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Edit File : forward_list.tcc \| Size : 12.86 KB
// <forward_list.tcc> -- C++ -- // Copyright (C) 2008-2018 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/forward_list.tcc * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{forward_list} / #ifndef _FORWARD_LIST_TCC #define _FORWARD_LIST_TCC 1 namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION _GLIBCXX_BEGIN_NAMESPACE_CONTAINER template<typename _Tp, typename _Alloc> _Fwd_list_base<_Tp, _Alloc>:: _Fwd_list_base(_Fwd_list_base&& __lst, _Node_alloc_type&& __a) : _M_impl(std::move(__a)) { if (__lst._M_get_Node_allocator() == _M_get_Node_allocator()) this->_M_impl._M_head = std::move(__lst._M_impl._M_head); } template<typename _Tp, typename _Alloc> template<typename... _Args> _Fwd_list_node_base _Fwd_list_base<_Tp, _Alloc>:: _M_insert_after(const_iterator __pos, _Args&&... __args) { _Fwd_list_node_base* __to = const_cast<_Fwd_list_node_base>(__pos._M_node); _Node __thing = _M_create_node(std::forward<_Args>(__args)...); __thing->_M_next = __to->_M_next; __to->_M_next = __thing; return __to->_M_next; } template<typename _Tp, typename _Alloc> _Fwd_list_node_base* _Fwd_list_base<_Tp, _Alloc>:: _M_erase_after(_Fwd_list_node_base* __pos) { _Node* __curr = static_cast<_Node>(__pos->_M_next); __pos->_M_next = __curr->_M_next; _Node_alloc_traits::destroy(_M_get_Node_allocator(), __curr->_M_valptr()); __curr->~_Node(); _M_put_node(__curr); return __pos->_M_next; } template<typename _Tp, typename _Alloc> _Fwd_list_node_base _Fwd_list_base<_Tp, _Alloc>:: _M_erase_after(_Fwd_list_node_base* __pos, _Fwd_list_node_base* __last) { _Node* __curr = static_cast<_Node>(__pos->_M_next); while (__curr != __last) { _Node __temp = __curr; __curr = static_cast<_Node>(__curr->_M_next); _Node_alloc_traits::destroy(_M_get_Node_allocator(), __temp->_M_valptr()); __temp->~_Node(); _M_put_node(__temp); } __pos->_M_next = __last; return __last; } // Called by the range constructor to implement [23.3.4.2]/9 template<typename _Tp, typename _Alloc> template<typename _InputIterator> void forward_list<_Tp, _Alloc>:: _M_range_initialize(_InputIterator __first, _InputIterator __last) { _Node_base __to = &this->_M_impl._M_head; for (; __first != __last; ++__first) { __to->_M_next = this->_M_create_node(__first); __to = __to->_M_next; } } // Called by forward_list(n,v,a). template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: _M_fill_initialize(size_type __n, const value_type& __value) { _Node_base __to = &this->_M_impl._M_head; for (; __n; --__n) { __to->_M_next = this->_M_create_node(__value); __to = __to->_M_next; } } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: _M_default_initialize(size_type __n) { _Node_base* __to = &this->_M_impl._M_head; for (; __n; --__n) { __to->_M_next = this->_M_create_node(); __to = __to->_M_next; } } template<typename _Tp, typename _Alloc> forward_list<_Tp, _Alloc>& forward_list<_Tp, _Alloc>:: operator=(const forward_list& __list) { if (std::__addressof(__list) != this) { if (_Node_alloc_traits::_S_propagate_on_copy_assign()) { auto& __this_alloc = this->_M_get_Node_allocator(); auto& __that_alloc = __list._M_get_Node_allocator(); if (!