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// Deque implementation (out of line) -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004, 2005 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file deque.tcc
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _DEQUE_TCC
#define _DEQUE_TCC 1

namespace _GLIBCXX_STD
{
  template <typename _Tp, typename _Alloc>
    deque<_Tp, _Alloc>&
    deque<_Tp, _Alloc>::
    operator=(const deque& __x)
    {
      const size_type __len = size();
      if (&__x != this)
        {
          if (__len >= __x.size())
            erase(std::copy(__x.begin(), __x.end(), this->_M_impl._M_start),
                  this->_M_impl._M_finish);
          else
            {
              const_iterator __mid = __x.begin() + difference_type(__len);
              std::copy(__x.begin(), __mid, this->_M_impl._M_start);
              insert(this->_M_impl._M_finish, __mid, __x.end());
            }
        }
      return *this;
    }

  template <typename _Tp, typename _Alloc>
    typename deque<_Tp, _Alloc>::iterator
    deque<_Tp, _Alloc>::
    insert(iterator position, const value_type& __x)
    {
      if (position._M_cur == this->_M_impl._M_start._M_cur)
        {
          push_front(__x);
          return this->_M_impl._M_start;
        }
      else if (position._M_cur == this->_M_impl._M_finish._M_cur)
        {
          push_back(__x);
          iterator __tmp = this->_M_impl._M_finish;
          --__tmp;
          return __tmp;
        }
      else
        return _M_insert_aux(position, __x);
    }

  template <typename _Tp, typename _Alloc>
    typename deque<_Tp, _Alloc>::iterator
    deque<_Tp, _Alloc>::
    erase(iterator __position)
    {
      iterator __next = __position;
      ++__next;
      const size_type __index = __position - this->_M_impl._M_start;
      if (__index < (size() >> 1))
        {
          std::copy_backward(this->_M_impl._M_start, __position, __next);
          pop_front();
        }
      else
        {
          std::copy(__next, this->_M_impl._M_finish, __position);
          pop_back();
        }
      return this->_M_impl._M_start + __index;
    }

  template <typename _Tp, typename _Alloc>
    typename deque<_Tp, _Alloc>::iterator
    deque<_Tp, _Alloc>::
    erase(iterator __first, iterator __last)
    {
      if (__first == this->_M_impl._M_start
          && __last == this->_M_impl._M_finish)
        {
          clear();
          return this->_M_impl._M_finish;
        }
      else
        {
          const difference_type __n = __last - __first;
          const difference_type __elems_before = (__first
                                                  - this->_M_impl._M_start);
          if (static_cast<size_type>(__elems_before) < (size() - __n) / 2)
            {
              std::copy_backward(this->_M_impl._M_start, __first, __last);
              iterator __new_start = this->_M_impl._M_start + __n;
              std::_Destroy(this->_M_impl._M_start, __new_start,
                            _M_get_Tp_allocator());
              _M_destroy_nodes(this->_M_impl._M_start._M_node,
                               __new_start._M_node);
              this->_M_impl._M_start = __new_start;
            }
          else
            {
              std::copy(__last, this->_M_impl._M_finish, __first);
              iterator __new_finish = this->_M_impl._M_finish - __n;
              std::_Destroy(__new_finish, this->_M_impl._M_finish,
                            _M_get_Tp_allocator());
              _M_destroy_nodes(__new_finish._M_node + 1,
                               this->_M_impl._M_finish._M_node + 1);
              this->_M_impl._M_finish = __new_finish;
            }
          return this->_M_impl._M_start + __elems_before;
        }
    }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    clear()
    {
      for (_Map_pointer __node = this->_M_impl._M_start._M_node + 1;
           __node < this->_M_impl._M_finish._M_node;
           ++__node)
        {
          std::_Destroy(*__node, *__node + _S_buffer_size(),
                        _M_get_Tp_allocator());
          _M_deallocate_node(*__node);
        }

