xref: /freebsd/contrib/llvm-project/libcxx/include/map (revision fcaf7f8644a9988098ac6be2165bce3ea4786e91)
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 = __enable_if_t<__is_same_uncvref<_ValueTp, value_type>::value>
796             >
797    _LIBCPP_INLINE_VISIBILITY
798    __value_type& operator=(_ValueTp&& __v)
799    {
800        __ref() = _VSTD::forward<_ValueTp>(__v);
801        return *this;
802    }
803
804private:
805    __value_type() = delete;
806    ~__value_type() = delete;
807    __value_type(const __value_type&) = delete;
808    __value_type(__value_type&&) = delete;
809};
810
811#else
812
813template <class _Key, class _Tp>
814struct __value_type
815{
816    typedef _Key                                     key_type;
817    typedef _Tp                                      mapped_type;
818    typedef pair<const key_type, mapped_type>        value_type;
819
820private:
821    value_type __cc;
822
823public:
824    _LIBCPP_INLINE_VISIBILITY
825    value_type& __get_value() { return __cc; }
826    _LIBCPP_INLINE_VISIBILITY
827    const value_type& __get_value() const { return __cc; }
828
829private:
830   __value_type();
831   __value_type(__value_type const&);
832   __value_type& operator=(__value_type const&);
833   ~__value_type();
834};
835
836#endif // _LIBCPP_CXX03_LANG
837
838template <class _Tp>
839struct __extract_key_value_types;
840
841template <class _Key, class _Tp>
842struct __extract_key_value_types<__value_type<_Key, _Tp> >
843{
844  typedef _Key const __key_type;
845  typedef _Tp        __mapped_type;
846};
847
848template <class _TreeIterator>
849class _LIBCPP_TEMPLATE_VIS __map_iterator
850{
851    typedef typename _TreeIterator::_NodeTypes                   _NodeTypes;
852    typedef typename _TreeIterator::__pointer_traits             __pointer_traits;
853
854    _TreeIterator __i_;
855
856public:
857    typedef bidirectional_iterator_tag                           iterator_category;
858    typedef typename _NodeTypes::__map_value_type                value_type;
859    typedef typename _TreeIterator::difference_type              difference_type;
860    typedef value_type&                                          reference;
861    typedef typename _NodeTypes::__map_value_type_pointer        pointer;
862
863    _LIBCPP_INLINE_VISIBILITY
864    __map_iterator() _NOEXCEPT {}
865
866    _LIBCPP_INLINE_VISIBILITY
867    __map_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}
868
869    _LIBCPP_INLINE_VISIBILITY
870    reference operator*() const {return __i_->__get_value();}
871    _LIBCPP_INLINE_VISIBILITY
872    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__get_value());}
873
874    _LIBCPP_INLINE_VISIBILITY
875    __map_iterator& operator++() {++__i_; return *this;}
876    _LIBCPP_INLINE_VISIBILITY
877    __map_iterator operator++(int)
878    {
879        __map_iterator __t(*this);
880        ++(*this);
881        return __t;
882    }
883
884    _LIBCPP_INLINE_VISIBILITY
885    __map_iterator& operator--() {--__i_; return *this;}
886    _LIBCPP_INLINE_VISIBILITY
887    __map_iterator operator--(int)
888    {
889        __map_iterator __t(*this);
890        --(*this);
891        return __t;
892    }
893
894    friend _LIBCPP_INLINE_VISIBILITY
895    bool operator==(const __map_iterator& __x, const __map_iterator& __y)
896        {return __x.__i_ == __y.__i_;}
897    friend
898    _LIBCPP_INLINE_VISIBILITY
899    bool operator!=(const __map_iterator& __x, const __map_iterator& __y)
900        {return __x.__i_ != __y.__i_;}
901
902    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
903    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
904    template <class> friend class _LIBCPP_TEMPLATE_VIS __map_const_iterator;
905};
906
907template <class _TreeIterator>
908class _LIBCPP_TEMPLATE_VIS __map_const_iterator
909{
910    typedef typename _TreeIterator::_NodeTypes                   _NodeTypes;
