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// List implementation -- C++ -- // Copyright (C) 2001-2018 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/>. /* * * 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> #include <ext/alloc_traits.h> #if __cplusplus >= 201103L #include <initializer_list> #include <bits/allocated_ptr.h> #include <ext/aligned_buffer.h> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION namespace __detail { // 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; }; /// The %list node header. struct _List_node_header : public _List_node_base { #if _GLIBCXX_USE_CXX11_ABI std::size_t _M_size; #endif _List_node_header() _GLIBCXX_NOEXCEPT { _M_init(); } #if __cplusplus >= 201103L _List_node_header(_List_node_header&& __x) noexcept : _List_node_base{ __x._M_next, __x._M_prev } # if _GLIBCXX_USE_CXX11_ABI , _M_size(__x._M_size) # endif { if (__x._M_base()->_M_next == __x._M_base()) this->_M_next = this->_M_prev = this; else { this->_M_next->_M_prev = this->_M_prev->_M_next = this->_M_base(); __x._M_init(); } } void _M_move_nodes(_List_node_header&& __x) { _List_node_base* const __xnode = __x._M_base(); if (__xnode->_M_next == __xnode) _M_init(); else { _List_node_base* const __node = this->_M_base(); __node->_M_next = __xnode->_M_next; __node->_M_prev = __xnode->_M_prev; __node->_M_next->_M_prev = __node->_M_prev->_M_next = __node; # if _GLIBCXX_USE_CXX11_ABI _M_size = __x._M_size; # endif __x._M_init(); } } #endif void _M_init() _GLIBCXX_NOEXCEPT { this->_M_next = this->_M_prev = this; #if _GLIBCXX_USE_CXX11_ABI this->_M_size = 0; #endif } private: _List_node_base* _M_base() { return this; } }; } // namespace detail _GLIBCXX_BEGIN_NAMESPACE_CONTAINER /// An actual node in the %list. template<typename _Tp> struct _List_node : public __detail::_List_node_base { #if __cplusplus >= 201103L __gnu_cxx::__aligned_membuf<_Tp> _M_storage; _Tp* _M_valptr() { return _M_storage._M_ptr(); } _Tp const* _M_valptr() const { return _M_storage._M_ptr(); } #else _Tp _M_data; _Tp* _M_valptr() { return std::__addressof(_M_data); } _Tp const* _M_valptr() const { return std::__addressof(_M_data); } #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() _GLIBCXX_NOEXCEPT : _M_node() { } explicit _List_iterator(__detail::_List_node_base* __x) _GLIBCXX_NOEXCEPT : _M_node(__x) { } _Self _M_const_cast() const _GLIBCXX_NOEXCEPT { return this; } // Must downcast from _List_node_base to _List_node to get to value. reference operator() const _GLIBCXX_NOEXCEPT { return static_cast<_Node>(_M_node)->_M_valptr(); } pointer operator->() const _GLIBCXX_NOEXCEPT { return static_cast<_Node>(_M_node)->_M_valptr(); } _Self& operator++() _GLIBCXX_NOEXCEPT { _M_node = _M_node->_M_next; return this; } _Self operator++(int) _GLIBCXX_NOEXCEPT { _Self __tmp = this; _M_node = _M_node->_M_next; return __tmp; } _Self& operator--() _GLIBCXX_NOEXCEPT { _M_node = _M_node->_M_prev; return this; } _Self operator--(int) _GLIBCXX_NOEXCEPT { _Self __tmp = this; _M_node = _M_node->_M_prev; return __tmp; } bool operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT { return _M_node == __x._M_node; } bool operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT { 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() _GLIBCXX_NOEXCEPT : _M_node() { } explicit _List_const_iterator(const __detail::_List_node_base* __x) _GLIBCXX_NOEXCEPT : _M_node(__x) { } _List_const_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT : _M_node(__x._M_node) { } iterator _M_const_cast() const _GLIBCXX_NOEXCEPT { return iterator(const_cast<__detail::_List_node_base>(_M_node)); } // Must downcast from List_node_base to _List_node to get to value. reference operator() const _GLIBCXX_NOEXCEPT { return static_cast<_Node>(_M_node)->_M_valptr(); } pointer operator->() const _GLIBCXX_NOEXCEPT { return static_cast<_Node>(_M_node)->_M_valptr(); } _Self& operator++() _GLIBCXX_NOEXCEPT { _M_node = _M_node->_M_next; return this; } _Self operator++(int) _GLIBCXX_NOEXCEPT { _Self __tmp = this; _M_node = _M_node->_M_next; return __tmp; } _Self& operator--() _GLIBCXX_NOEXCEPT { _M_node = _M_node->_M_prev; return this; } _Self operator--(int) _GLIBCXX_NOEXCEPT { _Self __tmp = this; _M_node = _M_node->_M_prev; return __tmp; } bool operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT { return _M_node == __x._M_node; } bool operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT { 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) _GLIBCXX_NOEXCEPT { return __x._M_node == __y._M_node; } template<typename _Val> inline bool operator!=(const _List_iterator<_Val>& __x, const _List_const_iterator<_Val>& __y) _GLIBCXX_NOEXCEPT { return __x._M_node != __y._M_node; } _GLIBCXX_BEGIN_NAMESPACE_CXX11 /// See bits/stl_deque.h's _Deque_base for an explanation. template<typename _Tp, typename _Alloc> class _List_base { protected: typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_Tp>::other _Tp_alloc_type; typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tp_alloc_traits; typedef typename _Tp_alloc_traits::template rebind<_List_node<_Tp> >::other _Node_alloc_type; typedef __gnu_cxx::__alloc_traits<_Node_alloc_type> _Node_alloc_traits; #if !_GLIBCXX_INLINE_VERSION static size_t _S_distance(const __detail::_List_node_base* __first, const __detail::_List_node_base* __last) { size_t __n = 0; while (__first != __last) { __first = __first->_M_next; ++__n; } return __n; } #endif struct _List_impl : public _Node_alloc_type { __detail::_List_node_header _M_node; _List_impl() _GLIBCXX_NOEXCEPT_IF( is_nothrow_default_constructible<_Node_alloc_type>::value) : _Node_alloc_type() { } _List_impl(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT : _Node_alloc_type(__a) { } #if __cplusplus >= 201103L _List_impl(_List_impl&&) = default; _List_impl(_Node_alloc_type&& __a, _List_impl&& __x) : _Node_alloc_type(std::move(__a)), _M_node(std::move(__x._M_node)) { } _List_impl(_Node_alloc_type&& __a) noexcept : _Node_alloc_type(std::move(__a)) { } #endif }; _List_impl _M_impl; #if _GLIBCXX_USE_CXX11_ABI size_t _M_get_size() const { return _M_impl._M_node._M_size; } void _M_set_size(size_t __n) { _M_impl._M_node._M_size = __n; } void _M_inc_size(size_t __n) { _M_impl._M_node._M_size += __n; } void _M_dec_size(size_t __n) { _M_impl._M_node._M_size -= __n; } # if !_GLIBCXX_INLINE_VERSION size_t _M_distance(const __detail::_List_node_base* __first, const __detail::_List_node_base* __last) const { return _S_distance(__first, __last); } // return the stored size size_t _M_node_count() const { return _M_get_size(); } # endif #else // dummy implementations used when the size is not stored size_t _M_get_size() const { return 0; } void _M_set_size(size_t) { } void _M_inc_size(size_t) { } void _M_dec_size(size_t) { } # if !_GLIBCXX_INLINE_VERSION size_t _M_distance(const void, const void) const { return 0; } // count the number of nodes size_t _M_node_count() const { return _S_distance(_M_impl._M_node._M_next, std::__addressof(_M_impl._M_node)); } # endif #endif typename _Node_alloc_traits::pointer _M_get_node() { return _Node_alloc_traits::allocate(_M_impl, 1); } void _M_put_node(typename _Node_alloc_traits::pointer __p) _GLIBCXX_NOEXCEPT { _Node_alloc_traits::deallocate(_M_impl, __p, 1); } public: typedef _Alloc allocator_type; _Node_alloc_type& _M_get_Node_allocator() _GLIBCXX_NOEXCEPT { return _M_impl; } const _Node_alloc_type& _M_get_Node_allocator() const _GLIBCXX_NOEXCEPT { return _M_impl; } #if __cplusplus >= 201103L _List_base() = default; #else _List_base() { } #endif _List_base(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT : _M_impl(__a) { } #if __cplusplus >= 201103L _List_base(_List_base&&) = default; # if !