xref: /freebsd/contrib/llvm-project/libcxx/include/list (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1// -*- C++ -*-
2//===---------------------------- list ------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_LIST
11#define _LIBCPP_LIST
12
13/*
14    list synopsis
15
16namespace std
17{
18
19template <class T, class Alloc = allocator<T> >
20class list
21{
22public:
23
24    // types:
25    typedef T value_type;
26    typedef Alloc allocator_type;
27    typedef typename allocator_type::reference reference;
28    typedef typename allocator_type::const_reference const_reference;
29    typedef typename allocator_type::pointer pointer;
30    typedef typename allocator_type::const_pointer const_pointer;
31    typedef implementation-defined iterator;
32    typedef implementation-defined const_iterator;
33    typedef implementation-defined size_type;
34    typedef implementation-defined difference_type;
35    typedef reverse_iterator<iterator> reverse_iterator;
36    typedef reverse_iterator<const_iterator> const_reverse_iterator;
37
38    list()
39        noexcept(is_nothrow_default_constructible<allocator_type>::value);
40    explicit list(const allocator_type& a);
41    explicit list(size_type n);
42    explicit list(size_type n, const allocator_type& a); // C++14
43    list(size_type n, const value_type& value);
44    list(size_type n, const value_type& value, const allocator_type& a);
45    template <class Iter>
46        list(Iter first, Iter last);
47    template <class Iter>
48        list(Iter first, Iter last, const allocator_type& a);
49    list(const list& x);
50    list(const list&, const allocator_type& a);
51    list(list&& x)
52        noexcept(is_nothrow_move_constructible<allocator_type>::value);
53    list(list&&, const allocator_type& a);
54    list(initializer_list<value_type>);
55    list(initializer_list<value_type>, const allocator_type& a);
56
57    ~list();
58
59    list& operator=(const list& x);
60    list& operator=(list&& x)
61        noexcept(
62             allocator_type::propagate_on_container_move_assignment::value &&
63             is_nothrow_move_assignable<allocator_type>::value);
64    list& operator=(initializer_list<value_type>);
65    template <class Iter>
66        void assign(Iter first, Iter last);
67    void assign(size_type n, const value_type& t);
68    void assign(initializer_list<value_type>);
69
70    allocator_type get_allocator() const noexcept;
71
72    iterator begin() noexcept;
73    const_iterator begin() const noexcept;
74    iterator end() noexcept;
75    const_iterator end() const noexcept;
76    reverse_iterator rbegin() noexcept;
77    const_reverse_iterator rbegin() const noexcept;
78    reverse_iterator rend() noexcept;
79    const_reverse_iterator rend() const noexcept;
80    const_iterator cbegin() const noexcept;
81    const_iterator cend() const noexcept;
82    const_reverse_iterator crbegin() const noexcept;
83    const_reverse_iterator crend() const noexcept;
84
85    reference front();
86    const_reference front() const;
87    reference back();
88    const_reference back() const;
89
90    bool empty() const noexcept;
91    size_type size() const noexcept;
92    size_type max_size() const noexcept;
93
94    template <class... Args>
95        reference emplace_front(Args&&... args); // reference in C++17
96    void pop_front();
97    template <class... Args>
98        reference emplace_back(Args&&... args);  // reference in C++17
99    void pop_back();
100    void push_front(const value_type& x);
101    void push_front(value_type&& x);
102    void push_back(const value_type& x);
103    void push_back(value_type&& x);
104    template <class... Args>
105        iterator emplace(const_iterator position, Args&&... args);
106    iterator insert(const_iterator position, const value_type& x);
107    iterator insert(const_iterator position, value_type&& x);
108    iterator insert(const_iterator position, size_type n, const value_type& x);
109    template <class Iter>
110        iterator insert(const_iterator position, Iter first, Iter last);
111    iterator insert(const_iterator position, initializer_list<value_type> il);
112
113    iterator erase(const_iterator position);
114    iterator erase(const_iterator position, const_iterator last);
115
116    void resize(size_type sz);
117    void resize(size_type sz, const value_type& c);
118
119    void swap(list&)
120        noexcept(allocator_traits<allocator_type>::is_always_equal::value);  // C++17
121    void clear() noexcept;
122
123    void splice(const_iterator position, list& x);
124    void splice(const_iterator position, list&& x);
125    void splice(const_iterator position, list& x, const_iterator i);
126    void splice(const_iterator position, list&& x, const_iterator i);
127    void splice(const_iterator position, list& x, const_iterator first,
128                                                  const_iterator last);
129    void splice(const_iterator position, list&& x, const_iterator first,
130                                                  const_iterator last);
131
132    size_type remove(const value_type& value);       // void before C++20
133    template <class Pred>
134      size_type remove_if(Pred pred);                // void before C++20
135    size_type unique();                              // void before C++20
136    template <class BinaryPredicate>
137      size_type unique(BinaryPredicate binary_pred); // void before C++20
138    void merge(list& x);
139    void merge(list&& x);
140    template <class Compare>
141        void merge(list& x, Compare comp);
142    template <class Compare>
143        void merge(list&& x, Compare comp);
144    void sort();
145    template <class Compare>
146        void sort(Compare comp);
147    void reverse() noexcept;
148};
149
150
151template <class InputIterator, class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>
152    list(InputIterator, InputIterator, Allocator = Allocator())
153    -> list<typename iterator_traits<InputIterator>::value_type, Allocator>;  // C++17
154
155template <class T, class Alloc>
156    bool operator==(const list<T,Alloc>& x, const list<T,Alloc>& y);
157template <class T, class Alloc>
158    bool operator< (const list<T,Alloc>& x, const list<T,Alloc>& y);
159template <class T, class Alloc>
160    bool operator!=(const list<T,Alloc>& x, const list<T,Alloc>& y);
161template <class T, class Alloc>
162    bool operator> (const list<T,Alloc>& x, const list<T,Alloc>& y);
163template <class T, class Alloc>
164    bool operator>=(const list<T,Alloc>& x, const list<T,Alloc>& y);
165template <class T, class Alloc>
166    bool operator<=(const list<T,Alloc>& x, const list<T,Alloc>& y);
167
168template <class T, class Alloc>
169    void swap(list<T,Alloc>& x, list<T,Alloc>& y)
170         noexcept(noexcept(x.swap(y)));
171
172template <class T, class Allocator, class U>
173    typename list<T, Allocator>::size_type
174    erase(list<T, Allocator>& c, const U& value);       // C++20
175template <class T, class Allocator, class Predicate>
176    typename list<T, Allocator>::size_type
177    erase_if(list<T, Allocator>& c, Predicate pred);    // C++20
178
179}  // std
180
181*/
182
183#include <__config>
184
185#include <memory>
186#include <limits>
187#include <initializer_list>
188#include <iterator>
189#include <algorithm>
190#include <type_traits>
191#include <version>
192
193#include <__debug>
194
195#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
196#pragma GCC system_header
197#endif
198
199_LIBCPP_PUSH_MACROS
200#include <__undef_macros>
201
202
203_LIBCPP_BEGIN_NAMESPACE_STD
204
205template <class _Tp, class _VoidPtr> struct __list_node;
206template <class _Tp, class _VoidPtr> struct __list_node_base;
207
208template <class _Tp, class _VoidPtr>
209struct __list_node_pointer_traits {
210  typedef typename __rebind_pointer<_VoidPtr, __list_node<_Tp, _VoidPtr> >::type
211        __node_pointer;
212  typedef typename __rebind_pointer<_VoidPtr, __list_node_base<_Tp, _VoidPtr> >::type
213        __base_pointer;
214
215#if defined(_LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB)
216  typedef __base_pointer __link_pointer;
217#else
218  typedef typename conditional<
219          is_pointer<_VoidPtr>::value,
220          __base_pointer,
221          __node_pointer
222  >::type __link_pointer;
223#endif
224
225  typedef typename conditional<
226          is_same<__link_pointer, __node_pointer>::value,
227          __base_pointer,
228          __node_pointer
229  >::type __non_link_pointer;
230
231  static _LIBCPP_INLINE_VISIBILITY
232  __link_pointer __unsafe_link_pointer_cast(__link_pointer __p) {
233      return __p;
234  }
235
236  static _LIBCPP_INLINE_VISIBILITY
237  __link_pointer __unsafe_link_pointer_cast(__non_link_pointer __p) {
238      return static_cast<__link_pointer>(static_cast<_VoidPtr>(__p));
239  }
240
241};
242
243template <class _Tp, class _VoidPtr>
244struct __list_node_base
245{
246    typedef __list_node_pointer_traits<_Tp, _VoidPtr> _NodeTraits;
247    typedef typename _NodeTraits::__node_pointer __node_pointer;
248    typedef typename _NodeTraits::__base_pointer __base_pointer;
249    typedef typename _NodeTraits::__link_pointer __link_pointer;
250
251    __link_pointer __prev_;
252    __link_pointer __next_;
253
254    _LIBCPP_INLINE_VISIBILITY
255    __list_node_base() : __prev_(_NodeTraits::__unsafe_link_pointer_cast(__self())),
256                         __next_(_NodeTraits::__unsafe_link_pointer_cast(__self())) {}
257
258    _LIBCPP_INLINE_VISIBILITY
259    __base_pointer __self() {
260        return pointer_traits<__base_pointer>::pointer_to(*this);
261    }
262
263    _LIBCPP_INLINE_VISIBILITY
264    __node_pointer __as_node() {
265        return static_cast<__node_pointer>(__self());
266    }
267};
268
269template <class _Tp, class _VoidPtr>
270struct __list_node
271    : public __list_node_base<_Tp, _VoidPtr>
272{
273    _Tp __value_;
274
275    typedef __list_node_base<_Tp, _VoidPtr> __base;
276    typedef typename __base::__link_pointer __link_pointer;
277
278    _LIBCPP_INLINE_VISIBILITY
279    __link_pointer __as_link() {
280        return static_cast<__link_pointer>(__base::__self());
281    }
282};
283
284template <class _Tp, class _Alloc = allocator<_Tp> > class _LIBCPP_TEMPLATE_VIS list;
285template <class _Tp, class _Alloc> class __list_imp;
286template <class _Tp, class _VoidPtr> class _LIBCPP_TEMPLATE_VIS __list_const_iterator;
287
288template <class _Tp, class _VoidPtr>
289class _LIBCPP_TEMPLATE_VIS __list_iterator
290{
291    typedef __list_node_pointer_traits<_Tp, _VoidPtr> _NodeTraits;
292    typedef typename _NodeTraits::__link_pointer __link_pointer;
293
294    __link_pointer __ptr_;
295
296#if _LIBCPP_DEBUG_LEVEL >= 2
297    _LIBCPP_INLINE_VISIBILITY
