __set_short_size(size_type __s) _NOEXCEPT
#   if _LIBCPP_BIG_ENDIAN
        {__r_.first().__s.__size_ = (unsigned char)(__s);}
#   else
d1484 1
a1484 2
#   endif

d1487 1
a1487 1
#   if _LIBCPP_BIG_ENDIAN
d1489 1
a1489 1
#   else
d1491 1
a1491 4
#   endif

#endif  // _LIBCPP_ALTERNATE_STRING_LAYOUT

d1520 1
a1520 1
        {return pointer_traits<pointer>::pointer_to(__r_.first().__s.__data_[0]);}
d1523 1
a1523 1
        {return pointer_traits<const_pointer>::pointer_to(__r_.first().__s.__data_[0]);}
d1550 2
a1551 2
    void __init(const value_type* __s, size_type __sz, size_type __reserve);
    void __init(const value_type* __s, size_type __sz);
d1575 1
a1575 1
                               size_type __n_add, const value_type* __p_new_stuff);
d1732 1
a1732 1
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz, size_type __reserve)
d1750 1
a1750 1
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
d1756 1
a1756 1
basic_string<_CharT, _Traits, _Allocator>::__init(const value_type* __s, size_type __sz)
d1774 1
a1774 1
    traits_type::copy(_VSTD::__to_raw_pointer(__p), __s, __sz);
d1780 1
a1780 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s)
d1790 1
a1790 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, const allocator_type& __a)
d1801 1
a1801 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n)
d1811 1
a1811 1
basic_string<_CharT, _Traits, _Allocator>::basic_string(const value_type* __s, size_type __n, const allocator_type& __a)
d1827 1
a1827 1
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
d1837 1
a1837 1
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
d1862 1
a1862 1
        __init(_VSTD::__to_raw_pointer(__str.__get_long_pointer()), __str.__get_long_size());
d1891 1
a1891 1
    traits_type::assign(_VSTD::__to_raw_pointer(__p), __n, __c);
d2029 1
a2029 1
     size_type __n_copy,  size_type __n_del,     size_type __n_add, const value_type* __p_new_stuff)
d2041 1
a2041 2
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
d2043 1
a2043 1
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy, __p_new_stuff, __n_add);
d2046 1
a2046 2
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del, __sec_cp_sz);
d2071 1
a2071 2
        traits_type::copy(_VSTD::__to_raw_pointer(__p),
                          _VSTD::__to_raw_pointer(__old_p), __n_copy);
d2074 1
a2074 3
        traits_type::copy(_VSTD::__to_raw_pointer(__p) + __n_copy + __n_add,
                          _VSTD::__to_raw_pointer(__old_p) + __n_copy + __n_del,
                          __sec_cp_sz);
d2085 1
a2085 1
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s, size_type __n)
d2093 1
a2093 1
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2119 1
a2119 1
    value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2261 1
a2261 1
basic_string<_CharT, _Traits, _Allocator>::assign(const value_type* __s)
d2273 1
a2273 1
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s, size_type __n)
d2284 1
a2284 1
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2307 1
a2307 1
        traits_type::assign(_VSTD::__to_raw_pointer(__p) + __sz, __n, __c);
d2319 2
a2320 13
    bool __is_short = !__is_long();
    size_type __cap;
    size_type __sz;
    if (__is_short)
    {
        __cap = __min_cap - 1;
        __sz = __get_short_size();
    }
    else
    {
        __cap = __get_long_cap() - 1;
        __sz = __get_long_size();
    }
a2321 1
    {
d2323 1
a2323 13
        __is_short = !__is_long();
    }
    pointer __p;
    if (__is_short)
    {
        __p = __get_short_pointer() + __sz;
        __set_short_size(__sz+1);
    }
    else
    {
        __p = __get_long_pointer() + __sz;
        __set_long_size(__sz+1);
    }
d2326 1
d2389 1
a2389 1
basic_string<_CharT, _Traits, _Allocator>::append(const value_type* __s)
d2401 1
a2401 1
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s, size_type __n)
d2414 1
a2414 1
            value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2443 1
a2443 1
        value_type* __p;
d2446 1
a2446 1
            __p = _VSTD::__to_raw_pointer(__get_pointer());
d2454 1
a2454 1
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
d2498 1
a2498 1
        value_type* __p;
d2501 1
a2501 1