_GLIBCXX_INLINE_VERSION _List_base(_List_base&& __x, _Node_alloc_type&& __a) : _M_impl(std::move(__a)) { if (__x._M_get_Node_allocator() == _M_get_Node_allocator()) _M_move_nodes(std::move(__x)); // else caller must move individual elements. } # endif // Used when allocator is_always_equal. _List_base(_Node_alloc_type&& __a, _List_base&& __x) : _M_impl(std::move(__a), std::move(__x._M_impl)) { } // Used when allocator !is_always_equal. _List_base(_Node_alloc_type&& __a) : _M_impl(std::move(__a)) { } void _M_move_nodes(_List_base&& __x) { _M_impl._M_node._M_move_nodes(std::move(__x._M_impl._M_node)); } #endif // This is what actually destroys the list. ~_List_base() _GLIBCXX_NOEXCEPT { _M_clear(); } void _M_clear() _GLIBCXX_NOEXCEPT; void _M_init() _GLIBCXX_NOEXCEPT { this->_M_impl._M_node._M_init(); } }; /** * @brief A standard container with linear time access to elements, * and fixed time insertion/deletion at any point in the sequence. * * @ingroup sequences * * @tparam _Tp Type of element. * @tparam _Alloc Allocator type, defaults to allocator<_Tp>. * * 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> { #ifdef _GLIBCXX_CONCEPT_CHECKS // concept requirements typedef typename _Alloc::value_type _Alloc_value_type; # if __cplusplus < 201103L __glibcxx_class_requires(_Tp, _SGIAssignableConcept) # endif __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept) #endif #if __cplusplus >= 201103L static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value, "std::list must have a non-const, non-volatile value_type"); # ifdef __STRICT_ANSI__ static_assert(is_same<typename _Alloc::value_type, _Tp>::value, "std::list must have the same value_type as its allocator"); # endif #endif typedef _List_base<_Tp, _Alloc> _Base; typedef typename _Base::_Tp_alloc_type _Tp_alloc_type; typedef typename _Base::_Tp_alloc_traits _Tp_alloc_traits; typedef typename _Base::_Node_alloc_type _Node_alloc_type; typedef typename _Base::_Node_alloc_traits _Node_alloc_traits; public: typedef _Tp value_type; typedef typename _Tp_alloc_traits::pointer pointer; typedef typename _Tp_alloc_traits::const_pointer const_pointer; typedef typename _Tp_alloc_traits::reference reference; typedef typename _Tp_alloc_traits::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_Node_allocator; /* * @param __args An instance of user data. * * Allocates space for a new node and constructs a copy of * @a __args in it. / #if __cplusplus < 201103L _Node _M_create_node(const value_type& __x) { _Node* __p = this->_M_get_node(); __try { _Tp_alloc_type __alloc(_M_get_Node_allocator()); __alloc.construct(__p->_M_valptr(), __x); } __catch(...) { _M_put_node(__p); __throw_exception_again; } return __p; } #else template<typename... _Args> _Node* _M_create_node(_Args&&... __args) { auto __p = this->_M_get_node(); auto& __alloc = _M_get_Node_allocator(); __allocated_ptr<_Node_alloc_type> __guard{__alloc, __p}; _Node_alloc_traits::construct(__alloc, __p->_M_valptr(), std::forward<_Args>(__args)...); __guard = nullptr; return __p; } #endif #if _GLIBCXX_USE_CXX11_ABI static size_t _S_distance(const_iterator __first, const_iterator __last) { return std::distance(__first, __last); } // return the stored size size_t _M_node_count() const { return this->_M_get_size(); } #else // dummy implementations used when the size is not stored static size_t _S_distance(const_iterator, const_iterator) { return 0; } // count the number of nodes size_t _M_node_count() const { return std::distance(begin(), end()); } #endif public: // [23.2.2.1] construct/copy/destroy // (assign() and get_allocator() are also listed in this section) /** * @brief Creates a %list with no elements. / #if __cplusplus >= 201103L list() = default; #else list() { } #endif /* * @brief Creates a %list with no elements. * @param __a An allocator object. / explicit list(const allocator_type& __a) _GLIBCXX_NOEXCEPT : _Base(_Node_alloc_type(__a)) { } #if __cplusplus >= 201103L /* * @brief Creates a %list with default constructed elements. * @param __n The number of elements to initially create. * @param __a An allocator object. * * This constructor fills the %list with @a __n default * constructed elements. / explicit list(size_type __n, const allocator_type& __a = allocator_type()) : _Base(_Node_alloc_type(__a)) { _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 (unless the allocator traits dictate a different object). / list(const list& __x) : _Base(_Node_alloc_traits:: _S_select_on_copy(__x._M_get_Node_allocator())) { _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); } #if __cplusplus >= 201103L /* * @brief %List move constructor. * * The newly-created %list contains the exact contents of the moved * instance. The contents of the moved instance are a valid, but * unspecified %list. / list(list&&) = default; /* * @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()); } list(const list& __x, const allocator_type& __a) : _Base(_Node_alloc_type(__a)) { _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); } private: list(list&& __x, const allocator_type& __a, true_type) noexcept : _Base(_Node_alloc_type(__a), std::move(__x)) { } list(list&& __x, const allocator_type& __a, false_type) : _Base(_Node_alloc_type(__a)) { if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator()) this->_M_move_nodes(std::move(__x)); else insert(begin(), std::__make_move_if_noexcept_iterator(__x.begin()), std::__make_move_if_noexcept_iterator(__x.end())); } public: list(list&& __x, const allocator_type& __a) noexcept(_Node_alloc_traits::_S_always_equal()) : list(std::move(__x), __a, typename _Node_alloc_traits::is_always_equal{}) { } #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)). / #if __cplusplus >= 201103L template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> list(_InputIterator __first, _InputIterator __last, const allocator_type& __a = allocator_type()) : _Base(_Node_alloc_type(__a)) { _M_initialize_dispatch(__first, __last, __false_type()); } #else 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()); } #endif #if __cplusplus >= 201103L /* * 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. / ~list() = default; #endif /* * @brief %List assignment operator. * @param __x A %list of identical element and allocator types. * * All the elements of @a __x are copied. * * Whether the allocator is copied depends on the allocator traits. / list& operator=(const list& __x); #if __cplusplus >= 201103L /* * @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). * * Afterwards @a __x is a valid, but unspecified %list * * Whether the allocator is moved depends on the allocator traits. / list& operator=(list&& __x) noexcept(_Node_alloc_traits::_S_nothrow_move()) { constexpr bool __move_storage = _Node_alloc_traits::_S_propagate_on_move_assign() \|\| _Node_alloc_traits::_S_always_equal(); _M_move_assign(std::move(__x), __bool_constant<__move_storage>()); 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. / 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. / #if __cplusplus >= 201103L template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> void assign(_InputIterator __first, _InputIterator __last) { _M_assign_dispatch(__first, __last, __false_type()); } #else 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()); } #endif #if __cplusplus >= 201103L /* * @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->_M_assign_dispatch(__l.begin(), __l.end(), __false_type()); } #endif /// Get a copy of the memory allocation object. allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return allocator_type(_Base::_M_get_Node_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()); } #if __cplusplus >= 201103L /* * 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 _M_node_count(); } /* Returns the size() of the largest possible %list. / size_type max_size() const _GLIBCXX_NOEXCEPT { return _Node_alloc_traits::max_size(_M_get_Node_allocator()); } #if __cplusplus >= 201103L /* * @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() _GLIBCXX_NOEXCEPT { return begin(); } /** * Returns a read-only (constant) reference to the data at the first * element of the %list. / const_reference front() const _GLIBCXX_NOEXCEPT { return begin(); } /** * Returns a read/write reference to the data at the last element * of the %list. / reference back() _GLIBCXX_NOEXCEPT { 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 _GLIBCXX_NOEXCEPT { 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); } #if __cplusplus >= 201103L void push_front(value_type&& __x) { this->_M_insert(begin(), std::move(__x)); } template<typename... _Args> #if __cplusplus > 201402L reference #else void #endif emplace_front(_Args&&... __args) { this->_M_insert(begin(), std::forward<_Args>(__args)...); #if __cplusplus > 201402L return front(); #endif } #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() _GLIBCXX_NOEXCEPT { 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); } #if __cplusplus >= 201103L void push_back(value_type&& __x) { this->_M_insert(end(), std::move(__x)); } template<typename... _Args> #if __cplusplus > 201402L reference #else void #endif emplace_back(_Args&&... __args) { this->_M_insert(end(), std::forward<_Args>(__args)...); #if __cplusplus > 201402L return back(); #endif } #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() _GLIBCXX_NOEXCEPT { this->_M_erase(iterator(this->_M_impl._M_node._M_prev)); } #if __cplusplus >= 201103L /* * @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(const_iterator __position, _Args&&... __args); /* * @brief Inserts given value into %list before specified iterator. * @param __position A const_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(const_iterator __position, const value_type& __x); #else /* * @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); #endif #if __cplusplus >= 201103L /* * @brief Inserts given rvalue into %list before specified iterator. * @param __position A const_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(const_iterator __position, value_type&& __x) { return emplace(__position, std::move(__x)); } /* * @brief Inserts the contents of an initializer_list into %list * before specified const_iterator. * @param __p A const_iterator into the %list. * @param __l An initializer_list of value_type. * @return An iterator pointing to the first element inserted * (or __position). * * 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. / iterator insert(const_iterator __p, initializer_list<value_type> __l) { return this->insert(__p, __l.begin(), __l.end()); } #endif #if __cplusplus >= 201103L /* * @brief Inserts a number of copies of given data into the %list. * @param __position A const_iterator into the %list. * @param __n Number of elements to be inserted. * @param __x Data to be inserted. * @return An iterator pointing to the first element inserted * (or __position). * * 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. / iterator insert(const_iterator __position, size_type __n, const value_type& __x); #else /* * @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); } #endif #if __cplusplus >= 201103L /* * @brief Inserts a range into the %list. * @param __position A const_iterator into the %list. * @param __first An input iterator. * @param __last An input iterator. * @return An iterator pointing to the first element inserted * (or __position). * * 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, typename = std::_RequireInputIter<_InputIterator>> iterator insert(const_iterator __position, _InputIterator __first, _InputIterator __last); #else /* * @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); } #endif /* * @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 #if __cplusplus >= 201103L erase(const_iterator __position) noexcept; #else erase(iterator __position); #endif /* * @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 #if __cplusplus >= 201103L erase(const_iterator __first, const_iterator __last) noexcept #else erase(iterator __first, iterator __last) #endif { while (__first != __last) __first = erase(__first); return __last._M_const_cast(); } /* * @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. * * Whether the allocators are swapped depends on the allocator traits. / void swap(list& __x) _GLIBCXX_NOEXCEPT { __detail::_List_node_base::swap(this->_M_impl._M_node, __x._M_impl._M_node); size_t __xsize = __x._M_get_size(); __x._M_set_size(this->_M_get_size()); this->_M_set_size(__xsize); _Node_alloc_traits::_S_on_swap(this->_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 #if __cplusplus >= 201103L splice(const_iterator __position, list&& __x) noexcept #else splice(iterator __position, list& __x) #endif { if (!__x.empty()) { _M_check_equal_allocators(__x); this->_M_transfer(__position._M_const_cast(), __x.begin(), __x.end()); this->_M_inc_size(__x._M_get_size()); __x._M_set_size(0); } } #if __cplusplus >= 201103L void splice(const_iterator __position, list& __x) noexcept { splice(__position, std::move(__x)); } #endif #if __cplusplus >= 201103L /* * @brief Insert element from another %list. * @param __position Const_iterator referencing the element to * insert before. * @param __x Source list. * @param __i Const_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 splice(const_iterator __position, list&& __x, const_iterator __i) noexcept #else /* * @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 splice(iterator __position, list& __x, iterator __i) #endif { iterator __j = __i._M_const_cast(); ++__j; if (__position == __i \|\| __position == __j) return; if (this != std::__addressof(__x)) _M_check_equal_allocators(__x); this->_M_transfer(__position._M_const_cast(), __i._M_const_cast(), __j); this->_M_inc_size(1); __x._M_dec_size(1); } #if __cplusplus >= 201103L /* * @brief Insert element from another %list. * @param __position Const_iterator referencing the element to * insert before. * @param __x Source list. * @param __i Const_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 splice(const_iterator __position, list& __x, const_iterator __i) noexcept { splice(__position, std::move(__x), __i); } #endif #if __cplusplus >= 201103L /* * @brief Insert range from another %list. * @param __position Const_iterator referencing the element to * insert before. * @param __x Source list. * @param __first Const_iterator referencing the start of range in x. * @param __last Const_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 splice(const_iterator __position, list&& __x, const_iterator __first, const_iterator __last) noexcept #else /* * @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 splice(iterator __position, list& __x, iterator __first, iterator __last) #endif { if (__first != __last) { if (this != std::__addressof(__x)) _M_check_equal_allocators(__x); size_t __n = _S_distance(__first, __last); this->_M_inc_size(__n); __x._M_dec_size(__n); this->_M_transfer(__position._M_const_cast(), __first._M_const_cast(), __last._M_const_cast()); } } #if __cplusplus >= 201103L /* * @brief Insert range from another %list. * @param __position Const_iterator referencing the element to * insert before. * @param __x Source list. * @param __first Const_iterator referencing the start of range in x. * @param __last Const_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 splice(const_iterator __position, list& __x, const_iterator __first, const_iterator __last) noexcept { 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. / #if __cplusplus >= 201103L 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(). / #if __cplusplus >= 201103L 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) #if __cplusplus >= 201103L emplace_back(__first); #else push_back(__first); #endif } // 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); } #if __cplusplus >= 201103L // 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. #if __cplusplus < 201103L void _M_insert(iterator __position, const value_type& __x) { _Node __tmp = _M_create_node(__x); __tmp->_M_hook(__position._M_node); this->_M_inc_size(1); } #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); this->_M_inc_size(1); } #endif // Erases element at position given. void _M_erase(iterator __position) _GLIBCXX_NOEXCEPT { this->_M_dec_size(1); __position._M_node->_M_unhook(); _Node* __n = static_cast<_Node>(__position._M_node); #if __cplusplus >= 201103L _Node_alloc_traits::destroy(_M_get_Node_allocator(), __n->_M_valptr()); #else _Tp_alloc_type(_M_get_Node_allocator()).destroy(__n->_M_valptr()); #endif _M_put_node(__n); } // To implement the splice (and merge) bits of N1599. void _M_check_equal_allocators(list& __x) _GLIBCXX_NOEXCEPT { if (std::__alloc_neq<typename _Base::_Node_alloc_type>:: _S_do_it(_M_get_Node_allocator(), __x._M_get_Node_allocator())) __builtin_abort(); } // Used to implement resize. const_iterator _M_resize_pos(size_type& __new_size) const; #if __cplusplus >= 201103L void _M_move_assign(list&& __x, true_type) noexcept { this->_M_clear(); this->_M_move_nodes(std::move(__x)); std::__alloc_on_move(this->_M_get_Node_allocator(), __x._M_get_Node_allocator()); } void _M_move_assign(list&& __x, false_type) { if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator()) _M_move_assign(std::move(__x), true_type{}); else // The rvalue's allocator cannot be moved, or is not equal, // so we need to individually move each element. _M_assign_dispatch(std::__make_move_if_noexcept_iterator(__x.begin()), std::__make_move_if_noexcept_iterator(__x.end()), __false_type{}); } #endif }; #if __cpp_deduction_guides >= 201606 template<typename _InputIterator, typename _ValT = typename iterator_traits<_InputIterator>::value_type, typename _Allocator = allocator<_ValT>, typename = _RequireInputIter<_InputIterator>, typename = _RequireAllocator<_Allocator>> list(_InputIterator, _InputIterator, _Allocator = _Allocator()) -> list<_ValT, _Allocator>; #endif _GLIBCXX_END_NAMESPACE_CXX11 /* * @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) { #if _GLIBCXX_USE_CXX11_ABI if (__x.size() != __y.size()) return false; #endif 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) _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y))) { __x.swap(__y); } _GLIBCXX_END_NAMESPACE_CONTAINER #if _GLIBCXX_USE_CXX11_ABI // Detect when distance is used to compute the size of the whole list. template<typename _Tp> inline ptrdiff_t __distance(_GLIBCXX_STD_C::_List_iterator<_Tp> __first, _GLIBCXX_STD_C::_List_iterator<_Tp> __last, input_iterator_tag __tag) { typedef _GLIBCXX_STD_C::_List_const_iterator<_Tp> _CIter; return std::__distance(_CIter(__first), _CIter(__last), __tag); } template<typename _Tp> inline ptrdiff_t __distance(_GLIBCXX_STD_C::_List_const_iterator<_Tp> __first, _GLIBCXX_STD_C::_List_const_iterator<_Tp> __last, input_iterator_tag) { typedef __detail::_List_node_header _Sentinel; _GLIBCXX_STD_C::_List_const_iterator<_Tp> __beyond = __last; ++__beyond; const bool __whole = __first == __beyond; if (__builtin_constant_p (__whole) && __whole) return static_cast<const _Sentinel>(__last._M_node)->_M_size; ptrdiff_t __n = 0; while (__first != __last) { ++__first; ++__n; } return __n; } #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif /* _STL_LIST_H */ Back