298    explicit __list_iterator(__link_pointer __p, const void* __c) _NOEXCEPT
299        : __ptr_(__p)
300    {
301        __get_db()->__insert_ic(this, __c);
302    }
303#else
304    _LIBCPP_INLINE_VISIBILITY
305    explicit __list_iterator(__link_pointer __p) _NOEXCEPT : __ptr_(__p) {}
306#endif
307
308
309
310    template<class, class> friend class list;
311    template<class, class> friend class __list_imp;
312    template<class, class> friend class __list_const_iterator;
313public:
314    typedef bidirectional_iterator_tag       iterator_category;
315    typedef _Tp                              value_type;
316    typedef value_type&                      reference;
317    typedef typename __rebind_pointer<_VoidPtr, value_type>::type pointer;
318    typedef typename pointer_traits<pointer>::difference_type difference_type;
319
320    _LIBCPP_INLINE_VISIBILITY
321    __list_iterator() _NOEXCEPT : __ptr_(nullptr)
322    {
323#if _LIBCPP_DEBUG_LEVEL >= 2
324        __get_db()->__insert_i(this);
325#endif
326    }
327
328#if _LIBCPP_DEBUG_LEVEL >= 2
329
330    _LIBCPP_INLINE_VISIBILITY
331    __list_iterator(const __list_iterator& __p)
332        : __ptr_(__p.__ptr_)
333    {
334        __get_db()->__iterator_copy(this, &__p);
335    }
336
337    _LIBCPP_INLINE_VISIBILITY
338    ~__list_iterator()
339    {
340        __get_db()->__erase_i(this);
341    }
342
343    _LIBCPP_INLINE_VISIBILITY
344    __list_iterator& operator=(const __list_iterator& __p)
345    {
346        if (this != &__p)
347        {
348            __get_db()->__iterator_copy(this, &__p);
349            __ptr_ = __p.__ptr_;
350        }
351        return *this;
352    }
353
354#endif  // _LIBCPP_DEBUG_LEVEL >= 2
355
356    _LIBCPP_INLINE_VISIBILITY
357    reference operator*() const
358    {
359#if _LIBCPP_DEBUG_LEVEL >= 2
360        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
361                       "Attempted to dereference a non-dereferenceable list::iterator");
362#endif
363        return __ptr_->__as_node()->__value_;
364    }
365    _LIBCPP_INLINE_VISIBILITY
366    pointer operator->() const
367    {
368#if _LIBCPP_DEBUG_LEVEL >= 2
369        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
370                       "Attempted to dereference a non-dereferenceable list::iterator");
371#endif
372        return pointer_traits<pointer>::pointer_to(__ptr_->__as_node()->__value_);
373    }
374
375    _LIBCPP_INLINE_VISIBILITY
376    __list_iterator& operator++()
377    {
378#if _LIBCPP_DEBUG_LEVEL >= 2
379        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
380                       "Attempted to increment non-incrementable list::iterator");
381#endif
382        __ptr_ = __ptr_->__next_;
383        return *this;
384    }
385    _LIBCPP_INLINE_VISIBILITY
386    __list_iterator operator++(int) {__list_iterator __t(*this); ++(*this); return __t;}
387
388    _LIBCPP_INLINE_VISIBILITY
389    __list_iterator& operator--()
390    {
391#if _LIBCPP_DEBUG_LEVEL >= 2
392        _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
393                       "Attempted to decrement non-decrementable list::iterator");
394#endif
395        __ptr_ = __ptr_->__prev_;
396        return *this;
397    }
398    _LIBCPP_INLINE_VISIBILITY
399    __list_iterator operator--(int) {__list_iterator __t(*this); --(*this); return __t;}
400
401    friend _LIBCPP_INLINE_VISIBILITY
402    bool operator==(const __list_iterator& __x, const __list_iterator& __y)
403    {
404        return __x.__ptr_ == __y.__ptr_;
405    }
406    friend _LIBCPP_INLINE_VISIBILITY
407     bool operator!=(const __list_iterator& __x, const __list_iterator& __y)
408        {return !(__x == __y);}
409};
410
411template <class _Tp, class _VoidPtr>
412class _LIBCPP_TEMPLATE_VIS __list_const_iterator
413{
414    typedef __list_node_pointer_traits<_Tp, _VoidPtr> _NodeTraits;
415    typedef typename _NodeTraits::__link_pointer __link_pointer;
416
417    __link_pointer __ptr_;
418
419#if _LIBCPP_DEBUG_LEVEL >= 2
420    _LIBCPP_INLINE_VISIBILITY
421    explicit __list_const_iterator(__link_pointer __p, const void* __c) _NOEXCEPT
422        : __ptr_(__p)
423    {
424        __get_db()->__insert_ic(this, __c);
425    }
426#else
427    _LIBCPP_INLINE_VISIBILITY
428    explicit __list_const_iterator(__link_pointer __p) _NOEXCEPT : __ptr_(__p) {}
429#endif
430
431    template<class, class> friend class list;
432    template<class, class> friend class __list_imp;
433public:
434    typedef bidirectional_iterator_tag       iterator_category;
435    typedef _Tp                              value_type;
436    typedef const value_type&                reference;
437    typedef typename __rebind_pointer<_VoidPtr, const value_type>::type pointer;
438    typedef typename pointer_traits<pointer>::difference_type difference_type;
439
440    _LIBCPP_INLINE_VISIBILITY
441    __list_const_iterator() _NOEXCEPT : __ptr_(nullptr)
442    {
443#if _LIBCPP_DEBUG_LEVEL >= 2
444        __get_db()->__insert_i(this);
445#endif
446    }
447    _LIBCPP_INLINE_VISIBILITY
448    __list_const_iterator(const __list_iterator<_Tp, _VoidPtr>& __p) _NOEXCEPT
449        : __ptr_(__p.__ptr_)
450    {
451#if _LIBCPP_DEBUG_LEVEL >= 2
452        __get_db()->__iterator_copy(this, &__p);
453#endif
454    }
455
456#if _LIBCPP_DEBUG_LEVEL >= 2
457
458    _LIBCPP_INLINE_VISIBILITY
459    __list_const_iterator(const __list_const_iterator& __p)
460        : __ptr_(__p.__ptr_)
461    {
462        __get_db()->__iterator_copy(this, &__p);
463    }
464
465    _LIBCPP_INLINE_VISIBILITY
466    ~__list_const_iterator()
467    {
468        __get_db()->__erase_i(this);
469    }
470
471    _LIBCPP_INLINE_VISIBILITY
472    __list_const_iterator& operator=(const __list_const_iterator& __p)
473    {
474        if (this != &__p)
475        {
476            __get_db()->__iterator_copy(this, &__p);
477            __ptr_ = __p.__ptr_;
478        }
479        return *this;
480    }
481
482#endif  // _LIBCPP_DEBUG_LEVEL >= 2
483    _LIBCPP_INLINE_VISIBILITY
484    reference operator*() const
485    {
486#if _LIBCPP_DEBUG_LEVEL >= 2
487        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
488                       "Attempted to dereference a non-dereferenceable list::const_iterator");
489#endif
490        return __ptr_->__as_node()->__value_;
491    }
492    _LIBCPP_INLINE_VISIBILITY
493    pointer operator->() const
494    {
495#if _LIBCPP_DEBUG_LEVEL >= 2
496        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
497                       "Attempted to dereference a non-dereferenceable list::const_iterator");
498#endif
499        return pointer_traits<pointer>::pointer_to(__ptr_->__as_node()->__value_);
500    }
501
502    _LIBCPP_INLINE_VISIBILITY
503    __list_const_iterator& operator++()
504    {
505#if _LIBCPP_DEBUG_LEVEL >= 2
506        _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
507                       "Attempted to increment non-incrementable list::const_iterator");
508#endif
509        __ptr_ = __ptr_->__next_;
510        return *this;
511    }
512    _LIBCPP_INLINE_VISIBILITY
513    __list_const_iterator operator++(int) {__list_const_iterator __t(*this); ++(*this); return __t;}
514
515    _LIBCPP_INLINE_VISIBILITY
516    __list_const_iterator& operator--()
517    {
518#if _LIBCPP_DEBUG_LEVEL >= 2
519        _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
520                       "Attempted to decrement non-decrementable list::const_iterator");
521#endif
522        __ptr_ = __ptr_->__prev_;
523        return *this;
524    }
525    _LIBCPP_INLINE_VISIBILITY
526    __list_const_iterator operator--(int) {__list_const_iterator __t(*this); --(*this); return __t;}
527
528    friend _LIBCPP_INLINE_VISIBILITY
529    bool operator==(const __list_const_iterator& __x, const __list_const_iterator& __y)
530    {
531        return __x.__ptr_ == __y.__ptr_;
532    }
533    friend _LIBCPP_INLINE_VISIBILITY
534    bool operator!=(const __list_const_iterator& __x, const __list_const_iterator& __y)
535        {return !(__x == __y);}
536};
537
538template <class _Tp, class _Alloc>
539class __list_imp
540{
541    __list_imp(const __list_imp&);
542    __list_imp& operator=(const __list_imp&);
543public:
544    typedef _Alloc                                                  allocator_type;
545    typedef allocator_traits<allocator_type>                        __alloc_traits;
546    typedef typename __alloc_traits::size_type                      size_type;
547protected:
548    typedef _Tp                                                     value_type;
549    typedef typename __alloc_traits::void_pointer                   __void_pointer;
550    typedef __list_iterator<value_type, __void_pointer>             iterator;
551    typedef __list_const_iterator<value_type, __void_pointer>       const_iterator;
552    typedef __list_node_base<value_type, __void_pointer>            __node_base;
553    typedef __list_node<value_type, __void_pointer>                 __node;
554    typedef typename __rebind_alloc_helper<__alloc_traits, __node>::type __node_allocator;
555    typedef allocator_traits<__node_allocator>                       __node_alloc_traits;
556    typedef typename __node_alloc_traits::pointer                    __node_pointer;
557    typedef typename __node_alloc_traits::pointer                    __node_const_pointer;
558    typedef __list_node_pointer_traits<value_type, __void_pointer> __node_pointer_traits;
559    typedef typename __node_pointer_traits::__link_pointer __link_pointer;
560    typedef __link_pointer __link_const_pointer;
561    typedef typename __alloc_traits::pointer                         pointer;
562    typedef typename __alloc_traits::const_pointer                   const_pointer;
563    typedef typename __alloc_traits::difference_type                 difference_type;
564
565    typedef typename __rebind_alloc_helper<__alloc_traits, __node_base>::type __node_base_allocator;
566    typedef typename allocator_traits<__node_base_allocator>::pointer __node_base_pointer;
567    static_assert((!is_same<allocator_type, __node_allocator>::value),
568                  "internal allocator type must differ from user-specified "
569                  "type; otherwise overload resolution breaks");
570
571    __node_base __end_;
572    __compressed_pair<size_type, __node_allocator> __size_alloc_;
573
574    _LIBCPP_INLINE_VISIBILITY
575    __link_pointer __end_as_link() const _NOEXCEPT {
576        return __node_pointer_traits::__unsafe_link_pointer_cast(
577                const_cast<__node_base&>(__end_).__self());
578    }
579
580    _LIBCPP_INLINE_VISIBILITY
581          size_type& __sz() _NOEXCEPT {return __size_alloc_.first();}
582    _LIBCPP_INLINE_VISIBILITY
583    const size_type& __sz() const _NOEXCEPT
584        {return __size_alloc_.first();}
585    _LIBCPP_INLINE_VISIBILITY