911    typedef typename _TreeIterator::__pointer_traits             __pointer_traits;
912
913    _TreeIterator __i_;
914
915public:
916    typedef bidirectional_iterator_tag                           iterator_category;
917    typedef typename _NodeTypes::__map_value_type                value_type;
918    typedef typename _TreeIterator::difference_type              difference_type;
919    typedef const value_type&                                    reference;
920    typedef typename _NodeTypes::__const_map_value_type_pointer  pointer;
921
922    _LIBCPP_INLINE_VISIBILITY
923    __map_const_iterator() _NOEXCEPT {}
924
925    _LIBCPP_INLINE_VISIBILITY
926    __map_const_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}
927    _LIBCPP_INLINE_VISIBILITY
928    __map_const_iterator(__map_iterator<
929        typename _TreeIterator::__non_const_iterator> __i) _NOEXCEPT
930        : __i_(__i.__i_) {}
931
932    _LIBCPP_INLINE_VISIBILITY
933    reference operator*() const {return __i_->__get_value();}
934    _LIBCPP_INLINE_VISIBILITY
935    pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__get_value());}
936
937    _LIBCPP_INLINE_VISIBILITY
938    __map_const_iterator& operator++() {++__i_; return *this;}
939    _LIBCPP_INLINE_VISIBILITY
940    __map_const_iterator operator++(int)
941    {
942        __map_const_iterator __t(*this);
943        ++(*this);
944        return __t;
945    }
946
947    _LIBCPP_INLINE_VISIBILITY
948    __map_const_iterator& operator--() {--__i_; return *this;}
949    _LIBCPP_INLINE_VISIBILITY
950    __map_const_iterator operator--(int)
951    {
952        __map_const_iterator __t(*this);
953        --(*this);
954        return __t;
955    }
956
957    friend _LIBCPP_INLINE_VISIBILITY
958    bool operator==(const __map_const_iterator& __x, const __map_const_iterator& __y)
959        {return __x.__i_ == __y.__i_;}
960    friend _LIBCPP_INLINE_VISIBILITY
961    bool operator!=(const __map_const_iterator& __x, const __map_const_iterator& __y)
962        {return __x.__i_ != __y.__i_;}
963
964    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
965    template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
966    template <class, class, class> friend class _LIBCPP_TEMPLATE_VIS __tree_const_iterator;
967};
968
969template <class _Key, class _Tp, class _Compare = less<_Key>,
970          class _Allocator = allocator<pair<const _Key, _Tp> > >
971class _LIBCPP_TEMPLATE_VIS map
972{
973public:
974    // types:
975    typedef _Key                                     key_type;
976    typedef _Tp                                      mapped_type;
977    typedef pair<const key_type, mapped_type>        value_type;
978    typedef __type_identity_t<_Compare>              key_compare;
979    typedef __type_identity_t<_Allocator>            allocator_type;
980    typedef value_type&                              reference;
981    typedef const value_type&                        const_reference;
982
983    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
984                  "Allocator::value_type must be same type as value_type");
985
986    class _LIBCPP_TEMPLATE_VIS value_compare
987        : public __binary_function<value_type, value_type, bool>
988    {
989        friend class map;
990    protected:
991        key_compare comp;
992
993        _LIBCPP_INLINE_VISIBILITY value_compare(key_compare __c) : comp(__c) {}
994    public:
995        _LIBCPP_INLINE_VISIBILITY
996        bool operator()(const value_type& __x, const value_type& __y) const
997            {return comp(__x.first, __y.first);}
998    };
999
1000private:
1001
1002    typedef _VSTD::__value_type<key_type, mapped_type>             __value_type;
1003    typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
1004    typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
1005                                                 __value_type>::type __allocator_type;