Edit File : stl_list.h | Size : 65.97 KB

// List implementation -*- C++ -*-

// Copyright (C) 2001-2018 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/>.

/*
 *
 * 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>
#include <ext/alloc_traits.h>
#if __cplusplus >= 201103L
#include <initializer_list>
#include <bits/allocated_ptr.h>
#include <ext/aligned_buffer.h>
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

namespace __detail
  {
    // 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;
    };

/// The %list node header.
    struct _List_node_header : public _List_node_base
    {
#if _GLIBCXX_USE_CXX11_ABI
      std::size_t _M_size;
#endif

_List_node_header() _GLIBCXX_NOEXCEPT
      { _M_init(); }

#if __cplusplus >= 201103L
      _List_node_header(_List_node_header&& __x) noexcept
      : _List_node_base{ __x._M_next, __x._M_prev }
# if _GLIBCXX_USE_CXX11_ABI
      , _M_size(__x._M_size)
# endif
      {
	if (__x._M_base()->_M_next == __x._M_base())
	  this->_M_next = this->_M_prev = this;
	else
	  {
	    this->_M_next->_M_prev = this->_M_prev->_M_next = this->_M_base();
	    __x._M_init();
	  }
      }

void
      _M_move_nodes(_List_node_header&& __x)
      {
	_List_node_base* const __xnode = __x._M_base();
	if (__xnode->_M_next == __xnode)
	  _M_init();
	else
	  {
	    _List_node_base* const __node = this->_M_base();
	    __node->_M_next = __xnode->_M_next;
	    __node->_M_prev = __xnode->_M_prev;
	    __node->_M_next->_M_prev = __node->_M_prev->_M_next = __node;
# if _GLIBCXX_USE_CXX11_ABI
	    _M_size = __x._M_size;
# endif
	    __x._M_init();
	  }
      }
#endif

void
      _M_init() _GLIBCXX_NOEXCEPT
      {
	this->_M_next = this->_M_prev = this;
#if _GLIBCXX_USE_CXX11_ABI
	this->_M_size = 0;
#endif
      }

private:
      _List_node_base* _M_base() { return this; }
    };
  } // namespace detail