      if (this->_M_impl._M_start._M_node != this->_M_impl._M_finish._M_node)
        {
          std::_Destroy(this->_M_impl._M_start._M_cur,
                        this->_M_impl._M_start._M_last,
                        _M_get_Tp_allocator());
          std::_Destroy(this->_M_impl._M_finish._M_first,
                        this->_M_impl._M_finish._M_cur,
                        _M_get_Tp_allocator());
          _M_deallocate_node(this->_M_impl._M_finish._M_first);
        }
      else
        std::_Destroy(this->_M_impl._M_start._M_cur,
                      this->_M_impl._M_finish._M_cur,
                      _M_get_Tp_allocator());

      this->_M_impl._M_finish = this->_M_impl._M_start;
    }

  template <typename _Tp, class _Alloc>
    template <typename _InputIterator>
      void
      deque<_Tp, _Alloc>::
      _M_assign_aux(_InputIterator __first, _InputIterator __last,
                    std::input_iterator_tag)
      {
        iterator __cur = begin();
        for (; __first != __last && __cur != end(); ++__cur, ++__first)
          *__cur = *__first;
        if (__first == __last)
          erase(__cur, end());
        else
          insert(end(), __first, __last);
      }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_fill_insert(iterator __pos, size_type __n, const value_type& __x)
    {
      if (__pos._M_cur == this->_M_impl._M_start._M_cur)
        {
          iterator __new_start = _M_reserve_elements_at_front(__n);
          try
            {
              std::__uninitialized_fill_a(__new_start, this->_M_impl._M_start,
                                          __x,
                                          _M_get_Tp_allocator());
              this->_M_impl._M_start = __new_start;
            }
          catch(...)
            {
              _M_destroy_nodes(__new_start._M_node,
                               this->_M_impl._M_start._M_node);
              __throw_exception_again;
            }
        }
      else if (__pos._M_cur == this->_M_impl._M_finish._M_cur)
        {
          iterator __new_finish = _M_reserve_elements_at_back(__n);
          try
            {
              std::__uninitialized_fill_a(this->_M_impl._M_finish,
                                          __new_finish, __x,
                                          _M_get_Tp_allocator());
              this->_M_impl._M_finish = __new_finish;
            }
          catch(...)
            {
              _M_destroy_nodes(this->_M_impl._M_finish._M_node + 1,
                               __new_finish._M_node + 1);
              __throw_exception_again;
            }
        }
      else
        _M_insert_aux(__pos, __n, __x);
    }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_fill_initialize(const value_type& __value)
    {
      _Map_pointer __cur;
      try
        {
          for (__cur = this->_M_impl._M_start._M_node;
               __cur < this->_M_impl._M_finish._M_node;
               ++__cur)
            std::__uninitialized_fill_a(*__cur, *__cur + _S_buffer_size(),
                                        __value, _M_get_Tp_allocator());
          std::__uninitialized_fill_a(this->_M_impl._M_finish._M_first,
                                      this->_M_impl._M_finish._M_cur,
                                      __value, _M_get_Tp_allocator());
        }
      catch(...)
        {
          std::_Destroy(this->_M_impl._M_start, iterator(*__cur, __cur),
                        _M_get_Tp_allocator());
          __throw_exception_again;
        }
    }

  template <typename _Tp, typename _Alloc>
    template <typename _InputIterator>
      void
      deque<_Tp, _Alloc>::
      _M_range_initialize(_InputIterator __first, _InputIterator __last,
                          std::input_iterator_tag)
      {
        this->_M_initialize_map(0);
        try
          {
            for (; __first != __last; ++__first)
              push_back(*__first);
          }
        catch(...)
          {
            clear();
            __throw_exception_again;
          }
      }

  template <typename _Tp, typename _Alloc>
    template <typename _ForwardIterator>
      void
      deque<_Tp, _Alloc>::
      _M_range_initialize(_ForwardIterator __first, _ForwardIterator __last,
                          std::forward_iterator_tag)
      {
        const size_type __n = std::distance(__first, __last);
        this->_M_initialize_map(__n);