1006    typedef __tree<__value_type, __vc, __allocator_type>   __base;
1007    typedef typename __base::__node_traits                 __node_traits;
1008    typedef allocator_traits<allocator_type>               __alloc_traits;
1009
1010    __base __tree_;
1011
1012public:
1013    typedef typename __alloc_traits::pointer               pointer;
1014    typedef typename __alloc_traits::const_pointer         const_pointer;
1015    typedef typename __alloc_traits::size_type             size_type;
1016    typedef typename __alloc_traits::difference_type       difference_type;
1017    typedef __map_iterator<typename __base::iterator>             iterator;
1018    typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
1019    typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
1020    typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
1021
1022#if _LIBCPP_STD_VER > 14
1023    typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
1024    typedef __insert_return_type<iterator, node_type> insert_return_type;
1025#endif
1026
1027    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1028        friend class _LIBCPP_TEMPLATE_VIS map;
1029    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1030        friend class _LIBCPP_TEMPLATE_VIS multimap;
1031
1032    _LIBCPP_INLINE_VISIBILITY
1033    map()
1034        _NOEXCEPT_(
1035            is_nothrow_default_constructible<allocator_type>::value &&
1036            is_nothrow_default_constructible<key_compare>::value &&
1037            is_nothrow_copy_constructible<key_compare>::value)
1038        : __tree_(__vc(key_compare())) {}
1039
1040    _LIBCPP_INLINE_VISIBILITY
1041    explicit map(const key_compare& __comp)
1042        _NOEXCEPT_(
1043            is_nothrow_default_constructible<allocator_type>::value &&
1044            is_nothrow_copy_constructible<key_compare>::value)
1045        : __tree_(__vc(__comp)) {}
1046
1047    _LIBCPP_INLINE_VISIBILITY
1048    explicit map(const key_compare& __comp, const allocator_type& __a)
1049        : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}
1050
1051    template <class _InputIterator>
1052    _LIBCPP_INLINE_VISIBILITY
1053        map(_InputIterator __f, _InputIterator __l,
1054            const key_compare& __comp = key_compare())
1055        : __tree_(__vc(__comp))
1056        {
1057            insert(__f, __l);
1058        }
1059
1060    template <class _InputIterator>
1061    _LIBCPP_INLINE_VISIBILITY
1062        map(_InputIterator __f, _InputIterator __l,
1063            const key_compare& __comp, const allocator_type& __a)
1064        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1065        {
1066            insert(__f, __l);
1067        }
1068
1069#if _LIBCPP_STD_VER > 11
1070    template <class _InputIterator>
1071    _LIBCPP_INLINE_VISIBILITY
1072    map(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
1073        : map(__f, __l, key_compare(), __a) {}
1074#endif
1075
1076    _LIBCPP_INLINE_VISIBILITY
1077    map(const map& __m)
1078        : __tree_(__m.__tree_)
1079        {
1080            insert(__m.begin(), __m.end());
1081        }
1082
1083    _LIBCPP_INLINE_VISIBILITY
1084    map& operator=(const map& __m)
1085        {
1086#ifndef _LIBCPP_CXX03_LANG
1087            __tree_ = __m.__tree_;
1088#else
1089            if (this != _VSTD::addressof(__m)) {
1090                __tree_.clear();
1091                __tree_.value_comp() = __m.__tree_.value_comp();
1092                __tree_.__copy_assign_alloc(__m.__tree_);
1093                insert(__m.begin(), __m.end());
1094            }
1095#endif
1096            return *this;
1097        }
1098
1099#ifndef _LIBCPP_CXX03_LANG
1100
1101    _LIBCPP_INLINE_VISIBILITY
1102    map(map&& __m)
1103        _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
1104        : __tree_(_VSTD::move(__m.__tree_))
1105        {
1106        }
1107
1108    map(map&& __m, const allocator_type& __a);
