source: Daodan/MSYS2/mingw32/include/c++/11.2.0/bits/basic_string.tcc

// Components for manipulating sequences of characters -*- C++ -*-

// Copyright (C) 1997-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/basic_string.tcc
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{string}
 */

//
// ISO C++ 14882: 21  Strings library
//

// Written by Jason Merrill based upon the specification by Takanori Adachi
// in ANSI X3J16/94-0013R2.  Rewritten by Nathan Myers to ISO-14882.
// Non-reference-counted implementation written by Paolo Carlini and
// updated by Jonathan Wakely for ISO-14882-2011.

#ifndef _BASIC_STRING_TCC
#define _BASIC_STRING_TCC 1

#pragma GCC system_header

#include <bits/cxxabi_forced.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

#if _GLIBCXX_USE_CXX11_ABI

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

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    swap(basic_string& __s) _GLIBCXX_NOEXCEPT
    {
      if (this == &__s)
        return;

      _Alloc_traits::_S_on_swap(_M_get_allocator(), __s._M_get_allocator());

      if (_M_is_local())
        if (__s._M_is_local())
          {
            if (length() && __s.length())
              {
                _CharT __tmp_data[_S_local_capacity + 1];
                traits_type::copy(__tmp_data, __s._M_local_buf,
                                  _S_local_capacity + 1);
                traits_type::copy(__s._M_local_buf, _M_local_buf,
                                  _S_local_capacity + 1);
                traits_type::copy(_M_local_buf, __tmp_data,
                                  _S_local_capacity + 1);
              }
            else if (__s.length())
              {
                traits_type::copy(_M_local_buf, __s._M_local_buf,
                                  _S_local_capacity + 1);
                _M_length(__s.length());
                __s._M_set_length(0);
                return;
              }
            else if (length())
              {
                traits_type::copy(__s._M_local_buf, _M_local_buf,
                                  _S_local_capacity + 1);
                __s._M_length(length());
                _M_set_length(0);
                return;
              }
          }
        else
          {
            const size_type __tmp_capacity = __s._M_allocated_capacity;
            traits_type::copy(__s._M_local_buf, _M_local_buf,
                              _S_local_capacity + 1);
            _M_data(__s._M_data());
            __s._M_data(__s._M_local_buf);
            _M_capacity(__tmp_capacity);
          }
      else
        {
          const size_type __tmp_capacity = _M_allocated_capacity;
          if (__s._M_is_local())
            {
              traits_type::copy(_M_local_buf, __s._M_local_buf,
                                _S_local_capacity + 1);
              __s._M_data(_M_data());
              _M_data(_M_local_buf);
            }
          else
            {
              pointer __tmp_ptr = _M_data();
              _M_data(__s._M_data());
              __s._M_data(__tmp_ptr);
              _M_capacity(__s._M_allocated_capacity);
            }
          __s._M_capacity(__tmp_capacity);
        }

      const size_type __tmp_length = length();
      _M_length(__s.length());
      __s._M_length(__tmp_length);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::pointer
    basic_string<_CharT, _Traits, _Alloc>::
    _M_create(size_type& __capacity, size_type __old_capacity)
    {
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 83.  String::npos vs. string::max_size()
      if (__capacity > max_size())
        std::__throw_length_error(__N("basic_string::_M_create"));

      // The below implements an exponential growth policy, necessary to
      // meet amortized linear time requirements of the library: see
      // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
      if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
        {
          __capacity = 2 * __old_capacity;
          // Never allocate a string bigger than max_size.
          if (__capacity > max_size())
            __capacity = max_size();
        }

      // NB: Need an array of char_type[__capacity], plus a terminating
      // null char_type() element.
      return _Alloc_traits::allocate(_M_get_allocator(), __capacity + 1);
    }

  // NB: This is the special case for Input Iterators, used in
  // istreambuf_iterators, etc.
  // Input Iterators have a cost structure very different from
  // pointers, calling for a different coding style.
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InIterator>
      void
      basic_string<_CharT, _Traits, _Alloc>::
      _M_construct(_InIterator __beg, _InIterator __end,
                   std::input_iterator_tag)
      {
        size_type __len = 0;
        size_type __capacity = size_type(_S_local_capacity);

        while (__beg != __end && __len < __capacity)
          {
            _M_data()[__len++] = *__beg;
            ++__beg;
          }

        __try
          {
            while (__beg != __end)
              {
                if (__len == __capacity)
                  {
                    // Allocate more space.
                    __capacity = __len + 1;
                    pointer __another = _M_create(__capacity, __len);
                    this->_S_copy(__another, _M_data(), __len);
                    _M_dispose();
                    _M_data(__another);
                    _M_capacity(__capacity);
                  }
                _M_data()[__len++] = *__beg;
                ++__beg;
              }
          }
        __catch(...)
          {
            _M_dispose();
            __throw_exception_again;
          }

        _M_set_length(__len);
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InIterator>
      void
      basic_string<_CharT, _Traits, _Alloc>::
      _M_construct(_InIterator __beg, _InIterator __end,
                   std::forward_iterator_tag)
      {
        // NB: Not required, but considered best practice.
        if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
          std::__throw_logic_error(__N("basic_string::"
                                       "_M_construct null not valid"));

        size_type __dnew = static_cast<size_type>(std::distance(__beg, __end));

        if (__dnew > size_type(_S_local_capacity))
          {
            _M_data(_M_create(__dnew, size_type(0)));
            _M_capacity(__dnew);
          }

        // Check for out_of_range and length_error exceptions.
        __try
          { this->_S_copy_chars(_M_data(), __beg, __end); }
        __catch(...)
          {
            _M_dispose();
            __throw_exception_again;
          }