        _Map_pointer __cur_node;
        try
          {
            for (__cur_node = this->_M_impl._M_start._M_node;
                 __cur_node < this->_M_impl._M_finish._M_node;
                 ++__cur_node)
            {
              _ForwardIterator __mid = __first;
              std::advance(__mid, _S_buffer_size());
              std::__uninitialized_copy_a(__first, __mid, *__cur_node,
                                          _M_get_Tp_allocator());
              __first = __mid;
            }
            std::__uninitialized_copy_a(__first, __last,
                                        this->_M_impl._M_finish._M_first,
                                        _M_get_Tp_allocator());
          }
        catch(...)
          {
            std::_Destroy(this->_M_impl._M_start,
                          iterator(*__cur_node, __cur_node),
                          _M_get_Tp_allocator());
            __throw_exception_again;
          }
      }

  // Called only if _M_impl._M_finish._M_cur == _M_impl._M_finish._M_last - 1.
  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_push_back_aux(const value_type& __t)
    {
      value_type __t_copy = __t;
      _M_reserve_map_at_back();
      *(this->_M_impl._M_finish._M_node + 1) = this->_M_allocate_node();
      try
        {
          this->_M_impl.construct(this->_M_impl._M_finish._M_cur, __t_copy);
          this->_M_impl._M_finish._M_set_node(this->_M_impl._M_finish._M_node
                                              + 1);
          this->_M_impl._M_finish._M_cur = this->_M_impl._M_finish._M_first;
        }
      catch(...)
        {
          _M_deallocate_node(*(this->_M_impl._M_finish._M_node + 1));
          __throw_exception_again;
        }
    }

  // Called only if _M_impl._M_start._M_cur == _M_impl._M_start._M_first.
  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_push_front_aux(const value_type& __t)
    {
      value_type __t_copy = __t;
      _M_reserve_map_at_front();
      *(this->_M_impl._M_start._M_node - 1) = this->_M_allocate_node();
      try
        {
          this->_M_impl._M_start._M_set_node(this->_M_impl._M_start._M_node
                                             - 1);
          this->_M_impl._M_start._M_cur = this->_M_impl._M_start._M_last - 1;
          this->_M_impl.construct(this->_M_impl._M_start._M_cur, __t_copy);
        }
      catch(...)
        {
          ++this->_M_impl._M_start;
          _M_deallocate_node(*(this->_M_impl._M_start._M_node - 1));
          __throw_exception_again;
        }
    }

  // Called only if _M_impl._M_finish._M_cur == _M_impl._M_finish._M_first.
  template <typename _Tp, typename _Alloc>
    void deque<_Tp, _Alloc>::
    _M_pop_back_aux()
    {
      _M_deallocate_node(this->_M_impl._M_finish._M_first);
      this->_M_impl._M_finish._M_set_node(this->_M_impl._M_finish._M_node - 1);
      this->_M_impl._M_finish._M_cur = this->_M_impl._M_finish._M_last - 1;
      this->_M_impl.destroy(this->_M_impl._M_finish._M_cur);
    }

  // Called only if _M_impl._M_start._M_cur == _M_impl._M_start._M_last - 1.
  // Note that if the deque has at least one element (a precondition for this
  // member function), and if
  //   _M_impl._M_start._M_cur == _M_impl._M_start._M_last,
  // then the deque must have at least two nodes.
  template <typename _Tp, typename _Alloc>
    void deque<_Tp, _Alloc>::
    _M_pop_front_aux()
    {
      this->_M_impl.destroy(this->_M_impl._M_start._M_cur);
      _M_deallocate_node(this->_M_impl._M_start._M_first);
      this->_M_impl._M_start._M_set_node(this->_M_impl._M_start._M_node + 1);
      this->_M_impl._M_start._M_cur = this->_M_impl._M_start._M_first;
    }

  template <typename _Tp, typename _Alloc>
    template <typename _InputIterator>
      void
      deque<_Tp, _Alloc>::
      _M_range_insert_aux(iterator __pos,
                          _InputIterator __first, _InputIterator __last,
                          std::input_iterator_tag)
      { std::copy(__first, __last, std::inserter(*this, __pos)); }