1109
1110    _LIBCPP_INLINE_VISIBILITY
1111    map& operator=(map&& __m)
1112        _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
1113        {
1114            __tree_ = _VSTD::move(__m.__tree_);
1115            return *this;
1116        }
1117
1118    _LIBCPP_INLINE_VISIBILITY
1119    map(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
1120        : __tree_(__vc(__comp))
1121        {
1122            insert(__il.begin(), __il.end());
1123        }
1124
1125    _LIBCPP_INLINE_VISIBILITY
1126    map(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
1127        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1128        {
1129            insert(__il.begin(), __il.end());
1130        }
1131
1132#if _LIBCPP_STD_VER > 11
1133    _LIBCPP_INLINE_VISIBILITY
1134    map(initializer_list<value_type> __il, const allocator_type& __a)
1135        : map(__il, key_compare(), __a) {}
1136#endif
1137
1138    _LIBCPP_INLINE_VISIBILITY
1139    map& operator=(initializer_list<value_type> __il)
1140        {
1141            __tree_.__assign_unique(__il.begin(), __il.end());
1142            return *this;
1143        }
1144
1145#endif // _LIBCPP_CXX03_LANG
1146
1147    _LIBCPP_INLINE_VISIBILITY
1148    explicit map(const allocator_type& __a)
1149        : __tree_(typename __base::allocator_type(__a))
1150        {
1151        }
1152
1153    _LIBCPP_INLINE_VISIBILITY
1154    map(const map& __m, const allocator_type& __a)
1155        : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
1156        {
1157            insert(__m.begin(), __m.end());
1158        }
1159
1160    _LIBCPP_INLINE_VISIBILITY
1161    ~map() {
1162        static_assert(sizeof(__diagnose_non_const_comparator<_Key, _Compare>()), "");
1163    }
1164
1165    _LIBCPP_INLINE_VISIBILITY
1166          iterator begin() _NOEXCEPT {return __tree_.begin();}
1167    _LIBCPP_INLINE_VISIBILITY
1168    const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
1169    _LIBCPP_INLINE_VISIBILITY
1170          iterator end() _NOEXCEPT {return __tree_.end();}
1171    _LIBCPP_INLINE_VISIBILITY
1172    const_iterator end() const _NOEXCEPT {return __tree_.end();}
1173
1174    _LIBCPP_INLINE_VISIBILITY
1175          reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
1176    _LIBCPP_INLINE_VISIBILITY
1177    const_reverse_iterator rbegin() const _NOEXCEPT
1178        {return const_reverse_iterator(end());}
1179    _LIBCPP_INLINE_VISIBILITY
1180          reverse_iterator rend() _NOEXCEPT
1181            {return       reverse_iterator(begin());}
1182    _LIBCPP_INLINE_VISIBILITY
1183    const_reverse_iterator rend() const _NOEXCEPT
1184        {return const_reverse_iterator(begin());}
1185
1186    _LIBCPP_INLINE_VISIBILITY
1187    const_iterator cbegin() const _NOEXCEPT {return begin();}
1188    _LIBCPP_INLINE_VISIBILITY
1189    const_iterator cend() const _NOEXCEPT {return end();}
1190    _LIBCPP_INLINE_VISIBILITY
1191    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
1192    _LIBCPP_INLINE_VISIBILITY
1193    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
1194
1195    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1196    bool      empty() const _NOEXCEPT {return __tree_.size() == 0;}
1197    _LIBCPP_INLINE_VISIBILITY
1198    size_type size() const _NOEXCEPT {return __tree_.size();}
1199    _LIBCPP_INLINE_VISIBILITY
1200    size_type max_size() const _NOEXCEPT {return __tree_.max_size();}
1201
1202    mapped_type& operator[](const key_type& __k);
1203#ifndef _LIBCPP_CXX03_LANG
1204    mapped_type& operator[](key_type&& __k);
1205#endif
1206
1207          mapped_type& at(const key_type& __k);
1208    const mapped_type& at(const key_type& __k) const;
1209
1210    _LIBCPP_INLINE_VISIBILITY
1211    allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
1212    _LIBCPP_INLINE_VISIBILITY
1213    key_compare    key_comp()      const {return __tree_.value_comp().key_comp();}
1214    _LIBCPP_INLINE_VISIBILITY
1215    value_compare  value_comp()    const {return value_compare(__tree_.value_comp().key_comp());}
1216
1217#ifndef _LIBCPP_CXX03_LANG
1218    template <class ..._Args>
1219    _LIBCPP_INLINE_VISIBILITY
1220    pair<iterator, bool> emplace(_Args&& ...__args) {
1221        return __tree_.__emplace_unique(_VSTD::forward<_Args>(__args)...);
1222    }
1223
1224    template <class ..._Args>
1225    _LIBCPP_INLINE_VISIBILITY
1226    iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
1227        return __tree_.__emplace_hint_unique(__p.__i_, _VSTD::forward<_Args>(__args)...);
1228    }
1229
1230    template <class _Pp,
1231              class = __enable_if_t<is_constructible<value_type, _Pp>::value> >
1232        _LIBCPP_INLINE_VISIBILITY
1233        pair<iterator, bool> insert(_Pp&& __p)
1234            {return __tree_.__insert_unique(_VSTD::forward<_Pp>(__p));}
1235
1236    template <class _Pp,
1237              class = __enable_if_t<is_constructible<value_type, _Pp>::value> >
1238        _LIBCPP_INLINE_VISIBILITY
1239        iterator insert(const_iterator __pos, _Pp&& __p)
1240            {return __tree_.__insert_unique(__pos.__i_, _VSTD::forward<_Pp>(__p));}
1241
1242#endif // _LIBCPP_CXX03_LANG
1243
1244    _LIBCPP_INLINE_VISIBILITY
1245    pair<iterator, bool>
1246        insert(const value_type& __v) {return __tree_.__insert_unique(__v);}
1247
1248    _LIBCPP_INLINE_VISIBILITY
1249    iterator
1250        insert(const_iterator __p, const value_type& __v)
1251            {return __tree_.__insert_unique(__p.__i_, __v);}
1252
1253#ifndef _LIBCPP_CXX03_LANG
1254    _LIBCPP_INLINE_VISIBILITY
1255    pair<iterator, bool>
1256    insert(value_type&& __v) {return __tree_.__insert_unique(_VSTD::move(__v));}
1257
1258    _LIBCPP_INLINE_VISIBILITY
1259    iterator insert(const_iterator __p,  value_type&& __v)
1260    {return __tree_.__insert_unique(__p.__i_, _VSTD::move(__v));}
1261
1262    _LIBCPP_INLINE_VISIBILITY
1263    void insert(initializer_list<value_type> __il)
1264        {insert(__il.begin(), __il.end());}
1265#endif
1266
1267    template <class _InputIterator>
1268        _LIBCPP_INLINE_VISIBILITY
1269        void insert(_InputIterator __f, _InputIterator __l)
1270        {
1271            for (const_iterator __e = cend(); __f != __l; ++__f)
1272                insert(__e.__i_, *__f);
1273        }
1274
1275#if _LIBCPP_STD_VER > 14
1276
1277    template <class... _Args>
1278        _LIBCPP_INLINE_VISIBILITY
1279        pair<iterator, bool> try_emplace(const key_type& __k, _Args&&... __args)
1280    {
1281        return __tree_.__emplace_unique_key_args(__k,
1282            _VSTD::piecewise_construct,
1283            _VSTD::forward_as_tuple(__k),
1284            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
1285    }
1286
1287    template <class... _Args>
1288        _LIBCPP_INLINE_VISIBILITY
1289        pair<iterator, bool> try_emplace(key_type&& __k, _Args&&... __args)
1290    {
1291        return __tree_.__emplace_unique_key_args(__k,
1292            _VSTD::piecewise_construct,
1293            _VSTD::forward_as_tuple(_VSTD::move(__k)),
1294            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
1295    }
1296
1297    template <class... _Args>
1298        _LIBCPP_INLINE_VISIBILITY
1299        iterator try_emplace(const_iterator __h, const key_type& __k, _Args&&... __args)
1300    {
1301        return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
1302            _VSTD::piecewise_construct,
1303            _VSTD::forward_as_tuple(__k),
1304            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)).first;
1305    }
1306
1307    template <class... _Args>
1308        _LIBCPP_INLINE_VISIBILITY
1309        iterator try_emplace(const_iterator __h, key_type&& __k, _Args&&... __args)
1310    {
1311        return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
1312            _VSTD::piecewise_construct,
1313            _VSTD::forward_as_tuple(_VSTD::move(__k)),
1314            _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...)).first;
1315    }
1316
1317    template <class _Vp>
1318        _LIBCPP_INLINE_VISIBILITY
1319        pair<iterator, bool> insert_or_assign(const key_type& __k, _Vp&& __v)
1320    {
1321        iterator __p = lower_bound(__k);
1322        if ( __p != end() && !key_comp()(__k, __p->first))
1323        {
1324            __p->second = _VSTD::forward<_Vp>(__v);
1325            return _VSTD::make_pair(__p, false);
1326        }
1327        return _VSTD::make_pair(emplace_hint(__p, __k, _VSTD::forward<_Vp>(__v)), true);
1328    }
1329
1330    template <class _Vp>
1331        _LIBCPP_INLINE_VISIBILITY
1332        pair<iterator, bool> insert_or_assign(key_type&& __k, _Vp&& __v)
1333    {
1334        iterator __p = lower_bound(__k);
1335        if ( __p != end() && !key_comp()(__k, __p->first))
1336        {
1337            __p->second = _VSTD::forward<_Vp>(__v);
1338            return _VSTD::make_pair(__p, false);
1339        }
1340        return _VSTD::make_pair(emplace_hint(__p, _VSTD::move(__k), _VSTD::forward<_Vp>(__v)), true);
1341    }
1342
1343    template <class _Vp>
1344    _LIBCPP_INLINE_VISIBILITY iterator insert_or_assign(const_iterator __h,
1345                                                        const key_type& __k,
1346                                                        _Vp&& __v) {
1347      auto [__r, __inserted] = __tree_.__emplace_hint_unique_key_args(
1348          __h.__i_, __k, __k, _VSTD::forward<_Vp>(__v));
1349
1350      if (!__inserted)
1351        __r->__get_value().second = _VSTD::forward<_Vp>(__v);
1352
1353      return __r;
1354    }
1355
1356    template <class _Vp>
1357    _LIBCPP_INLINE_VISIBILITY iterator insert_or_assign(const_iterator __h,
1358                                                        key_type&& __k,
1359                                                        _Vp&& __v) {
1360      auto [__r, __inserted] = __tree_.__emplace_hint_unique_key_args(
1361          __h.__i_, __k, _VSTD::move(__k), _VSTD::forward<_Vp>(__v));
1362
1363      if (!__inserted)
1364        __r->__get_value().second = _VSTD::forward<_Vp>(__v);
1365
1366      return __r;
1367    }
1368
1369#endif // _LIBCPP_STD_VER > 14
1370
1371    _LIBCPP_INLINE_VISIBILITY
1372    iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
1373    _LIBCPP_INLINE_VISIBILITY
1374    iterator erase(iterator __p)       {return __tree_.erase(__p.__i_);}
1375    _LIBCPP_INLINE_VISIBILITY
1376    size_type erase(const key_type& __k)
1377        {return __tree_.__erase_unique(__k);}
1378    _LIBCPP_INLINE_VISIBILITY
1379    iterator  erase(const_iterator __f, const_iterator __l)
1380        {return __tree_.erase(__f.__i_, __l.__i_);}
1381    _LIBCPP_INLINE_VISIBILITY
1382    void clear() _NOEXCEPT {__tree_.clear();}
1383
1384#if _LIBCPP_STD_VER > 14
1385    _LIBCPP_INLINE_VISIBILITY
1386    insert_return_type insert(node_type&& __nh)
1387    {
1388        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
1389            "node_type with incompatible allocator passed to map::insert()");
1390        return __tree_.template __node_handle_insert_unique<
1391            node_type, insert_return_type>(_VSTD::move(__nh));
1392    }
1393    _LIBCPP_INLINE_VISIBILITY
1394    iterator insert(const_iterator __hint, node_type&& __nh)
1395    {
1396        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
1397            "node_type with incompatible allocator passed to map::insert()");
1398        return __tree_.template __node_handle_insert_unique<node_type>(
1399            __hint.__i_, _VSTD::move(__nh));
1400    }
1401    _LIBCPP_INLINE_VISIBILITY
1402    node_type extract(key_type const& __key)
1403    {
1404        return __tree_.template __node_handle_extract<node_type>(__key);
1405    }
1406    _LIBCPP_INLINE_VISIBILITY
