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

// Copyright (C) 2001, 2002 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// 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 __GLIBCPP_INTERNAL_DEQUE_TCC
#define __GLIBCPP_INTERNAL_DEQUE_TCC

namespace 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(copy(__x.begin(), __x.end(), _M_start), _M_finish);
        else
        {
          const_iterator __mid = __x.begin() + difference_type(__len);
          copy(__x.begin(), __mid, _M_start);
          insert(_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 == _M_start._M_cur)
      {
        push_front(__x);
        return _M_start;
      }
      else if (position._M_cur == _M_finish._M_cur)
      {
        push_back(__x);
        iterator __tmp = _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;
      size_type __index = __position - _M_start;
      if (__index < (size() >> 1))
      {
        copy_backward(_M_start, __position, __next);
        pop_front();
      }
      else
      {
        copy(__next, _M_finish, __position);
        pop_back();
      }
      return _M_start + __index;
    }
  
  template <typename _Tp, typename _Alloc>
    typename deque<_Tp,_Alloc>::iterator 
    deque<_Tp,_Alloc>::
    erase(iterator __first, iterator __last)
    {
      if (__first == _M_start && __last == _M_finish)
      {
        clear();
        return _M_finish;
      }
      else
      {
        difference_type __n = __last - __first;
        difference_type __elems_before = __first - _M_start;
        if (static_cast<size_type>(__elems_before) < (size() - __n) / 2)
        {
          copy_backward(_M_start, __first, __last);
          iterator __new_start = _M_start + __n;
          _Destroy(_M_start, __new_start);
          _M_destroy_nodes(_M_start._M_node, __new_start._M_node);
          _M_start = __new_start;
        }
        else
        {
          copy(__last, _M_finish, __first);
          iterator __new_finish = _M_finish - __n;
          _Destroy(__new_finish, _M_finish);
          _M_destroy_nodes(__new_finish._M_node + 1, _M_finish._M_node + 1);
          _M_finish = __new_finish;
        }
        return _M_start + __elems_before;
      }
    }
    
  template <typename _Tp, typename _Alloc> 
    void
    deque<_Tp,_Alloc>::
    clear()
    {
      for (_Map_pointer __node = _M_start._M_node + 1;
           __node < _M_finish._M_node;
           ++__node)
      {
        _Destroy(*__node, *__node + _S_buffer_size());
        _M_deallocate_node(*__node);
      }
    
      if (_M_start._M_node != _M_finish._M_node)
      {
        _Destroy(_M_start._M_cur, _M_start._M_last);
        _Destroy(_M_finish._M_first, _M_finish._M_cur);
        _M_deallocate_node(_M_finish._M_first);
      }
      else
        _Destroy(_M_start._M_cur, _M_finish._M_cur);
    
      _M_finish = _M_start;
    }
    
  template <typename _Tp, class _Alloc>
    template <typename _InputIter>
      void
      deque<_Tp,_Alloc>
      ::_M_assign_aux(_InputIter __first, _InputIter __last, 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 == _M_start._M_cur)
      {
        iterator __new_start = _M_reserve_elements_at_front(__n);
        try
          {
            uninitialized_fill(__new_start, _M_start, __x);
            _M_start = __new_start;
          }
        catch(...)
          {
            _M_destroy_nodes(__new_start._M_node, _M_start._M_node);
            __throw_exception_again;
          }
      }
      else if (__pos._M_cur == _M_finish._M_cur)
      {
        iterator __new_finish = _M_reserve_elements_at_back(__n);
        try
          {
            uninitialized_fill(_M_finish, __new_finish, __x);
            _M_finish = __new_finish;
          }
        catch(...)
          {
            _M_destroy_nodes(_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 = _M_start._M_node; __cur < _M_finish._M_node; ++__cur)
            uninitialized_fill(*__cur, *__cur + _S_buffer_size(), __value);
          uninitialized_fill(_M_finish._M_first, _M_finish._M_cur, __value);
        }
      catch(...)
        {
          _Destroy(_M_start, iterator(*__cur, __cur));
          __throw_exception_again;
        }
    }
    
  template <typename _Tp, typename _Alloc>
    template <typename _InputIterator>
      void
      deque<_Tp,_Alloc>::
      _M_range_initialize(_InputIterator __first, _InputIterator __last,
                          input_iterator_tag)
      {
        _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,
                          forward_iterator_tag)
      {
        size_type __n = std::distance(__first, __last);
        _M_initialize_map(__n);
      