_Node_alloc_traits::_S_always_equal() && __this_alloc != __that_alloc) { // replacement allocator cannot free existing storage clear(); } std::__alloc_on_copy(__this_alloc, __that_alloc); } assign(__list.cbegin(), __list.cend()); } return this; } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: _M_default_insert_after(const_iterator __pos, size_type __n) { const_iterator __saved_pos = __pos; __try { for (; __n; --__n) __pos = emplace_after(__pos); } __catch(...) { erase_after(__saved_pos, ++__pos); __throw_exception_again; } } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: resize(size_type __sz) { iterator __k = before_begin(); size_type __len = 0; while (__k._M_next() != end() && __len < __sz) { ++__k; ++__len; } if (__len == __sz) erase_after(__k, end()); else _M_default_insert_after(__k, __sz - __len); } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: resize(size_type __sz, const value_type& __val) { iterator __k = before_begin(); size_type __len = 0; while (__k._M_next() != end() && __len < __sz) { ++__k; ++__len; } if (__len == __sz) erase_after(__k, end()); else insert_after(__k, __sz - __len, __val); } template<typename _Tp, typename _Alloc> typename forward_list<_Tp, _Alloc>::iterator forward_list<_Tp, _Alloc>:: _M_splice_after(const_iterator __pos, const_iterator __before, const_iterator __last) { _Node_base __tmp = const_cast<_Node_base>(__pos._M_node); _Node_base __b = const_cast<_Node_base>(__before._M_node); _Node_base __end = __b; while (__end && __end->_M_next != __last._M_node) __end = __end->_M_next; if (__b != __end) return iterator(__tmp->_M_transfer_after(__b, __end)); else return iterator(__tmp); } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: splice_after(const_iterator __pos, forward_list&&, const_iterator __i) noexcept { const_iterator __j = __i; ++__j; if (__pos == __i \|\| __pos == __j) return; _Node_base* __tmp = const_cast<_Node_base>(__pos._M_node); __tmp->_M_transfer_after(const_cast<_Node_base>(__i._M_node), const_cast<_Node_base>(__j._M_node)); } template<typename _Tp, typename _Alloc> typename forward_list<_Tp, _Alloc>::iterator forward_list<_Tp, _Alloc>:: insert_after(const_iterator __pos, size_type __n, const _Tp& __val) { if (__n) { forward_list __tmp(__n, __val, get_allocator()); return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end()); } else return iterator(const_cast<_Node_base>(__pos._M_node)); } template<typename _Tp, typename _Alloc> template<typename _InputIterator, typename> typename forward_list<_Tp, _Alloc>::iterator forward_list<_Tp, _Alloc>:: insert_after(const_iterator __pos, _InputIterator __first, _InputIterator __last) { forward_list __tmp(__first, __last, get_allocator()); if (!__tmp.empty()) return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end()); else return iterator(const_cast<_Node_base>(__pos._M_node)); } template<typename _Tp, typename _Alloc> void forward_list<_Tp, _Alloc>:: remove(const _Tp& __val) { _Node_base __curr = &this->_M_impl._M_head; _Node_base* __extra = nullptr; while (_Node* __tmp = static_cast<_Node>(__curr->_M_next)) { if (__tmp->_M_valptr() == __val) { if (__tmp->_M_valptr() != std::__addressof(__val)) { this->_M_erase_after(__curr); continue; } else __extra = __curr; } __curr = __curr->_M_next; } if (__extra) this->_M_erase_after(__extra); } template<typename _Tp, typename _Alloc> template<typename _Pred> void forward_list<_Tp, _Alloc>:: remove_if(_Pred __pred) { _Node_base* __curr = &this->_M_impl._M_head; while (_Node* __tmp = static_cast<_Node>(__curr->_M_next)) { if (__pred(__tmp->_M_valptr())) this->_M_erase_after(__curr); else __curr = __curr->_M_next; } } template<typename _Tp, typename _Alloc> template<typename _BinPred> void forward_list<_Tp, _Alloc>:: unique(_BinPred __binary_pred) { iterator __first = begin(); iterator __last = end(); if (__first == __last) return; iterator __next = __first; while (++__next != __last) { if (__binary_pred(__first, __next)) erase_after(__first); else __first = __next; __next = __first; } } template<typename _Tp, typename _Alloc> template<typename _Comp> void forward_list<_Tp, _Alloc>:: merge(forward_list&& __list, _Comp __comp) { _Node_base* __node = &this->_M_impl._M_head; while (__node->_M_next && __list._M_impl._M_head._M_next) { if (__comp(static_cast<_Node> (__list._M_impl._M_head._M_next)->_M_valptr(), static_cast<_Node> (__node->_M_next)->_M_valptr())) __node->_M_transfer_after(&__list._M_impl._M_head, __list._M_impl._M_head._M_next); __node = __node->_M_next; } if (__list._M_impl._M_head._M_next) __node = std::move(__list._M_impl._M_head); } template<typename _Tp, typename _Alloc> bool operator==(const forward_list<_Tp, _Alloc>& __lx, const forward_list<_Tp, _Alloc>& __ly) { // We don't have size() so we need to walk through both lists // making sure both iterators are valid. auto __ix = __lx.cbegin(); auto __iy = __ly.cbegin(); while (__ix != __lx.cend() && __iy != __ly.cend()) { if (!(__ix == __iy)) return false; ++__ix; ++__iy; } if (__ix == __lx.cend() && __iy == __ly.cend()) return true; else return false; } template<typename _Tp, class _Alloc> template<typename _Comp> void forward_list<_Tp, _Alloc>:: sort(_Comp __comp) { // If `next' is nullptr, return immediately. _Node __list = static_cast<_Node>(this->_M_impl._M_head._M_next); if (!__list) return; unsigned long __insize = 1; while (1) { _Node __p = __list; __list = nullptr; _Node* __tail = nullptr; // Count number of merges we do in this pass. unsigned long __nmerges = 0; while (__p) { ++__nmerges; // There exists a merge to be done. // Step `insize' places along from p. _Node* __q = __p; unsigned long __psize = 0; for (unsigned long __i = 0; __i < __insize; ++__i) { ++__psize; __q = static_cast<_Node>(__q->_M_next); if (!__q) break; } // If q hasn't fallen off end, we have two lists to merge. unsigned long __qsize = __insize; // Now we have two lists; merge them. while (__psize > 0 \|\| (__qsize > 0 && __q)) { // Decide whether next node of merge comes from p or q. _Node __e; if (__psize == 0) { // p is empty; e must come from q. __e = __q; __q = static_cast<_Node>(__q->_M_next); --__qsize; } else if (__qsize == 0 \|\| !__q) { // q is empty; e must come from p. __e = __p; __p = static_cast<_Node>(__p->_M_next); --__psize; } else if (!__comp(__q->_M_valptr(), __p->_M_valptr())) { // First node of q is not lower; e must come from p. __e = __p; __p = static_cast<_Node>(__p->_M_next); --__psize; } else { // First node of q is lower; e must come from q. __e = __q; __q = static_cast<_Node>(__q->_M_next); --__qsize; } // Add the next node to the merged list. if (__tail) __tail->_M_next = __e; else __list = __e; __tail = __e; } // Now p has stepped `insize' places along, and q has too. __p = __q; } __tail->_M_next = nullptr; // If we have done only one merge, we're finished. // Allow for nmerges == 0, the empty list case. if (__nmerges <= 1) { this->_M_impl._M_head._M_next = __list; return; } // Otherwise repeat, merging lists twice the size. __insize = 2; } } _GLIBCXX_END_NAMESPACE_CONTAINER _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif / _FORWARD_LIST_TCC */ Back