        _M_set_length(__dnew);
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_construct(size_type __n, _CharT __c)
    {
      if (__n > size_type(_S_local_capacity))
        {
          _M_data(_M_create(__n, size_type(0)));
          _M_capacity(__n);
        }

      if (__n)
        this->_S_assign(_M_data(), __n, __c);

      _M_set_length(__n);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_assign(const basic_string& __str)
    {
      if (this != &__str)
        {
          const size_type __rsize = __str.length();
          const size_type __capacity = capacity();

          if (__rsize > __capacity)
            {
              size_type __new_capacity = __rsize;
              pointer __tmp = _M_create(__new_capacity, __capacity);
              _M_dispose();
              _M_data(__tmp);
              _M_capacity(__new_capacity);
            }

          if (__rsize)
            this->_S_copy(_M_data(), __str._M_data(), __rsize);

          _M_set_length(__rsize);
        }
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    reserve(size_type __res)
    {
      const size_type __capacity = capacity();
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2968. Inconsistencies between basic_string reserve and
      // vector/unordered_map/unordered_set reserve functions
      // P0966 reserve should not shrink
      if (__res <= __capacity)
        return;

      pointer __tmp = _M_create(__res, __capacity);
      this->_S_copy(__tmp, _M_data(), length() + 1);
      _M_dispose();
      _M_data(__tmp);
      _M_capacity(__res);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
              size_type __len2)
    {
      const size_type __how_much = length() - __pos - __len1;

      size_type __new_capacity = length() + __len2 - __len1;
      pointer __r = _M_create(__new_capacity, capacity());

      if (__pos)
        this->_S_copy(__r, _M_data(), __pos);
      if (__s && __len2)
        this->_S_copy(__r + __pos, __s, __len2);
      if (__how_much)
        this->_S_copy(__r + __pos + __len2,
                      _M_data() + __pos + __len1, __how_much);

      _M_dispose();
      _M_data(__r);
      _M_capacity(__new_capacity);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_erase(size_type __pos, size_type __n)
    {
      const size_type __how_much = length() - __pos - __n;

      if (__how_much && __n)
        this->_S_move(_M_data() + __pos, _M_data() + __pos + __n, __how_much);

      _M_set_length(length() - __n);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    reserve()
    {
      if (_M_is_local())
        return;

      const size_type __length = length();
      const size_type __capacity = _M_allocated_capacity;

      if (__length <= size_type(_S_local_capacity))
        {
          this->_S_copy(_M_local_data(), _M_data(), __length + 1);
          _M_destroy(__capacity);
          _M_data(_M_local_data());
        }
#if __cpp_exceptions
      else if (__length < __capacity)
        try
          {
            pointer __tmp
              = _Alloc_traits::allocate(_M_get_allocator(), __length + 1);
            this->_S_copy(__tmp, _M_data(), __length + 1);
            _M_dispose();
            _M_data(__tmp);
            _M_capacity(__length);
          }
        catch (const __cxxabiv1::__forced_unwind&)
          { throw; }
        catch (...)
          { /* swallow the exception */ }
#endif
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    resize(size_type __n, _CharT __c)
    {
      const size_type __size = this->size();
      if (__size < __n)
        this->append(__n - __size, __c);
      else if (__n < __size)
        this->_M_set_length(__n);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_append(const _CharT* __s, size_type __n)
    {
      const size_type __len = __n + this->size();

      if (__len <= this->capacity())
        {
          if (__n)
            this->_S_copy(this->_M_data() + this->size(), __s, __n);
        }
      else
        this->_M_mutate(this->size(), size_type(0), __s, __n);

      this->_M_set_length(__len);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InputIterator>
      basic_string<_CharT, _Traits, _Alloc>&
      basic_string<_CharT, _Traits, _Alloc>::
      _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
                          _InputIterator __k1, _InputIterator __k2,
                          std::__false_type)
      {
        // _GLIBCXX_RESOLVE_LIB_DEFECTS
        // 2788. unintentionally require a default constructible allocator
        const basic_string __s(__k1, __k2, this->get_allocator());
        const size_type __n1 = __i2 - __i1;
        return _M_replace(__i1 - begin(), __n1, __s._M_data(),
                          __s.size());
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
                   _CharT __c)
    {
      _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");

      const size_type __old_size = this->size();
      const size_type __new_size = __old_size + __n2 - __n1;

      if (__new_size <= this->capacity())
        {
          pointer __p = this->_M_data() + __pos1;

          const size_type __how_much = __old_size - __pos1 - __n1;
          if (__how_much && __n1 != __n2)
            this->_S_move(__p + __n2, __p + __n1, __how_much);
        }
      else
        this->_M_mutate(__pos1, __n1, 0, __n2);

      if (__n2)
        this->_S_assign(this->_M_data() + __pos1, __n2, __c);

      this->_M_set_length(__new_size);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
               const size_type __len2)
    {
      _M_check_length(__len1, __len2, "basic_string::_M_replace");

      const size_type __old_size = this->size();
      const size_type __new_size = __old_size + __len2 - __len1;

      if (__new_size <= this->capacity())
        {
          pointer __p = this->_M_data() + __pos;