        _Map_pointer __cur_node;
        try
          {
            for (__cur_node = _M_start._M_node; 
                 __cur_node < _M_finish._M_node; 
                 ++__cur_node)
            {
              _ForwardIterator __mid = __first;
              advance(__mid, _S_buffer_size());
              uninitialized_copy(__first, __mid, *__cur_node);
              __first = __mid;
            }
            uninitialized_copy(__first, __last, _M_finish._M_first);
          }
        catch(...)
          {
            _Destroy(_M_start, iterator(*__cur_node, __cur_node));
            __throw_exception_again;
          }
      }
    
  // Called only if _M_finish._M_cur == _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();
      *(_M_finish._M_node + 1) = _M_allocate_node();
      try
        {
          _Construct(_M_finish._M_cur, __t_copy);
          _M_finish._M_set_node(_M_finish._M_node + 1);
          _M_finish._M_cur = _M_finish._M_first;
        }
      catch(...)
        {
          _M_deallocate_node(*(_M_finish._M_node + 1));
          __throw_exception_again;
        }
    }
    
  #ifdef _GLIBCPP_DEPRECATED
  // Called only if _M_finish._M_cur == _M_finish._M_last - 1.
  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp,_Alloc>::
    _M_push_back_aux()
    {
      _M_reserve_map_at_back();
      *(_M_finish._M_node + 1) = _M_allocate_node();
      try
        {
          _Construct(_M_finish._M_cur);
          _M_finish._M_set_node(_M_finish._M_node + 1);
          _M_finish._M_cur = _M_finish._M_first;
        }
      catch(...)
        {
          _M_deallocate_node(*(_M_finish._M_node + 1));
          __throw_exception_again;
        }
    }
  #endif
    
  // Called only if _M_start._M_cur == _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();
      *(_M_start._M_node - 1) = _M_allocate_node();
      try
        {
          _M_start._M_set_node(_M_start._M_node - 1);
          _M_start._M_cur = _M_start._M_last - 1;
          _Construct(_M_start._M_cur, __t_copy);
        }
      catch(...)
        {
          ++_M_start;
          _M_deallocate_node(*(_M_start._M_node - 1));
          __throw_exception_again;
        }
    } 
    
  #ifdef _GLIBCPP_DEPRECATED
  // Called only if _M_start._M_cur == _M_start._M_first.
  template <typename _Tp, typename _Alloc>
    void
    deque<_Tp,_Alloc>::
    _M_push_front_aux()
    {
      _M_reserve_map_at_front();
      *(_M_start._M_node - 1) = _M_allocate_node();
      try
        {
          _M_start._M_set_node(_M_start._M_node - 1);
          _M_start._M_cur = _M_start._M_last - 1;
          _Construct(_M_start._M_cur);
        }
      catch(...)
        {
          ++_M_start;
          _M_deallocate_node(*(_M_start._M_node - 1));
          __throw_exception_again;
        }
    } 
  #endif
    
  // Called only if _M_finish._M_cur == _M_finish._M_first.
  template <typename _Tp, typename _Alloc>
    void deque<_Tp,_Alloc>::
    _M_pop_back_aux()
    {
      _M_deallocate_node(_M_finish._M_first);
      _M_finish._M_set_node(_M_finish._M_node - 1);
      _M_finish._M_cur = _M_finish._M_last - 1;
      _Destroy(_M_finish._M_cur);
    }
    