586          __node_allocator& __node_alloc() _NOEXCEPT
587          {return __size_alloc_.second();}
588    _LIBCPP_INLINE_VISIBILITY
589    const __node_allocator& __node_alloc() const _NOEXCEPT
590        {return __size_alloc_.second();}
591
592    _LIBCPP_INLINE_VISIBILITY
593    size_type __node_alloc_max_size() const _NOEXCEPT {
594        return __node_alloc_traits::max_size(__node_alloc());
595    }
596    _LIBCPP_INLINE_VISIBILITY
597    static void __unlink_nodes(__link_pointer __f, __link_pointer __l) _NOEXCEPT;
598
599    _LIBCPP_INLINE_VISIBILITY
600    __list_imp()
601        _NOEXCEPT_(is_nothrow_default_constructible<__node_allocator>::value);
602    _LIBCPP_INLINE_VISIBILITY
603    __list_imp(const allocator_type& __a);
604    _LIBCPP_INLINE_VISIBILITY
605    __list_imp(const __node_allocator& __a);
606#ifndef _LIBCPP_CXX03_LANG
607    __list_imp(__node_allocator&& __a) _NOEXCEPT;
608#endif
609    ~__list_imp();
610    void clear() _NOEXCEPT;
611    _LIBCPP_INLINE_VISIBILITY
612    bool empty() const _NOEXCEPT {return __sz() == 0;}
613
614    _LIBCPP_INLINE_VISIBILITY
615    iterator begin() _NOEXCEPT
616    {
617#if _LIBCPP_DEBUG_LEVEL >= 2
618        return iterator(__end_.__next_, this);
619#else
620        return iterator(__end_.__next_);
621#endif
622    }
623    _LIBCPP_INLINE_VISIBILITY
624    const_iterator begin() const  _NOEXCEPT
625    {
626#if _LIBCPP_DEBUG_LEVEL >= 2
627        return const_iterator(__end_.__next_, this);
628#else
629        return const_iterator(__end_.__next_);
630#endif
631    }
632    _LIBCPP_INLINE_VISIBILITY
633    iterator end() _NOEXCEPT
634    {
635#if _LIBCPP_DEBUG_LEVEL >= 2
636        return iterator(__end_as_link(), this);
637#else
638        return iterator(__end_as_link());
639#endif
640    }
641    _LIBCPP_INLINE_VISIBILITY
642    const_iterator end() const _NOEXCEPT
643    {
644#if _LIBCPP_DEBUG_LEVEL >= 2
645        return const_iterator(__end_as_link(), this);
646#else
647        return const_iterator(__end_as_link());
648#endif
649    }
650
651    void swap(__list_imp& __c)
652#if _LIBCPP_STD_VER >= 14
653        _NOEXCEPT;
654#else
655        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
656                    __is_nothrow_swappable<allocator_type>::value);
657#endif
658
659    _LIBCPP_INLINE_VISIBILITY
660    void __copy_assign_alloc(const __list_imp& __c)
661        {__copy_assign_alloc(__c, integral_constant<bool,
662                      __node_alloc_traits::propagate_on_container_copy_assignment::value>());}
663
664    _LIBCPP_INLINE_VISIBILITY
665    void __move_assign_alloc(__list_imp& __c)
666        _NOEXCEPT_(
667            !__node_alloc_traits::propagate_on_container_move_assignment::value ||
668            is_nothrow_move_assignable<__node_allocator>::value)
669        {__move_assign_alloc(__c, integral_constant<bool,
670                      __node_alloc_traits::propagate_on_container_move_assignment::value>());}
671
672private:
673    _LIBCPP_INLINE_VISIBILITY
674    void __copy_assign_alloc(const __list_imp& __c, true_type)
675        {
676            if (__node_alloc() != __c.__node_alloc())
677                clear();
678            __node_alloc() = __c.__node_alloc();
679        }
680
681    _LIBCPP_INLINE_VISIBILITY
682    void __copy_assign_alloc(const __list_imp&, false_type)
683        {}
684
685    _LIBCPP_INLINE_VISIBILITY
686    void __move_assign_alloc(__list_imp& __c, true_type)
687        _NOEXCEPT_(is_nothrow_move_assignable<__node_allocator>::value)
688        {
689            __node_alloc() = _VSTD::move(__c.__node_alloc());
690        }
691
692    _LIBCPP_INLINE_VISIBILITY
693    void __move_assign_alloc(__list_imp&, false_type)
694        _NOEXCEPT
695        {}
696
697    _LIBCPP_INLINE_VISIBILITY
698    void __invalidate_all_iterators() {
699#if _LIBCPP_DEBUG_LEVEL >= 2
700      __get_db()->__invalidate_all(this);
701#endif
702    }
703};
704
705// Unlink nodes [__f, __l]
706template <class _Tp, class _Alloc>
707inline
708void
709__list_imp<_Tp, _Alloc>::__unlink_nodes(__link_pointer __f, __link_pointer __l)
710    _NOEXCEPT
711{
712    __f->__prev_->__next_ = __l->__next_;
713    __l->__next_->__prev_ = __f->__prev_;
714}
715
716template <class _Tp, class _Alloc>
717inline
718__list_imp<_Tp, _Alloc>::__list_imp()
719        _NOEXCEPT_(is_nothrow_default_constructible<__node_allocator>::value)
720    : __size_alloc_(0, __default_init_tag())
721{
722}
723
724template <class _Tp, class _Alloc>
725inline
726__list_imp<_Tp, _Alloc>::__list_imp(const allocator_type& __a)
727    : __size_alloc_(0, __node_allocator(__a))
728{
729}
730
731template <class _Tp, class _Alloc>
732inline __list_imp<_Tp, _Alloc>::__list_imp(const __node_allocator& __a)
733    : __size_alloc_(0, __a) {}
734
735#ifndef _LIBCPP_CXX03_LANG
736template <class _Tp, class _Alloc>
737inline __list_imp<_Tp, _Alloc>::__list_imp(__node_allocator&& __a) _NOEXCEPT
738    : __size_alloc_(0, std::move(__a)) {}
739#endif
740
741template <class _Tp, class _Alloc>
742__list_imp<_Tp, _Alloc>::~__list_imp() {
743  clear();
744#if _LIBCPP_DEBUG_LEVEL >= 2
745    __get_db()->__erase_c(this);
746#endif
747}
748
749template <class _Tp, class _Alloc>
750void
751__list_imp<_Tp, _Alloc>::clear() _NOEXCEPT
752{
753    if (!empty())
754    {
755        __node_allocator& __na = __node_alloc();
756        __link_pointer __f = __end_.__next_;
757        __link_pointer __l = __end_as_link();
758        __unlink_nodes(__f, __l->__prev_);
759        __sz() = 0;
760        while (__f != __l)
761        {
762            __node_pointer __np = __f->__as_node();
763            __f = __f->__next_;
764            __node_alloc_traits::destroy(__na, _VSTD::addressof(__np->__value_));
765            __node_alloc_traits::deallocate(__na, __np, 1);
766        }
767        __invalidate_all_iterators();
768    }
769}
770
771template <class _Tp, class _Alloc>
772void
773__list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
774#if _LIBCPP_STD_VER >= 14
775        _NOEXCEPT
776#else
777        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
778                    __is_nothrow_swappable<allocator_type>::value)
779#endif
780{
781    _LIBCPP_ASSERT(__alloc_traits::propagate_on_container_swap::value ||
782                   this->__node_alloc() == __c.__node_alloc(),
783                   "list::swap: Either propagate_on_container_swap must be true"
784                   " or the allocators must compare equal");
785    using _VSTD::swap;
786    __swap_allocator(__node_alloc(), __c.__node_alloc());
787    swap(__sz(), __c.__sz());
788    swap(__end_, __c.__end_);
789    if (__sz() == 0)
790        __end_.__next_ = __end_.__prev_ = __end_as_link();
791    else
792        __end_.__prev_->__next_ = __end_.__next_->__prev_ = __end_as_link();
793    if (__c.__sz() == 0)
794        __c.__end_.__next_ = __c.__end_.__prev_ = __c.__end_as_link();
795    else
796        __c.__end_.__prev_->__next_ = __c.__end_.__next_->__prev_ = __c.__end_as_link();
797
798#if _LIBCPP_DEBUG_LEVEL >= 2
799    __libcpp_db* __db = __get_db();
800    __c_node* __cn1 = __db->__find_c_and_lock(this);
801    __c_node* __cn2 = __db->__find_c(&__c);
802    std::swap(__cn1->beg_, __cn2->beg_);
803    std::swap(__cn1->end_, __cn2->end_);
804    std::swap(__cn1->cap_, __cn2->cap_);
805    for (__i_node** __p = __cn1->end_; __p != __cn1->beg_;)
806    {
807        --__p;
808        const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
809        if (__i->__ptr_ == __c.__end_as_link())
810        {
811            __cn2->__add(*__p);
812            if (--__cn1->end_ != __p)
813                memmove(__p, __p+1, (__cn1->end_ - __p)*sizeof(__i_node*));
814        }
815        else
816            (*__p)->__c_ = __cn1;
817    }
818    for (__i_node** __p = __cn2->end_; __p != __cn2->beg_;)
819    {
820        --__p;
821        const_iterator* __i = static_cast<const_iterator*>((*__p)->__i_);
822        if (__i->__ptr_ == __end_as_link())
823        {
824            __cn1->__add(*__p);
825            if (--__cn2->end_ != __p)
826                memmove(__p, __p+1, (__cn2->end_ - __p)*sizeof(__i_node*));
827        }
828        else
829            (*__p)->__c_ = __cn2;
830    }
831    __db->unlock();
832#endif
833}
834
835template <class _Tp, class _Alloc /*= allocator<_Tp>*/>
836class _LIBCPP_TEMPLATE_VIS list
837    : private __list_imp<_Tp, _Alloc>
838{
839    typedef __list_imp<_Tp, _Alloc> base;
840    typedef typename base::__node              __node;
841    typedef typename base::__node_allocator    __node_allocator;
842    typedef typename base::__node_pointer      __node_pointer;
843    typedef typename base::__node_alloc_traits __node_alloc_traits;
844    typedef typename base::__node_base         __node_base;
845    typedef typename base::__node_base_pointer __node_base_pointer;
846    typedef typename base::__link_pointer __link_pointer;
847
848public:
849    typedef _Tp                                      value_type;
850    typedef _Alloc                                   allocator_type;
851    static_assert((is_same<value_type, typename allocator_type::value_type>::value),
852                  "Invalid allocator::value_type");
853    typedef value_type&                              reference;
854    typedef const value_type&                        const_reference;
855    typedef typename base::pointer                   pointer;
856    typedef typename base::const_pointer             const_pointer;
857    typedef typename base::size_type                 size_type;
858    typedef typename base::difference_type           difference_type;
859    typedef typename base::iterator                  iterator;
860    typedef typename base::const_iterator            const_iterator;
861    typedef _VSTD::reverse_iterator<iterator>         reverse_iterator;
862    typedef _VSTD::reverse_iterator<const_iterator>   const_reverse_iterator;
863#if _LIBCPP_STD_VER > 17
864    typedef size_type                                __remove_return_type;
865#else
866    typedef void                                     __remove_return_type;
867#endif
868
869    _LIBCPP_INLINE_VISIBILITY
870    list()
871        _NOEXCEPT_(is_nothrow_default_constructible<__node_allocator>::value)
872    {
873#if _LIBCPP_DEBUG_LEVEL >= 2
874        __get_db()->__insert_c(this);
875#endif
876    }
877    _LIBCPP_INLINE_VISIBILITY
878    explicit list(const allocator_type& __a) : base(__a)
879    {
880#if _LIBCPP_DEBUG_LEVEL >= 2
881        __get_db()->__insert_c(this);
882#endif
883    }
884    explicit list(size_type __n);
885#if _LIBCPP_STD_VER > 11
886    explicit list(size_type __n, const allocator_type& __a);
887#endif
888    list(size_type __n, const value_type& __x);
889    list(size_type __n, const value_type& __x, const allocator_type& __a);
890    template <class _InpIter>