          const size_type __how_much = __old_size - __pos - __len1;
          if (_M_disjunct(__s))
            {
              if (__how_much && __len1 != __len2)
                this->_S_move(__p + __len2, __p + __len1, __how_much);
              if (__len2)
                this->_S_copy(__p, __s, __len2);
            }
          else
            {
              // Work in-place.
              if (__len2 && __len2 <= __len1)
                this->_S_move(__p, __s, __len2);
              if (__how_much && __len1 != __len2)
                this->_S_move(__p + __len2, __p + __len1, __how_much);
              if (__len2 > __len1)
                {
                  if (__s + __len2 <= __p + __len1)
                    this->_S_move(__p, __s, __len2);
                  else if (__s >= __p + __len1)
                    {
                      // Hint to middle end that __p and __s overlap
                      // (PR 98465).
                      const size_type __poff = (__s - __p) + (__len2 - __len1);
                      this->_S_copy(__p, __p + __poff, __len2);
                    }
                  else
                    {
                      const size_type __nleft = (__p + __len1) - __s;
                      this->_S_move(__p, __s, __nleft);
                      this->_S_copy(__p + __nleft, __p + __len2,
                                    __len2 - __nleft);
                    }
                }
            }
        }
      else
        this->_M_mutate(__pos, __len1, __s, __len2);

      this->_M_set_length(__new_size);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    copy(_CharT* __s, size_type __n, size_type __pos) const
    {
      _M_check(__pos, "basic_string::copy");
      __n = _M_limit(__pos, __n);
      __glibcxx_requires_string_len(__s, __n);
      if (__n)
        _S_copy(__s, _M_data() + __pos, __n);
      // 21.3.5.7 par 3: do not append null.  (good.)
      return __n;
    }

#else  // !_GLIBCXX_USE_CXX11_ABI

  template<typename _CharT, typename _Traits, typename _Alloc>
    const typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_max_size = (((npos - sizeof(_Rep_base))/sizeof(_CharT)) - 1) / 4;

  template<typename _CharT, typename _Traits, typename _Alloc>
    const _CharT
    basic_string<_CharT, _Traits, _Alloc>::
    _Rep::_S_terminal = _CharT();

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

  // Linker sets _S_empty_rep_storage to all 0s (one reference, empty string)
  // at static init time (before static ctors are run).
  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::_Rep::_S_empty_rep_storage[
    (sizeof(_Rep_base) + sizeof(_CharT) + sizeof(size_type) - 1) /
      sizeof(size_type)];

  // NB: This is the special case for Input Iterators, used in
  // istreambuf_iterators, etc.
  // Input Iterators have a cost structure very different from
  // pointers, calling for a different coding style.
  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InIterator>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
                   input_iterator_tag)
      {
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
        if (__beg == __end && __a == _Alloc())
          return _S_empty_rep()._M_refdata();
#endif
        // Avoid reallocation for common case.
        _CharT __buf[128];
        size_type __len = 0;
        while (__beg != __end && __len < sizeof(__buf) / sizeof(_CharT))
          {
            __buf[__len++] = *__beg;
            ++__beg;
          }
        _Rep* __r = _Rep::_S_create(__len, size_type(0), __a);
        _M_copy(__r->_M_refdata(), __buf, __len);
        __try
          {
            while (__beg != __end)
              {
                if (__len == __r->_M_capacity)
                  {
                    // Allocate more space.
                    _Rep* __another = _Rep::_S_create(__len + 1, __len, __a);
                    _M_copy(__another->_M_refdata(), __r->_M_refdata(), __len);
                    __r->_M_destroy(__a);
                    __r = __another;
                  }
                __r->_M_refdata()[__len++] = *__beg;
                ++__beg;
              }
          }
        __catch(...)
          {
            __r->_M_destroy(__a);
            __throw_exception_again;
          }
        __r->_M_set_length_and_sharable(__len);
        return __r->_M_refdata();
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template <typename _InIterator>
      _CharT*
      basic_string<_CharT, _Traits, _Alloc>::
      _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
                   forward_iterator_tag)
      {
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
        if (__beg == __end && __a == _Alloc())
          return _S_empty_rep()._M_refdata();
#endif
        // NB: Not required, but considered best practice.
        if (__gnu_cxx::__is_null_pointer(__beg) && __beg != __end)
          __throw_logic_error(__N("basic_string::_S_construct null not valid"));

        const size_type __dnew = static_cast<size_type>(std::distance(__beg,
                                                                      __end));
        // Check for out_of_range and length_error exceptions.
        _Rep* __r = _Rep::_S_create(__dnew, size_type(0), __a);
        __try
          { _S_copy_chars(__r->_M_refdata(), __beg, __end); }
        __catch(...)
          {
            __r->_M_destroy(__a);
            __throw_exception_again;
          }
        __r->_M_set_length_and_sharable(__dnew);
        return __r->_M_refdata();
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    _CharT*
    basic_string<_CharT, _Traits, _Alloc>::
    _S_construct(size_type __n, _CharT __c, const _Alloc& __a)
    {
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
      if (__n == 0 && __a == _Alloc())
        return _S_empty_rep()._M_refdata();
#endif
      // Check for out_of_range and length_error exceptions.
      _Rep* __r = _Rep::_S_create(__n, size_type(0), __a);
      if (__n)
        _M_assign(__r->_M_refdata(), __n, __c);