            __p = _VSTD::__to_raw_pointer(__get_pointer());
d2509 1
a2509 1
            __p = _VSTD::__to_raw_pointer(__get_long_pointer());
d2541 1
a2541 1
basic_string<_CharT, _Traits, _Allocator>::insert(size_type __pos, const value_type* __s)
d2556 1
a2556 1
    value_type* __p;
d2560 1
a2560 1
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
d2564 1
a2564 1
        __p = _VSTD::__to_raw_pointer(__get_pointer());
d2589 1
a2589 1
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s, size_type __n2)
d2601 1
a2601 1
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2650 1
a2650 1
    value_type* __p;
d2653 1
a2653 1
        __p = _VSTD::__to_raw_pointer(__get_pointer());
d2664 1
a2664 1
        __p = _VSTD::__to_raw_pointer(__get_long_pointer());
d2723 1
a2723 1
basic_string<_CharT, _Traits, _Allocator>::replace(size_type __pos, size_type __n1, const value_type* __s)
d2743 1
a2743 1
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s, size_type __n)
d2751 1
a2751 1
basic_string<_CharT, _Traits, _Allocator>::replace(const_iterator __i1, const_iterator __i2, const value_type* __s)
d2775 1
a2775 1
        value_type* __p = _VSTD::__to_raw_pointer(__get_pointer());
d2933 1
a2933 1
                if (__new_data == nullptr)
d2941 1
a2941 2
        traits_type::copy(_VSTD::__to_raw_pointer(__new_data),
                          _VSTD::__to_raw_pointer(__p), size()+1);
d3042 1
a3042 1
basic_string<_CharT, _Traits, _Allocator>::copy(value_type* __s, size_type __n, size_type __pos) const
d3088 1
a3088 1
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
d3100 2
a3101 2
    const value_type* __p = data();
    const value_type* __r = _VSTD::search(__p + __pos, __p + __sz, __s, __s + __n,
d3120 1
a3120 1
basic_string<_CharT, _Traits, _Allocator>::find(const value_type* __s,
d3137 2
a3138 2
    const value_type* __p = data();
    const value_type* __r = traits_type::find(__p + __pos, __sz - __pos, __c);
d3148 1
a3148 1
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
d3161 2
a3162 2
    const value_type* __p = data();
    const value_type* __r = _VSTD::find_end(__p, __p + __pos, __s, __s + __n,
d3181 1
a3181 1
basic_string<_CharT, _Traits, _Allocator>::rfind(const value_type* __s,
d3202 2
a3203 2
        const value_type* __p = data();
        for (const value_type* __ps = __p + __pos; __ps != __p;)
d3216 1
a3216 1
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
d3226 2
a3227 2
    const value_type* __p = data();
    const value_type* __r = _VSTD::find_first_of(__p + __pos, __p + __sz, __s,
d3246 1
a3246 1
basic_string<_CharT, _Traits, _Allocator>::find_first_of(const value_type* __s,
d3268 1
a3268 1
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
d3282 2
a3283 2
        const value_type* __p = data();
        for (const value_type* __ps = __p + __pos; __ps != __p;)
d3285 1
a3285 1
            const value_type* __r = traits_type::find(__s, __n, *--__ps);
d3305 1
a3305 1
basic_string<_CharT, _Traits, _Allocator>::find_last_of(const value_type* __s,
d3327 1
a3327 1
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
d3337 3
a3339 3
        const value_type* __p = data();
        const value_type* __pe = __p + __sz;
        for (const value_type* __ps = __p + __pos; __ps != __pe; ++__ps)
d3358 1
a3358 1
basic_string<_CharT, _Traits, _Allocator>::find_first_not_of(const value_type* __s,
d3376 3
a3378 3
        const value_type* __p = data();
        const value_type* __pe = __p + __sz;
        for (const value_type* __ps = __p + __pos; __ps != __pe; ++__ps)
d3389 1
a3389 1
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
d3401 2
a3402 2
    const value_type* __p = data();
    for (const value_type* __ps = __p + __pos; __ps != __p;)
d3420 1
a3420 1
basic_string<_CharT, _Traits, _Allocator>::find_last_not_of(const value_type* __s,
d3440 2
a3441 2
    const value_type* __p = data();
    for (const value_type* __ps = __p + __pos; __ps != __p;)
d3494 1
a3494 1
basic_string<_CharT, _Traits, _Allocator>::compare(const value_type* __s) const _NOEXCEPT
d3506 1
a3506 1
                                                   const value_type* __s) const
d3518 1
a3518 1
                                                   const value_type* __s,
@