_GLIBCXX_BEGIN_NAMESPACE_CONTAINER

/// An actual node in the %list.
  template<typename _Tp>
    struct _List_node : public __detail::_List_node_base
    {
#if __cplusplus >= 201103L
      __gnu_cxx::__aligned_membuf<_Tp> _M_storage;
      _Tp*       _M_valptr()       { return _M_storage._M_ptr(); }
      _Tp const* _M_valptr() const { return _M_storage._M_ptr(); }
#else
      _Tp _M_data;
      _Tp*       _M_valptr()       { return std::__addressof(_M_data); }
      _Tp const* _M_valptr() const { return std::__addressof(_M_data); }
#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() _GLIBCXX_NOEXCEPT
      : _M_node() { }

explicit
      _List_iterator(__detail::_List_node_base* __x) _GLIBCXX_NOEXCEPT
      : _M_node(__x) { }

_Self
      _M_const_cast() const _GLIBCXX_NOEXCEPT
      { return *this; }

// Must downcast from _List_node_base to _List_node to get to value.
      reference
      operator*() const _GLIBCXX_NOEXCEPT
      { return *static_cast<_Node*>(_M_node)->_M_valptr(); }

pointer
      operator->() const _GLIBCXX_NOEXCEPT
      { return static_cast<_Node*>(_M_node)->_M_valptr(); }

_Self&
      operator++() _GLIBCXX_NOEXCEPT
      {
	_M_node = _M_node->_M_next;
	return *this;
      }

_Self
      operator++(int) _GLIBCXX_NOEXCEPT
      {
	_Self __tmp = *this;
	_M_node = _M_node->_M_next;
	return __tmp;
      }

_Self&
      operator--() _GLIBCXX_NOEXCEPT
      {
	_M_node = _M_node->_M_prev;
	return *this;
      }

_Self
      operator--(int) _GLIBCXX_NOEXCEPT
      {
	_Self __tmp = *this;
	_M_node = _M_node->_M_prev;
	return __tmp;
      }

bool
      operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
      { return _M_node == __x._M_node; }

bool
      operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT
      { 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() _GLIBCXX_NOEXCEPT
      : _M_node() { }

explicit
      _List_const_iterator(const __detail::_List_node_base* __x)
      _GLIBCXX_NOEXCEPT
      : _M_node(__x) { }

_List_const_iterator(const iterator& __x) _GLIBCXX_NOEXCEPT
      : _M_node(__x._M_node) { }

iterator
      _M_const_cast() const _GLIBCXX_NOEXCEPT
      { return iterator(const_cast<__detail::_List_node_base*>(_M_node)); }

// Must downcast from List_node_base to _List_node to get to value.
      reference
      operator*() const _GLIBCXX_NOEXCEPT
      { return *static_cast<_Node*>(_M_node)->_M_valptr(); }

pointer
      operator->() const _GLIBCXX_NOEXCEPT
      { return static_cast<_Node*>(_M_node)->_M_valptr(); }

_Self&
      operator++() _GLIBCXX_NOEXCEPT
      {
	_M_node = _M_node->_M_next;
	return *this;
      }

_Self
      operator++(int) _GLIBCXX_NOEXCEPT
      {
	_Self __tmp = *this;
	_M_node = _M_node->_M_next;
	return __tmp;
      }

_Self&
      operator--() _GLIBCXX_NOEXCEPT
      {
	_M_node = _M_node->_M_prev;
	return *this;
      }

_Self
      operator--(int) _GLIBCXX_NOEXCEPT
      {
	_Self __tmp = *this;
	_M_node = _M_node->_M_prev;
	return __tmp;
      }

bool
      operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
      { return _M_node == __x._M_node; }

bool
      operator!=(const _Self& __x) const _GLIBCXX_NOEXCEPT
      { 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) _GLIBCXX_NOEXCEPT
    { return __x._M_node == __y._M_node; }

template<typename _Val>
    inline bool
    operator!=(const _List_iterator<_Val>& __x,
	       const _List_const_iterator<_Val>& __y) _GLIBCXX_NOEXCEPT
    { return __x._M_node != __y._M_node; }

_GLIBCXX_BEGIN_NAMESPACE_CXX11
  /// See bits/stl_deque.h's _Deque_base for an explanation.
  template<typename _Tp, typename _Alloc>
    class _List_base
    {
    protected:
      typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
	rebind<_Tp>::other				_Tp_alloc_type;
      typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type>	_Tp_alloc_traits;
      typedef typename _Tp_alloc_traits::template
	rebind<_List_node<_Tp> >::other _Node_alloc_type;
      typedef __gnu_cxx::__alloc_traits<_Node_alloc_type> _Node_alloc_traits;

#if !_GLIBCXX_INLINE_VERSION
      static size_t
      _S_distance(const __detail::_List_node_base* __first,
		  const __detail::_List_node_base* __last)
      {
	size_t __n = 0;
	while (__first != __last)
	  {
	    __first = __first->_M_next;
	    ++__n;
	  }
	return __n;
      }
#endif

struct _List_impl
      : public _Node_alloc_type
      {
	__detail::_List_node_header _M_node;

_List_impl() _GLIBCXX_NOEXCEPT_IF(
	    is_nothrow_default_constructible<_Node_alloc_type>::value)
	: _Node_alloc_type()
	{ }

_List_impl(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT
	: _Node_alloc_type(__a)
	{ }

#if __cplusplus >= 201103L
	_List_impl(_List_impl&&) = default;

_List_impl(_Node_alloc_type&& __a, _List_impl&& __x)
	: _Node_alloc_type(std::move(__a)), _M_node(std::move(__x._M_node))
	{ }

_List_impl(_Node_alloc_type&& __a) noexcept
	: _Node_alloc_type(std::move(__a))
	{ }
#endif
      };

_List_impl _M_impl;

#if _GLIBCXX_USE_CXX11_ABI
      size_t _M_get_size() const { return _M_impl._M_node._M_size; }

void _M_set_size(size_t __n) { _M_impl._M_node._M_size = __n; }

void _M_inc_size(size_t __n) { _M_impl._M_node._M_size += __n; }

void _M_dec_size(size_t __n) { _M_impl._M_node._M_size -= __n; }

# if !_GLIBCXX_INLINE_VERSION
      size_t
      _M_distance(const __detail::_List_node_base* __first,
		  const __detail::_List_node_base* __last) const
      { return _S_distance(__first, __last); }

// return the stored size
      size_t _M_node_count() const { return _M_get_size(); }
# endif
#else
      // dummy implementations used when the size is not stored
      size_t _M_get_size() const { return 0; }
      void _M_set_size(size_t) { }
      void _M_inc_size(size_t) { }
      void _M_dec_size(size_t) { }