      __r->_M_set_length_and_sharable(__n);
      return __r->_M_refdata();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos, const _Alloc& __a)
    : _M_dataplus(_S_construct(__str._M_data()
                               + __str._M_check(__pos,
                                                "basic_string::basic_string"),
                               __str._M_data() + __str._M_limit(__pos, npos)
                               + __pos, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos, size_type __n)
    : _M_dataplus(_S_construct(__str._M_data()
                               + __str._M_check(__pos,
                                                "basic_string::basic_string"),
                               __str._M_data() + __str._M_limit(__pos, __n)
                               + __pos, _Alloc()), _Alloc())
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>::
    basic_string(const basic_string& __str, size_type __pos,
                 size_type __n, const _Alloc& __a)
    : _M_dataplus(_S_construct(__str._M_data()
                               + __str._M_check(__pos,
                                                "basic_string::basic_string"),
                               __str._M_data() + __str._M_limit(__pos, __n)
                               + __pos, __a), __a)
    { }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    assign(const basic_string& __str)
    {
      if (_M_rep() != __str._M_rep())
        {
          // XXX MT
          const allocator_type __a = this->get_allocator();
          _CharT* __tmp = __str._M_rep()->_M_grab(__a, __str.get_allocator());
          _M_rep()->_M_dispose(__a);
          _M_data(__tmp);
        }
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    assign(const _CharT* __s, size_type __n)
    {
      __glibcxx_requires_string_len(__s, __n);
      _M_check_length(this->size(), __n, "basic_string::assign");
      if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
        return _M_replace_safe(size_type(0), this->size(), __s, __n);
      else
        {
          // Work in-place.
          const size_type __pos = __s - _M_data();
          if (__pos >= __n)
            _M_copy(_M_data(), __s, __n);
          else if (__pos)
            _M_move(_M_data(), __s, __n);
          _M_rep()->_M_set_length_and_sharable(__n);
          return *this;
        }
     }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(size_type __n, _CharT __c)
    {
      if (__n)
        {
          _M_check_length(size_type(0), __n, "basic_string::append");     
          const size_type __len = __n + this->size();
          if (__len > this->capacity() || _M_rep()->_M_is_shared())
            this->reserve(__len);
          _M_assign(_M_data() + this->size(), __n, __c);
          _M_rep()->_M_set_length_and_sharable(__len);
        }
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const _CharT* __s, size_type __n)
    {
      __glibcxx_requires_string_len(__s, __n);
      if (__n)
        {
          _M_check_length(size_type(0), __n, "basic_string::append");
          const size_type __len = __n + this->size();
          if (__len > this->capacity() || _M_rep()->_M_is_shared())
            {
              if (_M_disjunct(__s))
                this->reserve(__len);
              else
                {
                  const size_type __off = __s - _M_data();
                  this->reserve(__len);
                  __s = _M_data() + __off;
                }
            }
          _M_copy(_M_data() + this->size(), __s, __n);
          _M_rep()->_M_set_length_and_sharable(__len);
        }
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const basic_string& __str)
    {
      const size_type __size = __str.size();
      if (__size)
        {
          const size_type __len = __size + this->size();
          if (__len > this->capacity() || _M_rep()->_M_is_shared())
            this->reserve(__len);
          _M_copy(_M_data() + this->size(), __str._M_data(), __size);
          _M_rep()->_M_set_length_and_sharable(__len);
        }
      return *this;
    }    

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    append(const basic_string& __str, size_type __pos, size_type __n)
    {
      __str._M_check(__pos, "basic_string::append");
      __n = __str._M_limit(__pos, __n);
      if (__n)
        {
          const size_type __len = __n + this->size();
          if (__len > this->capacity() || _M_rep()->_M_is_shared())
            this->reserve(__len);
          _M_copy(_M_data() + this->size(), __str._M_data() + __pos, __n);
          _M_rep()->_M_set_length_and_sharable(__len);    
        }
      return *this;
    }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     insert(size_type __pos, const _CharT* __s, size_type __n)
     {
       __glibcxx_requires_string_len(__s, __n);
       _M_check(__pos, "basic_string::insert");
       _M_check_length(size_type(0), __n, "basic_string::insert");
       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         return _M_replace_safe(__pos, size_type(0), __s, __n);
       else
         {
           // Work in-place.
           const size_type __off = __s - _M_data();
           _M_mutate(__pos, 0, __n);
           __s = _M_data() + __off;
           _CharT* __p = _M_data() + __pos;
           if (__s  + __n <= __p)
             _M_copy(__p, __s, __n);
           else if (__s >= __p)
             _M_copy(__p, __s + __n, __n);
           else
             {
               const size_type __nleft = __p - __s;
               _M_copy(__p, __s, __nleft);
               _M_copy(__p + __nleft, __p + __n, __n - __nleft);
             }
           return *this;
         }
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     typename basic_string<_CharT, _Traits, _Alloc>::iterator
     basic_string<_CharT, _Traits, _Alloc>::
     erase(iterator __first, iterator __last)
     {
       _GLIBCXX_DEBUG_PEDASSERT(__first >= _M_ibegin() && __first <= __last
                                && __last <= _M_iend());

       // NB: This isn't just an optimization (bail out early when
       // there is nothing to do, really), it's also a correctness
       // issue vs MT, see libstdc++/40518.
       const size_type __size = __last - __first;
       if (__size)
         {
           const size_type __pos = __first - _M_ibegin();
           _M_mutate(__pos, __size, size_type(0));
           _M_rep()->_M_set_leaked();
           return iterator(_M_data() + __pos);
         }
       else
         return __first;
     }

   template<typename _CharT, typename _Traits, typename _Alloc>
     basic_string<_CharT, _Traits, _Alloc>&
     basic_string<_CharT, _Traits, _Alloc>::
     replace(size_type __pos, size_type __n1, const _CharT* __s,
             size_type __n2)
     {
       __glibcxx_requires_string_len(__s, __n2);
       _M_check(__pos, "basic_string::replace");
       __n1 = _M_limit(__pos, __n1);
       _M_check_length(__n1, __n2, "basic_string::replace");
       bool __left;
       if (_M_disjunct(__s) || _M_rep()->_M_is_shared())
         return _M_replace_safe(__pos, __n1, __s, __n2);
       else if ((__left = __s + __n2 <= _M_data() + __pos)
                || _M_data() + __pos + __n1 <= __s)
         {
           // Work in-place: non-overlapping case.
           size_type __off = __s - _M_data();
           __left ? __off : (__off += __n2 - __n1);
           _M_mutate(__pos, __n1, __n2);
           _M_copy(_M_data() + __pos, _M_data() + __off, __n2);
           return *this;
         }
       else
         {
           // Todo: overlapping case.
           const basic_string __tmp(__s, __n2);
           return _M_replace_safe(__pos, __n1, __tmp._M_data(), __n2);
         }
     }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _M_destroy(const _Alloc& __a) throw ()
    {
      const size_type __size = sizeof(_Rep_base) +
                               (this->_M_capacity + 1) * sizeof(_CharT);
      _Raw_bytes_alloc(__a).deallocate(reinterpret_cast<char*>(this), __size);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_leak_hard()
    {
#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
      if (_M_rep() == &_S_empty_rep())
        return;
#endif
      if (_M_rep()->_M_is_shared())
        _M_mutate(0, 0, 0);
      _M_rep()->_M_set_leaked();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    _M_mutate(size_type __pos, size_type __len1, size_type __len2)
    {
      const size_type __old_size = this->size();
      const size_type __new_size = __old_size + __len2 - __len1;
      const size_type __how_much = __old_size - __pos - __len1;