Edit File : forward_list.tcc | Size : 12.86 KB

// <forward_list.tcc> -*- C++ -*-

// Copyright (C) 2008-2018 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/forward_list.tcc
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{forward_list}
 */

#ifndef _FORWARD_LIST_TCC
#define _FORWARD_LIST_TCC 1

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
_GLIBCXX_BEGIN_NAMESPACE_CONTAINER

template<typename _Tp, typename _Alloc>
    _Fwd_list_base<_Tp, _Alloc>::
    _Fwd_list_base(_Fwd_list_base&& __lst, _Node_alloc_type&& __a)
    : _M_impl(std::move(__a))
    {
      if (__lst._M_get_Node_allocator() == _M_get_Node_allocator())
	this->_M_impl._M_head = std::move(__lst._M_impl._M_head);
    }

template<typename _Tp, typename _Alloc>
    template<typename... _Args>
      _Fwd_list_node_base*
      _Fwd_list_base<_Tp, _Alloc>::
      _M_insert_after(const_iterator __pos, _Args&&... __args)
      {
	_Fwd_list_node_base* __to
	  = const_cast<_Fwd_list_node_base*>(__pos._M_node);
	_Node* __thing = _M_create_node(std::forward<_Args>(__args)...);
	__thing->_M_next = __to->_M_next;
	__to->_M_next = __thing;
	return __to->_M_next;
      }

template<typename _Tp, typename _Alloc>
    _Fwd_list_node_base*
    _Fwd_list_base<_Tp, _Alloc>::
    _M_erase_after(_Fwd_list_node_base* __pos)
    {
      _Node* __curr = static_cast<_Node*>(__pos->_M_next);
      __pos->_M_next = __curr->_M_next;
      _Node_alloc_traits::destroy(_M_get_Node_allocator(),
				  __curr->_M_valptr());
      __curr->~_Node();
      _M_put_node(__curr);
      return __pos->_M_next;
    }

template<typename _Tp, typename _Alloc>
    _Fwd_list_node_base*
    _Fwd_list_base<_Tp, _Alloc>::
    _M_erase_after(_Fwd_list_node_base* __pos,
		   _Fwd_list_node_base* __last)
    {
      _Node* __curr = static_cast<_Node*>(__pos->_M_next);
      while (__curr != __last)
	{
	  _Node* __temp = __curr;
	  __curr = static_cast<_Node*>(__curr->_M_next);
	  _Node_alloc_traits::destroy(_M_get_Node_allocator(),
				      __temp->_M_valptr());
	  __temp->~_Node();
	  _M_put_node(__temp);
	}
      __pos->_M_next = __last;
      return __last;
    }

// Called by the range constructor to implement [23.3.4.2]/9
  template<typename _Tp, typename _Alloc>
    template<typename _InputIterator>
      void
      forward_list<_Tp, _Alloc>::
      _M_range_initialize(_InputIterator __first, _InputIterator __last)
      {
	_Node_base* __to = &this->_M_impl._M_head;
	for (; __first != __last; ++__first)
	  {
	    __to->_M_next = this->_M_create_node(*__first);
	    __to = __to->_M_next;
	  }
      }

// Called by forward_list(n,v,a).
  template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    _M_fill_initialize(size_type __n, const value_type& __value)
    {
      _Node_base* __to = &this->_M_impl._M_head;
      for (; __n; --__n)
	{
	  __to->_M_next = this->_M_create_node(__value);
	  __to = __to->_M_next;
	}
    }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    _M_default_initialize(size_type __n)
    {
      _Node_base* __to = &this->_M_impl._M_head;
      for (; __n; --__n)
	{
	  __to->_M_next = this->_M_create_node();
	  __to = __to->_M_next;
	}
    }

template<typename _Tp, typename _Alloc>
    forward_list<_Tp, _Alloc>&
    forward_list<_Tp, _Alloc>::
    operator=(const forward_list& __list)
    {
      if (std::__addressof(__list) != this)
	{
	  if (_Node_alloc_traits::_S_propagate_on_copy_assign())
	    {
	      auto& __this_alloc = this->_M_get_Node_allocator();
	      auto& __that_alloc = __list._M_get_Node_allocator();
	      if (!_Node_alloc_traits::_S_always_equal()
		  && __this_alloc != __that_alloc)
		{
		  // replacement allocator cannot free existing storage
		  clear();
		}
	      std::__alloc_on_copy(__this_alloc, __that_alloc);
	    }
	  assign(__list.cbegin(), __list.cend());
	}
      return *this;
    }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    _M_default_insert_after(const_iterator __pos, size_type __n)
    {
      const_iterator __saved_pos = __pos;
      __try
	{
	  for (; __n; --__n)
	    __pos = emplace_after(__pos);
	}
      __catch(...)
	{
	  erase_after(__saved_pos, ++__pos);
	  __throw_exception_again;
	}
    }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    resize(size_type __sz)
    {
      iterator __k = before_begin();

size_type __len = 0;
      while (__k._M_next() != end() && __len < __sz)
	{
	  ++__k;
	  ++__len;
	}
      if (__len == __sz)
	erase_after(__k, end());
      else
	_M_default_insert_after(__k, __sz - __len);
    }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    resize(size_type __sz, const value_type& __val)
    {
      iterator __k = before_begin();