# if !_GLIBCXX_INLINE_VERSION
      size_t _M_distance(const void*, const void*) const { return 0; }

// count the number of nodes
      size_t _M_node_count() const
      {
	return _S_distance(_M_impl._M_node._M_next,
			   std::__addressof(_M_impl._M_node));
      }
# endif
#endif

typename _Node_alloc_traits::pointer
      _M_get_node()
      { return _Node_alloc_traits::allocate(_M_impl, 1); }

void
      _M_put_node(typename _Node_alloc_traits::pointer __p) _GLIBCXX_NOEXCEPT
      { _Node_alloc_traits::deallocate(_M_impl, __p, 1); }

public:
      typedef _Alloc allocator_type;

_Node_alloc_type&
      _M_get_Node_allocator() _GLIBCXX_NOEXCEPT
      { return _M_impl; }

const _Node_alloc_type&
      _M_get_Node_allocator() const _GLIBCXX_NOEXCEPT
      { return _M_impl; }

#if __cplusplus >= 201103L
      _List_base() = default;
#else
      _List_base() { }
#endif

_List_base(const _Node_alloc_type& __a) _GLIBCXX_NOEXCEPT
      : _M_impl(__a)
      { }

#if __cplusplus >= 201103L
      _List_base(_List_base&&) = default;

# if !_GLIBCXX_INLINE_VERSION
      _List_base(_List_base&& __x, _Node_alloc_type&& __a)
      : _M_impl(std::move(__a))
      {
	if (__x._M_get_Node_allocator() == _M_get_Node_allocator())
	  _M_move_nodes(std::move(__x));
	// else caller must move individual elements.
      }
# endif

// Used when allocator is_always_equal.
      _List_base(_Node_alloc_type&& __a, _List_base&& __x)
      : _M_impl(std::move(__a), std::move(__x._M_impl))
      { }

// Used when allocator !is_always_equal.
      _List_base(_Node_alloc_type&& __a)
      : _M_impl(std::move(__a))
      { }

void
      _M_move_nodes(_List_base&& __x)
      { _M_impl._M_node._M_move_nodes(std::move(__x._M_impl._M_node)); }
#endif

// This is what actually destroys the list.
      ~_List_base() _GLIBCXX_NOEXCEPT
      { _M_clear(); }

void
      _M_clear() _GLIBCXX_NOEXCEPT;

void
      _M_init() _GLIBCXX_NOEXCEPT
      { this->_M_impl._M_node._M_init(); }
    };

/**
   *  @brief A standard container with linear time access to elements,
   *  and fixed time insertion/deletion at any point in the sequence.
   *
   *  @ingroup sequences
   *
   *  @tparam _Tp  Type of element.
   *  @tparam _Alloc  Allocator type, defaults to allocator<_Tp>.
   *
   *  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>
    {
#ifdef _GLIBCXX_CONCEPT_CHECKS
      // concept requirements
      typedef typename _Alloc::value_type		_Alloc_value_type;
# if __cplusplus < 201103L
      __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
# endif
      __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
#endif

#if __cplusplus >= 201103L
      static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value,
	  "std::list must have a non-const, non-volatile value_type");
# ifdef __STRICT_ANSI__
      static_assert(is_same<typename _Alloc::value_type, _Tp>::value,
	  "std::list must have the same value_type as its allocator");
# endif
#endif

typedef _List_base<_Tp, _Alloc>			_Base;
      typedef typename _Base::_Tp_alloc_type		_Tp_alloc_type;
      typedef typename _Base::_Tp_alloc_traits		_Tp_alloc_traits;
      typedef typename _Base::_Node_alloc_type		_Node_alloc_type;
      typedef typename _Base::_Node_alloc_traits	_Node_alloc_traits;

public:
      typedef _Tp					 value_type;
      typedef typename _Tp_alloc_traits::pointer	 pointer;
      typedef typename _Tp_alloc_traits::const_pointer	 const_pointer;
      typedef typename _Tp_alloc_traits::reference	 reference;
      typedef typename _Tp_alloc_traits::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_Node_allocator;

/**
       *  @param  __args  An instance of user data.
       *
       *  Allocates space for a new node and constructs a copy of
       *  @a __args in it.
       */
#if __cplusplus < 201103L
      _Node*
      _M_create_node(const value_type& __x)
      {
	_Node* __p = this->_M_get_node();
	__try
	  {
	    _Tp_alloc_type __alloc(_M_get_Node_allocator());
	    __alloc.construct(__p->_M_valptr(), __x);
	  }
	__catch(...)
	  {
	    _M_put_node(__p);
	    __throw_exception_again;
	  }
	return __p;
      }
#else
      template<typename... _Args>
	_Node*
	_M_create_node(_Args&&... __args)
	{
	  auto __p = this->_M_get_node();
	  auto& __alloc = _M_get_Node_allocator();
	  __allocated_ptr<_Node_alloc_type> __guard{__alloc, __p};
	  _Node_alloc_traits::construct(__alloc, __p->_M_valptr(),
					std::forward<_Args>(__args)...);
	  __guard = nullptr;
	  return __p;
	}
#endif

#if _GLIBCXX_USE_CXX11_ABI
      static size_t
      _S_distance(const_iterator __first, const_iterator __last)
      { return std::distance(__first, __last); }

// return the stored size
      size_t
      _M_node_count() const
      { return this->_M_get_size(); }
#else
      // dummy implementations used when the size is not stored
      static size_t
      _S_distance(const_iterator, const_iterator)
      { return 0; }

// count the number of nodes
      size_t
      _M_node_count() const
      { return std::distance(begin(), end()); }
#endif

public:
      // [23.2.2.1] construct/copy/destroy
      // (assign() and get_allocator() are also listed in this section)

/**
       *  @brief  Creates a %list with no elements.
       */
#if __cplusplus >= 201103L
      list() = default;
#else
      list() { }
#endif

/**
       *  @brief  Creates a %list with no elements.
       *  @param  __a  An allocator object.
       */
      explicit
      list(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      : _Base(_Node_alloc_type(__a)) { }

#if __cplusplus >= 201103L
      /**
       *  @brief  Creates a %list with default constructed elements.
       *  @param  __n  The number of elements to initially create.
       *  @param  __a  An allocator object.
       *
       *  This constructor fills the %list with @a __n default
       *  constructed elements.
       */
      explicit
      list(size_type __n, const allocator_type& __a = allocator_type())
      : _Base(_Node_alloc_type(__a))
      { _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 (unless the allocator traits dictate a different object).
       */
      list(const list& __x)
      : _Base(_Node_alloc_traits::
	      _S_select_on_copy(__x._M_get_Node_allocator()))
      { _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); }

#if __cplusplus >= 201103L
      /**
       *  @brief  %List move constructor.
       *
       *  The newly-created %list contains the exact contents of the moved
       *  instance. The contents of the moved instance are a valid, but
       *  unspecified %list.
       */
      list(list&&) = default;