      if (__new_size > this->capacity() || _M_rep()->_M_is_shared())
        {
          // Must reallocate.
          const allocator_type __a = get_allocator();
          _Rep* __r = _Rep::_S_create(__new_size, this->capacity(), __a);

          if (__pos)
            _M_copy(__r->_M_refdata(), _M_data(), __pos);
          if (__how_much)
            _M_copy(__r->_M_refdata() + __pos + __len2,
                    _M_data() + __pos + __len1, __how_much);

          _M_rep()->_M_dispose(__a);
          _M_data(__r->_M_refdata());
        }
      else if (__how_much && __len1 != __len2)
        {
          // Work in-place.
          _M_move(_M_data() + __pos + __len2,
                  _M_data() + __pos + __len1, __how_much);
        }
      _M_rep()->_M_set_length_and_sharable(__new_size);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    reserve(size_type __res)
    {
      const size_type __capacity = capacity();

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2968. Inconsistencies between basic_string reserve and
      // vector/unordered_map/unordered_set reserve functions
      // P0966 reserve should not shrink
      if (__res <= __capacity)
        {
          if (!_M_rep()->_M_is_shared())
            return;

          // unshare, but keep same capacity
          __res = __capacity;
        }

      const allocator_type __a = get_allocator();
      _CharT* __tmp = _M_rep()->_M_clone(__a, __res - this->size());
      _M_rep()->_M_dispose(__a);
      _M_data(__tmp);
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    swap(basic_string& __s)
    _GLIBCXX_NOEXCEPT_IF(allocator_traits<_Alloc>::is_always_equal::value)
    {
      if (_M_rep()->_M_is_leaked())
        _M_rep()->_M_set_sharable();
      if (__s._M_rep()->_M_is_leaked())
        __s._M_rep()->_M_set_sharable();
      if (this->get_allocator() == __s.get_allocator())
        {
          _CharT* __tmp = _M_data();
          _M_data(__s._M_data());
          __s._M_data(__tmp);
        }
      // The code below can usually be optimized away.
      else
        {
          const basic_string __tmp1(_M_ibegin(), _M_iend(),
                                    __s.get_allocator());
          const basic_string __tmp2(__s._M_ibegin(), __s._M_iend(),
                                    this->get_allocator());
          *this = __tmp2;
          __s = __tmp1;
        }
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::_Rep*
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _S_create(size_type __capacity, size_type __old_capacity,
              const _Alloc& __alloc)
    {
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 83.  String::npos vs. string::max_size()
      if (__capacity > _S_max_size)
        __throw_length_error(__N("basic_string::_S_create"));

      // The standard places no restriction on allocating more memory
      // than is strictly needed within this layer at the moment or as
      // requested by an explicit application call to reserve(n).

      // Many malloc implementations perform quite poorly when an
      // application attempts to allocate memory in a stepwise fashion
      // growing each allocation size by only 1 char.  Additionally,
      // it makes little sense to allocate less linear memory than the
      // natural blocking size of the malloc implementation.
      // Unfortunately, we would need a somewhat low-level calculation
      // with tuned parameters to get this perfect for any particular
      // malloc implementation.  Fortunately, generalizations about
      // common features seen among implementations seems to suffice.

      // __pagesize need not match the actual VM page size for good
      // results in practice, thus we pick a common value on the low
      // side.  __malloc_header_size is an estimate of the amount of
      // overhead per memory allocation (in practice seen N * sizeof
      // (void*) where N is 0, 2 or 4).  According to folklore,
      // picking this value on the high side is better than
      // low-balling it (especially when this algorithm is used with
      // malloc implementations that allocate memory blocks rounded up
      // to a size which is a power of 2).
      const size_type __pagesize = 4096;
      const size_type __malloc_header_size = 4 * sizeof(void*);

      // The below implements an exponential growth policy, necessary to
      // meet amortized linear time requirements of the library: see
      // http://gcc.gnu.org/ml/libstdc++/2001-07/msg00085.html.
      // It's active for allocations requiring an amount of memory above
      // system pagesize. This is consistent with the requirements of the
      // standard: http://gcc.gnu.org/ml/libstdc++/2001-07/msg00130.html
      if (__capacity > __old_capacity && __capacity < 2 * __old_capacity)
        __capacity = 2 * __old_capacity;

      // NB: Need an array of char_type[__capacity], plus a terminating
      // null char_type() element, plus enough for the _Rep data structure.
      // Whew. Seemingly so needy, yet so elemental.
      size_type __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);

      const size_type __adj_size = __size + __malloc_header_size;
      if (__adj_size > __pagesize && __capacity > __old_capacity)
        {
          const size_type __extra = __pagesize - __adj_size % __pagesize;
          __capacity += __extra / sizeof(_CharT);
          // Never allocate a string bigger than _S_max_size.
          if (__capacity > _S_max_size)
            __capacity = _S_max_size;
          __size = (__capacity + 1) * sizeof(_CharT) + sizeof(_Rep);
        }