size_type __len = 0;
      while (__k._M_next() != end() && __len < __sz)
	{
	  ++__k;
	  ++__len;
	}
      if (__len == __sz)
	erase_after(__k, end());
      else
	insert_after(__k, __sz - __len, __val);
    }

template<typename _Tp, typename _Alloc>
    typename forward_list<_Tp, _Alloc>::iterator
    forward_list<_Tp, _Alloc>::
    _M_splice_after(const_iterator __pos,
		    const_iterator __before, const_iterator __last)
    {
      _Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
      _Node_base* __b = const_cast<_Node_base*>(__before._M_node);
      _Node_base* __end = __b;

while (__end && __end->_M_next != __last._M_node)
	__end = __end->_M_next;

if (__b != __end)
	return iterator(__tmp->_M_transfer_after(__b, __end));
      else
	return iterator(__tmp);
    }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    splice_after(const_iterator __pos, forward_list&&,
		 const_iterator __i) noexcept
    {
      const_iterator __j = __i;
      ++__j;

if (__pos == __i || __pos == __j)
	return;

_Node_base* __tmp = const_cast<_Node_base*>(__pos._M_node);
      __tmp->_M_transfer_after(const_cast<_Node_base*>(__i._M_node),
			       const_cast<_Node_base*>(__j._M_node));
    }

template<typename _Tp, typename _Alloc>
    typename forward_list<_Tp, _Alloc>::iterator
    forward_list<_Tp, _Alloc>::
    insert_after(const_iterator __pos, size_type __n, const _Tp& __val)
    {
      if (__n)
	{
	  forward_list __tmp(__n, __val, get_allocator());
	  return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
	}
      else
	return iterator(const_cast<_Node_base*>(__pos._M_node));
    }

template<typename _Tp, typename _Alloc>
    template<typename _InputIterator, typename>
      typename forward_list<_Tp, _Alloc>::iterator
      forward_list<_Tp, _Alloc>::
      insert_after(const_iterator __pos,
		   _InputIterator __first, _InputIterator __last)
      {
	forward_list __tmp(__first, __last, get_allocator());
	if (!__tmp.empty())
	  return _M_splice_after(__pos, __tmp.before_begin(), __tmp.end());
	else
	  return iterator(const_cast<_Node_base*>(__pos._M_node));
      }

template<typename _Tp, typename _Alloc>
    void
    forward_list<_Tp, _Alloc>::
    remove(const _Tp& __val)
    {
      _Node_base* __curr = &this->_M_impl._M_head;
      _Node_base* __extra = nullptr;

while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
	{
	  if (*__tmp->_M_valptr() == __val)
	    {
	      if (__tmp->_M_valptr() != std::__addressof(__val))
		{
		  this->_M_erase_after(__curr);
		  continue;
		}
	      else
		__extra = __curr;
	    }
	  __curr = __curr->_M_next;
	}

if (__extra)
	this->_M_erase_after(__extra);
    }

template<typename _Tp, typename _Alloc>
    template<typename _Pred>
      void
      forward_list<_Tp, _Alloc>::
      remove_if(_Pred __pred)
      {
	_Node_base* __curr = &this->_M_impl._M_head;
	while (_Node* __tmp = static_cast<_Node*>(__curr->_M_next))
	  {
	    if (__pred(*__tmp->_M_valptr()))
	      this->_M_erase_after(__curr);
	    else
	      __curr = __curr->_M_next;
	  }
      }

template<typename _Tp, typename _Alloc>
    template<typename _BinPred>
      void
      forward_list<_Tp, _Alloc>::
      unique(_BinPred __binary_pred)
      {
	iterator __first = begin();
	iterator __last = end();
	if (__first == __last)
	  return;
	iterator __next = __first;
	while (++__next != __last)
	{
	  if (__binary_pred(*__first, *__next))
	    erase_after(__first);
	  else
	    __first = __next;
	  __next = __first;
	}
      }