/**
       *  @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()); }

list(const list& __x, const allocator_type& __a)
      : _Base(_Node_alloc_type(__a))
      { _M_initialize_dispatch(__x.begin(), __x.end(), __false_type()); }

private:
      list(list&& __x, const allocator_type& __a, true_type) noexcept
      : _Base(_Node_alloc_type(__a), std::move(__x))
      { }

list(list&& __x, const allocator_type& __a, false_type)
      : _Base(_Node_alloc_type(__a))
      {
	if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator())
	  this->_M_move_nodes(std::move(__x));
	else
	  insert(begin(), std::__make_move_if_noexcept_iterator(__x.begin()),
			  std::__make_move_if_noexcept_iterator(__x.end()));
      }

public:
      list(list&& __x, const allocator_type& __a)
      noexcept(_Node_alloc_traits::_S_always_equal())
      : list(std::move(__x), __a,
	     typename _Node_alloc_traits::is_always_equal{})
      { }
#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)).
       */
#if __cplusplus >= 201103L
      template<typename _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	list(_InputIterator __first, _InputIterator __last,
	     const allocator_type& __a = allocator_type())
	: _Base(_Node_alloc_type(__a))
	{ _M_initialize_dispatch(__first, __last, __false_type()); }
#else
      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());
	}
#endif

#if __cplusplus >= 201103L
      /**
       *  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.
       */
      ~list() = default;
#endif

/**
       *  @brief  %List assignment operator.
       *  @param  __x  A %list of identical element and allocator types.
       *
       *  All the elements of @a __x are copied.
       *
       *  Whether the allocator is copied depends on the allocator traits.
       */
      list&
      operator=(const list& __x);

#if __cplusplus >= 201103L
      /**
       *  @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).
       *
       *  Afterwards @a __x is a valid, but unspecified %list
       *
       *  Whether the allocator is moved depends on the allocator traits.
       */
      list&
      operator=(list&& __x)
      noexcept(_Node_alloc_traits::_S_nothrow_move())
      {
	constexpr bool __move_storage =
	  _Node_alloc_traits::_S_propagate_on_move_assign()
	  || _Node_alloc_traits::_S_always_equal();
	_M_move_assign(std::move(__x), __bool_constant<__move_storage>());
	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.
       */
      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.
       */
#if __cplusplus >= 201103L
      template<typename _InputIterator,
	       typename = std::_RequireInputIter<_InputIterator>>
	void
	assign(_InputIterator __first, _InputIterator __last)
	{ _M_assign_dispatch(__first, __last, __false_type()); }
#else
      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());
	}
#endif

#if __cplusplus >= 201103L
      /**
       *  @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->_M_assign_dispatch(__l.begin(), __l.end(), __false_type()); }
#endif

/// Get a copy of the memory allocation object.
      allocator_type
      get_allocator() const _GLIBCXX_NOEXCEPT
      { return allocator_type(_Base::_M_get_Node_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()); }

#if __cplusplus >= 201103L
      /**
       *  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 _M_node_count(); }

/**  Returns the size() of the largest possible %list.  */
      size_type
      max_size() const _GLIBCXX_NOEXCEPT
      { return _Node_alloc_traits::max_size(_M_get_Node_allocator()); }

#if __cplusplus >= 201103L
      /**
       *  @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() _GLIBCXX_NOEXCEPT
      { return *begin(); }

/**
       *  Returns a read-only (constant) reference to the data at the first
       *  element of the %list.
       */
      const_reference
      front() const _GLIBCXX_NOEXCEPT
      { return *begin(); }

/**
       *  Returns a read/write reference to the data at the last element
       *  of the %list.
       */
      reference
      back() _GLIBCXX_NOEXCEPT
      {
	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 _GLIBCXX_NOEXCEPT
      {
	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); }

#if __cplusplus >= 201103L
      void
      push_front(value_type&& __x)
      { this->_M_insert(begin(), std::move(__x)); }

template<typename... _Args>
#if __cplusplus > 201402L
	reference
#else
	void
#endif
	emplace_front(_Args&&... __args)
	{
	  this->_M_insert(begin(), std::forward<_Args>(__args)...);
#if __cplusplus > 201402L
	  return front();
#endif
	}
#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() _GLIBCXX_NOEXCEPT
      { 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); }

#if __cplusplus >= 201103L
      void
      push_back(value_type&& __x)
      { this->_M_insert(end(), std::move(__x)); }

template<typename... _Args>
#if __cplusplus > 201402L
	reference
#else
	void
#endif
	emplace_back(_Args&&... __args)
	{
	  this->_M_insert(end(), std::forward<_Args>(__args)...);
#if __cplusplus > 201402L
	return back();
#endif
	}
#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() _GLIBCXX_NOEXCEPT
      { this->_M_erase(iterator(this->_M_impl._M_node._M_prev)); }

#if __cplusplus >= 201103L
      /**
       *  @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(const_iterator __position, _Args&&... __args);

/**
       *  @brief  Inserts given value into %list before specified iterator.
       *  @param  __position  A const_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(const_iterator __position, const value_type& __x);
#else
      /**
       *  @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);
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts given rvalue into %list before specified iterator.
       *  @param  __position  A const_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(const_iterator __position, value_type&& __x)
      { return emplace(__position, std::move(__x)); }

/**
       *  @brief  Inserts the contents of an initializer_list into %list
       *          before specified const_iterator.
       *  @param  __p  A const_iterator into the %list.
       *  @param  __l  An initializer_list of value_type.
       *  @return  An iterator pointing to the first element inserted
       *           (or __position).
       *
       *  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.
       */
      iterator
      insert(const_iterator __p, initializer_list<value_type> __l)
      { return this->insert(__p, __l.begin(), __l.end()); }
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts a number of copies of given data into the %list.
       *  @param  __position  A const_iterator into the %list.
       *  @param  __n  Number of elements to be inserted.
       *  @param  __x  Data to be inserted.
       *  @return  An iterator pointing to the first element inserted
       *           (or __position).
       *
       *  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.
       */
      iterator
      insert(const_iterator __position, size_type __n, const value_type& __x);
#else
      /**
       *  @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);
      }
#endif

#if __cplusplus >= 201103L
      /**
       *  @brief  Inserts a range into the %list.
       *  @param  __position  A const_iterator into the %list.
       *  @param  __first  An input iterator.
       *  @param  __last   An input iterator.
       *  @return  An iterator pointing to the first element inserted
       *           (or __position).
       *
       *  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,
	       typename = std::_RequireInputIter<_InputIterator>>
	iterator
	insert(const_iterator __position, _InputIterator __first,
	       _InputIterator __last);
#else
      /**
       *  @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);
	}
#endif

/**
       *  @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
#if __cplusplus >= 201103L
      erase(const_iterator __position) noexcept;
#else
      erase(iterator __position);
#endif