891        list(_InpIter __f, _InpIter __l,
892             typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type* = 0);
893    template <class _InpIter>
894        list(_InpIter __f, _InpIter __l, const allocator_type& __a,
895             typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type* = 0);
896
897    list(const list& __c);
898    list(const list& __c, const allocator_type& __a);
899    _LIBCPP_INLINE_VISIBILITY
900    list& operator=(const list& __c);
901#ifndef _LIBCPP_CXX03_LANG
902    list(initializer_list<value_type> __il);
903    list(initializer_list<value_type> __il, const allocator_type& __a);
904
905    _LIBCPP_INLINE_VISIBILITY
906    list(list&& __c)
907        _NOEXCEPT_(is_nothrow_move_constructible<__node_allocator>::value);
908    _LIBCPP_INLINE_VISIBILITY
909    list(list&& __c, const allocator_type& __a);
910    _LIBCPP_INLINE_VISIBILITY
911    list& operator=(list&& __c)
912        _NOEXCEPT_(
913            __node_alloc_traits::propagate_on_container_move_assignment::value &&
914            is_nothrow_move_assignable<__node_allocator>::value);
915
916    _LIBCPP_INLINE_VISIBILITY
917    list& operator=(initializer_list<value_type> __il)
918        {assign(__il.begin(), __il.end()); return *this;}
919
920    _LIBCPP_INLINE_VISIBILITY
921    void assign(initializer_list<value_type> __il)
922        {assign(__il.begin(), __il.end());}
923#endif  // _LIBCPP_CXX03_LANG
924
925    template <class _InpIter>
926        void assign(_InpIter __f, _InpIter __l,
927             typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type* = 0);
928    void assign(size_type __n, const value_type& __x);
929
930    _LIBCPP_INLINE_VISIBILITY
931    allocator_type get_allocator() const _NOEXCEPT;
932
933    _LIBCPP_INLINE_VISIBILITY
934    size_type size() const _NOEXCEPT     {return base::__sz();}
935    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
936    bool empty() const _NOEXCEPT         {return base::empty();}
937    _LIBCPP_INLINE_VISIBILITY
938    size_type max_size() const _NOEXCEPT
939        {
940            return std::min<size_type>(
941                base::__node_alloc_max_size(),
942                numeric_limits<difference_type >::max());
943        }
944
945    _LIBCPP_INLINE_VISIBILITY
946          iterator begin() _NOEXCEPT        {return base::begin();}
947    _LIBCPP_INLINE_VISIBILITY
948    const_iterator begin()  const _NOEXCEPT {return base::begin();}
949    _LIBCPP_INLINE_VISIBILITY
950          iterator end() _NOEXCEPT          {return base::end();}
951    _LIBCPP_INLINE_VISIBILITY
952    const_iterator end()    const _NOEXCEPT {return base::end();}
953    _LIBCPP_INLINE_VISIBILITY
954    const_iterator cbegin() const _NOEXCEPT {return base::begin();}
955    _LIBCPP_INLINE_VISIBILITY
956    const_iterator cend()   const _NOEXCEPT {return base::end();}
957
958    _LIBCPP_INLINE_VISIBILITY
959          reverse_iterator rbegin() _NOEXCEPT
960            {return       reverse_iterator(end());}
961    _LIBCPP_INLINE_VISIBILITY
962    const_reverse_iterator rbegin()  const _NOEXCEPT
963        {return const_reverse_iterator(end());}
964    _LIBCPP_INLINE_VISIBILITY
965          reverse_iterator rend() _NOEXCEPT
966            {return       reverse_iterator(begin());}
967    _LIBCPP_INLINE_VISIBILITY
968    const_reverse_iterator rend()    const _NOEXCEPT
969        {return const_reverse_iterator(begin());}
970    _LIBCPP_INLINE_VISIBILITY
971    const_reverse_iterator crbegin() const _NOEXCEPT
972        {return const_reverse_iterator(end());}
973    _LIBCPP_INLINE_VISIBILITY
974    const_reverse_iterator crend()   const _NOEXCEPT
975        {return const_reverse_iterator(begin());}
976
977    _LIBCPP_INLINE_VISIBILITY
978    reference front()
979    {
980        _LIBCPP_ASSERT(!empty(), "list::front called on empty list");
981        return base::__end_.__next_->__as_node()->__value_;
982    }
983    _LIBCPP_INLINE_VISIBILITY
984    const_reference front() const
985    {
986        _LIBCPP_ASSERT(!empty(), "list::front called on empty list");
987        return base::__end_.__next_->__as_node()->__value_;
988    }
989    _LIBCPP_INLINE_VISIBILITY
990    reference back()
991    {
992        _LIBCPP_ASSERT(!empty(), "list::back called on empty list");
993        return base::__end_.__prev_->__as_node()->__value_;
994    }
995    _LIBCPP_INLINE_VISIBILITY
996    const_reference back() const
997    {
998        _LIBCPP_ASSERT(!empty(), "list::back called on empty list");
999        return base::__end_.__prev_->__as_node()->__value_;
1000    }
1001
1002#ifndef _LIBCPP_CXX03_LANG
1003    void push_front(value_type&& __x);
1004    void push_back(value_type&& __x);
1005
1006    template <class... _Args>
1007#if _LIBCPP_STD_VER > 14
1008       reference emplace_front(_Args&&... __args);
1009#else
1010       void      emplace_front(_Args&&... __args);
1011#endif
1012    template <class... _Args>
1013#if _LIBCPP_STD_VER > 14
1014        reference emplace_back(_Args&&... __args);
1015#else
1016       void       emplace_back(_Args&&... __args);
1017#endif
1018    template <class... _Args>
1019        iterator emplace(const_iterator __p, _Args&&... __args);
1020
1021    iterator insert(const_iterator __p, value_type&& __x);
1022
1023    _LIBCPP_INLINE_VISIBILITY
1024    iterator insert(const_iterator __p, initializer_list<value_type> __il)
1025        {return insert(__p, __il.begin(), __il.end());}
1026#endif  // _LIBCPP_CXX03_LANG
1027
1028    void push_front(const value_type& __x);
1029    void push_back(const value_type& __x);
1030
1031#ifndef _LIBCPP_CXX03_LANG
1032    template <class _Arg>
1033    _LIBCPP_INLINE_VISIBILITY
1034    void __emplace_back(_Arg&& __arg) { emplace_back(_VSTD::forward<_Arg>(__arg)); }
1035#else
1036    _LIBCPP_INLINE_VISIBILITY
1037    void __emplace_back(value_type const& __arg) { push_back(__arg); }
1038#endif
1039
1040    iterator insert(const_iterator __p, const value_type& __x);
1041    iterator insert(const_iterator __p, size_type __n, const value_type& __x);
1042    template <class _InpIter>
1043        iterator insert(const_iterator __p, _InpIter __f, _InpIter __l,
1044             typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type* = 0);
1045
1046    _LIBCPP_INLINE_VISIBILITY
1047    void swap(list& __c)
1048#if _LIBCPP_STD_VER >= 14
1049        _NOEXCEPT
1050#else
1051        _NOEXCEPT_(!__node_alloc_traits::propagate_on_container_swap::value ||
1052                   __is_nothrow_swappable<__node_allocator>::value)
1053#endif
1054        {base::swap(__c);}
1055    _LIBCPP_INLINE_VISIBILITY
1056    void clear() _NOEXCEPT {base::clear();}
1057
1058    void pop_front();
1059    void pop_back();
1060
1061    iterator erase(const_iterator __p);
1062    iterator erase(const_iterator __f, const_iterator __l);
1063
1064    void resize(size_type __n);
1065    void resize(size_type __n, const value_type& __x);
1066
1067    void splice(const_iterator __p, list& __c);
1068#ifndef _LIBCPP_CXX03_LANG
1069    _LIBCPP_INLINE_VISIBILITY
1070    void splice(const_iterator __p, list&& __c) {splice(__p, __c);}
1071    _LIBCPP_INLINE_VISIBILITY
1072    void splice(const_iterator __p, list&& __c, const_iterator __i)
1073        {splice(__p, __c, __i);}
1074    _LIBCPP_INLINE_VISIBILITY
1075    void splice(const_iterator __p, list&& __c, const_iterator __f, const_iterator __l)
1076        {splice(__p, __c, __f, __l);}
1077#endif
1078    void splice(const_iterator __p, list& __c, const_iterator __i);
1079    void splice(const_iterator __p, list& __c, const_iterator __f, const_iterator __l);
1080
1081    __remove_return_type remove(const value_type& __x);
1082    template <class _Pred> __remove_return_type remove_if(_Pred __pred);
1083    _LIBCPP_INLINE_VISIBILITY
1084    __remove_return_type unique() { return unique(__equal_to<value_type>()); }
1085    template <class _BinaryPred>
1086        __remove_return_type unique(_BinaryPred __binary_pred);
1087    _LIBCPP_INLINE_VISIBILITY
1088    void merge(list& __c);
1089#ifndef _LIBCPP_CXX03_LANG
1090    _LIBCPP_INLINE_VISIBILITY
1091    void merge(list&& __c) {merge(__c);}
1092
1093    template <class _Comp>
1094    _LIBCPP_INLINE_VISIBILITY
1095        void merge(list&& __c, _Comp __comp) {merge(__c, __comp);}
1096#endif
1097    template <class _Comp>
1098        void merge(list& __c, _Comp __comp);
1099
1100    _LIBCPP_INLINE_VISIBILITY
1101    void sort();
1102    template <class _Comp>
1103        _LIBCPP_INLINE_VISIBILITY
1104        void sort(_Comp __comp);
1105
1106    void reverse() _NOEXCEPT;
1107
1108    bool __invariants() const;
1109
1110    typedef __allocator_destructor<__node_allocator> __node_destructor;
1111    typedef unique_ptr<__node, __node_destructor> __hold_pointer;
1112
1113    _LIBCPP_INLINE_VISIBILITY
1114    __hold_pointer __allocate_node(__node_allocator& __na) {
1115      __node_pointer __p = __node_alloc_traits::allocate(__na, 1);
1116      __p->__prev_ = nullptr;
1117      return __hold_pointer(__p, __node_destructor(__na, 1));
1118    }
1119
1120#if _LIBCPP_DEBUG_LEVEL >= 2
1121
1122    bool __dereferenceable(const const_iterator* __i) const;
1123    bool __decrementable(const const_iterator* __i) const;
1124    bool __addable(const const_iterator* __i, ptrdiff_t __n) const;
1125    bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const;
1126
1127#endif  // _LIBCPP_DEBUG_LEVEL >= 2
1128
1129private:
1130    _LIBCPP_INLINE_VISIBILITY
1131    static void __link_nodes  (__link_pointer __p, __link_pointer __f, __link_pointer __l);
1132    _LIBCPP_INLINE_VISIBILITY
1133    void __link_nodes_at_front(__link_pointer __f, __link_pointer __l);
1134    _LIBCPP_INLINE_VISIBILITY
1135    void __link_nodes_at_back (__link_pointer __f, __link_pointer __l);
1136    iterator __iterator(size_type __n);
1137    template <class _Comp>
1138        static iterator __sort(iterator __f1, iterator __e2, size_type __n, _Comp& __comp);
1139
1140    void __move_assign(list& __c, true_type)
1141        _NOEXCEPT_(is_nothrow_move_assignable<__node_allocator>::value);
1142    void __move_assign(list& __c, false_type);
1143};
1144
1145#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES
1146template<class _InputIterator,
1147         class _Alloc = typename std::allocator<typename iterator_traits<_InputIterator>::value_type>,
1148         class = typename enable_if<__is_allocator<_Alloc>::value, void>::type
1149         >
1150list(_InputIterator, _InputIterator)
1151  -> list<typename iterator_traits<_InputIterator>::value_type, _Alloc>;
1152
1153template<class _InputIterator,
1154         class _Alloc,
1155         class = typename enable_if<__is_allocator<_Alloc>::value, void>::type
1156         >
1157list(_InputIterator, _InputIterator, _Alloc)
1158  -> list<typename iterator_traits<_InputIterator>::value_type, _Alloc>;