template<typename _Tp, typename _Alloc>
    template<typename _Comp>
      void
      forward_list<_Tp, _Alloc>::
      merge(forward_list&& __list, _Comp __comp)
      {
	_Node_base* __node = &this->_M_impl._M_head;
	while (__node->_M_next && __list._M_impl._M_head._M_next)
	  {
	    if (__comp(*static_cast<_Node*>
		       (__list._M_impl._M_head._M_next)->_M_valptr(),
		       *static_cast<_Node*>
		       (__node->_M_next)->_M_valptr()))
	      __node->_M_transfer_after(&__list._M_impl._M_head,
					__list._M_impl._M_head._M_next);
	    __node = __node->_M_next;
	  }

if (__list._M_impl._M_head._M_next)
	  *__node = std::move(__list._M_impl._M_head);
      }

template<typename _Tp, typename _Alloc>
    bool
    operator==(const forward_list<_Tp, _Alloc>& __lx,
	       const forward_list<_Tp, _Alloc>& __ly)
    {
      //  We don't have size() so we need to walk through both lists
      //  making sure both iterators are valid.
      auto __ix = __lx.cbegin();
      auto __iy = __ly.cbegin();
      while (__ix != __lx.cend() && __iy != __ly.cend())
	{
	  if (!(*__ix == *__iy))
	    return false;
	  ++__ix;
	  ++__iy;
	}
      if (__ix == __lx.cend() && __iy == __ly.cend())
	return true;
      else
	return false;
    }

template<typename _Tp, class _Alloc>
    template<typename _Comp>
      void
      forward_list<_Tp, _Alloc>::
      sort(_Comp __comp)
      {
	// If `next' is nullptr, return immediately.
	_Node* __list = static_cast<_Node*>(this->_M_impl._M_head._M_next);
	if (!__list)
	  return;

unsigned long __insize = 1;

while (1)
	  {
	    _Node* __p = __list;
	    __list = nullptr;
	    _Node* __tail = nullptr;

// Count number of merges we do in this pass.
	    unsigned long __nmerges = 0;

while (__p)
	      {
		++__nmerges;
		// There exists a merge to be done.
		// Step `insize' places along from p.
		_Node* __q = __p;
		unsigned long __psize = 0;
		for (unsigned long __i = 0; __i < __insize; ++__i)
		  {
		    ++__psize;
		    __q = static_cast<_Node*>(__q->_M_next);
		    if (!__q)
		      break;
		  }

// If q hasn't fallen off end, we have two lists to merge.
		unsigned long __qsize = __insize;

// Now we have two lists; merge them.
		while (__psize > 0 || (__qsize > 0 && __q))
		  {
		    // Decide whether next node of merge comes from p or q.
		    _Node* __e;
		    if (__psize == 0)
		      {
			// p is empty; e must come from q.
			__e = __q;
			__q = static_cast<_Node*>(__q->_M_next);
			--__qsize;
		      }
		    else if (__qsize == 0 || !__q)
		      {
			// q is empty; e must come from p.
			__e = __p;
			__p = static_cast<_Node*>(__p->_M_next);
			--__psize;
		      }
		    else if (!__comp(*__q->_M_valptr(), *__p->_M_valptr()))
		      {
			// First node of q is not lower; e must come from p.
			__e = __p;
			__p = static_cast<_Node*>(__p->_M_next);
			--__psize;
		      }
		    else
		      {
			// First node of q is lower; e must come from q.
			__e = __q;
			__q = static_cast<_Node*>(__q->_M_next);
			--__qsize;
		      }

// Add the next node to the merged list.
		    if (__tail)
		      __tail->_M_next = __e;
		    else
		      __list = __e;
		    __tail = __e;
		  }

// Now p has stepped `insize' places along, and q has too.
		__p = __q;
	      }
	    __tail->_M_next = nullptr;

// If we have done only one merge, we're finished.
	    // Allow for nmerges == 0, the empty list case.
	    if (__nmerges <= 1)
	      {
		this->_M_impl._M_head._M_next = __list;
		return;
	      }

// Otherwise repeat, merging lists twice the size.
	    __insize *= 2;
	  }
      }

_GLIBCXX_END_NAMESPACE_CONTAINER
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif /* _FORWARD_LIST_TCC */

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