--- /dev/null
+// List implementation -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+// 2011, 2012 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/>.
+
+/*
+ *
+ * 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) 1996,1997
+ * 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 bits/stl_list.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{list}
+ */
+
+#ifndef _STL_LIST_H
+#define _STL_LIST_H 1
+
+#include <bits/concept_check.h>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <initializer_list>
+#endif
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+ namespace __detail
+ {
+ _GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ // Supporting structures are split into common and templated
+ // types; the latter publicly inherits from the former in an
+ // effort to reduce code duplication. This results in some
+ // "needless" static_cast'ing later on, but it's all safe
+ // downcasting.
+
+ /// Common part of a node in the %list.
+ struct _List_node_base
+ {
+ _List_node_base* _M_next;
+ _List_node_base* _M_prev;
+
+ static void
+ swap(_List_node_base& __x, _List_node_base& __y) _GLIBCXX_USE_NOEXCEPT;
+
+ void
+ _M_transfer(_List_node_base* const __first,
+ _List_node_base* const __last) _GLIBCXX_USE_NOEXCEPT;
+
+ void
+ _M_reverse() _GLIBCXX_USE_NOEXCEPT;
+
+ void
+ _M_hook(_List_node_base* const __position) _GLIBCXX_USE_NOEXCEPT;
+
+ void
+ _M_unhook() _GLIBCXX_USE_NOEXCEPT;
+ };
+
+ _GLIBCXX_END_NAMESPACE_VERSION
+ } // namespace detail
+
+_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
+
+ /// An actual node in the %list.
+ template<typename _Tp>
+ struct _List_node : public __detail::_List_node_base
+ {
+ ///< User's data.
+ _Tp _M_data;
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename... _Args>
+ _List_node(_Args&&... __args)
+ : __detail::_List_node_base(), _M_data(std::forward<_Args>(__args)...)
+ { }
+#endif
+ };
+
+ /**
+ * @brief A list::iterator.
+ *
+ * All the functions are op overloads.
+ */
+ template<typename _Tp>
+ struct _List_iterator
+ {
+ typedef _List_iterator<_Tp> _Self;
+ typedef _List_node<_Tp> _Node;
+
+ typedef ptrdiff_t difference_type;
+ typedef std::bidirectional_iterator_tag iterator_category;
+ typedef _Tp value_type;
+ typedef _Tp* pointer;
+ typedef _Tp& reference;
+
+ _List_iterator()
+ : _M_node() { }
+
+ explicit
+ _List_iterator(__detail::_List_node_base* __x)
+ : _M_node(__x) { }
+
+ // Must downcast from _List_node_base to _List_node to get to _M_data.
+ reference
+ operator*() const
+ { return static_cast<_Node*>(_M_node)->_M_data; }
+
+ pointer
+ operator->() const
+ { return std::__addressof(static_cast<_Node*>(_M_node)->_M_data); }
+
+ _Self&
+ operator++()
+ {
+ _M_node = _M_node->_M_next;
+ return *this;
+ }
+
+ _Self
+ operator++(int)
+ {
+ _Self __tmp = *this;
+ _M_node = _M_node->_M_next;
+ return __tmp;
+ }
+
+ _Self&
+ operator--()
+ {
+ _M_node = _M_node->_M_prev;
+ return *this;
+ }
+
+ _Self
+ operator--(int)
+ {
+ _Self __tmp = *this;
+ _M_node = _M_node->_M_prev;
+ return __tmp;
+ }
+
+ bool
+ operator==(const _Self& __x) const
+ { return _M_node == __x._M_node; }
+
+ bool
+ operator!=(const _Self& __x) const
+ { return _M_node != __x._M_node; }
+
+ // The only member points to the %list element.
+ __detail::_List_node_base* _M_node;
+ };
+
+ /**
+ * @brief A list::const_iterator.
+ *
+ * All the functions are op overloads.
+ */
+ template<typename _Tp>
+ struct _List_const_iterator
+ {
+ typedef _List_const_iterator<_Tp> _Self;
+ typedef const _List_node<_Tp> _Node;
+ typedef _List_iterator<_Tp> iterator;
+
+ typedef ptrdiff_t difference_type;
+ typedef std::bidirectional_iterator_tag iterator_category;
+ typedef _Tp value_type;
+ typedef const _Tp* pointer;
+ typedef const _Tp& reference;
+
+ _List_const_iterator()
+ : _M_node() { }
+
+ explicit
+ _List_const_iterator(const __detail::_List_node_base* __x)
+ : _M_node(__x) { }
+
+ _List_const_iterator(const iterator& __x)
+ : _M_node(__x._M_node) { }
+
+ // Must downcast from List_node_base to _List_node to get to
+ // _M_data.
+ reference
+ operator*() const
+ { return static_cast<_Node*>(_M_node)->_M_data; }
+
+ pointer
+ operator->() const
+ { return std::__addressof(static_cast<_Node*>(_M_node)->_M_data); }
+
+ _Self&
+ operator++()
+ {
+ _M_node = _M_node->_M_next;
+ return *this;
+ }
+
+ _Self
+ operator++(int)
+ {
+ _Self __tmp = *this;
+ _M_node = _M_node->_M_next;
+ return __tmp;
+ }
+
+ _Self&
+ operator--()
+ {
+ _M_node = _M_node->_M_prev;
+ return *this;
+ }
+
+ _Self
+ operator--(int)
+ {
+ _Self __tmp = *this;
+ _M_node = _M_node->_M_prev;
+ return __tmp;
+ }
+
+ bool
+ operator==(const _Self& __x) const
+ { return _M_node == __x._M_node; }
+
+ bool
+ operator!=(const _Self& __x) const
+ { return _M_node != __x._M_node; }
+
+ // The only member points to the %list element.