1159#endif
1160
1161// Link in nodes [__f, __l] just prior to __p
1162template <class _Tp, class _Alloc>
1163inline
1164void
1165list<_Tp, _Alloc>::__link_nodes(__link_pointer __p, __link_pointer __f, __link_pointer __l)
1166{
1167    __p->__prev_->__next_ = __f;
1168    __f->__prev_ = __p->__prev_;
1169    __p->__prev_ = __l;
1170    __l->__next_ = __p;
1171}
1172
1173// Link in nodes [__f, __l] at the front of the list
1174template <class _Tp, class _Alloc>
1175inline
1176void
1177list<_Tp, _Alloc>::__link_nodes_at_front(__link_pointer __f, __link_pointer __l)
1178{
1179    __f->__prev_ = base::__end_as_link();
1180    __l->__next_ = base::__end_.__next_;
1181    __l->__next_->__prev_ = __l;
1182    base::__end_.__next_ = __f;
1183}
1184
1185// Link in nodes [__f, __l] at the back of the list
1186template <class _Tp, class _Alloc>
1187inline
1188void
1189list<_Tp, _Alloc>::__link_nodes_at_back(__link_pointer __f, __link_pointer __l)
1190{
1191    __l->__next_ = base::__end_as_link();
1192    __f->__prev_ = base::__end_.__prev_;
1193    __f->__prev_->__next_ = __f;
1194    base::__end_.__prev_ = __l;
1195}
1196
1197
1198template <class _Tp, class _Alloc>
1199inline
1200typename list<_Tp, _Alloc>::iterator
1201list<_Tp, _Alloc>::__iterator(size_type __n)
1202{
1203    return __n <= base::__sz() / 2 ? _VSTD::next(begin(), __n)
1204                                   : _VSTD::prev(end(), base::__sz() - __n);
1205}
1206
1207template <class _Tp, class _Alloc>
1208list<_Tp, _Alloc>::list(size_type __n)
1209{
1210#if _LIBCPP_DEBUG_LEVEL >= 2
1211    __get_db()->__insert_c(this);
1212#endif
1213    for (; __n > 0; --__n)
1214#ifndef _LIBCPP_CXX03_LANG
1215        emplace_back();
1216#else
1217        push_back(value_type());
1218#endif
1219}
1220
1221#if _LIBCPP_STD_VER > 11
1222template <class _Tp, class _Alloc>
1223list<_Tp, _Alloc>::list(size_type __n, const allocator_type& __a) : base(__a)
1224{
1225#if _LIBCPP_DEBUG_LEVEL >= 2
1226    __get_db()->__insert_c(this);
1227#endif
1228    for (; __n > 0; --__n)
1229        emplace_back();
1230}
1231#endif
1232
1233template <class _Tp, class _Alloc>
1234list<_Tp, _Alloc>::list(size_type __n, const value_type& __x)
1235{
1236#if _LIBCPP_DEBUG_LEVEL >= 2
1237    __get_db()->__insert_c(this);
1238#endif
1239    for (; __n > 0; --__n)
1240        push_back(__x);
1241}
1242
1243template <class _Tp, class _Alloc>
1244list<_Tp, _Alloc>::list(size_type __n, const value_type& __x, const allocator_type& __a)
1245    : base(__a)
1246{
1247#if _LIBCPP_DEBUG_LEVEL >= 2
1248    __get_db()->__insert_c(this);
1249#endif
1250    for (; __n > 0; --__n)
1251        push_back(__x);
1252}
1253
1254template <class _Tp, class _Alloc>
1255template <class _InpIter>
1256list<_Tp, _Alloc>::list(_InpIter __f, _InpIter __l,
1257                        typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type*)
1258{
1259#if _LIBCPP_DEBUG_LEVEL >= 2
1260    __get_db()->__insert_c(this);
1261#endif
1262    for (; __f != __l; ++__f)
1263        __emplace_back(*__f);
1264}
1265
1266template <class _Tp, class _Alloc>
1267template <class _InpIter>
1268list<_Tp, _Alloc>::list(_InpIter __f, _InpIter __l, const allocator_type& __a,
1269                        typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type*)
1270    : base(__a)
1271{
1272#if _LIBCPP_DEBUG_LEVEL >= 2
1273    __get_db()->__insert_c(this);
1274#endif
1275    for (; __f != __l; ++__f)
1276        __emplace_back(*__f);
1277}
1278
1279template <class _Tp, class _Alloc>
1280list<_Tp, _Alloc>::list(const list& __c)
1281    : base(__node_alloc_traits::select_on_container_copy_construction(
1282          __c.__node_alloc())) {
1283#if _LIBCPP_DEBUG_LEVEL >= 2
1284    __get_db()->__insert_c(this);
1285#endif
1286    for (const_iterator __i = __c.begin(), __e = __c.end(); __i != __e; ++__i)
1287        push_back(*__i);
1288}
1289
1290template <class _Tp, class _Alloc>
1291list<_Tp, _Alloc>::list(const list& __c, const allocator_type& __a)
1292    : base(__a)
1293{
1294#if _LIBCPP_DEBUG_LEVEL >= 2
1295    __get_db()->__insert_c(this);
1296#endif
1297    for (const_iterator __i = __c.begin(), __e = __c.end(); __i != __e; ++__i)
1298        push_back(*__i);
1299}
1300
1301#ifndef _LIBCPP_CXX03_LANG
1302
1303template <class _Tp, class _Alloc>
1304list<_Tp, _Alloc>::list(initializer_list<value_type> __il, const allocator_type& __a)
1305    : base(__a)
1306{
1307#if _LIBCPP_DEBUG_LEVEL >= 2
1308    __get_db()->__insert_c(this);
1309#endif
1310    for (typename initializer_list<value_type>::const_iterator __i = __il.begin(),
1311            __e = __il.end(); __i != __e; ++__i)
1312        push_back(*__i);
1313}
1314
1315template <class _Tp, class _Alloc>
1316list<_Tp, _Alloc>::list(initializer_list<value_type> __il)
1317{
1318#if _LIBCPP_DEBUG_LEVEL >= 2
1319    __get_db()->__insert_c(this);
1320#endif
1321    for (typename initializer_list<value_type>::const_iterator __i = __il.begin(),
1322            __e = __il.end(); __i != __e; ++__i)
1323        push_back(*__i);
1324}
1325
1326template <class _Tp, class _Alloc>
1327inline list<_Tp, _Alloc>::list(list&& __c)
1328    _NOEXCEPT_(is_nothrow_move_constructible<__node_allocator>::value)
1329    : base(_VSTD::move(__c.__node_alloc())) {
1330#if _LIBCPP_DEBUG_LEVEL >= 2
1331    __get_db()->__insert_c(this);
1332#endif
1333    splice(end(), __c);
1334}
1335
1336template <class _Tp, class _Alloc>
1337inline
1338list<_Tp, _Alloc>::list(list&& __c, const allocator_type& __a)
1339    : base(__a)
1340{
1341#if _LIBCPP_DEBUG_LEVEL >= 2
1342    __get_db()->__insert_c(this);
1343#endif
1344    if (__a == __c.get_allocator())
1345        splice(end(), __c);
1346    else
1347    {
1348        typedef move_iterator<iterator> _Ip;
1349        assign(_Ip(__c.begin()), _Ip(__c.end()));
1350    }
1351}
1352
1353template <class _Tp, class _Alloc>
1354inline
1355list<_Tp, _Alloc>&
1356list<_Tp, _Alloc>::operator=(list&& __c)
1357        _NOEXCEPT_(
1358            __node_alloc_traits::propagate_on_container_move_assignment::value &&
1359            is_nothrow_move_assignable<__node_allocator>::value)
1360{
1361    __move_assign(__c, integral_constant<bool,
1362          __node_alloc_traits::propagate_on_container_move_assignment::value>());
1363    return *this;
1364}
1365
1366template <class _Tp, class _Alloc>
1367void
1368list<_Tp, _Alloc>::__move_assign(list& __c, false_type)
1369{
1370    if (base::__node_alloc() != __c.__node_alloc())
1371    {
1372        typedef move_iterator<iterator> _Ip;
1373        assign(_Ip(__c.begin()), _Ip(__c.end()));
1374    }
1375    else
1376        __move_assign(__c, true_type());
1377}
1378
1379template <class _Tp, class _Alloc>
1380void
1381list<_Tp, _Alloc>::__move_assign(list& __c, true_type)
1382        _NOEXCEPT_(is_nothrow_move_assignable<__node_allocator>::value)
1383{
1384    clear();
1385    base::__move_assign_alloc(__c);
1386    splice(end(), __c);
1387}
1388
1389#endif  // _LIBCPP_CXX03_LANG
1390
1391template <class _Tp, class _Alloc>
1392inline
1393list<_Tp, _Alloc>&
1394list<_Tp, _Alloc>::operator=(const list& __c)
1395{
1396    if (this != &__c)
1397    {
1398        base::__copy_assign_alloc(__c);
1399        assign(__c.begin(), __c.end());
1400    }
1401    return *this;
1402}
1403
1404template <class _Tp, class _Alloc>
1405template <class _InpIter>
1406void
1407list<_Tp, _Alloc>::assign(_InpIter __f, _InpIter __l,
1408                          typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type*)
1409{
1410    iterator __i = begin();
1411    iterator __e = end();
1412    for (; __f != __l && __i != __e; ++__f, ++__i)
1413        *__i = *__f;
1414    if (__i == __e)
1415        insert(__e, __f, __l);
1416    else
1417        erase(__i, __e);
1418#if _LIBCPP_DEBUG_LEVEL >= 2
1419      __get_db()->__invalidate_all(this);
1420#endif
1421}
1422
1423template <class _Tp, class _Alloc>
1424void
1425list<_Tp, _Alloc>::assign(size_type __n, const value_type& __x)
1426{
1427    iterator __i = begin();
1428    iterator __e = end();
1429    for (; __n > 0 && __i != __e; --__n, ++__i)
1430        *__i = __x;
1431    if (__i == __e)
1432        insert(__e, __n, __x);
1433    else
1434        erase(__i, __e);
1435#if _LIBCPP_DEBUG_LEVEL >= 2
1436      __get_db()->__invalidate_all(this);
1437#endif
1438}
1439
1440template <class _Tp, class _Alloc>
1441inline
1442_Alloc
1443list<_Tp, _Alloc>::get_allocator() const _NOEXCEPT
1444{
1445    return allocator_type(base::__node_alloc());
1446}
1447
1448template <class _Tp, class _Alloc>
1449typename list<_Tp, _Alloc>::iterator
1450list<_Tp, _Alloc>::insert(const_iterator __p, const value_type& __x)
1451{
1452#if _LIBCPP_DEBUG_LEVEL >= 2
1453    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1454        "list::insert(iterator, x) called with an iterator not"
1455        " referring to this list");
1456#endif
1457    __node_allocator& __na = base::__node_alloc();
1458    __hold_pointer __hold = __allocate_node(__na);
1459    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1460    __link_nodes(__p.__ptr_, __hold->__as_link(), __hold->__as_link());
1461    ++base::__sz();
1462#if _LIBCPP_DEBUG_LEVEL >= 2
1463    return iterator(__hold.release()->__as_link(), this);
1464#else
1465    return iterator(__hold.release()->__as_link());
1466#endif
1467}
1468
1469template <class _Tp, class _Alloc>
1470typename list<_Tp, _Alloc>::iterator
1471list<_Tp, _Alloc>::insert(const_iterator __p, size_type __n, const value_type& __x)
1472{
1473#if _LIBCPP_DEBUG_LEVEL >= 2
1474    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1475        "list::insert(iterator, n, x) called with an iterator not"
1476        " referring to this list");
1477    iterator __r(__p.__ptr_, this);
1478#else
1479    iterator __r(__p.__ptr_);
1480#endif
1481    if (__n > 0)
1482    {
1483        size_type __ds = 0;
1484        __node_allocator& __na = base::__node_alloc();
1485        __hold_pointer __hold = __allocate_node(__na);
1486        __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1487        ++__ds;
1488#if _LIBCPP_DEBUG_LEVEL >= 2
1489        __r = iterator(__hold->__as_link(), this);
1490#else
1491        __r = iterator(__hold->__as_link());
1492#endif
1493        __hold.release();
1494        iterator __e = __r;
1495#ifndef _LIBCPP_NO_EXCEPTIONS
1496        try
1497        {
1498#endif  // _LIBCPP_NO_EXCEPTIONS
1499            for (--__n; __n != 0; --__n, ++__e, ++__ds)
1500            {
1501                __hold.reset(__node_alloc_traits::allocate(__na, 1));
1502                __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1503                __e.__ptr_->__next_ = __hold->__as_link();
1504                __hold->__prev_ = __e.__ptr_;
1505                __hold.release();
1506            }
1507#ifndef _LIBCPP_NO_EXCEPTIONS
1508        }
1509        catch (...)