1407    node_type extract(const_iterator __it)
1408    {
1409        return __tree_.template __node_handle_extract<node_type>(__it.__i_);
1410    }
1411    template <class _Compare2>
1412    _LIBCPP_INLINE_VISIBILITY
1413    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
1414    {
1415        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1416                       "merging container with incompatible allocator");
1417        __tree_.__node_handle_merge_unique(__source.__tree_);
1418    }
1419    template <class _Compare2>
1420    _LIBCPP_INLINE_VISIBILITY
1421    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
1422    {
1423        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1424                       "merging container with incompatible allocator");
1425        __tree_.__node_handle_merge_unique(__source.__tree_);
1426    }
1427    template <class _Compare2>
1428    _LIBCPP_INLINE_VISIBILITY
1429    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
1430    {
1431        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1432                       "merging container with incompatible allocator");
1433        __tree_.__node_handle_merge_unique(__source.__tree_);
1434    }
1435    template <class _Compare2>
1436    _LIBCPP_INLINE_VISIBILITY
1437    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
1438    {
1439        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
1440                       "merging container with incompatible allocator");
1441        __tree_.__node_handle_merge_unique(__source.__tree_);
1442    }
1443#endif
1444
1445    _LIBCPP_INLINE_VISIBILITY
1446    void swap(map& __m)
1447        _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
1448        {__tree_.swap(__m.__tree_);}
1449
1450    _LIBCPP_INLINE_VISIBILITY
1451    iterator find(const key_type& __k)             {return __tree_.find(__k);}
1452    _LIBCPP_INLINE_VISIBILITY
1453    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
1454#if _LIBCPP_STD_VER > 11
1455    template <typename _K2>
1456    _LIBCPP_INLINE_VISIBILITY
1457    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
1458    find(const _K2& __k)                           {return __tree_.find(__k);}
1459    template <typename _K2>
1460    _LIBCPP_INLINE_VISIBILITY
1461    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
1462    find(const _K2& __k) const                     {return __tree_.find(__k);}
1463#endif
1464
1465    _LIBCPP_INLINE_VISIBILITY
1466    size_type      count(const key_type& __k) const
1467        {return __tree_.__count_unique(__k);}
1468#if _LIBCPP_STD_VER > 11
1469    template <typename _K2>
1470    _LIBCPP_INLINE_VISIBILITY
1471    __enable_if_t<__is_transparent<_Compare, _K2>::value, size_type>
1472    count(const _K2& __k) const {return __tree_.__count_multi(__k);}
1473#endif
1474
1475#if _LIBCPP_STD_VER > 17
1476    _LIBCPP_INLINE_VISIBILITY
1477    bool contains(const key_type& __k) const {return find(__k) != end();}
1478    template <typename _K2>
1479    _LIBCPP_INLINE_VISIBILITY
1480    __enable_if_t<__is_transparent<_Compare, _K2>::value, bool>
1481    contains(const _K2& __k) const { return find(__k) != end(); }
1482#endif // _LIBCPP_STD_VER > 17
1483
1484    _LIBCPP_INLINE_VISIBILITY
1485    iterator lower_bound(const key_type& __k)
1486        {return __tree_.lower_bound(__k);}
1487    _LIBCPP_INLINE_VISIBILITY
1488    const_iterator lower_bound(const key_type& __k) const
1489        {return __tree_.lower_bound(__k);}
1490#if _LIBCPP_STD_VER > 11
1491    template <typename _K2>
1492    _LIBCPP_INLINE_VISIBILITY
1493    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
1494    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
1495
1496    template <typename _K2>
1497    _LIBCPP_INLINE_VISIBILITY
1498    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
1499    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
