<h2>Editing File: /usr/include/c++/8/debug/list</h2><form method='post'><textarea name='content' class='file-edit'>// Debugging list implementation -*- C++ -*-

// Copyright (C) 2003-2018 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
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file debug/list
 *  This file is a GNU debug extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_DEBUG_LIST
#define _GLIBCXX_DEBUG_LIST 1

#pragma GCC system_header

#include &lt;list&gt;
#include &lt;debug/safe_sequence.h&gt;
#include &lt;debug/safe_container.h&gt;
#include &lt;debug/safe_iterator.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
  /// Class std::list with safety/checking/debug instrumentation.
  template&lt;typename _Tp, typename _Allocator = std::allocator&lt;_Tp&gt; &gt;
    class list
    : public __gnu_debug::_Safe_container&lt;
	list&lt;_Tp, _Allocator&gt;, _Allocator,
	__gnu_debug::_Safe_node_sequence&gt;,
      public _GLIBCXX_STD_C::list&lt;_Tp, _Allocator&gt;
    {
      typedef _GLIBCXX_STD_C::list&lt;_Tp, _Allocator&gt;		_Base;
      typedef __gnu_debug::_Safe_container&lt;
	list, _Allocator, __gnu_debug::_Safe_node_sequence&gt;	_Safe;

      typedef typename _Base::iterator		_Base_iterator;
      typedef typename _Base::const_iterator	_Base_const_iterator;
      typedef __gnu_debug::_Equal_to&lt;_Base_const_iterator&gt;	_Equal;
      typedef __gnu_debug::_Not_equal_to&lt;_Base_const_iterator&gt;  _Not_equal;

    public:
      typedef typename _Base::reference			reference;
      typedef typename _Base::const_reference		const_reference;

      typedef __gnu_debug::_Safe_iterator&lt;_Base_iterator, list&gt;
							iterator;
      typedef __gnu_debug::_Safe_iterator&lt;_Base_const_iterator, list&gt;
							const_iterator;

      typedef typename _Base::size_type			size_type;
      typedef typename _Base::difference_type		difference_type;

      typedef _Tp					value_type;
      typedef _Allocator				allocator_type;
      typedef typename _Base::pointer			pointer;
      typedef typename _Base::const_pointer		const_pointer;
      typedef std::reverse_iterator&lt;iterator&gt;		reverse_iterator;
      typedef std::reverse_iterator&lt;const_iterator&gt;	const_reverse_iterator;

      // 23.2.2.1 construct/copy/destroy:

#if __cplusplus &lt; 201103L
      list()
      : _Base() { }

      list(const list&amp; __x)
      : _Base(__x) { }

      ~list() { }
#else
      list() = default;
      list(const list&amp;) = default;
      list(list&amp;&amp;) = default;

      list(initializer_list&lt;value_type&gt; __l,
	   const allocator_type&amp; __a = allocator_type())
      : _Base(__l, __a) { }

      ~list() = default;

      list(const list&amp; __x, const allocator_type&amp; __a)
      : _Base(__x, __a) { }

      list(list&amp;&amp; __x, const allocator_type&amp; __a)
      : _Base(std::move(__x), __a) { }
#endif

      explicit
      list(const _Allocator&amp; __a) _GLIBCXX_NOEXCEPT
      : _Base(__a) { }

#if __cplusplus &gt;= 201103L
      explicit
      list(size_type __n, const allocator_type&amp; __a = allocator_type())
      : _Base(__n, __a) { }

      list(size_type __n, const _Tp&amp; __value,
	   const _Allocator&amp; __a = _Allocator())
      : _Base(__n, __value, __a) { }
#else
      explicit
      list(size_type __n, const _Tp&amp; __value = _Tp(),
	   const _Allocator&amp; __a = _Allocator())
      : _Base(__n, __value, __a) { }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
#else
      template&lt;class _InputIterator&gt;
#endif
	list(_InputIterator __first, _InputIterator __last,
	     const _Allocator&amp; __a = _Allocator())
	: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
								     __last)),
		__gnu_debug::__base(__last), __a)
	{ }

      list(const _Base&amp; __x)
      : _Base(__x) { }

#if __cplusplus &lt; 201103L
      list&amp;
      operator=(const list&amp; __x)
      {
	this-&gt;_M_safe() = __x;
	_M_base() = __x;
	return *this;
      }
#else
      list&amp;
      operator=(const list&amp;) = default;

      list&amp;
      operator=(list&amp;&amp;) = default;

      list&amp;
      operator=(initializer_list&lt;value_type&gt; __l)
      {
	this-&gt;_M_invalidate_all();
	_M_base() = __l;
	return *this;
      }

      void
      assign(initializer_list&lt;value_type&gt; __l)
      {
	_Base::assign(__l);
	this-&gt;_M_invalidate_all();
      }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
#else
      template&lt;class _InputIterator&gt;
#endif
	void
	assign(_InputIterator __first, _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_valid_range2(__first, __last, __dist);