1.2.2.7
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/262801
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a424 5
basic_string<char>     operator "" s( const char *str,     size_t len ); // C++14
basic_string<wchar_t>  operator "" s( const wchar_t *str,  size_t len ); // C++14
basic_string<char16_t> operator "" s( const char16_t *str, size_t len ); // C++14
basic_string<char32_t> operator "" s( const char32_t *str, size_t len ); // C++14

d445 1
a445 1
#if defined(_LIBCPP_NO_EXCEPTIONS)
d460 1
a460 1
class _LIBCPP_TYPE_VIS_ONLY fpos
d497 1
a497 1
struct _LIBCPP_TYPE_VIS_ONLY char_traits
a602 1
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
d623 1
a623 1
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char>
d654 1
a654 4
        {
            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
            return (char_type*)memcpy(__s1, __s2, __n);
        }
d679 1
a679 1
struct _LIBCPP_TYPE_VIS_ONLY char_traits<wchar_t>
d711 1
a711 4
        {
            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
            return (char_type*)wmemcpy(__s1, __s2, __n);
        }
d736 1
a736 1
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char16_t>
a838 1
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
d856 1
a856 1
struct _LIBCPP_TYPE_VIS_ONLY char_traits<char32_t>
a958 1
    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
d1001 1
a1001 1
class _LIBCPP_TYPE_VIS_ONLY __basic_string_common
d1030 1
a1030 1
#ifdef _LIBCPP_MSVC
d1033 3
a1035 3
#endif // _LIBCPP_MSVC
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS __basic_string_common<true>)
#ifdef _LIBCPP_MSVC
d1037 1
a1037 1
#endif // _LIBCPP_MSVC
d1055 1
a1055 1
class _LIBCPP_TYPE_VIS_ONLY basic_string
d1070 7
a1076 7

    static_assert(is_pod<value_type>::value, "Character type of basic_string must be a POD");
    static_assert((is_same<_CharT, value_type>::value),
                  "traits_type::char_type must be the same type as CharT");
    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
                  "Allocator::value_type must be same type as value_type");
#if defined(_LIBCPP_RAW_ITERATORS)
d1150 1
a1150 1
    union __ulx{__long __lx; __short __lxx;};
d1152 1
a1152 1
    enum {__n_words = sizeof(__ulx) / sizeof(size_type)};
d1171 9
d1237 1
a1237 14
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_INLINE_VISIBILITY
    iterator begin() _NOEXCEPT
        {return iterator(this, __get_pointer());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator begin() const _NOEXCEPT
        {return const_iterator(this, __get_pointer());}
    _LIBCPP_INLINE_VISIBILITY
    iterator end() _NOEXCEPT
        {return iterator(this, __get_pointer() + size());}
    _LIBCPP_INLINE_VISIBILITY
    const_iterator end() const _NOEXCEPT
        {return const_iterator(this, __get_pointer() + size());}
#else
d1250 6
a1255 1
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
a1517 9
#if _LIBCPP_DEBUG_LEVEL >= 2

    bool __dereferenceable(const const_iterator* __i) const;
    bool __decrementable(const const_iterator* __i) const;
    bool __addable(const const_iterator* __i, ptrdiff_t __n) const;
    bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const;