      // NB: Might throw, but no worries about a leak, mate: _Rep()
      // does not throw.
      void* __place = _Raw_bytes_alloc(__alloc).allocate(__size);
      _Rep *__p = new (__place) _Rep;
      __p->_M_capacity = __capacity;
      // ABI compatibility - 3.4.x set in _S_create both
      // _M_refcount and _M_length.  All callers of _S_create
      // in basic_string.tcc then set just _M_length.
      // In 4.0.x and later both _M_refcount and _M_length
      // are initialized in the callers, unfortunately we can
      // have 3.4.x compiled code with _S_create callers inlined
      // calling 4.0.x+ _S_create.
      __p->_M_set_sharable();
      return __p;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    _CharT*
    basic_string<_CharT, _Traits, _Alloc>::_Rep::
    _M_clone(const _Alloc& __alloc, size_type __res)
    {
      // Requested capacity of the clone.
      const size_type __requested_cap = this->_M_length + __res;
      _Rep* __r = _Rep::_S_create(__requested_cap, this->_M_capacity,
                                  __alloc);
      if (this->_M_length)
        _M_copy(__r->_M_refdata(), _M_refdata(), this->_M_length);

      __r->_M_set_length_and_sharable(this->_M_length);
      return __r->_M_refdata();
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    resize(size_type __n, _CharT __c)
    {
      const size_type __size = this->size();
      _M_check_length(__size, __n, "basic_string::resize");
      if (__size < __n)
        this->append(__n - __size, __c);
      else if (__n < __size)
        this->erase(__n);
      // else nothing (in particular, avoid calling _M_mutate() unnecessarily.)
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    template<typename _InputIterator>
      basic_string<_CharT, _Traits, _Alloc>&
      basic_string<_CharT, _Traits, _Alloc>::
      _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
                          _InputIterator __k2, __false_type)
      {
        const basic_string __s(__k1, __k2);
        const size_type __n1 = __i2 - __i1;
        _M_check_length(__n1, __s.size(), "basic_string::_M_replace_dispatch");
        return _M_replace_safe(__i1 - _M_ibegin(), __n1, __s._M_data(),
                               __s.size());
      }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
                   _CharT __c)
    {
      _M_check_length(__n1, __n2, "basic_string::_M_replace_aux");
      _M_mutate(__pos1, __n1, __n2);
      if (__n2)
        _M_assign(_M_data() + __pos1, __n2, __c);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>&
    basic_string<_CharT, _Traits, _Alloc>::
    _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
                    size_type __n2)
    {
      _M_mutate(__pos1, __n1, __n2);
      if (__n2)
        _M_copy(_M_data() + __pos1, __s, __n2);
      return *this;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    void
    basic_string<_CharT, _Traits, _Alloc>::
    reserve()
    {
#if __cpp_exceptions
      if (length() < capacity() || _M_rep()->_M_is_shared())
        try
          {
            const allocator_type __a = get_allocator();
            _CharT* __tmp = _M_rep()->_M_clone(__a);
            _M_rep()->_M_dispose(__a);
            _M_data(__tmp);
          }
        catch (const __cxxabiv1::__forced_unwind&)
          { throw; }
        catch (...)
          { /* swallow the exception */ }
#endif
    }

    template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    copy(_CharT* __s, size_type __n, size_type __pos) const
    {
      _M_check(__pos, "basic_string::copy");
      __n = _M_limit(__pos, __n);
      __glibcxx_requires_string_len(__s, __n);
      if (__n)
        _M_copy(__s, _M_data() + __pos, __n);
      // 21.3.5.7 par 3: do not append null.  (good.)
      return __n;
    }
#endif  // !_GLIBCXX_USE_CXX11_ABI
   
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>
    operator+(const _CharT* __lhs,
              const basic_string<_CharT, _Traits, _Alloc>& __rhs)
    {
      __glibcxx_requires_string(__lhs);
      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
      typedef typename __string_type::size_type   __size_type;
      typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
        rebind<_CharT>::other _Char_alloc_type;
      typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
      const __size_type __len = _Traits::length(__lhs);
      __string_type __str(_Alloc_traits::_S_select_on_copy(
          __rhs.get_allocator()));
      __str.reserve(__len + __rhs.size());
      __str.append(__lhs, __len);
      __str.append(__rhs);
      return __str;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_string<_CharT, _Traits, _Alloc>
    operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
    {
      typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
      typedef typename __string_type::size_type   __size_type;
      typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
        rebind<_CharT>::other _Char_alloc_type;
      typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
      __string_type __str(_Alloc_traits::_S_select_on_copy(
          __rhs.get_allocator()));
      const __size_type __len = __rhs.size();
      __str.reserve(__len + 1);
      __str.append(__size_type(1), __lhs);
      __str.append(__rhs);
      return __str;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      const size_type __size = this->size();

      if (__n == 0)
        return __pos <= __size ? __pos : npos;
      if (__pos >= __size)
        return npos;

      const _CharT __elem0 = __s[0];
      const _CharT* const __data = data();
      const _CharT* __first = __data + __pos;
      const _CharT* const __last = __data + __size;
      size_type __len = __size - __pos;