	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    _Base::assign(__gnu_debug::__unsafe(__first),
			  __gnu_debug::__unsafe(__last));
	  else
	    _Base::assign(__first, __last);

	  this-&gt;_M_invalidate_all();
	}

      void
      assign(size_type __n, const _Tp&amp; __t)
      {
	_Base::assign(__n, __t);
	this-&gt;_M_invalidate_all();
      }

      using _Base::get_allocator;

      // iterators:
      iterator
      begin() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::begin(), this); }

      const_iterator
      begin() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::begin(), this); }

      iterator
      end() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::end(), this); }

      const_iterator
      end() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::end(), this); }

      reverse_iterator
      rbegin() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(end()); }

      const_reverse_iterator
      rbegin() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(end()); }

      reverse_iterator
      rend() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(begin()); }

      const_reverse_iterator
      rend() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(begin()); }

#if __cplusplus &gt;= 201103L
      const_iterator
      cbegin() const noexcept
      { return const_iterator(_Base::begin(), this); }

      const_iterator
      cend() const noexcept
      { return const_iterator(_Base::end(), this); }

      const_reverse_iterator
      crbegin() const noexcept
      { return const_reverse_iterator(end()); }

      const_reverse_iterator
      crend() const noexcept
      { return const_reverse_iterator(begin()); }
#endif

      // 23.2.2.2 capacity:
      using _Base::empty;
      using _Base::size;
      using _Base::max_size;

#if __cplusplus &gt;= 201103L
      void
      resize(size_type __sz)
      {
	this-&gt;_M_detach_singular();

	// if __sz &lt; size(), invalidate all iterators in [begin + __sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end &amp;&amp; __i &gt; 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  this-&gt;_M_invalidate_if(_Equal(__victim));

	__try
	  {
	    _Base::resize(__sz);
	  }
	__catch(...)
	  {
	    this-&gt;_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }

      void
      resize(size_type __sz, const _Tp&amp; __c)
      {
	this-&gt;_M_detach_singular();

	// if __sz &lt; size(), invalidate all iterators in [begin + __sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end &amp;&amp; __i &gt; 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  this-&gt;_M_invalidate_if(_Equal(__victim));

	__try
	  {
	    _Base::resize(__sz, __c);
	  }
	__catch(...)
	  {
	    this-&gt;_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }
#else
      void
      resize(size_type __sz, _Tp __c = _Tp())
      {
	this-&gt;_M_detach_singular();

	// if __sz &lt; size(), invalidate all iterators in [begin + __sz, end())
	_Base_iterator __victim = _Base::begin();
	_Base_iterator __end = _Base::end();
	for (size_type __i = __sz; __victim != __end &amp;&amp; __i &gt; 0; --__i)
	  ++__victim;

	for (; __victim != __end; ++__victim)
	  this-&gt;_M_invalidate_if(_Equal(__victim));

	__try
	  {
	    _Base::resize(__sz, __c);
	  }
	__catch(...)
	  {
	    this-&gt;_M_revalidate_singular();
	    __throw_exception_again;
	  }
      }
#endif

      // element access:
      reference
      front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      const_reference
      front() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      reference
      back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      const_reference
      back() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      // 23.2.2.3 modifiers:
      using _Base::push_front;

#if __cplusplus &gt;= 201103L
      using _Base::emplace_front;
#endif

      void
      pop_front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this-&gt;_M_invalidate_if(_Equal(_Base::begin()));
	_Base::pop_front();
      }

      using _Base::push_back;

#if __cplusplus &gt;= 201103L
      using _Base::emplace_back;
#endif

      void
      pop_back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this-&gt;_M_invalidate_if(_Equal(--_Base::end()));
	_Base::pop_back();
      }