  template <typename _Tp, typename _Alloc>
    template <typename _ForwardIterator>
      void
      deque<_Tp, _Alloc>::
      _M_range_insert_aux(iterator __pos,
                          _ForwardIterator __first, _ForwardIterator __last,
                          std::forward_iterator_tag)
      {
        const size_type __n = std::distance(__first, __last);
        if (__pos._M_cur == this->_M_impl._M_start._M_cur)
          {
            iterator __new_start = _M_reserve_elements_at_front(__n);
            try
              {
                std::__uninitialized_copy_a(__first, __last, __new_start,
                                            _M_get_Tp_allocator());
                this->_M_impl._M_start = __new_start;
              }
            catch(...)
              {
                _M_destroy_nodes(__new_start._M_node,
                                 this->_M_impl._M_start._M_node);
                __throw_exception_again;
              }
          }
        else if (__pos._M_cur == this->_M_impl._M_finish._M_cur)
          {
            iterator __new_finish = _M_reserve_elements_at_back(__n);
            try
              {
                std::__uninitialized_copy_a(__first, __last,
                                            this->_M_impl._M_finish,
                                            _M_get_Tp_allocator());
                this->_M_impl._M_finish = __new_finish;
              }
            catch(...)
              {
                _M_destroy_nodes(this->_M_impl._M_finish._M_node + 1,
                                 __new_finish._M_node + 1);
                __throw_exception_again;
              }
          }
        else
          _M_insert_aux(__pos, __first, __last, __n);
      }

  template <typename _Tp, typename _Alloc>
    typename deque<_Tp, _Alloc>::iterator
    deque<_Tp, _Alloc>::
    _M_insert_aux(iterator __pos, const value_type& __x)
    {
      difference_type __index = __pos - this->_M_impl._M_start;
      value_type __x_copy = __x; // XXX copy
      if (static_cast<size_type>(__index) < size() / 2)
        {
          push_front(front());
          iterator __front1 = this->_M_impl._M_start;
          ++__front1;
          iterator __front2 = __front1;
          ++__front2;
          __pos = this->_M_impl._M_start + __index;
          iterator __pos1 = __pos;
          ++__pos1;
          std::copy(__front2, __pos1, __front1);
        }
      else
        {
          push_back(back());
          iterator __back1 = this->_M_impl._M_finish;
          --__back1;
          iterator __back2 = __back1;
          --__back2;
          __pos = this->_M_impl._M_start + __index;
          std::copy_backward(__pos, __back2, __back1);
        }
      *__pos = __x_copy;
      return __pos;
    }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_insert_aux(iterator __pos, size_type __n, const value_type& __x)
    {
      const difference_type __elems_before = __pos - this->_M_impl._M_start;
      const size_type __length = this->size();
      value_type __x_copy = __x;
      if (__elems_before < difference_type(__length / 2))
        {
          iterator __new_start = _M_reserve_elements_at_front(__n);
          iterator __old_start = this->_M_impl._M_start;
          __pos = this->_M_impl._M_start + __elems_before;
          try
            {
              if (__elems_before >= difference_type(__n))
                {
                  iterator __start_n = (this->_M_impl._M_start
                                        + difference_type(__n));
                  std::__uninitialized_copy_a(this->_M_impl._M_start,
                                              __start_n, __new_start,
                                              _M_get_Tp_allocator());
                  this->_M_impl._M_start = __new_start;
                  std::copy(__start_n, __pos, __old_start);
                  fill(__pos - difference_type(__n), __pos, __x_copy);
                }
              else
                {
                  std::__uninitialized_copy_fill(this->_M_impl._M_start,
                                                 __pos, __new_start,
                                                 this->_M_impl._M_start,
                                                 __x_copy,
                                                 _M_get_Tp_allocator());
                  this->_M_impl._M_start = __new_start;
                  std::fill(__old_start, __pos, __x_copy);
                }
            }
          catch(...)
            {
              _M_destroy_nodes(__new_start._M_node,
                               this->_M_impl._M_start._M_node);
              __throw_exception_again;
            }
        }
      else
        {
          iterator __new_finish = _M_reserve_elements_at_back(__n);
          iterator __old_finish = this->_M_impl._M_finish;
          const difference_type __elems_after =
            difference_type(__length) - __elems_before;
          __pos = this->_M_impl._M_finish - __elems_after;
          try
            {
              if (__elems_after > difference_type(__n))
                {
                  iterator __finish_n = (this->_M_impl._M_finish
                                         - difference_type(__n));
                  std::__uninitialized_copy_a(__finish_n,
                                              this->_M_impl._M_finish,
                                              this->_M_impl._M_finish,
                                              _M_get_Tp_allocator());
                  this->_M_impl._M_finish = __new_finish;
                  std::copy_backward(__pos, __finish_n, __old_finish);
                  std::fill(__pos, __pos + difference_type(__n), __x_copy);
                }
              else
                {
                  std::__uninitialized_fill_copy(this->_M_impl._M_finish,
                                                 __pos + difference_type(__n),
                                                 __x_copy, __pos,
                                                 this->_M_impl._M_finish,
                                                 _M_get_Tp_allocator());
                  this->_M_impl._M_finish = __new_finish;
                  std::fill(__pos, __old_finish, __x_copy);
                }
            }
          catch(...)
            {
              _M_destroy_nodes(this->_M_impl._M_finish._M_node + 1,
                               __new_finish._M_node + 1);
              __throw_exception_again;
            }
        }
    }