#endif  // _LIBCPP_DEBUG_LEVEL >= 2

d1613 1
a1613 1
        size_type __align_it(size_type __s) _NOEXCEPT
d1619 1
a1619 1
                 __align_it<sizeof(value_type) < __alignment ?
d1730 3
a1732 1
inline _LIBCPP_INLINE_VISIBILITY
d1736 4
a1739 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__invalidate_all(this);
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
d1743 3
a1745 1
inline _LIBCPP_INLINE_VISIBILITY
d1748 1
a1748 1
#if _LIBCPP_DEBUG_LEVEL >= 2
d1753 7
a1759 10
#if _LIBCPP_DEBUG_LEVEL >= 2
    __c_node* __c = __get_db()->__find_c_and_lock(this);
    if (__c)
    {
        const_pointer __new_last = __get_pointer() + __pos;
        for (__i_node** __p = __c->end_; __p != __c->beg_; )
        {
            --__p;
            const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
            if (__i->base() > __new_last)
d1761 3
a1763 3
                (*__p)->__c_ = nullptr;
                if (--__c->end_ != __p)
                    memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
d1765 16
a1781 1
        __get_db()->unlock();
d1783 1
a1783 1
#endif  // _LIBCPP_DEBUG_LEVEL >= 2
d1787 1
a1787 1
inline _LIBCPP_INLINE_VISIBILITY
a1790 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1795 1
a1795 1
inline _LIBCPP_INLINE_VISIBILITY
a1798 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1851 1
a1851 1
inline _LIBCPP_INLINE_VISIBILITY
d1854 3
a1856 1
    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*) detected nullptr");
a1857 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1861 1
a1861 1
inline _LIBCPP_INLINE_VISIBILITY
d1865 3
a1867 1
    _LIBCPP_ASSERT(__s != nullptr, "basic_string(const char*, allocator) detected nullptr");
a1868 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1872 1
a1872 1
inline _LIBCPP_INLINE_VISIBILITY
d1875 3
a1877 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "basic_string(const char*, n) detected nullptr");
a1878 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1882 1
a1882 1
inline _LIBCPP_INLINE_VISIBILITY
d1886 3
a1888 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "basic_string(const char*, n, allocator) detected nullptr");
a1889 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
a1899 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
a1909 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1915 1
a1915 1
inline _LIBCPP_INLINE_VISIBILITY
d1921 2
a1922 4
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
    if (__is_long())
        __get_db()->swap(this, &__str);
d1927 1
a1927 1
inline _LIBCPP_INLINE_VISIBILITY
d1936 2
a1937 4
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
    if (__is_long())
        __get_db()->swap(this, &__str);
d1968 1
a1968 1
inline _LIBCPP_INLINE_VISIBILITY
a1971 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d1975 1
a1975 1
inline _LIBCPP_INLINE_VISIBILITY
a1979 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
a1990 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d2054 1
a2054 1
inline _LIBCPP_INLINE_VISIBILITY
a2057 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d2062 1
a2062 1
inline _LIBCPP_INLINE_VISIBILITY
a2067 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d2073 1
a2073 1
inline _LIBCPP_INLINE_VISIBILITY
a2076 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d2080 1
a2080 1
inline _LIBCPP_INLINE_VISIBILITY
a2084 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__insert_c(this);
#endif
d2092 1
a2092 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    __get_db()->__erase_c(this);
#endif
d2136 1
a2136 1
    if (__delta_cap > __ms - __old_cap)
d2164 3
a2166 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::assign recieved nullptr");
d2239 1
a2239 1
inline _LIBCPP_INLINE_VISIBILITY
d2250 1
a2250 1
inline _LIBCPP_INLINE_VISIBILITY
d2263 1
a2263 1
inline _LIBCPP_INLINE_VISIBILITY
d2319 1
a2319 1
inline _LIBCPP_INLINE_VISIBILITY
d2340 3
a2342 1
    _LIBCPP_ASSERT(__s != nullptr, "string::assign recieved nullptr");
d2352 3