/**
       *  @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
#if __cplusplus >= 201103L
      erase(const_iterator __first, const_iterator __last) noexcept
#else
      erase(iterator __first, iterator __last)
#endif
      {
	while (__first != __last)
	  __first = erase(__first);
	return __last._M_const_cast();
      }

/**
       *  @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.
       *
       *  Whether the allocators are swapped depends on the allocator traits.
       */
      void
      swap(list& __x) _GLIBCXX_NOEXCEPT
      {
	__detail::_List_node_base::swap(this->_M_impl._M_node,
					__x._M_impl._M_node);

size_t __xsize = __x._M_get_size();
	__x._M_set_size(this->_M_get_size());
	this->_M_set_size(__xsize);

_Node_alloc_traits::_S_on_swap(this->_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
#if __cplusplus >= 201103L
      splice(const_iterator __position, list&& __x) noexcept
#else
      splice(iterator __position, list& __x)
#endif
      {
	if (!__x.empty())
	  {
	    _M_check_equal_allocators(__x);

this->_M_transfer(__position._M_const_cast(),
			      __x.begin(), __x.end());

this->_M_inc_size(__x._M_get_size());
	    __x._M_set_size(0);
	  }
      }

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

#if __cplusplus >= 201103L
      /**
       *  @brief  Insert element from another %list.
       *  @param  __position  Const_iterator referencing the element to
       *                      insert before.
       *  @param  __x  Source list.
       *  @param  __i  Const_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
      splice(const_iterator __position, list&& __x, const_iterator __i) noexcept
#else
      /**
       *  @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
      splice(iterator __position, list& __x, iterator __i)
#endif
      {
	iterator __j = __i._M_const_cast();
	++__j;
	if (__position == __i || __position == __j)
	  return;

if (this != std::__addressof(__x))
	  _M_check_equal_allocators(__x);

this->_M_transfer(__position._M_const_cast(),
			  __i._M_const_cast(), __j);

this->_M_inc_size(1);
	__x._M_dec_size(1);
      }

#if __cplusplus >= 201103L
      /**
       *  @brief  Insert range from another %list.
       *  @param  __position  Const_iterator referencing the element to
       *                      insert before.
       *  @param  __x  Source list.
       *  @param  __first  Const_iterator referencing the start of range in x.
       *  @param  __last  Const_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
      splice(const_iterator __position, list&& __x, const_iterator __first,
	     const_iterator __last) noexcept
#else
      /**
       *  @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
      splice(iterator __position, list& __x, iterator __first,
	     iterator __last)
#endif
      {
	if (__first != __last)
	  {
	    if (this != std::__addressof(__x))
	      _M_check_equal_allocators(__x);

size_t __n = _S_distance(__first, __last);
	    this->_M_inc_size(__n);
	    __x._M_dec_size(__n);

this->_M_transfer(__position._M_const_cast(),
			      __first._M_const_cast(),
			      __last._M_const_cast());
	  }
      }

/**
       *  @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.
       */
#if __cplusplus >= 201103L
      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().
       */
#if __cplusplus >= 201103L
      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)
#if __cplusplus >= 201103L
	    emplace_back(*__first);
#else
	    push_back(*__first);
#endif
	}

// 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);
      }

#if __cplusplus >= 201103L
      // 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.
#if __cplusplus < 201103L
      void
      _M_insert(iterator __position, const value_type& __x)
      {
	_Node* __tmp = _M_create_node(__x);
	__tmp->_M_hook(__position._M_node);
	this->_M_inc_size(1);
      }
#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);
	 this->_M_inc_size(1);
       }
#endif

// Erases element at position given.
      void
      _M_erase(iterator __position) _GLIBCXX_NOEXCEPT
      {
	this->_M_dec_size(1);
	__position._M_node->_M_unhook();
	_Node* __n = static_cast<_Node*>(__position._M_node);
#if __cplusplus >= 201103L
	_Node_alloc_traits::destroy(_M_get_Node_allocator(), __n->_M_valptr());
#else
	_Tp_alloc_type(_M_get_Node_allocator()).destroy(__n->_M_valptr());
#endif

_M_put_node(__n);
      }

// To implement the splice (and merge) bits of N1599.
      void
      _M_check_equal_allocators(list& __x) _GLIBCXX_NOEXCEPT
      {
	if (std::__alloc_neq<typename _Base::_Node_alloc_type>::
	    _S_do_it(_M_get_Node_allocator(), __x._M_get_Node_allocator()))
	  __builtin_abort();
      }

// Used to implement resize.
      const_iterator
      _M_resize_pos(size_type& __new_size) const;

#if __cplusplus >= 201103L
      void
      _M_move_assign(list&& __x, true_type) noexcept
      {
	this->_M_clear();
	this->_M_move_nodes(std::move(__x));
	std::__alloc_on_move(this->_M_get_Node_allocator(),
			     __x._M_get_Node_allocator());
      }

void
      _M_move_assign(list&& __x, false_type)
      {
	if (__x._M_get_Node_allocator() == this->_M_get_Node_allocator())
	  _M_move_assign(std::move(__x), true_type{});
	else
	  // The rvalue's allocator cannot be moved, or is not equal,
	  // so we need to individually move each element.
	  _M_assign_dispatch(std::__make_move_if_noexcept_iterator(__x.begin()),
			     std::__make_move_if_noexcept_iterator(__x.end()),
			     __false_type{});
      }
#endif
    };

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

_GLIBCXX_END_NAMESPACE_CXX11

/**
   *  @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)
    {
#if _GLIBCXX_USE_CXX11_ABI
      if (__x.size() != __y.size())
	return false;
#endif

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)
    _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
    { __x.swap(__y); }

_GLIBCXX_END_NAMESPACE_CONTAINER

#if _GLIBCXX_USE_CXX11_ABI

// Detect when distance is used to compute the size of the whole list.
  template<typename _Tp>
    inline ptrdiff_t
    __distance(_GLIBCXX_STD_C::_List_iterator<_Tp> __first,
	       _GLIBCXX_STD_C::_List_iterator<_Tp> __last,
	       input_iterator_tag __tag)
    {
      typedef _GLIBCXX_STD_C::_List_const_iterator<_Tp> _CIter;
      return std::__distance(_CIter(__first), _CIter(__last), __tag);
    }

template<typename _Tp>
    inline ptrdiff_t
    __distance(_GLIBCXX_STD_C::_List_const_iterator<_Tp> __first,
	       _GLIBCXX_STD_C::_List_const_iterator<_Tp> __last,
	       input_iterator_tag)
    {
      typedef __detail::_List_node_header _Sentinel;
      _GLIBCXX_STD_C::_List_const_iterator<_Tp> __beyond = __last;
      ++__beyond;
      const bool __whole = __first == __beyond;
      if (__builtin_constant_p (__whole) && __whole)
	return static_cast<const _Sentinel*>(__last._M_node)->_M_size;

ptrdiff_t __n = 0;
      while (__first != __last)
	{
	  ++__first;
	  ++__n;
	}
      return __n;
    }
#endif

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif /* _STL_LIST_H */

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