  // Called only if _M_start._M_cur == _M_start._M_last - 1.  Note that 
  // if the deque has at least one element (a precondition for this member 
  // function), and if _M_start._M_cur == _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()
    {
      _Destroy(_M_start._M_cur);
      _M_deallocate_node(_M_start._M_first);
      _M_start._M_set_node(_M_start._M_node + 1);
      _M_start._M_cur = _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,
                          input_iterator_tag)
      {
        copy(__first, __last, 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,
                          forward_iterator_tag)
      {
        size_type __n = std::distance(__first, __last);
        if (__pos._M_cur == _M_start._M_cur)
        {
          iterator __new_start = _M_reserve_elements_at_front(__n);
          try
            {
              uninitialized_copy(__first, __last, __new_start);
              _M_start = __new_start;
            }
          catch(...)
            {
              _M_destroy_nodes(__new_start._M_node, _M_start._M_node);
              __throw_exception_again;
            }
        }
        else if (__pos._M_cur == _M_finish._M_cur)
        {
          iterator __new_finish = _M_reserve_elements_at_back(__n);
          try
            {
              uninitialized_copy(__first, __last, _M_finish);
              _M_finish = __new_finish;
            }
          catch(...)
            {
              _M_destroy_nodes(_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 - _M_start;
      value_type __x_copy = __x; // XXX copy
      if (static_cast<size_type>(__index) < size() / 2)
      {
        push_front(front());
        iterator __front1 = _M_start;
        ++__front1;
        iterator __front2 = __front1;
        ++__front2;
        __pos = _M_start + __index;
        iterator __pos1 = __pos;
        ++__pos1;
        copy(__front2, __pos1, __front1);
      }
      else
      {
        push_back(back());
        iterator __back1 = _M_finish;
        --__back1;
        iterator __back2 = __back1;
        --__back2;
        __pos = _M_start + __index;
        copy_backward(__pos, __back2, __back1);
      }
      *__pos = __x_copy;
      return __pos;
    }
    
  #ifdef _GLIBCPP_DEPRECATED
  // Nothing seems to actually use this.  According to the pattern followed by
  // the rest of the SGI code, it would be called by the deprecated insert(pos)
  // function, but that has been replaced.  We'll take our time removing this
  // anyhow; mark for 3.4.  -pme
  template <typename _Tp, typename _Alloc>
    typename deque<_Tp,_Alloc>::iterator 
    deque<_Tp,_Alloc>::
    _M_insert_aux(iterator __pos)
    {
      difference_type __index = __pos - _M_start;
      if (static_cast<size_type>(__index) < size() / 2)
      {
        push_front(front());
        iterator __front1 = _M_start;
        ++__front1;
        iterator __front2 = __front1;
        ++__front2;
        __pos = _M_start + __index;
        iterator __pos1 = __pos;
        ++__pos1;
        copy(__front2, __pos1, __front1);
      }
      else
      {
        push_back(back());
        iterator __back1 = _M_finish;
        --__back1;
        iterator __back2 = __back1;
        --__back2;
        __pos = _M_start + __index;
        copy_backward(__pos, __back2, __back1);
      }
      *__pos = value_type();
      return __pos;
    }
  #endif
    
  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 - _M_start;
      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 = _M_start;
        __pos = _M_start + __elems_before;
        try
          {
            if (__elems_before >= difference_type(__n))
            {
              iterator __start_n = _M_start + difference_type(__n);
              uninitialized_copy(_M_start, __start_n, __new_start);
              _M_start = __new_start;
              copy(__start_n, __pos, __old_start);
              fill(__pos - difference_type(__n), __pos, __x_copy);
            }
            else
            {
              __uninitialized_copy_fill(_M_start, __pos, __new_start, 
                                        _M_start, __x_copy);
              _M_start = __new_start;
              fill(__old_start, __pos, __x_copy);
            }
          }
        catch(...)
          { 
            _M_destroy_nodes(__new_start._M_node, _M_start._M_node);
            __throw_exception_again;
          }
      }
      else
      {
        iterator __new_finish = _M_reserve_elements_at_back(__n);
        iterator __old_finish = _M_finish;
        const difference_type __elems_after = 
          difference_type(__length) - __elems_before;
        __pos = _M_finish - __elems_after;
        try
          {
            if (__elems_after > difference_type(__n))
            {
              iterator __finish_n = _M_finish - difference_type(__n);
              uninitialized_copy(__finish_n, _M_finish, _M_finish);
              _M_finish = __new_finish;
              copy_backward(__pos, __finish_n, __old_finish);
              fill(__pos, __pos + difference_type(__n), __x_copy);
            }
            else
            {
              __uninitialized_fill_copy(_M_finish, __pos + difference_type(__n),
                                        __x_copy, __pos, _M_finish);
              _M_finish = __new_finish;
              fill(__pos, __old_finish, __x_copy);
            }
          }
        catch(...)
          { 
            _M_destroy_nodes(_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 - _M_start;
        size_type __length = size();
        if (static_cast<size_type>(__elemsbefore) < __length / 2)
        {
          iterator __new_start = _M_reserve_elements_at_front(__n);
          iterator __old_start = _M_start;
          __pos = _M_start + __elemsbefore;
          try
            {
              if (__elemsbefore >= difference_type(__n))
              {
                iterator __start_n = _M_start + difference_type(__n); 
                uninitialized_copy(_M_start, __start_n, __new_start);
                _M_start = __new_start;
                copy(__start_n, __pos, __old_start);
                copy(__first, __last, __pos - difference_type(__n));
              }
              else
              {
                _ForwardIterator __mid = __first;
                advance(__mid, difference_type(__n) - __elemsbefore);
                __uninitialized_copy_copy(_M_start, __pos, __first, __mid,
                                          __new_start);
                _M_start = __new_start;
                copy(__mid, __last, __old_start);
              }
            }
          catch(...)
            {
              _M_destroy_nodes(__new_start._M_node, _M_start._M_node);
              __throw_exception_again;
            }
        }
        else
        {
          iterator __new_finish = _M_reserve_elements_at_back(__n);
          iterator __old_finish = _M_finish;
          const difference_type __elemsafter = 
            difference_type(__length) - __elemsbefore;
          __pos = _M_finish - __elemsafter;
          try
            {
              if (__elemsafter > difference_type(__n))
              {
                iterator __finish_n = _M_finish - difference_type(__n);
                uninitialized_copy(__finish_n, _M_finish, _M_finish);
                _M_finish = __new_finish;
                copy_backward(__pos, __finish_n, __old_finish);
                copy(__first, __last, __pos);
              }
              else
              {
                _ForwardIterator __mid = __first;
                advance(__mid, __elemsafter);
                __uninitialized_copy_copy(__mid, __last, __pos,
                                          _M_finish, _M_finish);
                _M_finish = __new_finish;
                copy(__first, __mid, __pos);
              }
            }
          catch(...)
            {
              _M_destroy_nodes(_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)
    {
      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)
            *(_M_start._M_node - __i) = _M_allocate_node();
        }
      catch(...)
        {
          for (size_type __j = 1; __j < __i; ++__j)
            _M_deallocate_node(*(_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)
    {
      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)
            *(_M_finish._M_node + __i) = _M_allocate_node();
        }
      catch(...)
        {
          for (size_type __j = 1; __j < __i; ++__j)
            _M_deallocate_node(*(_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)
    {
      size_type __old_num_nodes = _M_finish._M_node - _M_start._M_node + 1;
      size_type __new_num_nodes = __old_num_nodes + __nodes_to_add;
    
      _Map_pointer __new_nstart;
      if (_M_map_size > 2 * __new_num_nodes)
      {
        __new_nstart = _M_map + (_M_map_size - __new_num_nodes) / 2 
                         + (__add_at_front ? __nodes_to_add : 0);
        if (__new_nstart < _M_start._M_node)
          copy(_M_start._M_node, _M_finish._M_node + 1, __new_nstart);
        else
          copy_backward(_M_start._M_node, _M_finish._M_node + 1, 
                        __new_nstart + __old_num_nodes);
      }
      else
      {
        size_type __new_map_size = 
          _M_map_size + std::max(_M_map_size, __nodes_to_add) + 2;
    
        _Map_pointer __new_map = _M_allocate_map(__new_map_size);
        __new_nstart = __new_map + (__new_map_size - __new_num_nodes) / 2
                             + (__add_at_front ? __nodes_to_add : 0);
        copy(_M_start._M_node, _M_finish._M_node + 1, __new_nstart);
        _M_deallocate_map(_M_map, _M_map_size);
    
        _M_map = __new_map;
        _M_map_size = __new_map_size;
      }
    
      _M_start._M_set_node(__new_nstart);
      _M_finish._M_set_node(__new_nstart + __old_num_nodes - 1);
    }
} // namespace std 
  
#endif /* __GLIBCPP_INTERNAL_DEQUE_TCC */