a2354 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::append recieved nullptr");
d2470 1
a2470 1
inline _LIBCPP_INLINE_VISIBILITY
d2491 3
a2493 1
    _LIBCPP_ASSERT(__s != nullptr, "string::append recieved nullptr");
d2503 3
a2505 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::insert recieved nullptr");
a2573 5
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
        "string::insert(iterator, range) called with an iterator not"
        " referring to this string");
#endif
a2579 3
#if _LIBCPP_DEBUG_LEVEL >= 2
    return iterator(this, __p + __ip);
#else
a2580 1
#endif
a2591 5
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
        "string::insert(iterator, range) called with an iterator not"
        " referring to this string");
#endif
d2621 1
a2621 1
inline _LIBCPP_INLINE_VISIBILITY
d2643 3
a2645 1
    _LIBCPP_ASSERT(__s != nullptr, "string::insert recieved nullptr");
d2676 1
a2676 1
inline _LIBCPP_INLINE_VISIBILITY
a2679 5
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
        "string::insert(iterator, n, value) called with an iterator not"
        " referring to this string");
#endif
d2691 3
a2693 1
    _LIBCPP_ASSERT(__n2 == 0 || __s != nullptr, "string::replace recieved nullptr");
d2803 1
a2803 1
inline _LIBCPP_INLINE_VISIBILITY
d2825 3
a2827 1
    _LIBCPP_ASSERT(__s != nullptr, "string::replace recieved nullptr");
d2832 1
a2832 1
inline _LIBCPP_INLINE_VISIBILITY
d2841 1
a2841 1
inline _LIBCPP_INLINE_VISIBILITY
d2849 1
a2849 1
inline _LIBCPP_INLINE_VISIBILITY
d2857 1
a2857 1
inline _LIBCPP_INLINE_VISIBILITY
d2889 1
a2889 1
inline _LIBCPP_INLINE_VISIBILITY
a2892 7
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__pos) == this,
        "string::erase(iterator) called with an iterator not"
        " referring to this string");
#endif
    _LIBCPP_ASSERT(__pos != end(),
        "string::erase(iterator) called with a non-dereferenceable iterator");
d2900 1
a2900 1
inline _LIBCPP_INLINE_VISIBILITY
a2903 6
#if _LIBCPP_DEBUG_LEVEL >= 2
    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__first) == this,
        "string::erase(iterator,  iterator) called with an iterator not"
        " referring to this string");
#endif
    _LIBCPP_ASSERT(__first <= __last, "string::erase(first, last) called with invalid range");
d2911 1
a2911 1
inline _LIBCPP_INLINE_VISIBILITY
d2915 3
a2917 1
    _LIBCPP_ASSERT(!empty(), "string::pop_back(): string is already empty");
d2935 1
a2935 1
inline _LIBCPP_INLINE_VISIBILITY
d2953 1
a2953 1
inline _LIBCPP_INLINE_VISIBILITY
d2982 1
a2982 1
inline _LIBCPP_INLINE_VISIBILITY
d2988 1
a2988 1
    return (__m <= ~__long_mask ? __m : __m/2) - __alignment;
d2990 1
a2990 1
    return __m - __alignment;
d3058 1
a3058 1
inline _LIBCPP_INLINE_VISIBILITY
d3062 3
a3064 1
    _LIBCPP_ASSERT(__pos <= size(), "string index out of bounds");
d3069 1
a3069 1
inline _LIBCPP_INLINE_VISIBILITY
d3073 3
a3075 1
    _LIBCPP_ASSERT(__pos <= size(), "string index out of bounds");
d3098 1
a3098 1
inline _LIBCPP_INLINE_VISIBILITY
d3102 3
a3104 1
    _LIBCPP_ASSERT(!empty(), "string::front(): string is empty");
d3109 1
a3109 1
inline _LIBCPP_INLINE_VISIBILITY
d3113 3
a3115 1
    _LIBCPP_ASSERT(!empty(), "string::front(): string is empty");
d3120 1
a3120 1
inline _LIBCPP_INLINE_VISIBILITY
d3124 3
a3126 1
    _LIBCPP_ASSERT(!empty(), "string::back(): string is empty");
d3131 1
a3131 1
inline _LIBCPP_INLINE_VISIBILITY
d3135 3
a3137 1
    _LIBCPP_ASSERT(!empty(), "string::back(): string is empty");
d3154 1
a3154 1
inline _LIBCPP_INLINE_VISIBILITY
d3162 1
a3162 1
inline _LIBCPP_INLINE_VISIBILITY
a3167 7
#if _LIBCPP_DEBUG_LEVEL >= 2
    if (!__is_long())
        __get_db()->__invalidate_all(this);
    if (!__str.__is_long())
        __get_db()->__invalidate_all(&__str);
    __get_db()->swap(this, &__str);
#endif
d3170 4
d3193 3
a3195 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find(): recieved nullptr");
d3210 1
a3210 1
inline _LIBCPP_INLINE_VISIBILITY
d3219 1
a3219 1
inline _LIBCPP_INLINE_VISIBILITY
d3224 3
a3226 1