+ const __detail::_List_node_base* _M_node;
+ };
+
+ template<typename _Val>
+ inline bool
+ operator==(const _List_iterator<_Val>& __x,
+ const _List_const_iterator<_Val>& __y)
+ { return __x._M_node == __y._M_node; }
+
+ template<typename _Val>
+ inline bool
+ operator!=(const _List_iterator<_Val>& __x,
+ const _List_const_iterator<_Val>& __y)
+ { return __x._M_node != __y._M_node; }
+
+
+ /// See bits/stl_deque.h's _Deque_base for an explanation.
+ template<typename _Tp, typename _Alloc>
+ class _List_base
+ {
+ protected:
+ // NOTA BENE
+ // The stored instance is not actually of "allocator_type"'s
+ // type. Instead we rebind the type to
+ // Allocator<List_node<Tp>>, which according to [20.1.5]/4
+ // should probably be the same. List_node<Tp> is not the same
+ // size as Tp (it's two pointers larger), and specializations on
+ // Tp may go unused because List_node<Tp> is being bound
+ // instead.
+ //
+ // We put this to the test in the constructors and in
+ // get_allocator, where we use conversions between
+ // allocator_type and _Node_alloc_type. The conversion is
+ // required by table 32 in [20.1.5].
+ typedef typename _Alloc::template rebind<_List_node<_Tp> >::other
+ _Node_alloc_type;
+
+ typedef typename _Alloc::template rebind<_Tp>::other _Tp_alloc_type;
+
+ struct _List_impl
+ : public _Node_alloc_type
+ {
+ __detail::_List_node_base _M_node;
+
+ _List_impl()
+ : _Node_alloc_type(), _M_node()
+ { }
+
+ _List_impl(const _Node_alloc_type& __a)
+ : _Node_alloc_type(__a), _M_node()
+ { }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ _List_impl(_Node_alloc_type&& __a)
+ : _Node_alloc_type(std::move(__a)), _M_node()
+ { }
+#endif
+ };
+
+ _List_impl _M_impl;
+
+ _List_node<_Tp>*
+ _M_get_node()
+ { return _M_impl._Node_alloc_type::allocate(1); }
+
+ void
+ _M_put_node(_List_node<_Tp>* __p)
+ { _M_impl._Node_alloc_type::deallocate(__p, 1); }
+
+ public:
+ typedef _Alloc allocator_type;
+
+ _Node_alloc_type&
+ _M_get_Node_allocator() _GLIBCXX_NOEXCEPT
+ { return *static_cast<_Node_alloc_type*>(&_M_impl); }
+
+ const _Node_alloc_type&
+ _M_get_Node_allocator() const _GLIBCXX_NOEXCEPT
+ { return *static_cast<const _Node_alloc_type*>(&_M_impl); }
+
+ _Tp_alloc_type
+ _M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT
+ { return _Tp_alloc_type(_M_get_Node_allocator()); }
+
+ allocator_type
+ get_allocator() const _GLIBCXX_NOEXCEPT
+ { return allocator_type(_M_get_Node_allocator()); }
+
+ _List_base()
+ : _M_impl()
+ { _M_init(); }
+
+ _List_base(const _Node_alloc_type& __a)
+ : _M_impl(__a)
+ { _M_init(); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ _List_base(_List_base&& __x)
+ : _M_impl(std::move(__x._M_get_Node_allocator()))
+ {
+ _M_init();
+ __detail::_List_node_base::swap(_M_impl._M_node, __x._M_impl._M_node);
+ }
+#endif
+
+ // This is what actually destroys the list.
+ ~_List_base() _GLIBCXX_NOEXCEPT
+ { _M_clear(); }
+
+ void
+ _M_clear();
+
+ void
+ _M_init()
+ {
+ this->_M_impl._M_node._M_next = &this->_M_impl._M_node;
+ this->_M_impl._M_node._M_prev = &this->_M_impl._M_node;
+ }
+ };
+
+ /**
+ * @brief A standard container with linear time access to elements,
+ * and fixed time insertion/deletion at any point in the sequence.
+ *
+ * @ingroup sequences
+ *
+ * Meets the requirements of a <a href="tables.html#65">container</a>, a
+ * <a href="tables.html#66">reversible container</a>, and a
+ * <a href="tables.html#67">sequence</a>, including the
+ * <a href="tables.html#68">optional sequence requirements</a> with the
+ * %exception of @c at and @c operator[].
+ *
+ * This is a @e doubly @e linked %list. Traversal up and down the
+ * %list requires linear time, but adding and removing elements (or
+ * @e nodes) is done in constant time, regardless of where the
+ * change takes place. Unlike std::vector and std::deque,
+ * random-access iterators are not provided, so subscripting ( @c
+ * [] ) access is not allowed. For algorithms which only need
+ * sequential access, this lack makes no difference.
+ *
+ * Also unlike the other standard containers, std::list provides
+ * specialized algorithms %unique to linked lists, such as
+ * splicing, sorting, and in-place reversal.
+ *
+ * A couple points on memory allocation for list<Tp>:
+ *
+ * First, we never actually allocate a Tp, we allocate
+ * List_node<Tp>'s and trust [20.1.5]/4 to DTRT. This is to ensure
+ * that after elements from %list<X,Alloc1> are spliced into
+ * %list<X,Alloc2>, destroying the memory of the second %list is a
+ * valid operation, i.e., Alloc1 giveth and Alloc2 taketh away.
+ *
+ * Second, a %list conceptually represented as
+ * @code
+ * A <---> B <---> C <---> D
+ * @endcode
+ * is actually circular; a link exists between A and D. The %list
+ * class holds (as its only data member) a private list::iterator
+ * pointing to @e D, not to @e A! To get to the head of the %list,
+ * we start at the tail and move forward by one. When this member
+ * iterator's next/previous pointers refer to itself, the %list is
+ * %empty.