1510        {
1511            while (true)
1512            {
1513                __node_alloc_traits::destroy(__na, _VSTD::addressof(*__e));
1514                __link_pointer __prev = __e.__ptr_->__prev_;
1515                __node_alloc_traits::deallocate(__na, __e.__ptr_->__as_node(), 1);
1516                if (__prev == 0)
1517                    break;
1518#if _LIBCPP_DEBUG_LEVEL >= 2
1519                __e = iterator(__prev, this);
1520#else
1521                __e = iterator(__prev);
1522#endif
1523            }
1524            throw;
1525        }
1526#endif  // _LIBCPP_NO_EXCEPTIONS
1527        __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
1528        base::__sz() += __ds;
1529    }
1530    return __r;
1531}
1532
1533template <class _Tp, class _Alloc>
1534template <class _InpIter>
1535typename list<_Tp, _Alloc>::iterator
1536list<_Tp, _Alloc>::insert(const_iterator __p, _InpIter __f, _InpIter __l,
1537             typename enable_if<__is_cpp17_input_iterator<_InpIter>::value>::type*)
1538{
1539#if _LIBCPP_DEBUG_LEVEL >= 2
1540    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1541        "list::insert(iterator, range) called with an iterator not"
1542        " referring to this list");
1543    iterator __r(__p.__ptr_, this);
1544#else
1545    iterator __r(__p.__ptr_);
1546#endif
1547    if (__f != __l)
1548    {
1549        size_type __ds = 0;
1550        __node_allocator& __na = base::__node_alloc();
1551        __hold_pointer __hold = __allocate_node(__na);
1552        __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), *__f);
1553        ++__ds;
1554#if _LIBCPP_DEBUG_LEVEL >= 2
1555        __r = iterator(__hold.get()->__as_link(), this);
1556#else
1557        __r = iterator(__hold.get()->__as_link());
1558#endif
1559        __hold.release();
1560        iterator __e = __r;
1561#ifndef _LIBCPP_NO_EXCEPTIONS
1562        try
1563        {
1564#endif  // _LIBCPP_NO_EXCEPTIONS
1565            for (++__f; __f != __l; ++__f, (void) ++__e, (void) ++__ds)
1566            {
1567                __hold.reset(__node_alloc_traits::allocate(__na, 1));
1568                __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), *__f);
1569                __e.__ptr_->__next_ = __hold.get()->__as_link();
1570                __hold->__prev_ = __e.__ptr_;
1571                __hold.release();
1572            }
1573#ifndef _LIBCPP_NO_EXCEPTIONS
1574        }
1575        catch (...)
1576        {
1577            while (true)
1578            {
1579                __node_alloc_traits::destroy(__na, _VSTD::addressof(*__e));
1580                __link_pointer __prev = __e.__ptr_->__prev_;
1581                __node_alloc_traits::deallocate(__na, __e.__ptr_->__as_node(), 1);
1582                if (__prev == 0)
1583                    break;
1584#if _LIBCPP_DEBUG_LEVEL >= 2
1585                __e = iterator(__prev, this);
1586#else
1587                __e = iterator(__prev);
1588#endif
1589            }
1590            throw;
1591        }
1592#endif  // _LIBCPP_NO_EXCEPTIONS
1593        __link_nodes(__p.__ptr_, __r.__ptr_, __e.__ptr_);
1594        base::__sz() += __ds;
1595    }
1596    return __r;
1597}
1598
1599template <class _Tp, class _Alloc>
1600void
1601list<_Tp, _Alloc>::push_front(const value_type& __x)
1602{
1603    __node_allocator& __na = base::__node_alloc();
1604    __hold_pointer __hold = __allocate_node(__na);
1605    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1606    __link_pointer __nl = __hold->__as_link();
1607    __link_nodes_at_front(__nl, __nl);
1608    ++base::__sz();
1609    __hold.release();
1610}
1611
1612template <class _Tp, class _Alloc>
1613void
1614list<_Tp, _Alloc>::push_back(const value_type& __x)
1615{
1616    __node_allocator& __na = base::__node_alloc();
1617    __hold_pointer __hold = __allocate_node(__na);
1618    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1619    __link_nodes_at_back(__hold.get()->__as_link(), __hold.get()->__as_link());
1620    ++base::__sz();
1621    __hold.release();
1622}
1623
1624#ifndef _LIBCPP_CXX03_LANG
1625
1626template <class _Tp, class _Alloc>
1627void
1628list<_Tp, _Alloc>::push_front(value_type&& __x)
1629{
1630    __node_allocator& __na = base::__node_alloc();
1631    __hold_pointer __hold = __allocate_node(__na);
1632    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
1633    __link_nodes_at_front(__hold.get()->__as_link(), __hold.get()->__as_link());
1634    ++base::__sz();
1635    __hold.release();
1636}
1637
1638template <class _Tp, class _Alloc>
1639void
1640list<_Tp, _Alloc>::push_back(value_type&& __x)
1641{
1642    __node_allocator& __na = base::__node_alloc();
1643    __hold_pointer __hold = __allocate_node(__na);
1644    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
1645    __link_nodes_at_back(__hold.get()->__as_link(), __hold.get()->__as_link());
1646    ++base::__sz();
1647    __hold.release();
1648}
1649
1650template <class _Tp, class _Alloc>
1651template <class... _Args>
1652#if _LIBCPP_STD_VER > 14
1653typename list<_Tp, _Alloc>::reference
1654#else
1655void
1656#endif
1657list<_Tp, _Alloc>::emplace_front(_Args&&... __args)
1658{
1659    __node_allocator& __na = base::__node_alloc();
1660    __hold_pointer __hold = __allocate_node(__na);
1661    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
1662    __link_nodes_at_front(__hold.get()->__as_link(), __hold.get()->__as_link());
1663    ++base::__sz();
1664#if _LIBCPP_STD_VER > 14
1665    return __hold.release()->__value_;
1666#else
1667    __hold.release();
1668#endif
1669}
1670
1671template <class _Tp, class _Alloc>
1672template <class... _Args>
1673#if _LIBCPP_STD_VER > 14
1674typename list<_Tp, _Alloc>::reference
1675#else
1676void
1677#endif
1678list<_Tp, _Alloc>::emplace_back(_Args&&... __args)
1679{
1680    __node_allocator& __na = base::__node_alloc();
1681    __hold_pointer __hold = __allocate_node(__na);
1682    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
1683    __link_pointer __nl = __hold->__as_link();
1684    __link_nodes_at_back(__nl, __nl);
1685    ++base::__sz();
1686#if _LIBCPP_STD_VER > 14
1687    return __hold.release()->__value_;
1688#else
1689    __hold.release();
1690#endif
1691}
1692
1693template <class _Tp, class _Alloc>
1694template <class... _Args>
1695typename list<_Tp, _Alloc>::iterator
1696list<_Tp, _Alloc>::emplace(const_iterator __p, _Args&&... __args)
1697{
1698#if _LIBCPP_DEBUG_LEVEL >= 2
1699    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1700        "list::emplace(iterator, args...) called with an iterator not"
1701        " referring to this list");
1702#endif
1703    __node_allocator& __na = base::__node_alloc();
1704    __hold_pointer __hold = __allocate_node(__na);
1705    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::forward<_Args>(__args)...);
1706    __link_pointer __nl = __hold.get()->__as_link();
1707    __link_nodes(__p.__ptr_, __nl, __nl);
1708    ++base::__sz();
1709    __hold.release();
1710#if _LIBCPP_DEBUG_LEVEL >= 2
1711    return iterator(__nl, this);
1712#else
1713    return iterator(__nl);
1714#endif
1715}
1716
1717template <class _Tp, class _Alloc>
1718typename list<_Tp, _Alloc>::iterator
1719list<_Tp, _Alloc>::insert(const_iterator __p, value_type&& __x)
1720{
1721#if _LIBCPP_DEBUG_LEVEL >= 2
1722    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1723        "list::insert(iterator, x) called with an iterator not"
1724        " referring to this list");
1725#endif
1726    __node_allocator& __na = base::__node_alloc();
1727    __hold_pointer __hold = __allocate_node(__na);
1728    __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), _VSTD::move(__x));
1729    __link_pointer __nl = __hold->__as_link();
1730    __link_nodes(__p.__ptr_, __nl, __nl);
1731    ++base::__sz();
1732    __hold.release();
1733#if _LIBCPP_DEBUG_LEVEL >= 2
1734    return iterator(__nl, this);
1735#else
1736    return iterator(__nl);
1737#endif
1738}
1739
1740#endif  // _LIBCPP_CXX03_LANG
1741
1742template <class _Tp, class _Alloc>
1743void
1744list<_Tp, _Alloc>::pop_front()
1745{
1746    _LIBCPP_ASSERT(!empty(), "list::pop_front() called with empty list");
1747    __node_allocator& __na = base::__node_alloc();
1748    __link_pointer __n = base::__end_.__next_;
1749    base::__unlink_nodes(__n, __n);
1750    --base::__sz();
1751#if _LIBCPP_DEBUG_LEVEL >= 2
1752    __c_node* __c = __get_db()->__find_c_and_lock(this);
1753    for (__i_node** __p = __c->end_; __p != __c->beg_; )
1754    {
1755        --__p;
1756        iterator* __i = static_cast<iterator*>((*__p)->__i_);
1757        if (__i->__ptr_ == __n)
1758        {
1759            (*__p)->__c_ = nullptr;
1760            if (--__c->end_ != __p)
1761                memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
1762        }
1763    }
1764    __get_db()->unlock();
1765#endif
1766    __node_pointer __np = __n->__as_node();
1767    __node_alloc_traits::destroy(__na, _VSTD::addressof(__np->__value_));
1768    __node_alloc_traits::deallocate(__na, __np, 1);
1769}
1770
1771template <class _Tp, class _Alloc>
1772void
1773list<_Tp, _Alloc>::pop_back()
1774{
1775    _LIBCPP_ASSERT(!empty(), "list::pop_back() called with empty list");
1776    __node_allocator& __na = base::__node_alloc();
1777    __link_pointer __n = base::__end_.__prev_;
1778    base::__unlink_nodes(__n, __n);
1779    --base::__sz();
1780#if _LIBCPP_DEBUG_LEVEL >= 2
1781    __c_node* __c = __get_db()->__find_c_and_lock(this);
1782    for (__i_node** __p = __c->end_; __p != __c->beg_; )
1783    {
1784        --__p;
1785        iterator* __i = static_cast<iterator*>((*__p)->__i_);
1786        if (__i->__ptr_ == __n)
1787        {
1788            (*__p)->__c_ = nullptr;
1789            if (--__c->end_ != __p)
1790                memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
1791        }
1792    }
1793    __get_db()->unlock();
1794#endif
1795    __node_pointer __np = __n->__as_node();
1796    __node_alloc_traits::destroy(__na, _VSTD::addressof(__np->__value_));
1797    __node_alloc_traits::deallocate(__na, __np, 1);
1798}
1799
1800template <class _Tp, class _Alloc>
1801typename list<_Tp, _Alloc>::iterator
1802list<_Tp, _Alloc>::erase(const_iterator __p)
1803{
1804#if _LIBCPP_DEBUG_LEVEL >= 2
1805    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
1806        "list::erase(iterator) called with an iterator not"
1807        " referring to this list");
1808#endif
1809    _LIBCPP_ASSERT(__p != end(),
1810        "list::erase(iterator) called with a non-dereferenceable iterator");
1811    __node_allocator& __na = base::__node_alloc();
1812    __link_pointer __n = __p.__ptr_;
1813    __link_pointer __r = __n->__next_;
1814    base::__unlink_nodes(__n, __n);
1815    --base::__sz();
1816#if _LIBCPP_DEBUG_LEVEL >= 2
1817    __c_node* __c = __get_db()->__find_c_and_lock(this);
1818    for (__i_node** __ip = __c->end_; __ip != __c->beg_; )
1819    {
1820        --__ip;
1821        iterator* __i = static_cast<iterator*>((*__ip)->__i_);
1822        if (__i->__ptr_ == __n)
1823        {
1824            (*__ip)->__c_ = nullptr;
1825            if (--__c->end_ != __ip)
1826                memmove(__ip, __ip+1, (__c->end_ - __ip)*sizeof(__i_node*));
1827        }
1828    }
1829    __get_db()->unlock();
1830#endif
1831    __node_pointer __np = __n->__as_node();
1832    __node_alloc_traits::destroy(__na, _VSTD::addressof(__np->__value_));
1833    __node_alloc_traits::deallocate(__na, __np, 1);
1834#if _LIBCPP_DEBUG_LEVEL >= 2
1835    return iterator(__r, this);
1836#else
1837    return iterator(__r);
1838#endif
1839}
1840
1841template <class _Tp, class _Alloc>
1842typename list<_Tp, _Alloc>::iterator
1843list<_Tp, _Alloc>::erase(const_iterator __f, const_iterator __l)
1844{
1845#if _LIBCPP_DEBUG_LEVEL >= 2
1846    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__f) == this,
1847        "list::erase(iterator, iterator) called with an iterator not"
1848        " referring to this list");
1849   _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__l) == this,
1850        "list::erase(iterator, iterator) called with an iterator not"
1851        " referring to this list");
1852#endif
1853    if (__f != __l)
1854    {
1855        __node_allocator& __na = base::__node_alloc();
1856        base::__unlink_nodes(__f.__ptr_, __l.__ptr_->__prev_);
1857        while (__f != __l)
1858        {
1859            __link_pointer __n = __f.__ptr_;
1860            ++__f;
1861            --base::__sz();
1862#if _LIBCPP_DEBUG_LEVEL >= 2
1863            __c_node* __c = __get_db()->__find_c_and_lock(this);
1864            for (__i_node** __p = __c->end_; __p != __c->beg_; )
1865            {
1866                --__p;
1867                iterator* __i = static_cast<iterator*>((*__p)->__i_);
1868                if (__i->__ptr_ == __n)
1869                {
1870                    (*__p)->__c_ = nullptr;
1871                    if (--__c->end_ != __p)
1872                        memmove(__p, __p+1, (__c->end_ - __p)*sizeof(__i_node*));
1873                }
1874            }
1875            __get_db()->unlock();
1876#endif
1877            __node_pointer __np = __n->__as_node();
1878            __node_alloc_traits::destroy(__na, _VSTD::addressof(__np->__value_));
1879            __node_alloc_traits::deallocate(__na, __np, 1);
1880        }
1881    }
1882#if _LIBCPP_DEBUG_LEVEL >= 2
1883    return iterator(__l.__ptr_, this);
1884#else
1885    return iterator(__l.__ptr_);
1886#endif
1887}
1888
1889template <class _Tp, class _Alloc>
1890void
1891list<_Tp, _Alloc>::resize(size_type __n)
1892{
1893    if (__n < base::__sz())
1894        erase(__iterator(__n), end());
1895    else if (__n > base::__sz())
1896    {
1897        __n -= base::__sz();
1898        size_type __ds = 0;
1899        __node_allocator& __na = base::__node_alloc();
1900        __hold_pointer __hold = __allocate_node(__na);
1901        __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_));
1902        ++__ds;
1903#if _LIBCPP_DEBUG_LEVEL >= 2
1904        iterator __r = iterator(__hold.release()->__as_link(), this);
1905#else
1906        iterator __r = iterator(__hold.release()->__as_link());
1907#endif
1908        iterator __e = __r;
1909#ifndef _LIBCPP_NO_EXCEPTIONS
1910        try
1911        {
1912#endif  // _LIBCPP_NO_EXCEPTIONS
1913            for (--__n; __n != 0; --__n, ++__e, ++__ds)
1914            {
1915                __hold.reset(__node_alloc_traits::allocate(__na, 1));
1916                __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_));
1917                __e.__ptr_->__next_ = __hold.get()->__as_link();
1918                __hold->__prev_ = __e.__ptr_;
1919                __hold.release();
1920            }
1921#ifndef _LIBCPP_NO_EXCEPTIONS
1922        }
1923        catch (...)