    _LIBCPP_ASSERT(__s != nullptr, "string::find(): recieved nullptr");
d3253 3
a3255 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::rfind(): recieved nullptr");
d3271 1
a3271 1
inline _LIBCPP_INLINE_VISIBILITY
d3280 1
a3280 1
inline _LIBCPP_INLINE_VISIBILITY
d3285 3
a3287 1
    _LIBCPP_ASSERT(__s != nullptr, "string::rfind(): recieved nullptr");
d3321 3
a3323 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_first_of(): recieved nullptr");
d3336 1
a3336 1
inline _LIBCPP_INLINE_VISIBILITY
d3345 1
a3345 1
inline _LIBCPP_INLINE_VISIBILITY
d3350 3
a3352 1
    _LIBCPP_ASSERT(__s != nullptr, "string::find_first_of(): recieved nullptr");
d3357 1
a3357 1
inline _LIBCPP_INLINE_VISIBILITY
d3373 3
a3375 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_last_of(): recieved nullptr");
d3395 1
a3395 1
inline _LIBCPP_INLINE_VISIBILITY
d3404 1
a3404 1
inline _LIBCPP_INLINE_VISIBILITY
d3409 3
a3411 1
    _LIBCPP_ASSERT(__s != nullptr, "string::find_last_of(): recieved nullptr");
d3416 1
a3416 1
inline _LIBCPP_INLINE_VISIBILITY
d3432 3
a3434 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_first_not_of(): recieved nullptr");
d3448 1
a3448 1
inline _LIBCPP_INLINE_VISIBILITY
d3457 1
a3457 1
inline _LIBCPP_INLINE_VISIBILITY
d3462 3
a3464 1
    _LIBCPP_ASSERT(__s != nullptr, "string::find_first_not_of(): recieved nullptr");
d3469 1
a3469 1
inline _LIBCPP_INLINE_VISIBILITY
d3494 3
a3496 1
    _LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string::find_last_not_of(): recieved nullptr");
d3510 1
a3510 1
inline _LIBCPP_INLINE_VISIBILITY
d3519 1
a3519 1
inline _LIBCPP_INLINE_VISIBILITY
d3524 3
a3526 1
    _LIBCPP_ASSERT(__s != nullptr, "string::find_last_not_of(): recieved nullptr");
d3531 1
a3531 1
inline _LIBCPP_INLINE_VISIBILITY
d3551 1
a3551 1
inline _LIBCPP_INLINE_VISIBILITY
d3569 1
a3569 1
inline _LIBCPP_INLINE_VISIBILITY
d3597 3
a3599 1
    _LIBCPP_ASSERT(__s != nullptr, "string::compare(): recieved nullptr");
d3609 3
a3611 1
    _LIBCPP_ASSERT(__s != nullptr, "string::compare(): recieved nullptr");
d3622 3
a3624 1
    _LIBCPP_ASSERT(__n2 == 0 || __s != nullptr, "string::compare(): recieved nullptr");
d3643 1
a3643 1
inline _LIBCPP_INLINE_VISIBILITY
d3661 1
a3661 1
inline _LIBCPP_INLINE_VISIBILITY
d3673 1
a3673 1
inline _LIBCPP_INLINE_VISIBILITY
d3692 1
a3692 1
inline _LIBCPP_INLINE_VISIBILITY
d3701 1
a3701 1
inline _LIBCPP_INLINE_VISIBILITY
d3712 1
a3712 1
inline _LIBCPP_INLINE_VISIBILITY
d3721 1
a3721 1
inline _LIBCPP_INLINE_VISIBILITY
d3730 1
a3730 1
inline _LIBCPP_INLINE_VISIBILITY
d3741 1
a3741 1
inline _LIBCPP_INLINE_VISIBILITY
d3750 1
a3750 1
inline _LIBCPP_INLINE_VISIBILITY
d3759 1
a3759 1
inline _LIBCPP_INLINE_VISIBILITY
d3770 1
a3770 1
inline _LIBCPP_INLINE_VISIBILITY
d3779 1
a3779 1
inline _LIBCPP_INLINE_VISIBILITY
d3788 1
a3788 1
inline _LIBCPP_INLINE_VISIBILITY
d3799 1
a3799 1
inline _LIBCPP_INLINE_VISIBILITY
d3808 1
a3808 1
inline _LIBCPP_INLINE_VISIBILITY
d3817 1
a3817 1
inline _LIBCPP_INLINE_VISIBILITY
d3828 1
a3828 1
inline _LIBCPP_INLINE_VISIBILITY
d3837 1
a3837 1
inline _LIBCPP_INLINE_VISIBILITY
d3846 1
a3846 1
inline _LIBCPP_INLINE_VISIBILITY
d3918 1
a3918 1
inline _LIBCPP_INLINE_VISIBILITY
d3926 1
a3926 1
inline _LIBCPP_INLINE_VISIBILITY
d3934 1
a3934 1
inline _LIBCPP_INLINE_VISIBILITY
d3942 1
a3942 1
inline _LIBCPP_INLINE_VISIBILITY
d3950 1
a3950 1
inline _LIBCPP_INLINE_VISIBILITY
d3959 1
a3959 1
inline _LIBCPP_INLINE_VISIBILITY
d3967 1
a3967 1
inline _LIBCPP_INLINE_VISIBILITY
d3980 1
a3980 1
inline _LIBCPP_INLINE_VISIBILITY
d3996 39
a4034 39
_LIBCPP_FUNC_VIS int                stoi  (const string& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS long               stol  (const string& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS unsigned long      stoul (const string& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS long long          stoll (const string& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS unsigned long long stoull(const string& __str, size_t* __idx = 0, int __base = 10);

_LIBCPP_FUNC_VIS float       stof (const string& __str, size_t* __idx = 0);
_LIBCPP_FUNC_VIS double      stod (const string& __str, size_t* __idx = 0);
_LIBCPP_FUNC_VIS long double stold(const string& __str, size_t* __idx = 0);

_LIBCPP_FUNC_VIS string to_string(int __val);
_LIBCPP_FUNC_VIS string to_string(unsigned __val);
_LIBCPP_FUNC_VIS string to_string(long __val);
_LIBCPP_FUNC_VIS string to_string(unsigned long __val);
_LIBCPP_FUNC_VIS string to_string(long long __val);
_LIBCPP_FUNC_VIS string to_string(unsigned long long __val);
_LIBCPP_FUNC_VIS string to_string(float __val);
_LIBCPP_FUNC_VIS string to_string(double __val);
_LIBCPP_FUNC_VIS string to_string(long double __val);

_LIBCPP_FUNC_VIS int                stoi  (const wstring& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS long               stol  (const wstring& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS unsigned long      stoul (const wstring& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS long long          stoll (const wstring& __str, size_t* __idx = 0, int __base = 10);
_LIBCPP_FUNC_VIS unsigned long long stoull(const wstring& __str, size_t* __idx = 0, int __base = 10);

_LIBCPP_FUNC_VIS float       stof (const wstring& __str, size_t* __idx = 0);
_LIBCPP_FUNC_VIS double      stod (const wstring& __str, size_t* __idx = 0);
_LIBCPP_FUNC_VIS long double stold(const wstring& __str, size_t* __idx = 0);

_LIBCPP_FUNC_VIS wstring to_wstring(int __val);
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned __val);
_LIBCPP_FUNC_VIS wstring to_wstring(long __val);
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned long __val);
_LIBCPP_FUNC_VIS wstring to_wstring(long long __val);
_LIBCPP_FUNC_VIS wstring to_wstring(unsigned long long __val);
_LIBCPP_FUNC_VIS wstring to_wstring(float __val);
_LIBCPP_FUNC_VIS wstring to_wstring(double __val);
_LIBCPP_FUNC_VIS wstring to_wstring(long double __val);
d4048 1
a4048 1
struct _LIBCPP_TYPE_VIS_ONLY hash<basic_string<_CharT, _Traits, _Allocator> >
d4100 2
a4101 68
#if _LIBCPP_DEBUG_LEVEL >= 2

template<class _CharT, class _Traits, class _Allocator>
bool
basic_string<_CharT, _Traits, _Allocator>::__dereferenceable(const const_iterator* __i) const
{
    return this->data() <= _VSTD::__to_raw_pointer(__i->base()) &&
           _VSTD::__to_raw_pointer(__i->base()) < this->data() + this->size();
}

template<class _CharT, class _Traits, class _Allocator>
bool
basic_string<_CharT, _Traits, _Allocator>::__decrementable(const const_iterator* __i) const
{
    return this->data() < _VSTD::__to_raw_pointer(__i->base()) &&
           _VSTD::__to_raw_pointer(__i->base()) <= this->data() + this->size();
}

template<class _CharT, class _Traits, class _Allocator>
bool
basic_string<_CharT, _Traits, _Allocator>::__addable(const const_iterator* __i, ptrdiff_t __n) const
{
    const value_type* __p = _VSTD::__to_raw_pointer(__i->base()) + __n;
    return this->data() <= __p && __p <= this->data() + this->size();
}

template<class _CharT, class _Traits, class _Allocator>
bool
basic_string<_CharT, _Traits, _Allocator>::__subscriptable(const const_iterator* __i, ptrdiff_t __n) const
{
    const value_type* __p = _VSTD::__to_raw_pointer(__i->base()) + __n;
    return this->data() <= __p && __p < this->data() + this->size();
}

#endif  // _LIBCPP_DEBUG_LEVEL >= 2

#if _LIBCPP_STD_VER > 11 
// Literal suffixes for basic_string [basic.string.literals]
inline namespace literals
{
  inline namespace string_literals
  {
    inline _LIBCPP_INLINE_VISIBILITY
    basic_string<char> operator "" s( const char *__str, size_t __len )
    {
        return basic_string<char> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY
    basic_string<wchar_t> operator "" s( const wchar_t *__str, size_t __len )
    {
        return basic_string<wchar_t> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY
    basic_string<char16_t> operator "" s( const char16_t *__str, size_t __len )
    {
        return basic_string<char16_t> (__str, __len);
    }

    inline _LIBCPP_INLINE_VISIBILITY
    basic_string<char32_t> operator "" s( const char32_t *__str, size_t __len )
    {
        return basic_string<char32_t> (__str, __len);
    }
  }
}
#endif
d4103 3
a4105 3
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_string<char>)
_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_TYPE_VIS basic_string<wchar_t>)
_LIBCPP_EXTERN_TEMPLATE(string operator+<char, char_traits<char>, allocator<char> >(char const*, string const&))
@


1.1
log
@SVN rev 227983 on 2011-11-25 20:59:04Z by theraven

Import libc++ / libcxxrt into base.  Not build by default yet (use
MK_LIBCPLUSPLUS=yes to enable).  This is a work-in-progress.  It works for
me, but is not guaranteed to work for anyone else and may eat your dog.

To build C++ using libc++, add -stdlib=libc++ to your CXX and LD flags.

Bug reports welcome, bug fixes even more welcome...

Approved by:	dim (mentor)
@
text
@d449 2
d1082 1
a1082 1
    enum {__long_mask  = 0x1};
d1504 1
a1504 1
        {return __r_.first().__l.__cap_ & ~__long_mask;}
d1594 1
a1594 1
    void __copy_assign_alloc(const basic_string& __str, false_type) _NOEXCEPT
d1622 1
a1622 1
    void __move_assign_alloc(basic_string& __c, false_type)
d1641 1
a1641 1
    static void __swap_alloc(allocator_type& __x, allocator_type& __y, false_type) _NOEXCEPT
d1672 5
a1676 1
basic_string<_CharT, _Traits, _Allocator>::__invalidate_iterators_past(size_type __pos)
d2792 1
a2792 1
    return __b + __r;
d2803 1
a2803 1
    return __b + __r;
d3490 1
a3490 1
basic_string<_CharT, _Traits, _Allocator>::compare(const_pointer __s) const
d3918 2
a3919 10
    size_t __r = 0;
    const size_t __sr = __CHAR_BIT__ * sizeof(size_t) - 8;
    const size_t __m = size_t(0xF) << (__sr + 4);
    for (; __p != __e; ++__p)
    {
        __r = (__r << 4) + *__p;
        size_t __g = __r & __m;
        __r ^= __g | (__g >> __sr);
    }
    return __r;
@