+ */
+ template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
+ class list : protected _List_base<_Tp, _Alloc>
+ {
+ // concept requirements
+ typedef typename _Alloc::value_type _Alloc_value_type;
+ __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
+ __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
+
+ typedef _List_base<_Tp, _Alloc> _Base;
+ typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
+ typedef typename _Base::_Node_alloc_type _Node_alloc_type;
+
+ public:
+ typedef _Tp value_type;
+ typedef typename _Tp_alloc_type::pointer pointer;
+ typedef typename _Tp_alloc_type::const_pointer const_pointer;
+ typedef typename _Tp_alloc_type::reference reference;
+ typedef typename _Tp_alloc_type::const_reference const_reference;
+ typedef _List_iterator<_Tp> iterator;
+ typedef _List_const_iterator<_Tp> const_iterator;
+ typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
+ typedef std::reverse_iterator<iterator> reverse_iterator;
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Alloc allocator_type;
+
+ protected:
+ // Note that pointers-to-_Node's can be ctor-converted to
+ // iterator types.
+ typedef _List_node<_Tp> _Node;
+
+ using _Base::_M_impl;
+ using _Base::_M_put_node;
+ using _Base::_M_get_node;
+ using _Base::_M_get_Tp_allocator;
+ using _Base::_M_get_Node_allocator;
+
+ /**
+ * @param __args An instance of user data.
+ *
+ * Allocates space for a new node and constructs a copy of
+ * @a __args in it.
+ */
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+ _Node*
+ _M_create_node(const value_type& __x)
+ {
+ _Node* __p = this->_M_get_node();
+ __try
+ {
+ _M_get_Tp_allocator().construct
+ (std::__addressof(__p->_M_data), __x);
+ }
+ __catch(...)
+ {
+ _M_put_node(__p);
+ __throw_exception_again;
+ }
+ return __p;
+ }
+#else
+ template<typename... _Args>
+ _Node*
+ _M_create_node(_Args&&... __args)
+ {
+ _Node* __p = this->_M_get_node();
+ __try
+ {
+ _M_get_Node_allocator().construct(__p,
+ std::forward<_Args>(__args)...);
+ }
+ __catch(...)
+ {
+ _M_put_node(__p);
+ __throw_exception_again;
+ }
+ return __p;
+ }
+#endif
+
+ public:
+ // [23.2.2.1] construct/copy/destroy
+ // (assign() and get_allocator() are also listed in this section)
+ /**
+ * @brief Default constructor creates no elements.
+ */
+ list()
+ : _Base() { }
+
+ /**
+ * @brief Creates a %list with no elements.
+ * @param __a An allocator object.
+ */
+ explicit
+ list(const allocator_type& __a)
+ : _Base(_Node_alloc_type(__a)) { }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Creates a %list with default constructed elements.
+ * @param __n The number of elements to initially create.
+ *
+ * This constructor fills the %list with @a __n default
+ * constructed elements.
+ */
+ explicit
+ list(size_type __n)
+ : _Base()
+ { _M_default_initialize(__n); }
+
+ /**
+ * @brief Creates a %list with copies of an exemplar element.
+ * @param __n The number of elements to initially create.
+ * @param __value An element to copy.
+ * @param __a An allocator object.
+ *
+ * This constructor fills the %list with @a __n copies of @a __value.
+ */
+ list(size_type __n, const value_type& __value,
+ const allocator_type& __a = allocator_type())
+ : _Base(_Node_alloc_type(__a))
+ { _M_fill_initialize(__n, __value); }
+#else
+ /**
+ * @brief Creates a %list with copies of an exemplar element.
+ * @param __n The number of elements to initially create.
+ * @param __value An element to copy.
+ * @param __a An allocator object.
+ *
+ * This constructor fills the %list with @a __n copies of @a __value.
+ */
+ explicit
+ list(size_type __n, const value_type& __value = value_type(),
+ const allocator_type& __a = allocator_type())
+ : _Base(_Node_alloc_type(__a))
+ { _M_fill_initialize(__n, __value); }
+#endif
+
+ /**
+ * @brief %List copy constructor.
+ * @param __x A %list of identical element and allocator types.
+ *
+ * The newly-created %list uses a copy of the allocation object used
+ * by @a __x.
+ */
+ list(const list& __x)
+ : _Base(__x._M_get_Node_allocator())
+ { _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief %List move constructor.
+ * @param __x A %list of identical element and allocator types.
+ *
+ * The newly-created %list contains the exact contents of @a __x.
+ * The contents of @a __x are a valid, but unspecified %list.
+ */
+ list(list&& __x) noexcept
+ : _Base(std::move(__x)) { }
+
+ /**
+ * @brief Builds a %list from an initializer_list
+ * @param __l An initializer_list of value_type.
+ * @param __a An allocator object.
+ *
+ * Create a %list consisting of copies of the elements in the
+ * initializer_list @a __l. This is linear in __l.size().
+ */
+ list(initializer_list<value_type> __l,
+ const allocator_type& __a = allocator_type())
+ : _Base(_Node_alloc_type(__a))
+ { _M_initialize_dispatch(__l.begin(), __l.end(), __false_type()); }
+#endif
+
+ /**
+ * @brief Builds a %list from a range.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
+ * @param __a An allocator object.
+ *
+ * Create a %list consisting of copies of the elements from
+ * [@a __first,@a __last). This is linear in N (where N is
+ * distance(@a __first,@a __last)).
+ */
+ template<typename _InputIterator>
+ list(_InputIterator __first, _InputIterator __last,
+ const allocator_type& __a = allocator_type())
+ : _Base(_Node_alloc_type(__a))
+ {
+ // Check whether it's an integral type. If so, it's not an iterator.
+ typedef typename std::__is_integer<_InputIterator>::__type _Integral;
+ _M_initialize_dispatch(__first, __last, _Integral());
+ }
+
+ /**
+ * No explicit dtor needed as the _Base dtor takes care of
+ * things. The _Base dtor only erases the elements, and note
+ * that if the elements themselves are pointers, the pointed-to
+ * memory is not touched in any way. Managing the pointer is
+ * the user's responsibility.
+ */
+
+ /**
+ * @brief %List assignment operator.
+ * @param __x A %list of identical element and allocator types.
+ *
+ * All the elements of @a __x are copied, but unlike the copy
+ * constructor, the allocator object is not copied.
+ */
+ list&
+ operator=(const list& __x);
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief %List move assignment operator.
+ * @param __x A %list of identical element and allocator types.
+ *
+ * The contents of @a __x are moved into this %list (without copying).
+ * @a __x is a valid, but unspecified %list
+ */
+ list&
+ operator=(list&& __x)
+ {
+ // NB: DR 1204.
+ // NB: DR 675.
+ this->clear();
+ this->swap(__x);
+ return *this;
+ }
+
+ /**
+ * @brief %List initializer list assignment operator.
+ * @param __l An initializer_list of value_type.
+ *
+ * Replace the contents of the %list with copies of the elements
+ * in the initializer_list @a __l. This is linear in l.size().
+ */
+ list&
+ operator=(initializer_list<value_type> __l)
+ {
+ this->assign(__l.begin(), __l.end());
+ return *this;
+ }
+#endif
+
+ /**
+ * @brief Assigns a given value to a %list.
+ * @param __n Number of elements to be assigned.
+ * @param __val Value to be assigned.
+ *
+ * This function fills a %list with @a __n copies of the given
+ * value. Note that the assignment completely changes the %list
+ * and that the resulting %list's size is the same as the number
+ * of elements assigned. Old data may be lost.
+ */
+ void
+ assign(size_type __n, const value_type& __val)
+ { _M_fill_assign(__n, __val); }
+
+ /**
+ * @brief Assigns a range to a %list.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
+ *
+ * This function fills a %list with copies of the elements in the
+ * range [@a __first,@a __last).
+ *
+ * Note that the assignment completely changes the %list and
+ * that the resulting %list's size is the same as the number of
+ * elements assigned. Old data may be lost.
+ */
+ template<typename _InputIterator>
+ void
+ assign(_InputIterator __first, _InputIterator __last)
+ {
+ // Check whether it's an integral type. If so, it's not an iterator.
+ typedef typename std::__is_integer<_InputIterator>::__type _Integral;
+ _M_assign_dispatch(__first, __last, _Integral());
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Assigns an initializer_list to a %list.
+ * @param __l An initializer_list of value_type.
+ *
+ * Replace the contents of the %list with copies of the elements
+ * in the initializer_list @a __l. This is linear in __l.size().
+ */
+ void
+ assign(initializer_list<value_type> __l)
+ { this->assign(__l.begin(), __l.end()); }
+#endif
+
+ /// Get a copy of the memory allocation object.
+ allocator_type
+ get_allocator() const _GLIBCXX_NOEXCEPT
+ { return _Base::get_allocator(); }
+
+ // iterators
+ /**
+ * Returns a read/write iterator that points to the first element in the
+ * %list. Iteration is done in ordinary element order.
+ */
+ iterator
+ begin() _GLIBCXX_NOEXCEPT
+ { return iterator(this->_M_impl._M_node._M_next); }
+
+ /**
+ * Returns a read-only (constant) iterator that points to the
+ * first element in the %list. Iteration is done in ordinary
+ * element order.
+ */
+ const_iterator
+ begin() const _GLIBCXX_NOEXCEPT
+ { return const_iterator(this->_M_impl._M_node._M_next); }
+
+ /**
+ * Returns a read/write iterator that points one past the last
+ * element in the %list. Iteration is done in ordinary element
+ * order.
+ */
+ iterator
+ end() _GLIBCXX_NOEXCEPT
+ { return iterator(&this->_M_impl._M_node); }
+
+ /**
+ * Returns a read-only (constant) iterator that points one past
+ * the last element in the %list. Iteration is done in ordinary
+ * element order.
+ */
+ const_iterator
+ end() const _GLIBCXX_NOEXCEPT
+ { return const_iterator(&this->_M_impl._M_node); }
+
+ /**
+ * Returns a read/write reverse iterator that points to the last
+ * element in the %list. Iteration is done in reverse element
+ * order.
+ */
+ reverse_iterator
+ rbegin() _GLIBCXX_NOEXCEPT
+ { return reverse_iterator(end()); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to
+ * the last element in the %list. Iteration is done in reverse
+ * element order.
+ */
+ const_reverse_iterator
+ rbegin() const _GLIBCXX_NOEXCEPT
+ { return const_reverse_iterator(end()); }
+
+ /**
+ * Returns a read/write reverse iterator that points to one
+ * before the first element in the %list. Iteration is done in
+ * reverse element order.
+ */
+ reverse_iterator
+ rend() _GLIBCXX_NOEXCEPT
+ { return reverse_iterator(begin()); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to one
+ * before the first element in the %list. Iteration is done in reverse
+ * element order.
+ */
+ const_reverse_iterator
+ rend() const _GLIBCXX_NOEXCEPT
+ { return const_reverse_iterator(begin()); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * Returns a read-only (constant) iterator that points to the
+ * first element in the %list. Iteration is done in ordinary
+ * element order.
+ */
+ const_iterator
+ cbegin() const noexcept
+ { return const_iterator(this->_M_impl._M_node._M_next); }
+
+ /**
+ * Returns a read-only (constant) iterator that points one past
+ * the last element in the %list. Iteration is done in ordinary
+ * element order.
+ */
+ const_iterator
+ cend() const noexcept
+ { return const_iterator(&this->_M_impl._M_node); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to
+ * the last element in the %list. Iteration is done in reverse
+ * element order.
+ */
+ const_reverse_iterator
+ crbegin() const noexcept
+ { return const_reverse_iterator(end()); }
+
+ /**
+ * Returns a read-only (constant) reverse iterator that points to one
+ * before the first element in the %list. Iteration is done in reverse
+ * element order.
+ */
+ const_reverse_iterator
+ crend() const noexcept
+ { return const_reverse_iterator(begin()); }
+#endif
+
+ // [23.2.2.2] capacity
+ /**
+ * Returns true if the %list is empty. (Thus begin() would equal
+ * end().)
+ */
+ bool
+ empty() const _GLIBCXX_NOEXCEPT
+ { return this->_M_impl._M_node._M_next == &this->_M_impl._M_node; }
+
+ /** Returns the number of elements in the %list. */
+ size_type
+ size() const _GLIBCXX_NOEXCEPT
+ { return std::distance(begin(), end()); }
+
+ /** Returns the size() of the largest possible %list. */
+ size_type
+ max_size() const _GLIBCXX_NOEXCEPT
+ { return _M_get_Node_allocator().max_size(); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Resizes the %list to the specified number of elements.
+ * @param __new_size Number of elements the %list should contain.
+ *
+ * This function will %resize the %list to the specified number
+ * of elements. If the number is smaller than the %list's
+ * current size the %list is truncated, otherwise default
+ * constructed elements are appended.
+ */
+ void
+ resize(size_type __new_size);
+
+ /**
+ * @brief Resizes the %list to the specified number of elements.
+ * @param __new_size Number of elements the %list should contain.
+ * @param __x Data with which new elements should be populated.
+ *
+ * This function will %resize the %list to the specified number
+ * of elements. If the number is smaller than the %list's
+ * current size the %list is truncated, otherwise the %list is
+ * extended and new elements are populated with given data.
+ */
+ void
+ resize(size_type __new_size, const value_type& __x);
+#else
+ /**
+ * @brief Resizes the %list to the specified number of elements.
+ * @param __new_size Number of elements the %list should contain.
+ * @param __x Data with which new elements should be populated.
+ *
+ * This function will %resize the %list to the specified number
+ * of elements. If the number is smaller than the %list's
+ * current size the %list is truncated, otherwise the %list is
+ * extended and new elements are populated with given data.
+ */
+ void
+ resize(size_type __new_size, value_type __x = value_type());
+#endif
+
+ // element access
+ /**
+ * Returns a read/write reference to the data at the first
+ * element of the %list.
+ */
+ reference
+ front()
+ { return *begin(); }
+
+ /**
+ * Returns a read-only (constant) reference to the data at the first
+ * element of the %list.
+ */
+ const_reference
+ front() const
+ { return *begin(); }
+
+ /**
+ * Returns a read/write reference to the data at the last element
+ * of the %list.
+ */
+ reference
+ back()
+ {
+ iterator __tmp = end();
+ --__tmp;
+ return *__tmp;
+ }
+
+ /**
+ * Returns a read-only (constant) reference to the data at the last
+ * element of the %list.
+ */
+ const_reference
+ back() const
+ {
+ const_iterator __tmp = end();
+ --__tmp;
+ return *__tmp;
+ }
+
+ // [23.2.2.3] modifiers
+ /**
+ * @brief Add data to the front of the %list.
+ * @param __x Data to be added.
+ *
+ * This is a typical stack operation. The function creates an
+ * element at the front of the %list and assigns the given data
+ * to it. Due to the nature of a %list this operation can be
+ * done in constant time, and does not invalidate iterators and
+ * references.
+ */
+ void
+ push_front(const value_type& __x)
+ { this->_M_insert(begin(), __x); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ push_front(value_type&& __x)
+ { this->_M_insert(begin(), std::move(__x)); }
+
+ template<typename... _Args>
+ void
+ emplace_front(_Args&&... __args)
+ { this->_M_insert(begin(), std::forward<_Args>(__args)...); }
+#endif
+
+ /**
+ * @brief Removes first element.
+ *
+ * This is a typical stack operation. It shrinks the %list by
+ * one. Due to the nature of a %list this operation can be done
+ * in constant time, and only invalidates iterators/references to
+ * the element being removed.
+ *
+ * Note that no data is returned, and if the first element's data
+ * is needed, it should be retrieved before pop_front() is
+ * called.
+ */
+ void
+ pop_front()
+ { this->_M_erase(begin()); }
+
+ /**
+ * @brief Add data to the end of the %list.
+ * @param __x Data to be added.
+ *
+ * This is a typical stack operation. The function creates an
+ * element at the end of the %list and assigns the given data to
+ * it. Due to the nature of a %list this operation can be done
+ * in constant time, and does not invalidate iterators and
+ * references.
+ */
+ void
+ push_back(const value_type& __x)
+ { this->_M_insert(end(), __x); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ push_back(value_type&& __x)
+ { this->_M_insert(end(), std::move(__x)); }
+
+ template<typename... _Args>
+ void
+ emplace_back(_Args&&... __args)
+ { this->_M_insert(end(), std::forward<_Args>(__args)...); }
+#endif
+
+ /**
+ * @brief Removes last element.
+ *
+ * This is a typical stack operation. It shrinks the %list by
+ * one. Due to the nature of a %list this operation can be done
+ * in constant time, and only invalidates iterators/references to
+ * the element being removed.
+ *
+ * Note that no data is returned, and if the last element's data
+ * is needed, it should be retrieved before pop_back() is called.
+ */
+ void
+ pop_back()
+ { this->_M_erase(iterator(this->_M_impl._M_node._M_prev)); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Constructs object in %list before specified iterator.
+ * @param __position A const_iterator into the %list.
+ * @param __args Arguments.
+ * @return An iterator that points to the inserted data.
+ *
+ * This function will insert an object of type T constructed
+ * with T(std::forward<Args>(args)...) before the specified
+ * location. Due to the nature of a %list this operation can
+ * be done in constant time, and does not invalidate iterators
+ * and references.
+ */
+ template<typename... _Args>
+ iterator
+ emplace(iterator __position, _Args&&... __args);
+#endif
+
+ /**
+ * @brief Inserts given value into %list before specified iterator.
+ * @param __position An iterator into the %list.
+ * @param __x Data to be inserted.
+ * @return An iterator that points to the inserted data.
+ *
+ * This function will insert a copy of the given value before
+ * the specified location. Due to the nature of a %list this
+ * operation can be done in constant time, and does not
+ * invalidate iterators and references.
+ */
+ iterator
+ insert(iterator __position, const value_type& __x);
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ /**
+ * @brief Inserts given rvalue into %list before specified iterator.
+ * @param __position An iterator into the %list.
+ * @param __x Data to be inserted.
+ * @return An iterator that points to the inserted data.
+ *
+ * This function will insert a copy of the given rvalue before
+ * the specified location. Due to the nature of a %list this
+ * operation can be done in constant time, and does not
+ * invalidate iterators and references.
+ */
+ iterator
+ insert(iterator __position, value_type&& __x)
+ { return emplace(__position, std::move(__x)); }
+
+ /**
+ * @brief Inserts the contents of an initializer_list into %list
+ * before specified iterator.
+ * @param __p An iterator into the %list.
+ * @param __l An initializer_list of value_type.
+ *
+ * This function will insert copies of the data in the
+ * initializer_list @a l into the %list before the location
+ * specified by @a p.
+ *
+ * This operation is linear in the number of elements inserted and
+ * does not invalidate iterators and references.
+ */
+ void
+ insert(iterator __p, initializer_list<value_type> __l)
+ { this->insert(__p, __l.begin(), __l.end()); }
+#endif
+
+ /**
+ * @brief Inserts a number of copies of given data into the %list.
+ * @param __position An iterator into the %list.
+ * @param __n Number of elements to be inserted.
+ * @param __x Data to be inserted.
+ *
+ * This function will insert a specified number of copies of the
+ * given data before the location specified by @a position.
+ *
+ * This operation is linear in the number of elements inserted and
+ * does not invalidate iterators and references.
+ */
+ void
+ insert(iterator __position, size_type __n, const value_type& __x)
+ {
+ list __tmp(__n, __x, get_allocator());
+ splice(__position, __tmp);
+ }
+
+ /**
+ * @brief Inserts a range into the %list.
+ * @param __position An iterator into the %list.
+ * @param __first An input iterator.
+ * @param __last An input iterator.
+ *
+ * This function will insert copies of the data in the range [@a
+ * first,@a last) into the %list before the location specified by
+ * @a position.
+ *
+ * This operation is linear in the number of elements inserted and
+ * does not invalidate iterators and references.
+ */
+ template<typename _InputIterator>
+ void
+ insert(iterator __position, _InputIterator __first,
+ _InputIterator __last)
+ {
+ list __tmp(__first, __last, get_allocator());
+ splice(__position, __tmp);
+ }
+
+ /**
+ * @brief Remove element at given position.
+ * @param __position Iterator pointing to element to be erased.
+ * @return An iterator pointing to the next element (or end()).
+ *
+ * This function will erase the element at the given position and thus
+ * shorten the %list by one.
+ *
+ * Due to the nature of a %list this operation can be done in
+ * constant time, and only invalidates iterators/references to
+ * the element being removed. The user is also cautioned that
+ * this function only erases the element, and that if the element
+ * is itself a pointer, the pointed-to memory is not touched in
+ * any way. Managing the pointer is the user's responsibility.
+ */
+ iterator
+ erase(iterator __position);
+
+ /**
+ * @brief Remove a range of elements.
+ * @param __first Iterator pointing to the first element to be erased.
+ * @param __last Iterator pointing to one past the last element to be
+ * erased.
+ * @return An iterator pointing to the element pointed to by @a last
+ * prior to erasing (or end()).
+ *
+ * This function will erase the elements in the range @a
+ * [first,last) and shorten the %list accordingly.
+ *
+ * This operation is linear time in the size of the range and only
+ * invalidates iterators/references to the element being removed.
+ * The user is also cautioned that this function only erases the
+ * elements, and that if the elements themselves are pointers, the
+ * pointed-to memory is not touched in any way. Managing the pointer
+ * is the user's responsibility.
+ */
+ iterator
+ erase(iterator __first, iterator __last)
+ {
+ while (__first != __last)
+ __first = erase(__first);
+ return __last;
+ }
+
+ /**
+ * @brief Swaps data with another %list.
+ * @param __x A %list of the same element and allocator types.
+ *
+ * This exchanges the elements between two lists in constant
+ * time. Note that the global std::swap() function is
+ * specialized such that std::swap(l1,l2) will feed to this
+ * function.
+ */
+ void
+ swap(list& __x)
+ {
+ __detail::_List_node_base::swap(this->_M_impl._M_node,
+ __x._M_impl._M_node);
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 431. Swapping containers with unequal allocators.
+ std::__alloc_swap<typename _Base::_Node_alloc_type>::
+ _S_do_it(_M_get_Node_allocator(), __x._M_get_Node_allocator());
+ }
+
+ /**
+ * Erases all the elements. Note that this function only erases
+ * the elements, and that if the elements themselves are
+ * pointers, the pointed-to memory is not touched in any way.
+ * Managing the pointer is the user's responsibility.
+ */
+ void
+ clear() _GLIBCXX_NOEXCEPT
+ {
+ _Base::_M_clear();
+ _Base::_M_init();
+ }
+
+ // [23.2.2.4] list operations
+ /**
+ * @brief Insert contents of another %list.
+ * @param __position Iterator referencing the element to insert before.
+ * @param __x Source list.
+ *
+ * The elements of @a __x are inserted in constant time in front of
+ * the element referenced by @a __position. @a __x becomes an empty
+ * list.
+ *
+ * Requires this != @a __x.
+ */
+ void
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ splice(iterator __position, list&& __x)
+#else
+ splice(iterator __position, list& __x)
+#endif
+ {
+ if (!__x.empty())
+ {
+ _M_check_equal_allocators(__x);
+
+ this->_M_transfer(__position, __x.begin(), __x.end());
+ }
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ splice(iterator __position, list& __x)
+ { splice(__position, std::move(__x)); }
+#endif
+
+ /**
+ * @brief Insert element from another %list.
+ * @param __position Iterator referencing the element to insert before.
+ * @param __x Source list.
+ * @param __i Iterator referencing the element to move.
+ *
+ * Removes the element in list @a __x referenced by @a __i and
+ * inserts it into the current list before @a __position.
+ */
+ void
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ splice(iterator __position, list&& __x, iterator __i)
+#else
+ splice(iterator __position, list& __x, iterator __i)
+#endif
+ {
+ iterator __j = __i;
+ ++__j;
+ if (__position == __i || __position == __j)
+ return;
+
+ if (this != &__x)
+ _M_check_equal_allocators(__x);
+
+ this->_M_transfer(__position, __i, __j);
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ splice(iterator __position, list& __x, iterator __i)
+ { splice(__position, std::move(__x), __i); }
+#endif
+
+ /**
+ * @brief Insert range from another %list.
+ * @param __position Iterator referencing the element to insert before.
+ * @param __x Source list.
+ * @param __first Iterator referencing the start of range in x.
+ * @param __last Iterator referencing the end of range in x.
+ *
+ * Removes elements in the range [__first,__last) and inserts them
+ * before @a __position in constant time.
+ *
+ * Undefined if @a __position is in [__first,__last).
+ */
+ void
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ splice(iterator __position, list&& __x, iterator __first,
+ iterator __last)
+#else
+ splice(iterator __position, list& __x, iterator __first,
+ iterator __last)
+#endif
+ {
+ if (__first != __last)
+ {
+ if (this != &__x)
+ _M_check_equal_allocators(__x);
+
+ this->_M_transfer(__position, __first, __last);
+ }
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ splice(iterator __position, list& __x, iterator __first, iterator __last)
+ { splice(__position, std::move(__x), __first, __last); }
+#endif
+
+ /**
+ * @brief Remove all elements equal to value.
+ * @param __value The value to remove.
+ *
+ * Removes every element in the list equal to @a value.
+ * Remaining elements stay in list order. Note that this
+ * function only erases the elements, and that if the elements
+ * themselves are pointers, the pointed-to memory is not
+ * touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ void
+ remove(const _Tp& __value);
+
+ /**
+ * @brief Remove all elements satisfying a predicate.
+ * @tparam _Predicate Unary predicate function or object.
+ *
+ * Removes every element in the list for which the predicate
+ * returns true. Remaining elements stay in list order. Note
+ * that this function only erases the elements, and that if the
+ * elements themselves are pointers, the pointed-to memory is
+ * not touched in any way. Managing the pointer is the user's
+ * responsibility.
+ */
+ template<typename _Predicate>
+ void
+ remove_if(_Predicate);
+
+ /**
+ * @brief Remove consecutive duplicate elements.
+ *
+ * For each consecutive set of elements with the same value,
+ * remove all but the first one. Remaining elements stay in
+ * list order. Note that this function only erases the
+ * elements, and that if the elements themselves are pointers,
+ * the pointed-to memory is not touched in any way. Managing
+ * the pointer is the user's responsibility.
+ */
+ void
+ unique();
+
+ /**
+ * @brief Remove consecutive elements satisfying a predicate.
+ * @tparam _BinaryPredicate Binary predicate function or object.
+ *
+ * For each consecutive set of elements [first,last) that
+ * satisfy predicate(first,i) where i is an iterator in
+ * [first,last), remove all but the first one. Remaining
+ * elements stay in list order. Note that this function only
+ * erases the elements, and that if the elements themselves are
+ * pointers, the pointed-to memory is not touched in any way.
+ * Managing the pointer is the user's responsibility.
+ */
+ template<typename _BinaryPredicate>
+ void
+ unique(_BinaryPredicate);
+
+ /**
+ * @brief Merge sorted lists.
+ * @param __x Sorted list to merge.
+ *
+ * Assumes that both @a __x and this list are sorted according to
+ * operator<(). Merges elements of @a __x into this list in
+ * sorted order, leaving @a __x empty when complete. Elements in
+ * this list precede elements in @a __x that are equal.
+ */
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ merge(list&& __x);
+
+ void
+ merge(list& __x)
+ { merge(std::move(__x)); }
+#else
+ void
+ merge(list& __x);
+#endif
+
+ /**
+ * @brief Merge sorted lists according to comparison function.
+ * @tparam _StrictWeakOrdering Comparison function defining
+ * sort order.
+ * @param __x Sorted list to merge.
+ * @param __comp Comparison functor.
+ *
+ * Assumes that both @a __x and this list are sorted according to
+ * StrictWeakOrdering. Merges elements of @a __x into this list
+ * in sorted order, leaving @a __x empty when complete. Elements
+ * in this list precede elements in @a __x that are equivalent
+ * according to StrictWeakOrdering().
+ */
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _StrictWeakOrdering>
+ void
+ merge(list&& __x, _StrictWeakOrdering __comp);
+
+ template<typename _StrictWeakOrdering>
+ void
+ merge(list& __x, _StrictWeakOrdering __comp)
+ { merge(std::move(__x), __comp); }
+#else
+ template<typename _StrictWeakOrdering>
+ void
+ merge(list& __x, _StrictWeakOrdering __comp);
+#endif
+
+ /**
+ * @brief Reverse the elements in list.
+ *
+ * Reverse the order of elements in the list in linear time.
+ */
+ void
+ reverse() _GLIBCXX_NOEXCEPT
+ { this->_M_impl._M_node._M_reverse(); }
+
+ /**
+ * @brief Sort the elements.
+ *
+ * Sorts the elements of this list in NlogN time. Equivalent
+ * elements remain in list order.
+ */
+ void
+ sort();
+
+ /**
+ * @brief Sort the elements according to comparison function.
+ *
+ * Sorts the elements of this list in NlogN time. Equivalent
+ * elements remain in list order.
+ */
+ template<typename _StrictWeakOrdering>
+ void
+ sort(_StrictWeakOrdering);
+
+ protected:
+ // Internal constructor functions follow.
+
+ // Called by the range constructor to implement [23.1.1]/9
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 438. Ambiguity in the "do the right thing" clause
+ template<typename _Integer>
+ void
+ _M_initialize_dispatch(_Integer __n, _Integer __x, __true_type)
+ { _M_fill_initialize(static_cast<size_type>(__n), __x); }
+
+ // Called by the range constructor to implement [23.1.1]/9
+ template<typename _InputIterator>
+ void
+ _M_initialize_dispatch(_InputIterator __first, _InputIterator __last,
+ __false_type)
+ {
+ for (; __first != __last; ++__first)
+ push_back(*__first);
+ }
+
+ // Called by list(n,v,a), and the range constructor when it turns out
+ // to be the same thing.
+ void
+ _M_fill_initialize(size_type __n, const value_type& __x)
+ {
+ for (; __n; --__n)
+ push_back(__x);
+ }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ // Called by list(n).
+ void
+ _M_default_initialize(size_type __n)
+ {
+ for (; __n; --__n)
+ emplace_back();
+ }
+
+ // Called by resize(sz).
+ void
+ _M_default_append(size_type __n);
+#endif
+
+ // Internal assign functions follow.
+
+ // Called by the range assign to implement [23.1.1]/9
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 438. Ambiguity in the "do the right thing" clause
+ template<typename _Integer>
+ void
+ _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
+ { _M_fill_assign(__n, __val); }
+
+ // Called by the range assign to implement [23.1.1]/9
+ template<typename _InputIterator>
+ void
+ _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
+ __false_type);
+
+ // Called by assign(n,t), and the range assign when it turns out
+ // to be the same thing.
+ void
+ _M_fill_assign(size_type __n, const value_type& __val);
+
+
+ // Moves the elements from [first,last) before position.
+ void
+ _M_transfer(iterator __position, iterator __first, iterator __last)
+ { __position._M_node->_M_transfer(__first._M_node, __last._M_node); }
+
+ // Inserts new element at position given and with value given.
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+ void
+ _M_insert(iterator __position, const value_type& __x)
+ {
+ _Node* __tmp = _M_create_node(__x);
+ __tmp->_M_hook(__position._M_node);
+ }
+#else
+ template<typename... _Args>
+ void
+ _M_insert(iterator __position, _Args&&... __args)
+ {
+ _Node* __tmp = _M_create_node(std::forward<_Args>(__args)...);
+ __tmp->_M_hook(__position._M_node);
+ }
+#endif
+
+ // Erases element at position given.
+ void
+ _M_erase(iterator __position)
+ {
+ __position._M_node->_M_unhook();
+ _Node* __n = static_cast<_Node*>(__position._M_node);
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ _M_get_Node_allocator().destroy(__n);
+#else
+ _M_get_Tp_allocator().destroy(std::__addressof(__n->_M_data));
+#endif
+ _M_put_node(__n);
+ }
+
+ // To implement the splice (and merge) bits of N1599.
+ void
+ _M_check_equal_allocators(list& __x)
+ {
+ if (std::__alloc_neq<typename _Base::_Node_alloc_type>::
+ _S_do_it(_M_get_Node_allocator(), __x._M_get_Node_allocator()))
+ __throw_runtime_error(__N("list::_M_check_equal_allocators"));
+ }
+ };
+
+ /**
+ * @brief List equality comparison.
+ * @param __x A %list.
+ * @param __y A %list of the same type as @a __x.
+ * @return True iff the size and elements of the lists are equal.
+ *
+ * This is an equivalence relation. It is linear in the size of
+ * the lists. Lists are considered equivalent if their sizes are
+ * equal, and if corresponding elements compare equal.
+ */
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ {
+ typedef typename list<_Tp, _Alloc>::const_iterator const_iterator;
+ const_iterator __end1 = __x.end();
+ const_iterator __end2 = __y.end();
+
+ const_iterator __i1 = __x.begin();
+ const_iterator __i2 = __y.begin();
+ while (__i1 != __end1 && __i2 != __end2 && *__i1 == *__i2)
+ {
+ ++__i1;
+ ++__i2;
+ }
+ return __i1 == __end1 && __i2 == __end2;
+ }
+
+ /**
+ * @brief List ordering relation.
+ * @param __x A %list.
+ * @param __y A %list of the same type as @a __x.
+ * @return True iff @a __x is lexicographically less than @a __y.
+ *
+ * This is a total ordering relation. It is linear in the size of the
+ * lists. The elements must be comparable with @c <.
+ *
+ * See std::lexicographical_compare() for how the determination is made.
+ */
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator<(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ { return std::lexicographical_compare(__x.begin(), __x.end(),
+ __y.begin(), __y.end()); }
+
+ /// Based on operator==
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator!=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ { return !(__x == __y); }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ { return __y < __x; }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator<=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ { return !(__y < __x); }
+
+ /// Based on operator<
+ template<typename _Tp, typename _Alloc>
+ inline bool
+ operator>=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
+ { return !(__x < __y); }
+
+ /// See std::list::swap().
+ template<typename _Tp, typename _Alloc>
+ inline void
+ swap(list<_Tp, _Alloc>& __x, list<_Tp, _Alloc>& __y)
+ { __x.swap(__y); }
+
+_GLIBCXX_END_NAMESPACE_CONTAINER
+} // namespace std
+
+#endif /* _STL_LIST_H */
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