1924        {
1925            while (true)
1926            {
1927                __node_alloc_traits::destroy(__na, _VSTD::addressof(*__e));
1928                __link_pointer __prev = __e.__ptr_->__prev_;
1929                __node_alloc_traits::deallocate(__na, __e.__ptr_->__as_node(), 1);
1930                if (__prev == 0)
1931                    break;
1932#if _LIBCPP_DEBUG_LEVEL >= 2
1933                __e = iterator(__prev, this);
1934#else
1935                __e = iterator(__prev);
1936#endif
1937            }
1938            throw;
1939        }
1940#endif  // _LIBCPP_NO_EXCEPTIONS
1941        __link_nodes_at_back(__r.__ptr_, __e.__ptr_);
1942        base::__sz() += __ds;
1943    }
1944}
1945
1946template <class _Tp, class _Alloc>
1947void
1948list<_Tp, _Alloc>::resize(size_type __n, const value_type& __x)
1949{
1950    if (__n < base::__sz())
1951        erase(__iterator(__n), end());
1952    else if (__n > base::__sz())
1953    {
1954        __n -= base::__sz();
1955        size_type __ds = 0;
1956        __node_allocator& __na = base::__node_alloc();
1957        __hold_pointer __hold = __allocate_node(__na);
1958        __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1959        ++__ds;
1960        __link_pointer __nl = __hold.release()->__as_link();
1961#if _LIBCPP_DEBUG_LEVEL >= 2
1962        iterator __r = iterator(__nl, this);
1963#else
1964        iterator __r = iterator(__nl);
1965#endif
1966        iterator __e = __r;
1967#ifndef _LIBCPP_NO_EXCEPTIONS
1968        try
1969        {
1970#endif  // _LIBCPP_NO_EXCEPTIONS
1971            for (--__n; __n != 0; --__n, ++__e, ++__ds)
1972            {
1973                __hold.reset(__node_alloc_traits::allocate(__na, 1));
1974                __node_alloc_traits::construct(__na, _VSTD::addressof(__hold->__value_), __x);
1975                __e.__ptr_->__next_ = __hold.get()->__as_link();
1976                __hold->__prev_ = __e.__ptr_;
1977                __hold.release();
1978            }
1979#ifndef _LIBCPP_NO_EXCEPTIONS
1980        }
1981        catch (...)
1982        {
1983            while (true)
1984            {
1985                __node_alloc_traits::destroy(__na, _VSTD::addressof(*__e));
1986                __link_pointer __prev = __e.__ptr_->__prev_;
1987                __node_alloc_traits::deallocate(__na, __e.__ptr_->__as_node(), 1);
1988                if (__prev == 0)
1989                    break;
1990#if _LIBCPP_DEBUG_LEVEL >= 2
1991                __e = iterator(__prev, this);
1992#else
1993                __e = iterator(__prev);
1994#endif
1995            }
1996            throw;
1997        }
1998#endif  // _LIBCPP_NO_EXCEPTIONS
1999        __link_nodes(base::__end_as_link(), __r.__ptr_, __e.__ptr_);
2000        base::__sz() += __ds;
2001    }
2002}
2003
2004template <class _Tp, class _Alloc>
2005void
2006list<_Tp, _Alloc>::splice(const_iterator __p, list& __c)
2007{
2008    _LIBCPP_ASSERT(this != &__c,
2009                   "list::splice(iterator, list) called with this == &list");
2010#if _LIBCPP_DEBUG_LEVEL >= 2
2011    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
2012        "list::splice(iterator, list) called with an iterator not"
2013        " referring to this list");
2014#endif
2015    if (!__c.empty())
2016    {
2017        __link_pointer __f = __c.__end_.__next_;
2018        __link_pointer __l = __c.__end_.__prev_;
2019        base::__unlink_nodes(__f, __l);
2020        __link_nodes(__p.__ptr_, __f, __l);
2021        base::__sz() += __c.__sz();
2022        __c.__sz() = 0;
2023#if _LIBCPP_DEBUG_LEVEL >= 2
2024        if (&__c != this) {
2025            __libcpp_db* __db = __get_db();
2026            __c_node* __cn1 = __db->__find_c_and_lock(this);
2027            __c_node* __cn2 = __db->__find_c(&__c);
2028            for (__i_node** __ip = __cn2->end_; __ip != __cn2->beg_;)
2029            {
2030                --__ip;
2031                iterator* __i = static_cast<iterator*>((*__ip)->__i_);
2032                if (__i->__ptr_ != __c.__end_as_link())
2033                {
2034                    __cn1->__add(*__ip);
2035                    (*__ip)->__c_ = __cn1;
2036                    if (--__cn2->end_ != __ip)
2037                        memmove(__ip, __ip+1, (__cn2->end_ - __ip)*sizeof(__i_node*));
2038                }
2039            }
2040            __db->unlock();
2041        }
2042#endif
2043    }
2044}
2045
2046template <class _Tp, class _Alloc>
2047void
2048list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __i)
2049{
2050#if _LIBCPP_DEBUG_LEVEL >= 2
2051    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
2052        "list::splice(iterator, list, iterator) called with first iterator not"
2053        " referring to this list");
2054    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__i) == &__c,
2055        "list::splice(iterator, list, iterator) called with second iterator not"
2056        " referring to list argument");
2057    _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(&__i),
2058        "list::splice(iterator, list, iterator) called with second iterator not"
2059        " derefereceable");
2060#endif
2061    if (__p.__ptr_ != __i.__ptr_ && __p.__ptr_ != __i.__ptr_->__next_)
2062    {
2063        __link_pointer __f = __i.__ptr_;
2064        base::__unlink_nodes(__f, __f);
2065        __link_nodes(__p.__ptr_, __f, __f);
2066        --__c.__sz();
2067        ++base::__sz();
2068#if _LIBCPP_DEBUG_LEVEL >= 2
2069        if (&__c != this) {
2070            __libcpp_db* __db = __get_db();
2071            __c_node* __cn1 = __db->__find_c_and_lock(this);
2072            __c_node* __cn2 = __db->__find_c(&__c);
2073            for (__i_node** __ip = __cn2->end_; __ip != __cn2->beg_;)
2074            {
2075                --__ip;
2076                iterator* __j = static_cast<iterator*>((*__ip)->__i_);
2077                if (__j->__ptr_ == __f)
2078                {
2079                    __cn1->__add(*__ip);
2080                    (*__ip)->__c_ = __cn1;
2081                    if (--__cn2->end_ != __ip)
2082                        memmove(__ip, __ip+1, (__cn2->end_ - __ip)*sizeof(__i_node*));
2083                }
2084            }
2085            __db->unlock();
2086        }
2087#endif
2088    }
2089}
2090
2091template <class _Tp, class _Alloc>
2092void
2093list<_Tp, _Alloc>::splice(const_iterator __p, list& __c, const_iterator __f, const_iterator __l)
2094{
2095#if _LIBCPP_DEBUG_LEVEL >= 2
2096    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
2097        "list::splice(iterator, list, iterator, iterator) called with first iterator not"
2098        " referring to this list");
2099    _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__f) == &__c,
2100        "list::splice(iterator, list, iterator, iterator) called with second iterator not"
2101        " referring to list argument");
2102    if (this == &__c)
2103    {
2104        for (const_iterator __i = __f; __i != __l; ++__i)
2105            _LIBCPP_ASSERT(__i != __p,
2106                           "list::splice(iterator, list, iterator, iterator)"
2107                           " called with the first iterator within the range"
2108                           " of the second and third iterators");
2109    }
2110#endif
2111    if (__f != __l)
2112    {
2113        __link_pointer __first = __f.__ptr_;
2114        --__l;
2115        __link_pointer __last = __l.__ptr_;
2116        if (this != &__c)
2117        {
2118            size_type __s = _VSTD::distance(__f, __l) + 1;
2119            __c.__sz() -= __s;
2120            base::__sz() += __s;
2121        }
2122        base::__unlink_nodes(__first, __last);
2123        __link_nodes(__p.__ptr_, __first, __last);
2124#if _LIBCPP_DEBUG_LEVEL >= 2
2125        if (&__c != this) {
2126            __libcpp_db* __db = __get_db();
2127            __c_node* __cn1 = __db->__find_c_and_lock(this);
2128            __c_node* __cn2 = __db->__find_c(&__c);
2129            for (__i_node** __ip = __cn2->end_; __ip != __cn2->beg_;)
2130            {
2131                --__ip;
2132                iterator* __j = static_cast<iterator*>((*__ip)->__i_);
2133                for (__link_pointer __k = __f.__ptr_;
2134                                              __k != __l.__ptr_; __k = __k->__next_)
2135                {
2136                    if (__j->__ptr_ == __k)
2137                    {
2138                        __cn1->__add(*__ip);
2139                        (*__ip)->__c_ = __cn1;
2140                        if (--__cn2->end_ != __ip)
2141                            memmove(__ip, __ip+1, (__cn2->end_ - __ip)*sizeof(__i_node*));
2142                    }
2143                }
2144            }
2145            __db->unlock();
2146        }
2147#endif
2148    }
2149}
2150
2151template <class _Tp, class _Alloc>
2152typename list<_Tp, _Alloc>::__remove_return_type
2153list<_Tp, _Alloc>::remove(const value_type& __x)
2154{
2155    list<_Tp, _Alloc> __deleted_nodes(get_allocator()); // collect the nodes we're removing
2156    for (const_iterator __i = begin(), __e = end(); __i != __e;)
2157    {
2158        if (*__i == __x)
2159        {
2160            const_iterator __j = _VSTD::next(__i);
2161            for (; __j != __e && *__j == __x; ++__j)
2162                ;
2163            __deleted_nodes.splice(__deleted_nodes.end(), *this, __i, __j);
2164            __i = __j;
2165            if (__i != __e)
2166                ++__i;
2167        }
2168        else
2169            ++__i;
2170    }
2171
2172    return (__remove_return_type) __deleted_nodes.size();
2173}
2174
2175template <class _Tp, class _Alloc>
2176template <class _Pred>
2177typename list<_Tp, _Alloc>::__remove_return_type
2178list<_Tp, _Alloc>::remove_if(_Pred __pred)
2179{
2180    list<_Tp, _Alloc> __deleted_nodes(get_allocator()); // collect the nodes we're removing
2181    for (iterator __i = begin(), __e = end(); __i != __e;)
2182    {
2183        if (__pred(*__i))
2184        {
2185            iterator __j = _VSTD::next(__i);
2186            for (; __j != __e && __pred(*__j); ++__j)
2187                ;
2188            __deleted_nodes.splice(__deleted_nodes.end(), *this, __i, __j);
2189            __i = __j;
2190            if (__i != __e)
2191                ++__i;
2192        }
2193        else
2194            ++__i;
2195    }
2196
2197    return (__remove_return_type) __deleted_nodes.size();
2198}
2199
2200template <class _Tp, class _Alloc>
2201template <class _BinaryPred>
2202typename list<_Tp, _Alloc>::__remove_return_type
2203list<_Tp, _Alloc>::unique(_BinaryPred __binary_pred)
2204{
2205    list<_Tp, _Alloc> __deleted_nodes(get_allocator()); // collect the nodes we're removing
2206    for (iterator __i = begin(), __e = end(); __i != __e;)
2207    {
2208        iterator __j = _VSTD::next(__i);
2209        for (; __j != __e && __binary_pred(*__i, *__j); ++__j)
2210            ;
2211        if (++__i != __j) {
2212            __deleted_nodes.splice(__deleted_nodes.end(), *this, __i, __j);
2213            __i = __j;
2214            }
2215    }
2216
2217    return (__remove_return_type) __deleted_nodes.size();
2218}
2219
2220template <class _Tp, class _Alloc>
2221inline
2222void
2223list<_Tp, _Alloc>::merge(list& __c)
2224{
2225    merge(__c, __less<value_type>());
2226}
2227
2228template <class _Tp, class _Alloc>
2229template <class _Comp>
2230void
2231list<_Tp, _Alloc>::merge(list& __c, _Comp __comp)
2232{
2233    if (this != _VSTD::addressof(__c))
2234    {
2235        iterator __f1 = begin();
2236        iterator __e1 = end();
2237        iterator __f2 = __c.begin();
2238        iterator __e2 = __c.end();
2239        while (__f1 != __e1 && __f2 != __e2)
2240        {
2241            if (__comp(*__f2, *__f1))
2242            {
2243                size_type __ds = 1;
2244                iterator __m2 = _VSTD::next(__f2);
2245                for (; __m2 != __e2 && __comp(*__m2, *__f1); ++__m2, ++__ds)
2246                    ;
2247                base::__sz() += __ds;
2248                __c.__sz() -= __ds;
2249                __link_pointer __f = __f2.__ptr_;
2250                __link_pointer __l = __m2.__ptr_->__prev_;
2251                __f2 = __m2;
2252                base::__unlink_nodes(__f, __l);
2253                __m2 = _VSTD::next(__f1);
2254                __link_nodes(__f1.__ptr_, __f, __l);
2255                __f1 = __m2;
2256            }
2257            else
2258                ++__f1;
2259        }
2260        splice(__e1, __c);
2261#if _LIBCPP_DEBUG_LEVEL >= 2
2262        __libcpp_db* __db = __get_db();
2263        __c_node* __cn1 = __db->__find_c_and_lock(this);
2264        __c_node* __cn2 = __db->__find_c(&__c);
2265        for (__i_node** __p = __cn2->end_; __p != __cn2->beg_;)
2266        {
2267            --__p;
2268            iterator* __i = static_cast<iterator*>((*__p)->__i_);
2269            if (__i->__ptr_ != __c.__end_as_link())
2270            {
2271                __cn1->__add(*__p);
2272                (*__p)->__c_ = __cn1;
2273                if (--__cn2->end_ != __p)
2274                    memmove(__p, __p+1, (__cn2->end_ - __p)*sizeof(__i_node*));
2275            }
2276        }
2277        __db->unlock();
2278#endif
2279    }
2280}
2281
2282template <class _Tp, class _Alloc>
2283inline
2284void
2285list<_Tp, _Alloc>::sort()
2286{
2287    sort(__less<value_type>());
2288}
2289
2290template <class _Tp, class _Alloc>
2291template <class _Comp>
2292inline
2293void
2294list<_Tp, _Alloc>::sort(_Comp __comp)
2295{
2296    __sort(begin(), end(), base::__sz(), __comp);
2297}
2298
2299template <class _Tp, class _Alloc>
2300template <class _Comp>
2301typename list<_Tp, _Alloc>::iterator
2302list<_Tp, _Alloc>::__sort(iterator __f1, iterator __e2, size_type __n, _Comp& __comp)
2303{
2304    switch (__n)
2305    {
2306    case 0:
2307    case 1:
2308        return __f1;
2309    case 2:
2310        if (__comp(*--__e2, *__f1))
2311        {
2312            __link_pointer __f = __e2.__ptr_;
2313            base::__unlink_nodes(__f, __f);
2314            __link_nodes(__f1.__ptr_, __f, __f);
2315            return __e2;
2316        }
2317        return __f1;
2318    }
2319    size_type __n2 = __n / 2;
2320    iterator __e1 = _VSTD::next(__f1, __n2);
2321    iterator  __r = __f1 = __sort(__f1, __e1, __n2, __comp);
2322    iterator __f2 = __e1 = __sort(__e1, __e2, __n - __n2, __comp);
2323    if (__comp(*__f2, *__f1))
2324    {
2325        iterator __m2 = _VSTD::next(__f2);
2326        for (; __m2 != __e2 && __comp(*__m2, *__f1); ++__m2)
2327            ;
2328        __link_pointer __f = __f2.__ptr_;
2329        __link_pointer __l = __m2.__ptr_->__prev_;
2330        __r = __f2;
2331        __e1 = __f2 = __m2;
2332        base::__unlink_nodes(__f, __l);
2333        __m2 = _VSTD::next(__f1);
2334        __link_nodes(__f1.__ptr_, __f, __l);
2335        __f1 = __m2;
2336    }
2337    else
2338        ++__f1;
2339    while (__f1 != __e1 && __f2 != __e2)
2340    {
2341        if (__comp(*__f2, *__f1))
2342        {
2343            iterator __m2 = _VSTD::next(__f2);
2344            for (; __m2 != __e2 && __comp(*__m2, *__f1); ++__m2)
2345                ;
2346            __link_pointer __f = __f2.__ptr_;
2347            __link_pointer __l = __m2.__ptr_->__prev_;
2348            if (__e1 == __f2)
2349                __e1 = __m2;
2350            __f2 = __m2;
2351            base::__unlink_nodes(__f, __l);
2352            __m2 = _VSTD::next(__f1);
2353            __link_nodes(__f1.__ptr_, __f, __l);
2354            __f1 = __m2;
2355        }
2356        else
2357            ++__f1;
2358    }
2359    return __r;
2360}
2361
2362template <class _Tp, class _Alloc>
2363void
2364list<_Tp, _Alloc>::reverse() _NOEXCEPT
2365{
2366    if (base::__sz() > 1)
2367    {
2368        iterator __e = end();
2369        for (iterator __i = begin(); __i.__ptr_ != __e.__ptr_;)
2370        {
2371            _VSTD::swap(__i.__ptr_->__prev_, __i.__ptr_->__next_);
2372            __i.__ptr_ = __i.__ptr_->__prev_;
2373        }
2374        _VSTD::swap(__e.__ptr_->__prev_, __e.__ptr_->__next_);
2375    }
2376}
2377
2378template <class _Tp, class _Alloc>
2379bool
2380list<_Tp, _Alloc>::__invariants() const
2381{
2382    return size() == _VSTD::distance(begin(), end());
2383}
2384
2385#if _LIBCPP_DEBUG_LEVEL >= 2
2386
2387template <class _Tp, class _Alloc>
2388bool
2389list<_Tp, _Alloc>::__dereferenceable(const const_iterator* __i) const
2390{
2391    return __i->__ptr_ != this->__end_as_link();
2392}
2393
2394template <class _Tp, class _Alloc>
2395bool
2396list<_Tp, _Alloc>::__decrementable(const const_iterator* __i) const
2397{
2398    return !empty() &&  __i->__ptr_ != base::__end_.__next_;
2399}
2400
2401template <class _Tp, class _Alloc>
2402bool
2403list<_Tp, _Alloc>::__addable(const const_iterator*, ptrdiff_t) const
2404{
2405    return false;
2406}
2407
2408template <class _Tp, class _Alloc>
2409bool
2410list<_Tp, _Alloc>::__subscriptable(const const_iterator*, ptrdiff_t) const
2411{
2412    return false;
2413}
2414
2415#endif  // _LIBCPP_DEBUG_LEVEL >= 2
2416
2417template <class _Tp, class _Alloc>
2418inline _LIBCPP_INLINE_VISIBILITY
2419bool
2420operator==(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2421{
2422    return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
2423}
2424
2425template <class _Tp, class _Alloc>
2426inline _LIBCPP_INLINE_VISIBILITY
2427bool
2428operator< (const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2429{
2430    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
2431}
2432
2433template <class _Tp, class _Alloc>
2434inline _LIBCPP_INLINE_VISIBILITY
2435bool
2436operator!=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2437{
2438    return !(__x == __y);
2439}
2440
2441template <class _Tp, class _Alloc>
2442inline _LIBCPP_INLINE_VISIBILITY
2443bool
2444operator> (const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2445{
2446    return __y < __x;
2447}
2448
2449template <class _Tp, class _Alloc>
2450inline _LIBCPP_INLINE_VISIBILITY
2451bool
2452operator>=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2453{
2454    return !(__x < __y);
2455}
2456
2457template <class _Tp, class _Alloc>
2458inline _LIBCPP_INLINE_VISIBILITY
2459bool
2460operator<=(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
2461{
2462    return !(__y < __x);
2463}
2464
2465template <class _Tp, class _Alloc>
2466inline _LIBCPP_INLINE_VISIBILITY
2467void
2468swap(list<_Tp, _Alloc>& __x, list<_Tp, _Alloc>& __y)
2469    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
2470{
2471    __x.swap(__y);
2472}
2473
2474#if _LIBCPP_STD_VER > 17
2475template <class _Tp, class _Allocator, class _Predicate>
2476inline _LIBCPP_INLINE_VISIBILITY typename list<_Tp, _Allocator>::size_type
2477erase_if(list<_Tp, _Allocator>& __c, _Predicate __pred) {
2478  return __c.remove_if(__pred);
2479}
2480
2481template <class _Tp, class _Allocator, class _Up>
2482inline _LIBCPP_INLINE_VISIBILITY typename list<_Tp, _Allocator>::size_type
2483erase(list<_Tp, _Allocator>& __c, const _Up& __v) {
2484  return _VSTD::erase_if(__c, [&](auto& __elem) { return __elem == __v; });
2485}
2486#endif
2487
2488_LIBCPP_END_NAMESPACE_STD
2489
2490_LIBCPP_POP_MACROS
2491
2492#endif  // _LIBCPP_LIST
2493