  template <typename _Tp, typename _Alloc>
    template <typename _ForwardIterator>
      void
      deque<_Tp, _Alloc>::
      _M_insert_aux(iterator __pos,
                    _ForwardIterator __first, _ForwardIterator __last,
                    size_type __n)
      {
        const difference_type __elemsbefore = __pos - this->_M_impl._M_start;
        const size_type __length = size();
        if (static_cast<size_type>(__elemsbefore) < __length / 2)
          {
            iterator __new_start = _M_reserve_elements_at_front(__n);
            iterator __old_start = this->_M_impl._M_start;
            __pos = this->_M_impl._M_start + __elemsbefore;
            try
              {
                if (__elemsbefore >= difference_type(__n))
                  {
                    iterator __start_n = (this->_M_impl._M_start
                                          + difference_type(__n));
                    std::__uninitialized_copy_a(this->_M_impl._M_start,
                                                __start_n, __new_start,
                                                _M_get_Tp_allocator());
                    this->_M_impl._M_start = __new_start;
                    std::copy(__start_n, __pos, __old_start);
                    std::copy(__first, __last, __pos - difference_type(__n));
                  }
                else
                  {
                    _ForwardIterator __mid = __first;
                    std::advance(__mid, difference_type(__n) - __elemsbefore);
                    std::__uninitialized_copy_copy(this->_M_impl._M_start,
                                                   __pos, __first, __mid,
                                                   __new_start,
                                                   _M_get_Tp_allocator());
                    this->_M_impl._M_start = __new_start;
                    std::copy(__mid, __last, __old_start);
                  }
              }
            catch(...)
              {
                _M_destroy_nodes(__new_start._M_node,
                                 this->_M_impl._M_start._M_node);
                __throw_exception_again;
              }
          }
        else
        {
          iterator __new_finish = _M_reserve_elements_at_back(__n);
          iterator __old_finish = this->_M_impl._M_finish;
          const difference_type __elemsafter =
            difference_type(__length) - __elemsbefore;
          __pos = this->_M_impl._M_finish - __elemsafter;
          try
            {
              if (__elemsafter > difference_type(__n))
                {
                  iterator __finish_n = (this->_M_impl._M_finish
                                         - difference_type(__n));
                  std::__uninitialized_copy_a(__finish_n,
                                              this->_M_impl._M_finish,
                                              this->_M_impl._M_finish,
                                              _M_get_Tp_allocator());
                  this->_M_impl._M_finish = __new_finish;
                  std::copy_backward(__pos, __finish_n, __old_finish);
                  std::copy(__first, __last, __pos);
                }
              else
                {
                  _ForwardIterator __mid = __first;
                  std::advance(__mid, __elemsafter);
                  std::__uninitialized_copy_copy(__mid, __last, __pos,
                                                 this->_M_impl._M_finish,
                                                 this->_M_impl._M_finish,
                                                 _M_get_Tp_allocator());
                  this->_M_impl._M_finish = __new_finish;
                  std::copy(__first, __mid, __pos);
                }
            }
          catch(...)
            {
              _M_destroy_nodes(this->_M_impl._M_finish._M_node + 1,
                               __new_finish._M_node + 1);
              __throw_exception_again;
            }
        }
      }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_new_elements_at_front(size_type __new_elems)
    {
      const size_type __new_nodes
        = (__new_elems + _S_buffer_size() - 1) / _S_buffer_size();
      _M_reserve_map_at_front(__new_nodes);
      size_type __i;
      try
        {
          for (__i = 1; __i <= __new_nodes; ++__i)
            *(this->_M_impl._M_start._M_node - __i) = this->_M_allocate_node();
        }
      catch(...)
        {
          for (size_type __j = 1; __j < __i; ++__j)
            _M_deallocate_node(*(this->_M_impl._M_start._M_node - __j));
          __throw_exception_again;
        }
    }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_new_elements_at_back(size_type __new_elems)
    {
      const size_type __new_nodes
        = (__new_elems + _S_buffer_size() - 1) / _S_buffer_size();
      _M_reserve_map_at_back(__new_nodes);
      size_type __i;
      try
        {
          for (__i = 1; __i <= __new_nodes; ++__i)
            *(this->_M_impl._M_finish._M_node + __i) = this->_M_allocate_node();
        }
      catch(...)
        {
          for (size_type __j = 1; __j < __i; ++__j)
            _M_deallocate_node(*(this->_M_impl._M_finish._M_node + __j));
          __throw_exception_again;
        }
    }