      while (__len >= __n)
        {
          // Find the first occurrence of __elem0:
          __first = traits_type::find(__first, __len - __n + 1, __elem0);
          if (!__first)
            return npos;
          // Compare the full strings from the first occurrence of __elem0.
          // We already know that __first[0] == __s[0] but compare them again
          // anyway because __s is probably aligned, which helps memcmp.
          if (traits_type::compare(__first, __s, __n) == 0)
            return __first - __data;
          __len = __last - ++__first;
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
    {
      size_type __ret = npos;
      const size_type __size = this->size();
      if (__pos < __size)
        {
          const _CharT* __data = _M_data();
          const size_type __n = __size - __pos;
          const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
          if (__p)
            __ret = __p - __data;
        }
      return __ret;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    rfind(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      const size_type __size = this->size();
      if (__n <= __size)
        {
          __pos = std::min(size_type(__size - __n), __pos);
          const _CharT* __data = _M_data();
          do
            {
              if (traits_type::compare(__data + __pos, __s, __n) == 0)
                return __pos;
            }
          while (__pos-- > 0);
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
    {
      size_type __size = this->size();
      if (__size)
        {
          if (--__size > __pos)
            __size = __pos;
          for (++__size; __size-- > 0; )
            if (traits_type::eq(_M_data()[__size], __c))
              return __size;
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      for (; __n && __pos < this->size(); ++__pos)
        {
          const _CharT* __p = traits_type::find(__s, __n, _M_data()[__pos]);
          if (__p)
            return __pos;
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      size_type __size = this->size();
      if (__size && __n)
        {
          if (--__size > __pos)
            __size = __pos;
          do
            {
              if (traits_type::find(__s, __n, _M_data()[__size]))
                return __size;
            }
          while (__size-- != 0);
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      for (; __pos < this->size(); ++__pos)
        if (!traits_type::find(__s, __n, _M_data()[__pos]))
          return __pos;
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
    {
      for (; __pos < this->size(); ++__pos)
        if (!traits_type::eq(_M_data()[__pos], __c))
          return __pos;
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
    _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string_len(__s, __n);
      size_type __size = this->size();
      if (__size)
        {
          if (--__size > __pos)
            __size = __pos;
          do
            {
              if (!traits_type::find(__s, __n, _M_data()[__size]))
                return __size;
            }
          while (__size--);
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    typename basic_string<_CharT, _Traits, _Alloc>::size_type
    basic_string<_CharT, _Traits, _Alloc>::
    find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
    {
      size_type __size = this->size();
      if (__size)
        {
          if (--__size > __pos)
            __size = __pos;
          do
            {
              if (!traits_type::eq(_M_data()[__size], __c))
                return __size;
            }
          while (__size--);
        }
      return npos;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n, const basic_string& __str) const
    {
      _M_check(__pos, "basic_string::compare");
      __n = _M_limit(__pos, __n);
      const size_type __osize = __str.size();
      const size_type __len = std::min(__n, __osize);
      int __r = traits_type::compare(_M_data() + __pos, __str.data(), __len);
      if (!__r)
        __r = _S_compare(__n, __osize);
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(size_type __pos1, size_type __n1, const basic_string& __str,
            size_type __pos2, size_type __n2) const
    {
      _M_check(__pos1, "basic_string::compare");
      __str._M_check(__pos2, "basic_string::compare");
      __n1 = _M_limit(__pos1, __n1);
      __n2 = __str._M_limit(__pos2, __n2);
      const size_type __len = std::min(__n1, __n2);
      int __r = traits_type::compare(_M_data() + __pos1,
                                     __str.data() + __pos2, __len);
      if (!__r)
        __r = _S_compare(__n1, __n2);
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string<_CharT, _Traits, _Alloc>::
    compare(const _CharT* __s) const _GLIBCXX_NOEXCEPT
    {
      __glibcxx_requires_string(__s);
      const size_type __size = this->size();
      const size_type __osize = traits_type::length(__s);
      const size_type __len = std::min(__size, __osize);
      int __r = traits_type::compare(_M_data(), __s, __len);
      if (!__r)
        __r = _S_compare(__size, __osize);
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string <_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n1, const _CharT* __s) const
    {
      __glibcxx_requires_string(__s);
      _M_check(__pos, "basic_string::compare");
      __n1 = _M_limit(__pos, __n1);
      const size_type __osize = traits_type::length(__s);
      const size_type __len = std::min(__n1, __osize);
      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
      if (!__r)
        __r = _S_compare(__n1, __osize);
      return __r;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    int
    basic_string <_CharT, _Traits, _Alloc>::
    compare(size_type __pos, size_type __n1, const _CharT* __s,
            size_type __n2) const
    {
      __glibcxx_requires_string_len(__s, __n2);
      _M_check(__pos, "basic_string::compare");
      __n1 = _M_limit(__pos, __n1);
      const size_type __len = std::min(__n1, __n2);
      int __r = traits_type::compare(_M_data() + __pos, __s, __len);
      if (!__r)
        __r = _S_compare(__n1, __n2);
      return __r;
    }

  // 21.3.7.9 basic_string::getline and operators
  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_istream<_CharT, _Traits>&
    operator>>(basic_istream<_CharT, _Traits>& __in,
               basic_string<_CharT, _Traits, _Alloc>& __str)
    {
      typedef basic_istream<_CharT, _Traits>            __istream_type;
      typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
      typedef typename __istream_type::ios_base         __ios_base;
      typedef typename __istream_type::int_type         __int_type;
      typedef typename __string_type::size_type         __size_type;
      typedef ctype<_CharT>                             __ctype_type;
      typedef typename __ctype_type::ctype_base         __ctype_base;