#if __cplusplus &gt;= 201103L
      template&lt;typename... _Args&gt;
	iterator
	emplace(const_iterator __position, _Args&amp;&amp;... __args)
	{
	  __glibcxx_check_insert(__position);
	  return iterator(_Base::emplace(__position.base(),
					std::forward&lt;_Args&gt;(__args)...), this);
	}
#endif

     iterator
#if __cplusplus &gt;= 201103L
     insert(const_iterator __position, const _Tp&amp; __x)
#else
     insert(iterator __position, const _Tp&amp; __x)
#endif
     {
       __glibcxx_check_insert(__position);
       return iterator(_Base::insert(__position.base(), __x), this);
     }

#if __cplusplus &gt;= 201103L
      iterator
      insert(const_iterator __position, _Tp&amp;&amp; __x)
      { return emplace(__position, std::move(__x)); }

      iterator
      insert(const_iterator __p, initializer_list&lt;value_type&gt; __l)
      {
	__glibcxx_check_insert(__p);
	return iterator(_Base::insert(__p.base(), __l), this);
      }
#endif

#if __cplusplus &gt;= 201103L
      iterator
      insert(const_iterator __position, size_type __n, const _Tp&amp; __x)
      {
	__glibcxx_check_insert(__position);
	return iterator(_Base::insert(__position.base(), __n, __x), this);
      }
#else
      void
      insert(iterator __position, size_type __n, const _Tp&amp; __x)
      {
	__glibcxx_check_insert(__position);
	_Base::insert(__position.base(), __n, __x);
      }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
	iterator
	insert(const_iterator __position, _InputIterator __first,
	       _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_insert_range(__position, __first, __last, __dist);
	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    return
	      {
		_Base::insert(__position.base(),
			      __gnu_debug::__unsafe(__first),
			      __gnu_debug::__unsafe(__last)),
		  this
	      };
	  else
	    return { _Base::insert(__position.base(), __first, __last), this };
	}
#else
      template&lt;class _InputIterator&gt;
	void
	insert(iterator __position, _InputIterator __first,
	       _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_insert_range(__position, __first, __last, __dist);

	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    _Base::insert(__position.base(), __gnu_debug::__unsafe(__first),
					     __gnu_debug::__unsafe(__last));
	  else
	    _Base::insert(__position.base(), __first, __last);
	}
#endif

    private:
      _Base_iterator
#if __cplusplus &gt;= 201103L
      _M_erase(_Base_const_iterator __position) noexcept
#else
      _M_erase(_Base_iterator __position)
#endif
      {
	this-&gt;_M_invalidate_if(_Equal(__position));
	return _Base::erase(__position);
      }

    public:
      iterator
#if __cplusplus &gt;= 201103L
      erase(const_iterator __position) noexcept
#else
      erase(iterator __position)
#endif
      {
	__glibcxx_check_erase(__position);
	return iterator(_M_erase(__position.base()), this);
      }

      iterator
#if __cplusplus &gt;= 201103L
      erase(const_iterator __first, const_iterator __last) noexcept
#else
      erase(iterator __first, iterator __last)
#endif
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 151. can't currently clear() empty container
	__glibcxx_check_erase_range(__first, __last);
	for (_Base_const_iterator __victim = __first.base();
	     __victim != __last.base(); ++__victim)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
				  _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, &quot;position&quot;)
				  ._M_iterator(__last, &quot;last&quot;));
	    this-&gt;_M_invalidate_if(_Equal(__victim));
	  }
	return iterator(_Base::erase(__first.base(), __last.base()), this);
      }

      void
      swap(list&amp; __x)
      _GLIBCXX_NOEXCEPT_IF( noexcept(declval&lt;_Base&amp;&gt;().swap(__x)) )
      {
	_Safe::_M_swap(__x);
	_Base::swap(__x);
      }

      void
      clear() _GLIBCXX_NOEXCEPT
      {
	_Base::clear();
	this-&gt;_M_invalidate_all();
      }

      // 23.2.2.4 list operations:
      void
#if __cplusplus &gt;= 201103L
      splice(const_iterator __position, list&amp;&amp; __x) noexcept
#else
      splice(iterator __position, list&amp; __x)
#endif
      {
	_GLIBCXX_DEBUG_VERIFY(std::__addressof(__x) != this,
			      _M_message(__gnu_debug::__msg_self_splice)
			      ._M_sequence(*this, &quot;this&quot;));
	this-&gt;_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()));
      }

#if __cplusplus &gt;= 201103L
      void
      splice(const_iterator __position, list&amp; __x) noexcept
      { splice(__position, std::move(__x)); }
#endif

      void
#if __cplusplus &gt;= 201103L
      splice(const_iterator __position, list&amp;&amp; __x, const_iterator __i) noexcept
#else
      splice(iterator __position, list&amp; __x, iterator __i)
#endif
      {
	__glibcxx_check_insert(__position);

	// We used to perform the splice_alloc check:  not anymore, redundant
	// after implementing the relevant bits of N1599.

	_GLIBCXX_DEBUG_VERIFY(__i._M_dereferenceable(),
			      _M_message(__gnu_debug::__msg_splice_bad)
			      ._M_iterator(__i, &quot;__i&quot;));
	_GLIBCXX_DEBUG_VERIFY(__i._M_attached_to(std::__addressof(__x)),
			      _M_message(__gnu_debug::__msg_splice_other)
			     ._M_iterator(__i, &quot;__i&quot;)._M_sequence(__x, &quot;__x&quot;));

	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 250. splicing invalidates iterators
	this-&gt;_M_transfer_from_if(__x, _Equal(__i.base()));
	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()),
		      __i.base());
      }

#if __cplusplus &gt;= 201103L
      void
      splice(const_iterator __position, list&amp; __x, const_iterator __i) noexcept
      { splice(__position, std::move(__x), __i); }
#endif

      void
#if __cplusplus &gt;= 201103L
      splice(const_iterator __position, list&amp;&amp; __x, const_iterator __first,
	     const_iterator __last) noexcept
#else
      splice(iterator __position, list&amp; __x, iterator __first,
	     iterator __last)
#endif
      {
	__glibcxx_check_insert(__position);
	__glibcxx_check_valid_range(__first, __last);
	_GLIBCXX_DEBUG_VERIFY(__first._M_attached_to(std::__addressof(__x)),
			      _M_message(__gnu_debug::__msg_splice_other)
			      ._M_sequence(__x, &quot;x&quot;)
			      ._M_iterator(__first, &quot;first&quot;));

	// We used to perform the splice_alloc check:  not anymore, redundant
	// after implementing the relevant bits of N1599.

	for (_Base_const_iterator __tmp = __first.base();
	     __tmp != __last.base(); ++__tmp)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__tmp != _Base::end(),
				  _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, &quot;first&quot;)
				  ._M_iterator(__last, &quot;last&quot;));
	    _GLIBCXX_DEBUG_VERIFY(std::__addressof(__x) != this
				  || __tmp != __position.base(),
				_M_message(__gnu_debug::__msg_splice_overlap)
				  ._M_iterator(__tmp, &quot;position&quot;)
				  ._M_iterator(__first, &quot;first&quot;)
				  ._M_iterator(__last, &quot;last&quot;));
	    // _GLIBCXX_RESOLVE_LIB_DEFECTS
	    // 250. splicing invalidates iterators
	    this-&gt;_M_transfer_from_if(__x, _Equal(__tmp));
	  }

	_Base::splice(__position.base(), _GLIBCXX_MOVE(__x._M_base()),
		      __first.base(), __last.base());
      }

#if __cplusplus &gt;= 201103L
      void
      splice(const_iterator __position, list&amp; __x,
	     const_iterator __first, const_iterator __last) noexcept
      { splice(__position, std::move(__x), __first, __last); }
#endif

      void
      remove(const _Tp&amp; __value)
      {
	for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
	  {
	    if (*__x == __value)
	      __x = _M_erase(__x);
	    else
	      ++__x;
	  }
      }

      template&lt;class _Predicate&gt;
	void
	remove_if(_Predicate __pred)
	{
	  for (_Base_iterator __x = _Base::begin(); __x != _Base::end(); )
	    {
	      if (__pred(*__x))
		__x = _M_erase(__x);
	      else
		++__x;
	    }
	}

      void
      unique()
      {
	_Base_iterator __first = _Base::begin();
	_Base_iterator __last = _Base::end();
	if (__first == __last)
	  return;
	_Base_iterator __next = __first; ++__next;
	while (__next != __last)
	  {
	    if (*__first == *__next)
	      __next = _M_erase(__next);
	    else
	      __first = __next++;
	  }
      }

      template&lt;class _BinaryPredicate&gt;
	void
	unique(_BinaryPredicate __binary_pred)
	{
	  _Base_iterator __first = _Base::begin();
	  _Base_iterator __last = _Base::end();
	  if (__first == __last)
	    return;
	  _Base_iterator __next = __first; ++__next;
	  while (__next != __last)
	    {
	      if (__binary_pred(*__first, *__next))
		__next = _M_erase(__next);
	      else
		__first = __next++;
	    }
	}

      void
#if __cplusplus &gt;= 201103L
      merge(list&amp;&amp; __x)
#else
      merge(list&amp; __x)
#endif
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 300. list::merge() specification incomplete
	if (this != std::__addressof(__x))
	  {
	    __glibcxx_check_sorted(_Base::begin(), _Base::end());
	    __glibcxx_check_sorted(__x.begin().base(), __x.end().base());
	    this-&gt;_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	    _Base::merge(_GLIBCXX_MOVE(__x._M_base()));
	  }
      }

#if __cplusplus &gt;= 201103L
      void
      merge(list&amp; __x)
      { merge(std::move(__x)); }
#endif

      template&lt;class _Compare&gt;
	void
#if __cplusplus &gt;= 201103L
	merge(list&amp;&amp; __x, _Compare __comp)
#else
	merge(list&amp; __x, _Compare __comp)
#endif
	{
	  // _GLIBCXX_RESOLVE_LIB_DEFECTS
	  // 300. list::merge() specification incomplete
	  if (this != std::__addressof(__x))
	    {
	      __glibcxx_check_sorted_pred(_Base::begin(), _Base::end(),
					  __comp);
	      __glibcxx_check_sorted_pred(__x.begin().base(), __x.end().base(),
					  __comp);
	      this-&gt;_M_transfer_from_if(__x, _Not_equal(__x._M_base().end()));
	      _Base::merge(_GLIBCXX_MOVE(__x._M_base()), __comp);
	    }
	}

#if __cplusplus &gt;= 201103L
      template&lt;typename _Compare&gt;
	void
	merge(list&amp; __x, _Compare __comp)
	{ merge(std::move(__x), __comp); }
#endif

      void
      sort() { _Base::sort(); }

      template&lt;typename _StrictWeakOrdering&gt;
	void
	sort(_StrictWeakOrdering __pred) { _Base::sort(__pred); }

      using _Base::reverse;

      _Base&amp;
      _M_base() _GLIBCXX_NOEXCEPT	{ return *this; }

      const _Base&amp;
      _M_base() const _GLIBCXX_NOEXCEPT	{ return *this; }
    };

#if __cpp_deduction_guides &gt;= 201606
  template&lt;typename _InputIterator, typename _ValT
	     = typename iterator_traits&lt;_InputIterator&gt;::value_type,
	   typename _Allocator = allocator&lt;_ValT&gt;,
	   typename = _RequireInputIter&lt;_InputIterator&gt;,
	   typename = _RequireAllocator&lt;_Allocator&gt;&gt;
    list(_InputIterator, _InputIterator, _Allocator = _Allocator())
      -&gt; list&lt;_ValT, _Allocator&gt;;
#endif

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator==(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() == __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator!=(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() != __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&lt;(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	      const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &lt; __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&lt;=(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &lt;= __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&gt;=(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &gt;= __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&gt;(const list&lt;_Tp, _Alloc&gt;&amp; __lhs,
	      const list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &gt; __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline void
    swap(list&lt;_Tp, _Alloc&gt;&amp; __lhs, list&lt;_Tp, _Alloc&gt;&amp; __rhs)
    _GLIBCXX_NOEXCEPT_IF(noexcept(__lhs.swap(__rhs)))
    { __lhs.swap(__rhs); }

} // namespace __debug
} // namespace std

namespace __gnu_debug
{
#ifndef _GLIBCXX_USE_CXX11_ABI
  // If not using C++11 list::size() is not in O(1) so we do not use it.
  template&lt;typename _Tp, typename _Alloc&gt;
    struct _Sequence_traits&lt;std::__debug::list&lt;_Tp, _Alloc&gt; &gt;
    {
      typedef typename std::__debug::list&lt;_Tp, _Alloc&gt;::iterator _It;

      static typename _Distance_traits&lt;_It&gt;::__type
      _S_size(const std::__debug::list&lt;_Tp, _Alloc&gt;&amp; __seq)
      {
	return __seq.empty()
	  ? std::make_pair(0, __dp_exact) : std::make_pair(1, __dp_equality);
      }
    };
#endif

#ifndef _GLIBCXX_DEBUG_PEDANTIC
  template&lt;class _Tp, class _Alloc&gt;
    struct _Insert_range_from_self_is_safe&lt;std::__debug::list&lt;_Tp, _Alloc&gt; &gt;
    { enum { __value = 1 }; };
#endif
}

#endif
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