  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp, _Alloc>::
    _M_reallocate_map(size_type __nodes_to_add, bool __add_at_front)
    {
      const size_type __old_num_nodes
        = this->_M_impl._M_finish._M_node - this->_M_impl._M_start._M_node + 1;
      const size_type __new_num_nodes = __old_num_nodes + __nodes_to_add;

      _Map_pointer __new_nstart;
      if (this->_M_impl._M_map_size > 2 * __new_num_nodes)
        {
          __new_nstart = this->_M_impl._M_map + (this->_M_impl._M_map_size
                                         - __new_num_nodes) / 2
                         + (__add_at_front ? __nodes_to_add : 0);
          if (__new_nstart < this->_M_impl._M_start._M_node)
            std::copy(this->_M_impl._M_start._M_node,
                    this->_M_impl._M_finish._M_node + 1,
                    __new_nstart);
          else
            std::copy_backward(this->_M_impl._M_start._M_node,
                               this->_M_impl._M_finish._M_node + 1,
                               __new_nstart + __old_num_nodes);
        }
      else
        {
          size_type __new_map_size = this->_M_impl._M_map_size
                                     + std::max(this->_M_impl._M_map_size,
                                                __nodes_to_add) + 2;

          _Map_pointer __new_map = this->_M_allocate_map(__new_map_size);
          __new_nstart = __new_map + (__new_map_size - __new_num_nodes) / 2
                         + (__add_at_front ? __nodes_to_add : 0);
          std::copy(this->_M_impl._M_start._M_node,
                    this->_M_impl._M_finish._M_node + 1,
                    __new_nstart);
          _M_deallocate_map(this->_M_impl._M_map, this->_M_impl._M_map_size);

          this->_M_impl._M_map = __new_map;
          this->_M_impl._M_map_size = __new_map_size;
        }

      this->_M_impl._M_start._M_set_node(__new_nstart);
      this->_M_impl._M_finish._M_set_node(__new_nstart + __old_num_nodes - 1);
    }
} // namespace std

#endif