      __size_type __extracted = 0;
      typename __ios_base::iostate __err = __ios_base::goodbit;
      typename __istream_type::sentry __cerb(__in, false);
      if (__cerb)
        {
          __try
            {
              // Avoid reallocation for common case.
              __str.erase();
              _CharT __buf[128];
              __size_type __len = 0;          
              const streamsize __w = __in.width();
              const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
                                              : __str.max_size();
              const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
              const __int_type __eof = _Traits::eof();
              __int_type __c = __in.rdbuf()->sgetc();

              while (__extracted < __n
                     && !_Traits::eq_int_type(__c, __eof)
                     && !__ct.is(__ctype_base::space,
                                 _Traits::to_char_type(__c)))
                {
                  if (__len == sizeof(__buf) / sizeof(_CharT))
                    {
                      __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
                      __len = 0;
                    }
                  __buf[__len++] = _Traits::to_char_type(__c);
                  ++__extracted;
                  __c = __in.rdbuf()->snextc();
                }
              __str.append(__buf, __len);

              if (__extracted < __n && _Traits::eq_int_type(__c, __eof))
                __err |= __ios_base::eofbit;
              __in.width(0);
            }
          __catch(__cxxabiv1::__forced_unwind&)
            {
              __in._M_setstate(__ios_base::badbit);
              __throw_exception_again;
            }
          __catch(...)
            {
              // _GLIBCXX_RESOLVE_LIB_DEFECTS
              // 91. Description of operator>> and getline() for string<>
              // might cause endless loop
              __in._M_setstate(__ios_base::badbit);
            }
        }
      // 211.  operator>>(istream&, string&) doesn't set failbit
      if (!__extracted)
        __err |= __ios_base::failbit;
      if (__err)
        __in.setstate(__err);
      return __in;
    }

  template<typename _CharT, typename _Traits, typename _Alloc>
    basic_istream<_CharT, _Traits>&
    getline(basic_istream<_CharT, _Traits>& __in,
            basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
    {
      typedef basic_istream<_CharT, _Traits>            __istream_type;
      typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
      typedef typename __istream_type::ios_base         __ios_base;
      typedef typename __istream_type::int_type         __int_type;
      typedef typename __string_type::size_type         __size_type;

      __size_type __extracted = 0;
      const __size_type __n = __str.max_size();
      typename __ios_base::iostate __err = __ios_base::goodbit;
      typename __istream_type::sentry __cerb(__in, true);
      if (__cerb)
        {
          __try
            {
              __str.erase();
              const __int_type __idelim = _Traits::to_int_type(__delim);
              const __int_type __eof = _Traits::eof();
              __int_type __c = __in.rdbuf()->sgetc();

              while (__extracted < __n
                     && !_Traits::eq_int_type(__c, __eof)
                     && !_Traits::eq_int_type(__c, __idelim))
                {
                  __str += _Traits::to_char_type(__c);
                  ++__extracted;
                  __c = __in.rdbuf()->snextc();
                }

              if (_Traits::eq_int_type(__c, __eof))
                __err |= __ios_base::eofbit;
              else if (_Traits::eq_int_type(__c, __idelim))
                {
                  ++__extracted;                  
                  __in.rdbuf()->sbumpc();
                }
              else
                __err |= __ios_base::failbit;
            }
          __catch(__cxxabiv1::__forced_unwind&)
            {
              __in._M_setstate(__ios_base::badbit);
              __throw_exception_again;
            }
          __catch(...)
            {
              // _GLIBCXX_RESOLVE_LIB_DEFECTS
              // 91. Description of operator>> and getline() for string<>
              // might cause endless loop
              __in._M_setstate(__ios_base::badbit);
            }
        }
      if (!__extracted)
        __err |= __ios_base::failbit;
      if (__err)
        __in.setstate(__err);
      return __in;
    }

  // Inhibit implicit instantiations for required instantiations,
  // which are defined via explicit instantiations elsewhere.
#if _GLIBCXX_EXTERN_TEMPLATE
  // The explicit instantiation definitions in src/c++11/string-inst.cc and
  // src/c++17/string-inst.cc only instantiate the members required for C++17
  // and earlier standards (so not C++20's starts_with and ends_with).
  // Suppress the explicit instantiation declarations for C++20, so C++20
  // code will implicitly instantiate std::string and std::wstring as needed.
# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
  extern template class basic_string<char>;
# elif ! _GLIBCXX_USE_CXX11_ABI
  // Still need to prevent implicit instantiation of the COW empty rep,
  // to ensure the definition in libstdc++.so is unique (PR 86138).
  extern template basic_string<char>::size_type
    basic_string<char>::_Rep::_S_empty_rep_storage[];
# endif

  extern template
    basic_istream<char>&
    operator>>(basic_istream<char>&, string&);
  extern template
    basic_ostream<char>&
    operator<<(basic_ostream<char>&, const string&);
  extern template
    basic_istream<char>&
    getline(basic_istream<char>&, string&, char);
  extern template
    basic_istream<char>&
    getline(basic_istream<char>&, string&);

#ifdef _GLIBCXX_USE_WCHAR_T
# if __cplusplus <= 201703L && _GLIBCXX_EXTERN_TEMPLATE > 0
  extern template class basic_string<wchar_t>;
# elif ! _GLIBCXX_USE_CXX11_ABI
  extern template basic_string<wchar_t>::size_type
    basic_string<wchar_t>::_Rep::_S_empty_rep_storage[];
# endif

  extern template
    basic_istream<wchar_t>&
    operator>>(basic_istream<wchar_t>&, wstring&);
  extern template
    basic_ostream<wchar_t>&
    operator<<(basic_ostream<wchar_t>&, const wstring&);
  extern template
    basic_istream<wchar_t>&
    getline(basic_istream<wchar_t>&, wstring&, wchar_t);
  extern template
    basic_istream<wchar_t>&
    getline(basic_istream<wchar_t>&, wstring&);
#endif // _GLIBCXX_USE_WCHAR_T
#endif // _GLIBCXX_EXTERN_TEMPLATE

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif