1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
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_MAP
11#define _LIBCPP_MAP
12
13/*
14
15    map synopsis
16
17namespace std
18{
19
20template <class Key, class T, class Compare = less<Key>,
21          class Allocator = allocator<pair<const Key, T>>>
22class map
23{
24public:
25    // types:
26    typedef Key                                      key_type;
27    typedef T                                        mapped_type;
28    typedef pair<const key_type, mapped_type>        value_type;
29    typedef Compare                                  key_compare;
30    typedef Allocator                                allocator_type;
31    typedef typename allocator_type::reference       reference;
32    typedef typename allocator_type::const_reference const_reference;
33    typedef typename allocator_type::pointer         pointer;
34    typedef typename allocator_type::const_pointer   const_pointer;
35    typedef typename allocator_type::size_type       size_type;
36    typedef typename allocator_type::difference_type difference_type;
37
38    typedef implementation-defined                   iterator;
39    typedef implementation-defined                   const_iterator;
40    typedef std::reverse_iterator<iterator>          reverse_iterator;
41    typedef std::reverse_iterator<const_iterator>    const_reverse_iterator;
42    typedef unspecified                              node_type;              // C++17
43    typedef INSERT_RETURN_TYPE<iterator, node_type>  insert_return_type;     // C++17
44
45    class value_compare
46    {
47        friend class map;
48    protected:
49        key_compare comp;
50
51        value_compare(key_compare c);
52    public:
53        typedef bool result_type;  // deprecated in C++17, removed in C++20
54        typedef value_type first_argument_type;  // deprecated in C++17, removed in C++20
55        typedef value_type second_argument_type;  // deprecated in C++17, removed in C++20
56        bool operator()(const value_type& x, const value_type& y) const;
57    };
58
59    // construct/copy/destroy:
60    map()
61        noexcept(
62            is_nothrow_default_constructible<allocator_type>::value &&
63            is_nothrow_default_constructible<key_compare>::value &&
64            is_nothrow_copy_constructible<key_compare>::value);
65    explicit map(const key_compare& comp);
66    map(const key_compare& comp, const allocator_type& a);
67    template <class InputIterator>
68        map(InputIterator first, InputIterator last,
69            const key_compare& comp = key_compare());
70    template <class InputIterator>
71        map(InputIterator first, InputIterator last,
72            const key_compare& comp, const allocator_type& a);
73    map(const map& m);
74    map(map&& m)
75        noexcept(
76            is_nothrow_move_constructible<allocator_type>::value &&
77            is_nothrow_move_constructible<key_compare>::value);
78    explicit map(const allocator_type& a);
79    map(const map& m, const allocator_type& a);
80    map(map&& m, const allocator_type& a);
81    map(initializer_list<value_type> il, const key_compare& comp = key_compare());
82    map(initializer_list<value_type> il, const key_compare& comp, const allocator_type& a);
83    template <class InputIterator>
84        map(InputIterator first, InputIterator last, const allocator_type& a)
85            : map(first, last, Compare(), a) {}  // C++14
86    map(initializer_list<value_type> il, const allocator_type& a)
87        : map(il, Compare(), a) {}  // C++14
88   ~map();
89
90    map& operator=(const map& m);
91    map& operator=(map&& m)
92        noexcept(
93            allocator_type::propagate_on_container_move_assignment::value &&
94            is_nothrow_move_assignable<allocator_type>::value &&
95            is_nothrow_move_assignable<key_compare>::value);
96    map& operator=(initializer_list<value_type> il);
97
98    // iterators:
99          iterator begin() noexcept;
100    const_iterator begin() const noexcept;
101          iterator end() noexcept;
102    const_iterator end()   const noexcept;
103
104          reverse_iterator rbegin() noexcept;
105    const_reverse_iterator rbegin() const noexcept;
106          reverse_iterator rend() noexcept;
107    const_reverse_iterator rend()   const noexcept;
108
109    const_iterator         cbegin()  const noexcept;
110    const_iterator         cend()    const noexcept;
111    const_reverse_iterator crbegin() const noexcept;
112    const_reverse_iterator crend()   const noexcept;
113
114    // capacity:
115    bool      empty()    const noexcept;
116    size_type size()     const noexcept;
117    size_type max_size() const noexcept;
118
119    // element access:
120    mapped_type& operator[](const key_type& k);
121    mapped_type& operator[](key_type&& k);
122
123          mapped_type& at(const key_type& k);
124    const mapped_type& at(const key_type& k) const;
125
126    // modifiers:
127    template <class... Args>
128        pair<iterator, bool> emplace(Args&&... args);
129    template <class... Args>
130        iterator emplace_hint(const_iterator position, Args&&... args);
131    pair<iterator, bool> insert(const value_type& v);
132    pair<iterator, bool> insert(      value_type&& v);                                // C++17
133    template <class P>
134        pair<iterator, bool> insert(P&& p);
135    iterator insert(const_iterator position, const value_type& v);
136    iterator insert(const_iterator position,       value_type&& v);                   // C++17
137    template <class P>
138        iterator insert(const_iterator position, P&& p);
139    template <class InputIterator>
140        void insert(InputIterator first, InputIterator last);
141    void insert(initializer_list<value_type> il);
142
143    node_type extract(const_iterator position);                                       // C++17
144    node_type extract(const key_type& x);                                             // C++17
145    insert_return_type insert(node_type&& nh);                                        // C++17
146    iterator insert(const_iterator hint, node_type&& nh);                             // C++17
147
148    template <class... Args>
149        pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);          // C++17
150    template <class... Args>
151        pair<iterator, bool> try_emplace(key_type&& k, Args&&... args);               // C++17
152    template <class... Args>
153        iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); // C++17
154    template <class... Args>
155        iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args);      // C++17
156    template <class M>
157        pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj);            // C++17
158    template <class M>
159        pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj);                 // C++17
160    template <class M>
161        iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj);   // C++17
162    template <class M>
163        iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj);        // C++17
164
165    iterator  erase(const_iterator position);
166    iterator  erase(iterator position); // C++14
167    size_type erase(const key_type& k);
168    iterator  erase(const_iterator first, const_iterator last);
169    void clear() noexcept;
170
171    template<class C2>
172      void merge(map<Key, T, C2, Allocator>& source);         // C++17
173    template<class C2>
174      void merge(map<Key, T, C2, Allocator>&& source);        // C++17
175    template<class C2>
176      void merge(multimap<Key, T, C2, Allocator>& source);    // C++17
177    template<class C2>
178      void merge(multimap<Key, T, C2, Allocator>&& source);   // C++17
179
180    void swap(map& m)
181        noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
182            is_nothrow_swappable<key_compare>::value); // C++17
183
184    // observers:
185    allocator_type get_allocator() const noexcept;
186    key_compare    key_comp()      const;
187    value_compare  value_comp()    const;
188
189    // map operations:
190          iterator find(const key_type& k);
191    const_iterator find(const key_type& k) const;
192    template<typename K>
193        iterator find(const K& x);              // C++14
194    template<typename K>
195        const_iterator find(const K& x) const;  // C++14
196
197    template<typename K>
198      size_type count(const K& x) const;        // C++14
199    size_type      count(const key_type& k) const;
200
201    bool           contains(const key_type& x) const;  // C++20
202    template<class K> bool contains(const K& x) const; // C++20
203
204          iterator lower_bound(const key_type& k);
205    const_iterator lower_bound(const key_type& k) const;
206    template<typename K>
207        iterator lower_bound(const K& x);              // C++14
208    template<typename K>
209        const_iterator lower_bound(const K& x) const;  // C++14
210
211          iterator upper_bound(const key_type& k);
212    const_iterator upper_bound(const key_type& k) const;
213    template<typename K>
214        iterator upper_bound(const K& x);              // C++14
215    template<typename K>
216        const_iterator upper_bound(const K& x) const;  // C++14
217
218    pair<iterator,iterator>             equal_range(const key_type& k);
219    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
220    template<typename K>
221        pair<iterator,iterator>             equal_range(const K& x);        // C++14
222    template<typename K>
223        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
224};
225
226template <class InputIterator,
227      class Compare = less<iter_key_t<InputIterator>>,
228      class Allocator = allocator<iter_to_alloc_t<InputIterator>>>
229map(InputIterator, InputIterator, Compare = Compare(), Allocator = Allocator())
230  -> map<iter_key_t<InputIterator>, iter_val_t<InputIterator>, Compare, Allocator>; // C++17
231
232template<class Key, class T, class Compare = less<Key>,
233    class Allocator = allocator<pair<const Key, T>>>
234map(initializer_list<pair<const Key, T>>, Compare = Compare(), Allocator = Allocator())
235  -> map<Key, T, Compare, Allocator>; // C++17
236
237template <class InputIterator, class Allocator>
238map(InputIterator, InputIterator, Allocator)
239  -> map<iter_key_t<InputIterator>, iter_val_t<InputIterator>, less<iter_key_t<InputIterator>>,
240    Allocator>; // C++17
241
242template<class Key, class T, class Allocator>
243map(initializer_list<pair<const Key, T>>, Allocator) -> map<Key, T, less<Key>, Allocator>; // C++17
244
245template <class Key, class T, class Compare, class Allocator>
246bool
247operator==(const map<Key, T, Compare, Allocator>& x,
248           const map<Key, T, Compare, Allocator>& y);
249
250template <class Key, class T, class Compare, class Allocator>
251bool
252operator< (const map<Key, T, Compare, Allocator>& x,
253           const map<Key, T, Compare, Allocator>& y);
254
255template <class Key, class T, class Compare, class Allocator>
256bool
257operator!=(const map<Key, T, Compare, Allocator>& x,
258           const map<Key, T, Compare, Allocator>& y);
259
260template <class Key, class T, class Compare, class Allocator>
261bool
262operator> (const map<Key, T, Compare, Allocator>& x,
263           const map<Key, T, Compare, Allocator>& y);
264
265template <class Key, class T, class Compare, class Allocator>
266bool
267operator>=(const map<Key, T, Compare, Allocator>& x,
268           const map<Key, T, Compare, Allocator>& y);
269
270template <class Key, class T, class Compare, class Allocator>
271bool
272operator<=(const map<Key, T, Compare, Allocator>& x,
273           const map<Key, T, Compare, Allocator>& y);
274
275// specialized algorithms:
276template <class Key, class T, class Compare, class Allocator>
277void
278swap(map<Key, T, Compare, Allocator>& x, map<Key, T, Compare, Allocator>& y)
279    noexcept(noexcept(x.swap(y)));
280
281template <class Key, class T, class Compare, class Allocator, class Predicate>
282typename map<Key, T, Compare, Allocator>::size_type
283erase_if(map<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
284
285
286template <class Key, class T, class Compare = less<Key>,
287          class Allocator = allocator<pair<const Key, T>>>
288class multimap
289{
290public:
291    // types:
292    typedef Key                                      key_type;
293    typedef T                                        mapped_type;
294    typedef pair<const key_type,mapped_type>         value_type;
295    typedef Compare                                  key_compare;
296    typedef Allocator                                allocator_type;
297    typedef typename allocator_type::reference       reference;
298    typedef typename allocator_type::const_reference const_reference;
299    typedef typename allocator_type::size_type       size_type;
300    typedef typename allocator_type::difference_type difference_type;
301    typedef typename allocator_type::pointer         pointer;
302    typedef typename allocator_type::const_pointer   const_pointer;
303
304    typedef implementation-defined                   iterator;
305    typedef implementation-defined                   const_iterator;
306    typedef std::reverse_iterator<iterator>          reverse_iterator;
307    typedef std::reverse_iterator<const_iterator>    const_reverse_iterator;
308    typedef unspecified                              node_type;              // C++17
309
310    class value_compare
311    {
312        friend class multimap;
313    protected:
314        key_compare comp;
315        value_compare(key_compare c);
316    public:
317        typedef bool result_type;  // deprecated in C++17, removed in C++20
318        typedef value_type first_argument_type;  // deprecated in C++17, removed in C++20
319        typedef value_type second_argument_type;  // deprecated in C++17, removed in C++20
320        bool operator()(const value_type& x, const value_type& y) const;
321    };
322
323    // construct/copy/destroy:
324    multimap()
325        noexcept(
326            is_nothrow_default_constructible<allocator_type>::value &&
327            is_nothrow_default_constructible<key_compare>::value &&
328            is_nothrow_copy_constructible<key_compare>::value);
329    explicit multimap(const key_compare& comp);
330    multimap(const key_compare& comp, const allocator_type& a);
331    template <class InputIterator>
332        multimap(InputIterator first, InputIterator last, const key_compare& comp);
333    template <class InputIterator>
334        multimap(InputIterator first, InputIterator last, const key_compare& comp,
335                 const allocator_type& a);
336    multimap(const multimap& m);
337    multimap(multimap&& m)
338        noexcept(
339            is_nothrow_move_constructible<allocator_type>::value &&
340            is_nothrow_move_constructible<key_compare>::value);
341    explicit multimap(const allocator_type& a);
342    multimap(const multimap& m, const allocator_type& a);
343    multimap(multimap&& m, const allocator_type& a);
344    multimap(initializer_list<value_type> il, const key_compare& comp = key_compare());
345    multimap(initializer_list<value_type> il, const key_compare& comp,
346             const allocator_type& a);
347    template <class InputIterator>
348        multimap(InputIterator first, InputIterator last, const allocator_type& a)
349            : multimap(first, last, Compare(), a) {} // C++14
350    multimap(initializer_list<value_type> il, const allocator_type& a)
351        : multimap(il, Compare(), a) {} // C++14
352    ~multimap();
353
354    multimap& operator=(const multimap& m);
355    multimap& operator=(multimap&& m)
356        noexcept(
357            allocator_type::propagate_on_container_move_assignment::value &&
358            is_nothrow_move_assignable<allocator_type>::value &&
359            is_nothrow_move_assignable<key_compare>::value);
360    multimap& operator=(initializer_list<value_type> il);
361
362    // iterators:
363          iterator begin() noexcept;
364    const_iterator begin() const noexcept;
365          iterator end() noexcept;
366    const_iterator end()   const noexcept;
367
368          reverse_iterator rbegin() noexcept;
369    const_reverse_iterator rbegin() const noexcept;
370          reverse_iterator rend() noexcept;
371    const_reverse_iterator rend()   const noexcept;
372
373    const_iterator         cbegin()  const noexcept;
374    const_iterator         cend()    const noexcept;
375    const_reverse_iterator crbegin() const noexcept;
376    const_reverse_iterator crend()   const noexcept;
377
378    // capacity:
379    bool      empty()    const noexcept;
380    size_type size()     const noexcept;
381    size_type max_size() const noexcept;
382
383    // modifiers:
384    template <class... Args>
385        iterator emplace(Args&&... args);
386    template <class... Args>
387        iterator emplace_hint(const_iterator position, Args&&... args);
388    iterator insert(const value_type& v);
389    iterator insert(      value_type&& v);                                            // C++17
390    template <class P>
391        iterator insert(P&& p);
392    iterator insert(const_iterator position, const value_type& v);
393    iterator insert(const_iterator position,       value_type&& v);                   // C++17
394    template <class P>
395        iterator insert(const_iterator position, P&& p);
396    template <class InputIterator>
397        void insert(InputIterator first, InputIterator last);
398    void insert(initializer_list<value_type> il);
399
400    node_type extract(const_iterator position);                                       // C++17
401    node_type extract(const key_type& x);                                             // C++17
402    iterator insert(node_type&& nh);                                                  // C++17
403    iterator insert(const_iterator hint, node_type&& nh);                             // C++17
404
405    iterator  erase(const_iterator position);
406    iterator  erase(iterator position); // C++14
407    size_type erase(const key_type& k);
408    iterator  erase(const_iterator first, const_iterator last);
409    void clear() noexcept;
410
411    template<class C2>
412      void merge(multimap<Key, T, C2, Allocator>& source);    // C++17
413    template<class C2>
414      void merge(multimap<Key, T, C2, Allocator>&& source);   // C++17
415    template<class C2>
416      void merge(map<Key, T, C2, Allocator>& source);         // C++17
417    template<class C2>
418      void merge(map<Key, T, C2, Allocator>&& source);        // C++17
419
420    void swap(multimap& m)
421        noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
422            is_nothrow_swappable<key_compare>::value); // C++17
423
424    // observers:
425    allocator_type get_allocator() const noexcept;
426    key_compare    key_comp()      const;
427    value_compare  value_comp()    const;
428
429    // map operations:
430          iterator find(const key_type& k);
431    const_iterator find(const key_type& k) const;
432    template<typename K>
433        iterator find(const K& x);              // C++14
434    template<typename K>
435        const_iterator find(const K& x) const;  // C++14
436
437    template<typename K>
438      size_type count(const K& x) const;        // C++14
439    size_type      count(const key_type& k) const;
440
441    bool           contains(const key_type& x) const;  // C++20
442    template<class K> bool contains(const K& x) const; // C++20
443
444          iterator lower_bound(const key_type& k);
445    const_iterator lower_bound(const key_type& k) const;
446    template<typename K>
447        iterator lower_bound(const K& x);              // C++14
448    template<typename K>
449        const_iterator lower_bound(const K& x) const;  // C++14
450
451          iterator upper_bound(const key_type& k);
452    const_iterator upper_bound(const key_type& k) const;
453    template<typename K>
454        iterator upper_bound(const K& x);              // C++14
455    template<typename K>
456        const_iterator upper_bound(const K& x) const;  // C++14
457
458    pair<iterator,iterator>             equal_range(const key_type& k);
459    pair<const_iterator,const_iterator> equal_range(const key_type& k) const;
460    template<typename K>
461        pair<iterator,iterator>             equal_range(const K& x);        // C++14
462    template<typename K>
463        pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14
464};
465
466template <class InputIterator,
467      class Compare = less<iter_key_t<InputIterator>>,
468      class Allocator = allocator<iter_to_alloc_t<InputIterator>>>
469multimap(InputIterator, InputIterator, Compare = Compare(), Allocator = Allocator())
470  -> multimap<iter_key_t<InputIterator>, iter_val_t<InputIterator>, Compare, Allocator>; // C++17
471
472template<class Key, class T, class Compare = less<Key>,
473    class Allocator = allocator<pair<const Key, T>>>
474multimap(initializer_list<pair<const Key, T>>, Compare = Compare(), Allocator = Allocator())
475  -> multimap<Key, T, Compare, Allocator>; // C++17
476
477template <class InputIterator, class Allocator>
478multimap(InputIterator, InputIterator, Allocator)
479  -> multimap<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
480    less<iter_key_t<InputIterator>>, Allocator>; // C++17
481
482template<class Key, class T, class Allocator>
483multimap(initializer_list<pair<const Key, T>>, Allocator)
484  -> multimap<Key, T, less<Key>, Allocator>; // C++17
485
486template <class Key, class T, class Compare, class Allocator>
487bool
488operator==(const multimap<Key, T, Compare, Allocator>& x,
489           const multimap<Key, T, Compare, Allocator>& y);
490
491template <class Key, class T, class Compare, class Allocator>
492bool
493operator< (const multimap<Key, T, Compare, Allocator>& x,
494           const multimap<Key, T, Compare, Allocator>& y);
495
496template <class Key, class T, class Compare, class Allocator>
497bool
498operator!=(const multimap<Key, T, Compare, Allocator>& x,
499           const multimap<Key, T, Compare, Allocator>& y);
500
501template <class Key, class T, class Compare, class Allocator>
502bool
503operator> (const multimap<Key, T, Compare, Allocator>& x,
504           const multimap<Key, T, Compare, Allocator>& y);
505
506template <class Key, class T, class Compare, class Allocator>
507bool
508operator>=(const multimap<Key, T, Compare, Allocator>& x,
509           const multimap<Key, T, Compare, Allocator>& y);
510
511template <class Key, class T, class Compare, class Allocator>
512bool
513operator<=(const multimap<Key, T, Compare, Allocator>& x,
514           const multimap<Key, T, Compare, Allocator>& y);
515
516// specialized algorithms:
517template <class Key, class T, class Compare, class Allocator>
518void
519swap(multimap<Key, T, Compare, Allocator>& x,
520     multimap<Key, T, Compare, Allocator>& y)
521    noexcept(noexcept(x.swap(y)));
522
523template <class Key, class T, class Compare, class Allocator, class Predicate>
524typename multimap<Key, T, Compare, Allocator>::size_type
525erase_if(multimap<Key, T, Compare, Allocator>& c, Predicate pred);  // C++20
526
527}  // std
528
529*/
530
531#include <__algorithm/equal.h>
532#include <__algorithm/lexicographical_compare.h>
533#include <__assert> // all public C++ headers provide the assertion handler
534#include <__config>
535#include <__functional/binary_function.h>
536#include <__functional/is_transparent.h>
537#include <__functional/operations.h>
538#include <__iterator/erase_if_container.h>
539#include <__iterator/iterator_traits.h>
540#include <__iterator/reverse_iterator.h>
541#include <__node_handle>
542#include <__tree>
543#include <__utility/forward.h>
544#include <__utility/swap.h>
545#include <memory>
546#include <type_traits>
547#include <version>
548
549#ifndef _LIBCPP_REMOVE_TRANSITIVE_INCLUDES
550#  include <functional>
551#  include <iterator>
552#  include <utility>
553#endif
554
555// standard-mandated includes
556
557// [iterator.range]
558#include <__iterator/access.h>
559#include <__iterator/data.h>
560#include <__iterator/empty.h>
561#include <__iterator/reverse_access.h>
562#include <__iterator/size.h>
563
564// [associative.map.syn]
565#include <compare>
566#include <initializer_list>
567
568#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
569#  pragma GCC system_header
570#endif
571
572_LIBCPP_BEGIN_NAMESPACE_STD
573
574template <class _Key, class _CP, class _Compare,
575          bool = is_empty<_Compare>::value && !__libcpp_is_final<_Compare>::value>
576class __map_value_compare
577    : private _Compare
578{
579public:
580    _LIBCPP_INLINE_VISIBILITY
581    __map_value_compare()
582        _NOEXCEPT_(is_nothrow_default_constructible<_Compare>::value)
583        : _Compare() {}
584    _LIBCPP_INLINE_VISIBILITY
585    __map_value_compare(_Compare c)
586        _NOEXCEPT_(is_nothrow_copy_constructible<_Compare>::value)
587        : _Compare(c) {}
588    _LIBCPP_INLINE_VISIBILITY
589    const _Compare& key_comp() const _NOEXCEPT {return *this;}
590    _LIBCPP_INLINE_VISIBILITY
591    bool operator()(const _CP& __x, const _CP& __y) const
592        {return static_cast<const _Compare&>(*this)(__x.__get_value().first, __y.__get_value().first);}
593    _LIBCPP_INLINE_VISIBILITY
594    bool operator()(const _CP& __x, const _Key& __y) const
595        {return static_cast<const _Compare&>(*this)(__x.__get_value().first, __y);}
596    _LIBCPP_INLINE_VISIBILITY
597    bool operator()(const _Key& __x, const _CP& __y) const
598        {return static_cast<const _Compare&>(*this)(__x, __y.__get_value().first);}
599    void swap(__map_value_compare& __y)
600        _NOEXCEPT_(__is_nothrow_swappable<_Compare>::value)
601    {
602      using _VSTD::swap;
603      swap(static_cast<_Compare&>(*this), static_cast<_Compare&>(__y));
604    }
605
606#if _LIBCPP_STD_VER > 11
607    template <typename _K2>
608    _LIBCPP_INLINE_VISIBILITY
609    bool operator()(const _K2& __x, const _CP& __y) const
610        {return static_cast<const _Compare&>(*this)(__x, __y.__get_value().first);}
611
612    template <typename _K2>
613    _LIBCPP_INLINE_VISIBILITY
614    bool operator()(const _CP& __x, const _K2& __y) const
615        {return static_cast<const _Compare&>(*this)(__x.__get_value().first, __y);}
616#endif
617};
618
619template <class _Key, class _CP, class _Compare>
620class __map_value_compare<_Key, _CP, _Compare, false>
621{
622    _Compare comp;
623
624public:
625    _LIBCPP_INLINE_VISIBILITY
626    __map_value_compare()
627        _NOEXCEPT_(is_nothrow_default_constructible<_Compare>::value)
628        : comp() {}
629    _LIBCPP_INLINE_VISIBILITY
630    __map_value_compare(_Compare c)
631        _NOEXCEPT_(is_nothrow_copy_constructible<_Compare>::value)
632        : comp(c) {}
633    _LIBCPP_INLINE_VISIBILITY
634    const _Compare& key_comp() const _NOEXCEPT {return comp;}
635
636    _LIBCPP_INLINE_VISIBILITY
637    bool operator()(const _CP& __x, const _CP& __y) const
638        {return comp(__x.__get_value().first, __y.__get_value().first);}
639    _LIBCPP_INLINE_VISIBILITY
640    bool operator()(const _CP& __x, const _Key& __y) const
641        {return comp(__x.__get_value().first, __y);}
642    _LIBCPP_INLINE_VISIBILITY
643    bool operator()(const _Key& __x, const _CP& __y) const
644        {return comp(__x, __y.__get_value().first);}
645    void swap(__map_value_compare& __y)
646        _NOEXCEPT_(__is_nothrow_swappable<_Compare>::value)
647    {
648        using _VSTD::swap;
649        swap(comp, __y.comp);
650    }
651
652#if _LIBCPP_STD_VER > 11
653    template <typename _K2>
654    _LIBCPP_INLINE_VISIBILITY
655    bool operator()(const _K2& __x, const _CP& __y) const
656        {return comp(__x, __y.__get_value().first);}
657
658    template <typename _K2>
659    _LIBCPP_INLINE_VISIBILITY
660    bool operator()(const _CP& __x, const _K2& __y) const
661        {return comp(__x.__get_value().first, __y);}
662#endif
663};
664
665template <class _Key, class _CP, class _Compare, bool __b>
666inline _LIBCPP_INLINE_VISIBILITY
667void
668swap(__map_value_compare<_Key, _CP, _Compare, __b>& __x,
669     __map_value_compare<_Key, _CP, _Compare, __b>& __y)
670    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
671{
672    __x.swap(__y);
673}
674
675template <class _Allocator>
676class __map_node_destructor
677{
678    typedef _Allocator                          allocator_type;
679    typedef allocator_traits<allocator_type>    __alloc_traits;
680
681public:
682    typedef typename __alloc_traits::pointer    pointer;
683
684private:
685    allocator_type& __na_;
686
687    __map_node_destructor& operator=(const __map_node_destructor&);
688
689public:
690    bool __first_constructed;
691    bool __second_constructed;
692
693    _LIBCPP_INLINE_VISIBILITY
694    explicit __map_node_destructor(allocator_type& __na) _NOEXCEPT
695        : __na_(__na),
696          __first_constructed(false),
697          __second_constructed(false)
698        {}
699
700#ifndef _LIBCPP_CXX03_LANG
701    _LIBCPP_INLINE_VISIBILITY
702    __map_node_destructor(__tree_node_destructor<allocator_type>&& __x) _NOEXCEPT
703        : __na_(__x.__na_),
704          __first_constructed(__x.__value_constructed),
705          __second_constructed(__x.__value_constructed)
706        {
707            __x.__value_constructed = false;
708        }
709#endif // _LIBCPP_CXX03_LANG
710
711    _LIBCPP_INLINE_VISIBILITY
712    void operator()(pointer __p) _NOEXCEPT
713    {
714        if (__second_constructed)
715            __alloc_traits::destroy(__na_, _VSTD::addressof(__p->__value_.__get_value().second));
716        if (__first_constructed)
717            __alloc_traits::destroy(__na_, _VSTD::addressof(__p->__value_.__get_value().first));
718        if (__p)
719            __alloc_traits::deallocate(__na_, __p, 1);
720    }
721};
722
723template <class _Key, class _Tp, class _Compare, class _Allocator>
724    class map;
725template <class _Key, class _Tp, class _Compare, class _Allocator>
726    class multimap;
727template <class _TreeIterator> class __map_const_iterator;
728
729#ifndef _LIBCPP_CXX03_LANG
730
731template <class _Key, class _Tp>
732struct _LIBCPP_STANDALONE_DEBUG __value_type
733{
734    typedef _Key                                     key_type;
735    typedef _Tp                                      mapped_type;
736    typedef pair<const key_type, mapped_type>        value_type;
737    typedef pair<key_type&, mapped_type&>            __nc_ref_pair_type;
738    typedef pair<key_type&&, mapped_type&&>          __nc_rref_pair_type;
739
740private:
741    value_type __cc;
742
743public:
744    _LIBCPP_INLINE_VISIBILITY
745    value_type& __get_value()
746    {
747#if _LIBCPP_STD_VER > 14
748        return *_VSTD::launder(_VSTD::addressof(__cc));
749#else
750        return __cc;
751#endif
752    }
753
754    _LIBCPP_INLINE_VISIBILITY
755    const value_type& __get_value() const
756    {
757#if _LIBCPP_STD_VER > 14
758        return *_VSTD::launder(_VSTD::addressof(__cc));
759#else
760        return __cc;
761#endif
762    }
763
764    _LIBCPP_INLINE_VISIBILITY
765    __nc_ref_pair_type __ref()
766    {
767        value_type& __v = __get_value();
768        return __nc_ref_pair_type(const_cast<key_type&>(__v.first), __v.second);
769    }
770
771    _LIBCPP_INLINE_VISIBILITY
772    __nc_rref_pair_type __move()
773    {
774        value_type& __v = __get_value();
775        return __nc_rref_pair_type(
776            _VSTD::move(const_cast<key_type&>(__v.first)),
777            _VSTD::move(__v.second));
778    }
779
780    _LIBCPP_INLINE_VISIBILITY
781    __value_type& operator=(const __value_type& __v)
782    {
783        __ref() = __v.__get_value();
784        return *this;
785    }
786
787    _LIBCPP_INLINE_VISIBILITY
788    __value_type& operator=(__value_type&& __v)
789    {
790        __ref() = __v.__move();
791        return *this;
792    }
793
794    template <class _ValueTp,
795              class = typename enable_if<
796                    __is_same_uncvref<_ValueTp, value_type>::value
797                 >::type
798             >
799    _LIBCPP_INLINE_VISIBILITY
800    __value_type& operator=(_ValueTp&& __v)
801    {
802        __ref() = _VSTD::forward<_ValueTp>(__v);
803        return *this;
804    }
805
806private:
807    __value_type() = delete;
808    ~__value_type() = delete;
809    __value_type(const __value_type&) = delete;
810    __value_type(__value_type&&) = delete;
811};
812
813#else
814
815template <class _Key, class _Tp>
816struct __value_type
817{
818    typedef _Key                                     key_type;
819    typedef _Tp                                      mapped_type;
820    typedef pair<const key_type, mapped_type>        value_type;
821
822private:
823    value_type __cc;
824
825public:
826    _LIBCPP_INLINE_VISIBILITY
827    value_type& __get_value() { return __cc; }
828    _LIBCPP_INLINE_VISIBILITY
829    const value_type& __get_value() const { return __cc; }
830
831private:
832   __value_type();
833   __value_type(__value_type const&);
834   __value_type& operator=(__value_type const&);
835   ~__value_type();
836};
837
838#endif // _LIBCPP_CXX03_LANG
839
840template <class _Tp>
841struct __extract_key_value_types;
842
843template <class _Key, class _Tp>
844struct __extract_key_value_types<__value_type<_Key, _Tp> >
845{
846  typedef _Key const __key_type;
847  typedef _Tp        __mapped_type;
848};
849
850template <class _TreeIterator>
851class _LIBCPP_TEMPLATE_VIS __map_iterator
852{
853    typedef typename _TreeIterator::_NodeTypes                   _NodeTypes;
854    typedef typename _TreeIterator::__pointer_traits             __pointer_traits;
855
856    _TreeIterator __i_;
857
858public:
859    typedef bidirectional_iterator_tag                           iterator_category;
860    typedef typename _NodeTypes::__map_value_type                value_type;
861    typedef typename _TreeIterator::difference_type              difference_type;
862    typedef value_type&                                          reference;
863    typedef typename _NodeTypes::__map_value_type_pointer        pointer;
864
865    _LIBCPP_INLINE_VISIBILITY
866    __map_iterator() _NOEXCEPT {}
867
868    _LIBCPP_INLINE_VISIBILITY
869    __map_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}
870
871    _LIBCPP_INLINE_VISIBILITY
872    reference operator*() const {return __i_->__get_value();}
873    _LIBCPP_INLINE_VISIBILITY
874    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__get_value());}
875
876    _LIBCPP_INLINE_VISIBILITY
877    __map_iterator& operator++() {++__i_; return *this;}
878    _LIBCPP_INLINE_VISIBILITY
879    __map_iterator operator++(int)
880    {
881        __map_iterator __t(*this);
882        ++(*this);
883        return __t;
884    }
885
886    _LIBCPP_INLINE_VISIBILITY
887    __map_iterator& operator--() {--__i_; return *this;}
888    _LIBCPP_INLINE_VISIBILITY
889    __map_iterator operator--(int)
890    {
891        __map_iterator __t(*this);
892        --(*this);
893        return __t;
894    }
895
896    friend _LIBCPP_INLINE_VISIBILITY
897    bool operator==(const __map_iterator& __x, const __map_iterator& __y)
898        {return __x.__i_ == __y.__i_;}
899    friend
900    _LIBCPP_INLINE_VISIBILITY
901    bool operator!=(const __map_iterator& __x, const __map_iterator& __y)
902        {return __x.__i_ != __y.__i_;}
903
904    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
905    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
906    template <class> friend class _LIBCPP_TEMPLATE_VIS __map_const_iterator;
907};
908
909template <class _TreeIterator>
910class _LIBCPP_TEMPLATE_VIS __map_const_iterator
911{
912    typedef typename _TreeIterator::_NodeTypes                   _NodeTypes;
913    typedef typename _TreeIterator::__pointer_traits             __pointer_traits;
914
915    _TreeIterator __i_;
916
917public:
918    typedef bidirectional_iterator_tag                           iterator_category;
919    typedef typename _NodeTypes::__map_value_type                value_type;
920    typedef typename _TreeIterator::difference_type              difference_type;
921    typedef const value_type&                                    reference;
922    typedef typename _NodeTypes::__const_map_value_type_pointer  pointer;
923
924    _LIBCPP_INLINE_VISIBILITY
925    __map_const_iterator() _NOEXCEPT {}
926
927    _LIBCPP_INLINE_VISIBILITY
928    __map_const_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}
929    _LIBCPP_INLINE_VISIBILITY
930    __map_const_iterator(__map_iterator<
931        typename _TreeIterator::__non_const_iterator> __i) _NOEXCEPT
932        : __i_(__i.__i_) {}
933
934    _LIBCPP_INLINE_VISIBILITY
935    reference operator*() const {return __i_->__get_value();}
936    _LIBCPP_INLINE_VISIBILITY
937    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__get_value());}
938
939    _LIBCPP_INLINE_VISIBILITY
940    __map_const_iterator& operator++() {++__i_; return *this;}
941    _LIBCPP_INLINE_VISIBILITY
942    __map_const_iterator operator++(int)
943    {
944        __map_const_iterator __t(*this);
945        ++(*this);
946        return __t;
947    }
948
949    _LIBCPP_INLINE_VISIBILITY
950    __map_const_iterator& operator--() {--__i_; return *this;}
951    _LIBCPP_INLINE_VISIBILITY
952    __map_const_iterator operator--(int)
953    {
954        __map_const_iterator __t(*this);
955        --(*this);
956        return __t;
957    }
958
959    friend _LIBCPP_INLINE_VISIBILITY
960    bool operator==(const __map_const_iterator& __x, const __map_const_iterator& __y)
961        {return __x.__i_ == __y.__i_;}
962    friend _LIBCPP_INLINE_VISIBILITY
963    bool operator!=(const __map_const_iterator& __x, const __map_const_iterator& __y)
964        {return __x.__i_ != __y.__i_;}
965
966    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
967    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
968    template <class, class, class> friend class _LIBCPP_TEMPLATE_VIS __tree_const_iterator;
969};
970
971template <class _Key, class _Tp, class _Compare = less<_Key>,
972          class _Allocator = allocator<pair<const _Key, _Tp> > >
973class _LIBCPP_TEMPLATE_VIS map
974{
975public:
976    // types:
977    typedef _Key                                     key_type;
978    typedef _Tp                                      mapped_type;
979    typedef pair<const key_type, mapped_type>        value_type;
980    typedef __type_identity_t<_Compare>              key_compare;
981    typedef __type_identity_t<_Allocator>            allocator_type;
982    typedef value_type&                              reference;
983    typedef const value_type&                        const_reference;
984
985    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
986                  "Allocator::value_type must be same type as value_type");
987
988    class _LIBCPP_TEMPLATE_VIS value_compare
989        : public __binary_function<value_type, value_type, bool>
990    {
991        friend class map;
992    protected:
993        key_compare comp;
994
995        _LIBCPP_INLINE_VISIBILITY value_compare(key_compare c) : comp(c) {}
996    public:
997        _LIBCPP_INLINE_VISIBILITY
998        bool operator()(const value_type& __x, const value_type& __y) const
999            {return comp(__x.first, __y.first);}
1000    };
1001
1002private:
1003
1004    typedef _VSTD::__value_type<key_type, mapped_type>             __value_type;
1005    typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
1006    typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
1007                                                 __value_type>::type __allocator_type;
1008    typedef __tree<__value_type, __vc, __allocator_type>   __base;
1009    typedef typename __base::__node_traits                 __node_traits;
1010    typedef allocator_traits<allocator_type>               __alloc_traits;
1011
1012    __base __tree_;
1013
1014public:
1015    typedef typename __alloc_traits::pointer               pointer;
1016    typedef typename __alloc_traits::const_pointer         const_pointer;
1017    typedef typename __alloc_traits::size_type             size_type;
1018    typedef typename __alloc_traits::difference_type       difference_type;
1019    typedef __map_iterator<typename __base::iterator>             iterator;
1020    typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
1021    typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
1022    typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
1023
1024#if _LIBCPP_STD_VER > 14
1025    typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
1026    typedef __insert_return_type<iterator, node_type> insert_return_type;
1027#endif
1028
1029    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1030        friend class _LIBCPP_TEMPLATE_VIS map;
1031    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1032        friend class _LIBCPP_TEMPLATE_VIS multimap;
1033
1034    _LIBCPP_INLINE_VISIBILITY
1035    map()
1036        _NOEXCEPT_(
1037            is_nothrow_default_constructible<allocator_type>::value &&
1038            is_nothrow_default_constructible<key_compare>::value &&
1039            is_nothrow_copy_constructible<key_compare>::value)
1040        : __tree_(__vc(key_compare())) {}
1041
1042    _LIBCPP_INLINE_VISIBILITY
1043    explicit map(const key_compare& __comp)
1044        _NOEXCEPT_(
1045            is_nothrow_default_constructible<allocator_type>::value &&
1046            is_nothrow_copy_constructible<key_compare>::value)
1047        : __tree_(__vc(__comp)) {}
1048
1049    _LIBCPP_INLINE_VISIBILITY
1050    explicit map(const key_compare& __comp, const allocator_type& __a)
1051        : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}
1052
1053    template <class _InputIterator>
1054    _LIBCPP_INLINE_VISIBILITY
1055        map(_InputIterator __f, _InputIterator __l,
1056            const key_compare& __comp = key_compare())
1057        : __tree_(__vc(__comp))
1058        {
1059            insert(__f, __l);
1060        }
1061
1062    template <class _InputIterator>
1063    _LIBCPP_INLINE_VISIBILITY
1064        map(_InputIterator __f, _InputIterator __l,
1065            const key_compare& __comp, const allocator_type& __a)
1066        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1067        {
1068            insert(__f, __l);
1069        }
1070
1071#if _LIBCPP_STD_VER > 11
1072    template <class _InputIterator>
1073    _LIBCPP_INLINE_VISIBILITY
1074    map(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
1075        : map(__f, __l, key_compare(), __a) {}
1076#endif
1077
1078    _LIBCPP_INLINE_VISIBILITY
1079    map(const map& __m)
1080        : __tree_(__m.__tree_)
1081        {
1082            insert(__m.begin(), __m.end());
1083        }
1084
1085    _LIBCPP_INLINE_VISIBILITY
1086    map& operator=(const map& __m)
1087        {
1088#ifndef _LIBCPP_CXX03_LANG
1089            __tree_ = __m.__tree_;
1090#else
1091            if (this != _VSTD::addressof(__m)) {
1092                __tree_.clear();
1093                __tree_.value_comp() = __m.__tree_.value_comp();
1094                __tree_.__copy_assign_alloc(__m.__tree_);
1095                insert(__m.begin(), __m.end());
1096            }
1097#endif
1098            return *this;
1099        }
1100
1101#ifndef _LIBCPP_CXX03_LANG
1102
1103    _LIBCPP_INLINE_VISIBILITY
1104    map(map&& __m)
1105        _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
1106        : __tree_(_VSTD::move(__m.__tree_))
1107        {
1108        }
1109
1110    map(map&& __m, const allocator_type& __a);
1111
1112    _LIBCPP_INLINE_VISIBILITY
1113    map& operator=(map&& __m)
1114        _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
1115        {
1116            __tree_ = _VSTD::move(__m.__tree_);
1117            return *this;
1118        }
1119
1120    _LIBCPP_INLINE_VISIBILITY
1121    map(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
1122        : __tree_(__vc(__comp))
1123        {
1124            insert(__il.begin(), __il.end());
1125        }
1126
1127    _LIBCPP_INLINE_VISIBILITY
1128    map(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
1129        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1130        {
1131            insert(__il.begin(), __il.end());
1132        }
1133
1134#if _LIBCPP_STD_VER > 11
1135    _LIBCPP_INLINE_VISIBILITY
1136    map(initializer_list<value_type> __il, const allocator_type& __a)
1137        : map(__il, key_compare(), __a) {}
1138#endif
1139
1140    _LIBCPP_INLINE_VISIBILITY
1141    map& operator=(initializer_list<value_type> __il)
1142        {
1143            __tree_.__assign_unique(__il.begin(), __il.end());
1144            return *this;
1145        }
1146
1147#endif // _LIBCPP_CXX03_LANG
1148
1149    _LIBCPP_INLINE_VISIBILITY
1150    explicit map(const allocator_type& __a)
1151        : __tree_(typename __base::allocator_type(__a))
1152        {
1153        }
1154
1155    _LIBCPP_INLINE_VISIBILITY
1156    map(const map& __m, const allocator_type& __a)
1157        : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
1158        {
1159            insert(__m.begin(), __m.end());
1160        }
1161
1162    _LIBCPP_INLINE_VISIBILITY
1163    ~map() {
1164        static_assert(sizeof(__diagnose_non_const_comparator<_Key, _Compare>()), "");
1165    }
1166
1167    _LIBCPP_INLINE_VISIBILITY
1168          iterator begin() _NOEXCEPT {return __tree_.begin();}
1169    _LIBCPP_INLINE_VISIBILITY
1170    const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
1171    _LIBCPP_INLINE_VISIBILITY
1172          iterator end() _NOEXCEPT {return __tree_.end();}
1173    _LIBCPP_INLINE_VISIBILITY
1174    const_iterator end() const _NOEXCEPT {return __tree_.end();}
1175
1176    _LIBCPP_INLINE_VISIBILITY
1177          reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
1178    _LIBCPP_INLINE_VISIBILITY
1179    const_reverse_iterator rbegin() const _NOEXCEPT
1180        {return const_reverse_iterator(end());}
1181    _LIBCPP_INLINE_VISIBILITY
1182          reverse_iterator rend() _NOEXCEPT
1183            {return       reverse_iterator(begin());}
1184    _LIBCPP_INLINE_VISIBILITY
1185    const_reverse_iterator rend() const _NOEXCEPT
1186        {return const_reverse_iterator(begin());}
1187
1188    _LIBCPP_INLINE_VISIBILITY
1189    const_iterator cbegin() const _NOEXCEPT {return begin();}
1190    _LIBCPP_INLINE_VISIBILITY
1191    const_iterator cend() const _NOEXCEPT {return end();}
1192    _LIBCPP_INLINE_VISIBILITY
1193    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
1194    _LIBCPP_INLINE_VISIBILITY
1195    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
1196
1197    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1198    bool      empty() const _NOEXCEPT {return __tree_.size() == 0;}
1199    _LIBCPP_INLINE_VISIBILITY
1200    size_type size() const _NOEXCEPT {return __tree_.size();}
1201    _LIBCPP_INLINE_VISIBILITY
1202    size_type max_size() const _NOEXCEPT {return __tree_.max_size();}
1203
1204    mapped_type& operator[](const key_type& __k);
1205#ifndef _LIBCPP_CXX03_LANG
1206    mapped_type& operator[](key_type&& __k);
1207#endif
1208
1209          mapped_type& at(const key_type& __k);
1210    const mapped_type& at(const key_type& __k) const;
1211
1212    _LIBCPP_INLINE_VISIBILITY
1213    allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
1214    _LIBCPP_INLINE_VISIBILITY
1215    key_compare    key_comp()      const {return __tree_.value_comp().key_comp();}
1216    _LIBCPP_INLINE_VISIBILITY
1217    value_compare  value_comp()    const {return value_compare(__tree_.value_comp().key_comp());}
1218
1219#ifndef _LIBCPP_CXX03_LANG
1220    template <class ..._Args>
1221    _LIBCPP_INLINE_VISIBILITY
1222    pair<iterator, bool> emplace(_Args&& ...__args) {
1223        return __tree_.__emplace_unique(_VSTD::forward<_Args>(__args)...);
1224    }
1225
1226    template <class ..._Args>
1227    _LIBCPP_INLINE_VISIBILITY
1228    iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
1229        return __tree_.__emplace_hint_unique(__p.__i_, _VSTD::forward<_Args>(__args)...);
1230    }
1231
1232    template <class _Pp,
1233              class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
1234        _LIBCPP_INLINE_VISIBILITY
1235        pair<iterator, bool> insert(_Pp&& __p)
1236            {return __tree_.__insert_unique(_VSTD::forward<_Pp>(__p));}
1237
1238    template <class _Pp,
1239              class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
1240        _LIBCPP_INLINE_VISIBILITY
1241        iterator insert(const_iterator __pos, _Pp&& __p)
1242            {return __tree_.__insert_unique(__pos.__i_, _VSTD::forward<_Pp>(__p));}
1243
1244#endif // _LIBCPP_CXX03_LANG
1245
1246    _LIBCPP_INLINE_VISIBILITY
1247    pair<iterator, bool>
1248        insert(const value_type& __v) {return __tree_.__insert_unique(__v);}
1249
1250    _LIBCPP_INLINE_VISIBILITY
1251    iterator
1252        insert(const_iterator __p, const value_type& __v)
1253            {return __tree_.__insert_unique(__p.__i_, __v);}
1254
1255#ifndef _LIBCPP_CXX03_LANG
1256    _LIBCPP_INLINE_VISIBILITY
1257    pair<iterator, bool>
1258    insert(value_type&& __v) {return __tree_.__insert_unique(_VSTD::move(__v));}
1259
1260    _LIBCPP_INLINE_VISIBILITY
1261    iterator insert(const_iterator __p,  value_type&& __v)
1262    {return __tree_.__insert_unique(__p.__i_, _VSTD::move(__v));}
1263
1264    _LIBCPP_INLINE_VISIBILITY
1265    void insert(initializer_list<value_type> __il)
1266        {insert(__il.begin(), __il.end());}
1267#endif
1268
1269    template <class _InputIterator>
1270        _LIBCPP_INLINE_VISIBILITY
1271        void insert(_InputIterator __f, _InputIterator __l)
1272        {
1273            for (const_iterator __e = cend(); __f != __l; ++__f)
1274                insert(__e.__i_, *__f);
1275        }
1276
1277#if _LIBCPP_STD_VER > 14
1278
1279    template <class... _Args>
1280        _LIBCPP_INLINE_VISIBILITY
1281        pair<iterator, bool> try_emplace(const key_type& __k, _Args&&... __args)
1282    {
1283        return __tree_.__emplace_unique_key_args(__k,
1284            _VSTD::piecewise_construct,
1285            _VSTD::forward_as_tuple(__k),
1286            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
1287    }
1288
1289    template <class... _Args>
1290        _LIBCPP_INLINE_VISIBILITY
1291        pair<iterator, bool> try_emplace(key_type&& __k, _Args&&... __args)
1292    {
1293        return __tree_.__emplace_unique_key_args(__k,
1294            _VSTD::piecewise_construct,
1295            _VSTD::forward_as_tuple(_VSTD::move(__k)),
1296            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
1297    }
1298
1299    template <class... _Args>
1300        _LIBCPP_INLINE_VISIBILITY
1301        iterator try_emplace(const_iterator __h, const key_type& __k, _Args&&... __args)
1302    {
1303        return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
1304            _VSTD::piecewise_construct,
1305            _VSTD::forward_as_tuple(__k),
1306            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)).first;
1307    }
1308
1309    template <class... _Args>
1310        _LIBCPP_INLINE_VISIBILITY
1311        iterator try_emplace(const_iterator __h, key_type&& __k, _Args&&... __args)
1312    {
1313        return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
1314            _VSTD::piecewise_construct,
1315            _VSTD::forward_as_tuple(_VSTD::move(__k)),
1316            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)).first;
1317    }
1318
1319    template <class _Vp>
1320        _LIBCPP_INLINE_VISIBILITY
1321        pair<iterator, bool> insert_or_assign(const key_type& __k, _Vp&& __v)
1322    {
1323        iterator __p = lower_bound(__k);
1324        if ( __p != end() && !key_comp()(__k, __p->first))
1325        {
1326            __p->second = _VSTD::forward<_Vp>(__v);
1327            return _VSTD::make_pair(__p, false);
1328        }
1329        return _VSTD::make_pair(emplace_hint(__p, __k, _VSTD::forward<_Vp>(__v)), true);
1330    }
1331
1332    template <class _Vp>
1333        _LIBCPP_INLINE_VISIBILITY
1334        pair<iterator, bool> insert_or_assign(key_type&& __k, _Vp&& __v)
1335    {
1336        iterator __p = lower_bound(__k);
1337        if ( __p != end() && !key_comp()(__k, __p->first))
1338        {
1339            __p->second = _VSTD::forward<_Vp>(__v);
1340            return _VSTD::make_pair(__p, false);
1341        }
1342        return _VSTD::make_pair(emplace_hint(__p, _VSTD::move(__k), _VSTD::forward<_Vp>(__v)), true);
1343    }
1344
1345    template <class _Vp>
1346    _LIBCPP_INLINE_VISIBILITY iterator insert_or_assign(const_iterator __h,
1347                                                        const key_type& __k,
1348                                                        _Vp&& __v) {
1349      auto [__r, __inserted] = __tree_.__emplace_hint_unique_key_args(
1350          __h.__i_, __k, __k, _VSTD::forward<_Vp>(__v));
1351
1352      if (!__inserted)
1353        __r->__get_value().second = _VSTD::forward<_Vp>(__v);
1354
1355      return __r;
1356    }
1357
1358    template <class _Vp>
1359    _LIBCPP_INLINE_VISIBILITY iterator insert_or_assign(const_iterator __h,
1360                                                        key_type&& __k,
1361                                                        _Vp&& __v) {
1362      auto [__r, __inserted] = __tree_.__emplace_hint_unique_key_args(
1363          __h.__i_, __k, _VSTD::move(__k), _VSTD::forward<_Vp>(__v));
1364
1365      if (!__inserted)
1366        __r->__get_value().second = _VSTD::forward<_Vp>(__v);
1367
1368      return __r;
1369    }
1370
1371#endif // _LIBCPP_STD_VER > 14
1372
1373    _LIBCPP_INLINE_VISIBILITY
1374    iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
1375    _LIBCPP_INLINE_VISIBILITY
1376    iterator erase(iterator __p)       {return __tree_.erase(__p.__i_);}
1377    _LIBCPP_INLINE_VISIBILITY
1378    size_type erase(const key_type& __k)
1379        {return __tree_.__erase_unique(__k);}
1380    _LIBCPP_INLINE_VISIBILITY
1381    iterator  erase(const_iterator __f, const_iterator __l)
1382        {return __tree_.erase(__f.__i_, __l.__i_);}
1383    _LIBCPP_INLINE_VISIBILITY
1384    void clear() _NOEXCEPT {__tree_.clear();}
1385
1386#if _LIBCPP_STD_VER > 14
1387    _LIBCPP_INLINE_VISIBILITY
1388    insert_return_type insert(node_type&& __nh)
1389    {
1390        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
1391            "node_type with incompatible allocator passed to map::insert()");
1392        return __tree_.template __node_handle_insert_unique<
1393            node_type, insert_return_type>(_VSTD::move(__nh));
1394    }
1395    _LIBCPP_INLINE_VISIBILITY
1396    iterator insert(const_iterator __hint, node_type&& __nh)
1397    {
1398        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
1399            "node_type with incompatible allocator passed to map::insert()");
1400        return __tree_.template __node_handle_insert_unique<node_type>(
1401            __hint.__i_, _VSTD::move(__nh));
1402    }
1403    _LIBCPP_INLINE_VISIBILITY
1404    node_type extract(key_type const& __key)
1405    {
1406        return __tree_.template __node_handle_extract<node_type>(__key);
1407    }
1408    _LIBCPP_INLINE_VISIBILITY
1409    node_type extract(const_iterator __it)
1410    {
1411        return __tree_.template __node_handle_extract<node_type>(__it.__i_);
1412    }
1413    template <class _Compare2>
1414    _LIBCPP_INLINE_VISIBILITY
1415    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
1416    {
1417        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1418                       "merging container with incompatible allocator");
1419        __tree_.__node_handle_merge_unique(__source.__tree_);
1420    }
1421    template <class _Compare2>
1422    _LIBCPP_INLINE_VISIBILITY
1423    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
1424    {
1425        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1426                       "merging container with incompatible allocator");
1427        __tree_.__node_handle_merge_unique(__source.__tree_);
1428    }
1429    template <class _Compare2>
1430    _LIBCPP_INLINE_VISIBILITY
1431    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
1432    {
1433        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1434                       "merging container with incompatible allocator");
1435        __tree_.__node_handle_merge_unique(__source.__tree_);
1436    }
1437    template <class _Compare2>
1438    _LIBCPP_INLINE_VISIBILITY
1439    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
1440    {
1441        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1442                       "merging container with incompatible allocator");
1443        __tree_.__node_handle_merge_unique(__source.__tree_);
1444    }
1445#endif
1446
1447    _LIBCPP_INLINE_VISIBILITY
1448    void swap(map& __m)
1449        _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
1450        {__tree_.swap(__m.__tree_);}
1451
1452    _LIBCPP_INLINE_VISIBILITY
1453    iterator find(const key_type& __k)             {return __tree_.find(__k);}
1454    _LIBCPP_INLINE_VISIBILITY
1455    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
1456#if _LIBCPP_STD_VER > 11
1457    template <typename _K2>
1458    _LIBCPP_INLINE_VISIBILITY
1459    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
1460    find(const _K2& __k)                           {return __tree_.find(__k);}
1461    template <typename _K2>
1462    _LIBCPP_INLINE_VISIBILITY
1463    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
1464    find(const _K2& __k) const                     {return __tree_.find(__k);}
1465#endif
1466
1467    _LIBCPP_INLINE_VISIBILITY
1468    size_type      count(const key_type& __k) const
1469        {return __tree_.__count_unique(__k);}
1470#if _LIBCPP_STD_VER > 11
1471    template <typename _K2>
1472    _LIBCPP_INLINE_VISIBILITY
1473    typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
1474    count(const _K2& __k) const {return __tree_.__count_multi(__k);}
1475#endif
1476
1477#if _LIBCPP_STD_VER > 17
1478    _LIBCPP_INLINE_VISIBILITY
1479    bool contains(const key_type& __k) const {return find(__k) != end();}
1480    template <typename _K2>
1481    _LIBCPP_INLINE_VISIBILITY
1482    typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
1483    contains(const _K2& __k) const { return find(__k) != end(); }
1484#endif // _LIBCPP_STD_VER > 17
1485
1486    _LIBCPP_INLINE_VISIBILITY
1487    iterator lower_bound(const key_type& __k)
1488        {return __tree_.lower_bound(__k);}
1489    _LIBCPP_INLINE_VISIBILITY
1490    const_iterator lower_bound(const key_type& __k) const
1491        {return __tree_.lower_bound(__k);}
1492#if _LIBCPP_STD_VER > 11
1493    template <typename _K2>
1494    _LIBCPP_INLINE_VISIBILITY
1495    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
1496    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
1497
1498    template <typename _K2>
1499    _LIBCPP_INLINE_VISIBILITY
1500    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
1501    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
1502#endif
1503
1504    _LIBCPP_INLINE_VISIBILITY
1505    iterator upper_bound(const key_type& __k)
1506        {return __tree_.upper_bound(__k);}
1507    _LIBCPP_INLINE_VISIBILITY
1508    const_iterator upper_bound(const key_type& __k) const
1509        {return __tree_.upper_bound(__k);}
1510#if _LIBCPP_STD_VER > 11
1511    template <typename _K2>
1512    _LIBCPP_INLINE_VISIBILITY
1513    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
1514    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
1515    template <typename _K2>
1516    _LIBCPP_INLINE_VISIBILITY
1517    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
1518    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
1519#endif
1520
1521    _LIBCPP_INLINE_VISIBILITY
1522    pair<iterator,iterator> equal_range(const key_type& __k)
1523        {return __tree_.__equal_range_unique(__k);}
1524    _LIBCPP_INLINE_VISIBILITY
1525    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
1526        {return __tree_.__equal_range_unique(__k);}
1527#if _LIBCPP_STD_VER > 11
1528    template <typename _K2>
1529    _LIBCPP_INLINE_VISIBILITY
1530    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
1531    equal_range(const _K2& __k)       {return __tree_.__equal_range_multi(__k);}
1532    template <typename _K2>
1533    _LIBCPP_INLINE_VISIBILITY
1534    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
1535    equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
1536#endif
1537
1538private:
1539    typedef typename __base::__node                    __node;
1540    typedef typename __base::__node_allocator          __node_allocator;
1541    typedef typename __base::__node_pointer            __node_pointer;
1542    typedef typename __base::__node_base_pointer       __node_base_pointer;
1543    typedef typename __base::__parent_pointer          __parent_pointer;
1544
1545    typedef __map_node_destructor<__node_allocator> _Dp;
1546    typedef unique_ptr<__node, _Dp> __node_holder;
1547
1548#ifdef _LIBCPP_CXX03_LANG
1549    __node_holder __construct_node_with_key(const key_type& __k);
1550#endif
1551};
1552
1553#if _LIBCPP_STD_VER >= 17
1554template<class _InputIterator, class _Compare = less<__iter_key_type<_InputIterator>>,
1555         class _Allocator = allocator<__iter_to_alloc_type<_InputIterator>>,
1556         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
1557         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
1558         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1559map(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator())
1560  -> map<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>, _Compare, _Allocator>;
1561
1562template<class _Key, class _Tp, class _Compare = less<remove_const_t<_Key>>,
1563         class _Allocator = allocator<pair<const _Key, _Tp>>,
1564         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
1565         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1566map(initializer_list<pair<_Key, _Tp>>, _Compare = _Compare(), _Allocator = _Allocator())
1567  -> map<remove_const_t<_Key>, _Tp, _Compare, _Allocator>;
1568
1569template<class _InputIterator, class _Allocator,
1570         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
1571         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1572map(_InputIterator, _InputIterator, _Allocator)
1573  -> map<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>,
1574         less<__iter_key_type<_InputIterator>>, _Allocator>;
1575
1576template<class _Key, class _Tp, class _Allocator,
1577         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1578map(initializer_list<pair<_Key, _Tp>>, _Allocator)
1579  -> map<remove_const_t<_Key>, _Tp, less<remove_const_t<_Key>>, _Allocator>;
1580#endif
1581
1582#ifndef _LIBCPP_CXX03_LANG
1583template <class _Key, class _Tp, class _Compare, class _Allocator>
1584map<_Key, _Tp, _Compare, _Allocator>::map(map&& __m, const allocator_type& __a)
1585    : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
1586{
1587    if (__a != __m.get_allocator())
1588    {
1589        const_iterator __e = cend();
1590        while (!__m.empty())
1591            __tree_.__insert_unique(__e.__i_,
1592                    __m.__tree_.remove(__m.begin().__i_)->__value_.__move());
1593    }
1594}
1595
1596template <class _Key, class _Tp, class _Compare, class _Allocator>
1597_Tp&
1598map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
1599{
1600    return __tree_.__emplace_unique_key_args(__k,
1601        _VSTD::piecewise_construct,
1602        _VSTD::forward_as_tuple(__k),
1603        _VSTD::forward_as_tuple()).first->__get_value().second;
1604}
1605
1606template <class _Key, class _Tp, class _Compare, class _Allocator>
1607_Tp&
1608map<_Key, _Tp, _Compare, _Allocator>::operator[](key_type&& __k)
1609{
1610    return __tree_.__emplace_unique_key_args(__k,
1611        _VSTD::piecewise_construct,
1612        _VSTD::forward_as_tuple(_VSTD::move(__k)),
1613        _VSTD::forward_as_tuple()).first->__get_value().second;
1614}
1615
1616#else // _LIBCPP_CXX03_LANG
1617
1618template <class _Key, class _Tp, class _Compare, class _Allocator>
1619typename map<_Key, _Tp, _Compare, _Allocator>::__node_holder
1620map<_Key, _Tp, _Compare, _Allocator>::__construct_node_with_key(const key_type& __k)
1621{
1622    __node_allocator& __na = __tree_.__node_alloc();
1623    __node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));
1624    __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__get_value().first), __k);
1625    __h.get_deleter().__first_constructed = true;
1626    __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__get_value().second));
1627    __h.get_deleter().__second_constructed = true;
1628    return __h;
1629}
1630
1631template <class _Key, class _Tp, class _Compare, class _Allocator>
1632_Tp&
1633map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
1634{
1635    __parent_pointer __parent;
1636    __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
1637    __node_pointer __r = static_cast<__node_pointer>(__child);
1638    if (__child == nullptr)
1639    {
1640        __node_holder __h = __construct_node_with_key(__k);
1641        __tree_.__insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
1642        __r = __h.release();
1643    }
1644    return __r->__value_.__get_value().second;
1645}
1646
1647#endif // _LIBCPP_CXX03_LANG
1648
1649template <class _Key, class _Tp, class _Compare, class _Allocator>
1650_Tp&
1651map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k)
1652{
1653    __parent_pointer __parent;
1654    __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
1655    if (__child == nullptr)
1656        __throw_out_of_range("map::at:  key not found");
1657    return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
1658}
1659
1660template <class _Key, class _Tp, class _Compare, class _Allocator>
1661const _Tp&
1662map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k) const
1663{
1664    __parent_pointer __parent;
1665    __node_base_pointer __child = __tree_.__find_equal(__parent, __k);
1666    if (__child == nullptr)
1667        __throw_out_of_range("map::at:  key not found");
1668    return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
1669}
1670
1671
1672template <class _Key, class _Tp, class _Compare, class _Allocator>
1673inline _LIBCPP_INLINE_VISIBILITY
1674bool
1675operator==(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1676           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1677{
1678    return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
1679}
1680
1681template <class _Key, class _Tp, class _Compare, class _Allocator>
1682inline _LIBCPP_INLINE_VISIBILITY
1683bool
1684operator< (const map<_Key, _Tp, _Compare, _Allocator>& __x,
1685           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1686{
1687    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
1688}
1689
1690template <class _Key, class _Tp, class _Compare, class _Allocator>
1691inline _LIBCPP_INLINE_VISIBILITY
1692bool
1693operator!=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1694           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1695{
1696    return !(__x == __y);
1697}
1698
1699template <class _Key, class _Tp, class _Compare, class _Allocator>
1700inline _LIBCPP_INLINE_VISIBILITY
1701bool
1702operator> (const map<_Key, _Tp, _Compare, _Allocator>& __x,
1703           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1704{
1705    return __y < __x;
1706}
1707
1708template <class _Key, class _Tp, class _Compare, class _Allocator>
1709inline _LIBCPP_INLINE_VISIBILITY
1710bool
1711operator>=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1712           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1713{
1714    return !(__x < __y);
1715}
1716
1717template <class _Key, class _Tp, class _Compare, class _Allocator>
1718inline _LIBCPP_INLINE_VISIBILITY
1719bool
1720operator<=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1721           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1722{
1723    return !(__y < __x);
1724}
1725
1726template <class _Key, class _Tp, class _Compare, class _Allocator>
1727inline _LIBCPP_INLINE_VISIBILITY
1728void
1729swap(map<_Key, _Tp, _Compare, _Allocator>& __x,
1730     map<_Key, _Tp, _Compare, _Allocator>& __y)
1731    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
1732{
1733    __x.swap(__y);
1734}
1735
1736#if _LIBCPP_STD_VER > 17
1737template <class _Key, class _Tp, class _Compare, class _Allocator,
1738          class _Predicate>
1739inline _LIBCPP_INLINE_VISIBILITY
1740    typename map<_Key, _Tp, _Compare, _Allocator>::size_type
1741    erase_if(map<_Key, _Tp, _Compare, _Allocator>& __c, _Predicate __pred) {
1742  return _VSTD::__libcpp_erase_if_container(__c, __pred);
1743}
1744#endif
1745
1746
1747template <class _Key, class _Tp, class _Compare = less<_Key>,
1748          class _Allocator = allocator<pair<const _Key, _Tp> > >
1749class _LIBCPP_TEMPLATE_VIS multimap
1750{
1751public:
1752    // types:
1753    typedef _Key                                     key_type;
1754    typedef _Tp                                      mapped_type;
1755    typedef pair<const key_type, mapped_type>        value_type;
1756    typedef __type_identity_t<_Compare>              key_compare;
1757    typedef __type_identity_t<_Allocator>            allocator_type;
1758    typedef value_type&                              reference;
1759    typedef const value_type&                        const_reference;
1760
1761    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
1762                  "Allocator::value_type must be same type as value_type");
1763
1764    class _LIBCPP_TEMPLATE_VIS value_compare
1765        : public __binary_function<value_type, value_type, bool>
1766    {
1767        friend class multimap;
1768    protected:
1769        key_compare comp;
1770
1771        _LIBCPP_INLINE_VISIBILITY
1772        value_compare(key_compare c) : comp(c) {}
1773    public:
1774        _LIBCPP_INLINE_VISIBILITY
1775        bool operator()(const value_type& __x, const value_type& __y) const
1776            {return comp(__x.first, __y.first);}
1777    };
1778
1779private:
1780
1781    typedef _VSTD::__value_type<key_type, mapped_type>             __value_type;
1782    typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
1783    typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
1784                                                 __value_type>::type __allocator_type;
1785    typedef __tree<__value_type, __vc, __allocator_type>            __base;
1786    typedef typename __base::__node_traits                          __node_traits;
1787    typedef allocator_traits<allocator_type>                        __alloc_traits;
1788
1789    __base __tree_;
1790
1791public:
1792    typedef typename __alloc_traits::pointer               pointer;
1793    typedef typename __alloc_traits::const_pointer         const_pointer;
1794    typedef typename __alloc_traits::size_type             size_type;
1795    typedef typename __alloc_traits::difference_type       difference_type;
1796    typedef __map_iterator<typename __base::iterator>      iterator;
1797    typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
1798    typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
1799    typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
1800
1801#if _LIBCPP_STD_VER > 14
1802    typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
1803#endif
1804
1805    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1806        friend class _LIBCPP_TEMPLATE_VIS map;
1807    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1808        friend class _LIBCPP_TEMPLATE_VIS multimap;
1809
1810    _LIBCPP_INLINE_VISIBILITY
1811    multimap()
1812        _NOEXCEPT_(
1813            is_nothrow_default_constructible<allocator_type>::value &&
1814            is_nothrow_default_constructible<key_compare>::value &&
1815            is_nothrow_copy_constructible<key_compare>::value)
1816        : __tree_(__vc(key_compare())) {}
1817
1818    _LIBCPP_INLINE_VISIBILITY
1819    explicit multimap(const key_compare& __comp)
1820        _NOEXCEPT_(
1821            is_nothrow_default_constructible<allocator_type>::value &&
1822            is_nothrow_copy_constructible<key_compare>::value)
1823        : __tree_(__vc(__comp)) {}
1824
1825    _LIBCPP_INLINE_VISIBILITY
1826    explicit multimap(const key_compare& __comp, const allocator_type& __a)
1827        : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}
1828
1829    template <class _InputIterator>
1830        _LIBCPP_INLINE_VISIBILITY
1831        multimap(_InputIterator __f, _InputIterator __l,
1832            const key_compare& __comp = key_compare())
1833        : __tree_(__vc(__comp))
1834        {
1835            insert(__f, __l);
1836        }
1837
1838    template <class _InputIterator>
1839        _LIBCPP_INLINE_VISIBILITY
1840        multimap(_InputIterator __f, _InputIterator __l,
1841            const key_compare& __comp, const allocator_type& __a)
1842        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1843        {
1844            insert(__f, __l);
1845        }
1846
1847#if _LIBCPP_STD_VER > 11
1848    template <class _InputIterator>
1849    _LIBCPP_INLINE_VISIBILITY
1850    multimap(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
1851        : multimap(__f, __l, key_compare(), __a) {}
1852#endif
1853
1854    _LIBCPP_INLINE_VISIBILITY
1855    multimap(const multimap& __m)
1856        : __tree_(__m.__tree_.value_comp(),
1857          __alloc_traits::select_on_container_copy_construction(__m.__tree_.__alloc()))
1858        {
1859            insert(__m.begin(), __m.end());
1860        }
1861
1862    _LIBCPP_INLINE_VISIBILITY
1863    multimap& operator=(const multimap& __m)
1864        {
1865#ifndef _LIBCPP_CXX03_LANG
1866            __tree_ = __m.__tree_;
1867#else
1868            if (this != _VSTD::addressof(__m)) {
1869                __tree_.clear();
1870                __tree_.value_comp() = __m.__tree_.value_comp();
1871                __tree_.__copy_assign_alloc(__m.__tree_);
1872                insert(__m.begin(), __m.end());
1873            }
1874#endif
1875            return *this;
1876        }
1877
1878#ifndef _LIBCPP_CXX03_LANG
1879
1880    _LIBCPP_INLINE_VISIBILITY
1881    multimap(multimap&& __m)
1882        _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
1883        : __tree_(_VSTD::move(__m.__tree_))
1884        {
1885        }
1886
1887    multimap(multimap&& __m, const allocator_type& __a);
1888
1889    _LIBCPP_INLINE_VISIBILITY
1890    multimap& operator=(multimap&& __m)
1891        _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
1892        {
1893            __tree_ = _VSTD::move(__m.__tree_);
1894            return *this;
1895        }
1896
1897    _LIBCPP_INLINE_VISIBILITY
1898    multimap(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
1899        : __tree_(__vc(__comp))
1900        {
1901            insert(__il.begin(), __il.end());
1902        }
1903
1904    _LIBCPP_INLINE_VISIBILITY
1905    multimap(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
1906        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1907        {
1908            insert(__il.begin(), __il.end());
1909        }
1910
1911#if _LIBCPP_STD_VER > 11
1912    _LIBCPP_INLINE_VISIBILITY
1913    multimap(initializer_list<value_type> __il, const allocator_type& __a)
1914        : multimap(__il, key_compare(), __a) {}
1915#endif
1916
1917    _LIBCPP_INLINE_VISIBILITY
1918    multimap& operator=(initializer_list<value_type> __il)
1919        {
1920            __tree_.__assign_multi(__il.begin(), __il.end());
1921            return *this;
1922        }
1923
1924#endif // _LIBCPP_CXX03_LANG
1925
1926    _LIBCPP_INLINE_VISIBILITY
1927    explicit multimap(const allocator_type& __a)
1928        : __tree_(typename __base::allocator_type(__a))
1929        {
1930        }
1931
1932    _LIBCPP_INLINE_VISIBILITY
1933    multimap(const multimap& __m, const allocator_type& __a)
1934        : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
1935        {
1936            insert(__m.begin(), __m.end());
1937        }
1938
1939    _LIBCPP_INLINE_VISIBILITY
1940    ~multimap() {
1941        static_assert(sizeof(__diagnose_non_const_comparator<_Key, _Compare>()), "");
1942    }
1943
1944    _LIBCPP_INLINE_VISIBILITY
1945          iterator begin() _NOEXCEPT {return __tree_.begin();}
1946    _LIBCPP_INLINE_VISIBILITY
1947    const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
1948    _LIBCPP_INLINE_VISIBILITY
1949          iterator end() _NOEXCEPT {return __tree_.end();}
1950    _LIBCPP_INLINE_VISIBILITY
1951    const_iterator end() const _NOEXCEPT {return __tree_.end();}
1952
1953    _LIBCPP_INLINE_VISIBILITY
1954          reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
1955    _LIBCPP_INLINE_VISIBILITY
1956    const_reverse_iterator rbegin() const _NOEXCEPT
1957        {return const_reverse_iterator(end());}
1958    _LIBCPP_INLINE_VISIBILITY
1959          reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
1960    _LIBCPP_INLINE_VISIBILITY
1961    const_reverse_iterator rend() const _NOEXCEPT
1962        {return const_reverse_iterator(begin());}
1963
1964    _LIBCPP_INLINE_VISIBILITY
1965    const_iterator cbegin()  const _NOEXCEPT {return begin();}
1966    _LIBCPP_INLINE_VISIBILITY
1967    const_iterator cend() const _NOEXCEPT {return end();}
1968    _LIBCPP_INLINE_VISIBILITY
1969    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
1970    _LIBCPP_INLINE_VISIBILITY
1971    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
1972
1973    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1974    bool empty() const _NOEXCEPT {return __tree_.size() == 0;}
1975    _LIBCPP_INLINE_VISIBILITY
1976    size_type size() const _NOEXCEPT {return __tree_.size();}
1977    _LIBCPP_INLINE_VISIBILITY
1978    size_type max_size() const _NOEXCEPT {return __tree_.max_size();}
1979
1980    _LIBCPP_INLINE_VISIBILITY
1981    allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
1982    _LIBCPP_INLINE_VISIBILITY
1983    key_compare    key_comp() const {return __tree_.value_comp().key_comp();}
1984    _LIBCPP_INLINE_VISIBILITY
1985    value_compare  value_comp() const
1986        {return value_compare(__tree_.value_comp().key_comp());}
1987
1988#ifndef _LIBCPP_CXX03_LANG
1989
1990    template <class ..._Args>
1991    _LIBCPP_INLINE_VISIBILITY
1992    iterator emplace(_Args&& ...__args) {
1993        return __tree_.__emplace_multi(_VSTD::forward<_Args>(__args)...);
1994    }
1995
1996    template <class ..._Args>
1997    _LIBCPP_INLINE_VISIBILITY
1998    iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
1999        return __tree_.__emplace_hint_multi(__p.__i_, _VSTD::forward<_Args>(__args)...);
2000    }
2001
2002    template <class _Pp,
2003              class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
2004        _LIBCPP_INLINE_VISIBILITY
2005        iterator insert(_Pp&& __p)
2006            {return __tree_.__insert_multi(_VSTD::forward<_Pp>(__p));}
2007
2008    template <class _Pp,
2009              class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
2010        _LIBCPP_INLINE_VISIBILITY
2011        iterator insert(const_iterator __pos, _Pp&& __p)
2012            {return __tree_.__insert_multi(__pos.__i_, _VSTD::forward<_Pp>(__p));}
2013
2014    _LIBCPP_INLINE_VISIBILITY
2015    iterator insert(value_type&& __v)
2016        {return __tree_.__insert_multi(_VSTD::move(__v));}
2017
2018    _LIBCPP_INLINE_VISIBILITY
2019    iterator insert(const_iterator __p, value_type&& __v)
2020        {return __tree_.__insert_multi(__p.__i_, _VSTD::move(__v));}
2021
2022
2023    _LIBCPP_INLINE_VISIBILITY
2024    void insert(initializer_list<value_type> __il)
2025        {insert(__il.begin(), __il.end());}
2026
2027#endif // _LIBCPP_CXX03_LANG
2028
2029    _LIBCPP_INLINE_VISIBILITY
2030    iterator insert(const value_type& __v) {return __tree_.__insert_multi(__v);}
2031
2032    _LIBCPP_INLINE_VISIBILITY
2033    iterator insert(const_iterator __p, const value_type& __v)
2034            {return __tree_.__insert_multi(__p.__i_, __v);}
2035
2036    template <class _InputIterator>
2037        _LIBCPP_INLINE_VISIBILITY
2038        void insert(_InputIterator __f, _InputIterator __l)
2039        {
2040            for (const_iterator __e = cend(); __f != __l; ++__f)
2041                __tree_.__insert_multi(__e.__i_, *__f);
2042        }
2043
2044    _LIBCPP_INLINE_VISIBILITY
2045    iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
2046    _LIBCPP_INLINE_VISIBILITY
2047    iterator erase(iterator __p)       {return __tree_.erase(__p.__i_);}
2048    _LIBCPP_INLINE_VISIBILITY
2049    size_type erase(const key_type& __k) {return __tree_.__erase_multi(__k);}
2050    _LIBCPP_INLINE_VISIBILITY
2051    iterator  erase(const_iterator __f, const_iterator __l)
2052        {return __tree_.erase(__f.__i_, __l.__i_);}
2053
2054#if _LIBCPP_STD_VER > 14
2055    _LIBCPP_INLINE_VISIBILITY
2056    iterator insert(node_type&& __nh)
2057    {
2058        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
2059            "node_type with incompatible allocator passed to multimap::insert()");
2060        return __tree_.template __node_handle_insert_multi<node_type>(
2061            _VSTD::move(__nh));
2062    }
2063    _LIBCPP_INLINE_VISIBILITY
2064    iterator insert(const_iterator __hint, node_type&& __nh)
2065    {
2066        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
2067            "node_type with incompatible allocator passed to multimap::insert()");
2068        return __tree_.template __node_handle_insert_multi<node_type>(
2069            __hint.__i_, _VSTD::move(__nh));
2070    }
2071    _LIBCPP_INLINE_VISIBILITY
2072    node_type extract(key_type const& __key)
2073    {
2074        return __tree_.template __node_handle_extract<node_type>(__key);
2075    }
2076    _LIBCPP_INLINE_VISIBILITY
2077    node_type extract(const_iterator __it)
2078    {
2079        return __tree_.template __node_handle_extract<node_type>(
2080            __it.__i_);
2081    }
2082    template <class _Compare2>
2083    _LIBCPP_INLINE_VISIBILITY
2084    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
2085    {
2086        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2087                       "merging container with incompatible allocator");
2088        return __tree_.__node_handle_merge_multi(__source.__tree_);
2089    }
2090    template <class _Compare2>
2091    _LIBCPP_INLINE_VISIBILITY
2092    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
2093    {
2094        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2095                       "merging container with incompatible allocator");
2096        return __tree_.__node_handle_merge_multi(__source.__tree_);
2097    }
2098    template <class _Compare2>
2099    _LIBCPP_INLINE_VISIBILITY
2100    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
2101    {
2102        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2103                       "merging container with incompatible allocator");
2104        return __tree_.__node_handle_merge_multi(__source.__tree_);
2105    }
2106    template <class _Compare2>
2107    _LIBCPP_INLINE_VISIBILITY
2108    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
2109    {
2110        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2111                       "merging container with incompatible allocator");
2112        return __tree_.__node_handle_merge_multi(__source.__tree_);
2113    }
2114#endif
2115
2116    _LIBCPP_INLINE_VISIBILITY
2117    void clear() _NOEXCEPT {__tree_.clear();}
2118
2119    _LIBCPP_INLINE_VISIBILITY
2120    void swap(multimap& __m)
2121        _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
2122        {__tree_.swap(__m.__tree_);}
2123
2124    _LIBCPP_INLINE_VISIBILITY
2125    iterator find(const key_type& __k)             {return __tree_.find(__k);}
2126    _LIBCPP_INLINE_VISIBILITY
2127    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
2128#if _LIBCPP_STD_VER > 11
2129    template <typename _K2>
2130    _LIBCPP_INLINE_VISIBILITY
2131    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
2132    find(const _K2& __k)                           {return __tree_.find(__k);}
2133    template <typename _K2>
2134    _LIBCPP_INLINE_VISIBILITY
2135    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
2136    find(const _K2& __k) const                     {return __tree_.find(__k);}
2137#endif
2138
2139    _LIBCPP_INLINE_VISIBILITY
2140    size_type      count(const key_type& __k) const
2141        {return __tree_.__count_multi(__k);}
2142#if _LIBCPP_STD_VER > 11
2143    template <typename _K2>
2144    _LIBCPP_INLINE_VISIBILITY
2145    typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
2146    count(const _K2& __k) const {return __tree_.__count_multi(__k);}
2147#endif
2148
2149#if _LIBCPP_STD_VER > 17
2150    _LIBCPP_INLINE_VISIBILITY
2151    bool contains(const key_type& __k) const {return find(__k) != end();}
2152    template <typename _K2>
2153    _LIBCPP_INLINE_VISIBILITY
2154    typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
2155    contains(const _K2& __k) const { return find(__k) != end(); }
2156#endif // _LIBCPP_STD_VER > 17
2157
2158    _LIBCPP_INLINE_VISIBILITY
2159    iterator lower_bound(const key_type& __k)
2160        {return __tree_.lower_bound(__k);}
2161    _LIBCPP_INLINE_VISIBILITY
2162    const_iterator lower_bound(const key_type& __k) const
2163            {return __tree_.lower_bound(__k);}
2164#if _LIBCPP_STD_VER > 11
2165    template <typename _K2>
2166    _LIBCPP_INLINE_VISIBILITY
2167    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
2168    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
2169
2170    template <typename _K2>
2171    _LIBCPP_INLINE_VISIBILITY
2172    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
2173    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
2174#endif
2175
2176    _LIBCPP_INLINE_VISIBILITY
2177    iterator upper_bound(const key_type& __k)
2178            {return __tree_.upper_bound(__k);}
2179    _LIBCPP_INLINE_VISIBILITY
2180    const_iterator upper_bound(const key_type& __k) const
2181            {return __tree_.upper_bound(__k);}
2182#if _LIBCPP_STD_VER > 11
2183    template <typename _K2>
2184    _LIBCPP_INLINE_VISIBILITY
2185    typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
2186    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
2187    template <typename _K2>
2188    _LIBCPP_INLINE_VISIBILITY
2189    typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
2190    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
2191#endif
2192
2193    _LIBCPP_INLINE_VISIBILITY
2194    pair<iterator,iterator>             equal_range(const key_type& __k)
2195            {return __tree_.__equal_range_multi(__k);}
2196    _LIBCPP_INLINE_VISIBILITY
2197    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
2198            {return __tree_.__equal_range_multi(__k);}
2199#if _LIBCPP_STD_VER > 11
2200    template <typename _K2>
2201    _LIBCPP_INLINE_VISIBILITY
2202    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
2203    equal_range(const _K2& __k)       {return __tree_.__equal_range_multi(__k);}
2204    template <typename _K2>
2205    _LIBCPP_INLINE_VISIBILITY
2206    typename enable_if<__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
2207    equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
2208#endif
2209
2210private:
2211    typedef typename __base::__node                    __node;
2212    typedef typename __base::__node_allocator          __node_allocator;
2213    typedef typename __base::__node_pointer            __node_pointer;
2214
2215    typedef __map_node_destructor<__node_allocator> _Dp;
2216    typedef unique_ptr<__node, _Dp> __node_holder;
2217};
2218
2219#if _LIBCPP_STD_VER >= 17
2220template<class _InputIterator, class _Compare = less<__iter_key_type<_InputIterator>>,
2221         class _Allocator = allocator<__iter_to_alloc_type<_InputIterator>>,
2222         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
2223         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
2224         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2225multimap(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator())
2226  -> multimap<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>, _Compare, _Allocator>;
2227
2228template<class _Key, class _Tp, class _Compare = less<remove_const_t<_Key>>,
2229         class _Allocator = allocator<pair<const _Key, _Tp>>,
2230         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
2231         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2232multimap(initializer_list<pair<_Key, _Tp>>, _Compare = _Compare(), _Allocator = _Allocator())
2233  -> multimap<remove_const_t<_Key>, _Tp, _Compare, _Allocator>;
2234
2235template<class _InputIterator, class _Allocator,
2236         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
2237         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2238multimap(_InputIterator, _InputIterator, _Allocator)
2239  -> multimap<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>,
2240         less<__iter_key_type<_InputIterator>>, _Allocator>;
2241
2242template<class _Key, class _Tp, class _Allocator,
2243         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2244multimap(initializer_list<pair<_Key, _Tp>>, _Allocator)
2245  -> multimap<remove_const_t<_Key>, _Tp, less<remove_const_t<_Key>>, _Allocator>;
2246#endif
2247
2248#ifndef _LIBCPP_CXX03_LANG
2249template <class _Key, class _Tp, class _Compare, class _Allocator>
2250multimap<_Key, _Tp, _Compare, _Allocator>::multimap(multimap&& __m, const allocator_type& __a)
2251    : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
2252{
2253    if (__a != __m.get_allocator())
2254    {
2255        const_iterator __e = cend();
2256        while (!__m.empty())
2257            __tree_.__insert_multi(__e.__i_,
2258                    _VSTD::move(__m.__tree_.remove(__m.begin().__i_)->__value_.__move()));
2259    }
2260}
2261#endif
2262
2263template <class _Key, class _Tp, class _Compare, class _Allocator>
2264inline _LIBCPP_INLINE_VISIBILITY
2265bool
2266operator==(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2267           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2268{
2269    return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
2270}
2271
2272template <class _Key, class _Tp, class _Compare, class _Allocator>
2273inline _LIBCPP_INLINE_VISIBILITY
2274bool
2275operator< (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2276           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2277{
2278    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
2279}
2280
2281template <class _Key, class _Tp, class _Compare, class _Allocator>
2282inline _LIBCPP_INLINE_VISIBILITY
2283bool
2284operator!=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2285           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2286{
2287    return !(__x == __y);
2288}
2289
2290template <class _Key, class _Tp, class _Compare, class _Allocator>
2291inline _LIBCPP_INLINE_VISIBILITY
2292bool
2293operator> (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2294           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2295{
2296    return __y < __x;
2297}
2298
2299template <class _Key, class _Tp, class _Compare, class _Allocator>
2300inline _LIBCPP_INLINE_VISIBILITY
2301bool
2302operator>=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2303           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2304{
2305    return !(__x < __y);
2306}
2307
2308template <class _Key, class _Tp, class _Compare, class _Allocator>
2309inline _LIBCPP_INLINE_VISIBILITY
2310bool
2311operator<=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2312           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2313{
2314    return !(__y < __x);
2315}
2316
2317template <class _Key, class _Tp, class _Compare, class _Allocator>
2318inline _LIBCPP_INLINE_VISIBILITY
2319void
2320swap(multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2321     multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2322    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
2323{
2324    __x.swap(__y);
2325}
2326
2327#if _LIBCPP_STD_VER > 17
2328template <class _Key, class _Tp, class _Compare, class _Allocator,
2329          class _Predicate>
2330inline _LIBCPP_INLINE_VISIBILITY
2331    typename multimap<_Key, _Tp, _Compare, _Allocator>::size_type
2332    erase_if(multimap<_Key, _Tp, _Compare, _Allocator>& __c,
2333             _Predicate __pred) {
2334  return _VSTD::__libcpp_erase_if_container(__c, __pred);
2335}
2336#endif
2337
2338_LIBCPP_END_NAMESPACE_STD
2339
2340#endif // _LIBCPP_MAP
2341