1500#endif
1501
1502    _LIBCPP_INLINE_VISIBILITY
1503    iterator upper_bound(const key_type& __k)
1504        {return __tree_.upper_bound(__k);}
1505    _LIBCPP_INLINE_VISIBILITY
1506    const_iterator upper_bound(const key_type& __k) const
1507        {return __tree_.upper_bound(__k);}
1508#if _LIBCPP_STD_VER > 11
1509    template <typename _K2>
1510    _LIBCPP_INLINE_VISIBILITY
1511    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
1512    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
1513    template <typename _K2>
1514    _LIBCPP_INLINE_VISIBILITY
1515    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
1516    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
1517#endif
1518
1519    _LIBCPP_INLINE_VISIBILITY
1520    pair<iterator,iterator> equal_range(const key_type& __k)
1521        {return __tree_.__equal_range_unique(__k);}
1522    _LIBCPP_INLINE_VISIBILITY
1523    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
1524        {return __tree_.__equal_range_unique(__k);}
1525#if _LIBCPP_STD_VER > 11
1526    template <typename _K2>
1527    _LIBCPP_INLINE_VISIBILITY
1528    __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<iterator,iterator>>
1529    equal_range(const _K2& __k)       {return __tree_.__equal_range_multi(__k);}
1530    template <typename _K2>
1531    _LIBCPP_INLINE_VISIBILITY
1532    __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<const_iterator,const_iterator>>
1533    equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
1534#endif
1535
1536private:
1537    typedef typename __base::__node                    __node;
1538    typedef typename __base::__node_allocator          __node_allocator;
1539    typedef typename __base::__node_pointer            __node_pointer;
1540    typedef typename __base::__node_base_pointer       __node_base_pointer;
1541    typedef typename __base::__parent_pointer          __parent_pointer;
1542
1543    typedef __map_node_destructor<__node_allocator> _Dp;
1544    typedef unique_ptr<__node, _Dp> __node_holder;
1545
1546#ifdef _LIBCPP_CXX03_LANG
1547    __node_holder __construct_node_with_key(const key_type& __k);
1548#endif
1549};
1550
1551#if _LIBCPP_STD_VER >= 17
1552template<class _InputIterator, class _Compare = less<__iter_key_type<_InputIterator>>,
1553         class _Allocator = allocator<__iter_to_alloc_type<_InputIterator>>,
1554         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
1555         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
1556         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1557map(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator())
1558  -> map<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>, _Compare, _Allocator>;
1559
1560template<class _Key, class _Tp, class _Compare = less<remove_const_t<_Key>>,
1561         class _Allocator = allocator<pair<const _Key, _Tp>>,
1562         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
1563         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1564map(initializer_list<pair<_Key, _Tp>>, _Compare = _Compare(), _Allocator = _Allocator())
1565  -> map<remove_const_t<_Key>, _Tp, _Compare, _Allocator>;
1566
1567template<class _InputIterator, class _Allocator,
1568         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
1569         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1570map(_InputIterator, _InputIterator, _Allocator)
1571  -> map<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>,
1572         less<__iter_key_type<_InputIterator>>, _Allocator>;
1573
1574template<class _Key, class _Tp, class _Allocator,
1575         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
1576map(initializer_list<pair<_Key, _Tp>>, _Allocator)
1577  -> map<remove_const_t<_Key>, _Tp, less<remove_const_t<_Key>>, _Allocator>;
1578#endif
1579
1580#ifndef _LIBCPP_CXX03_LANG
1581template <class _Key, class _Tp, class _Compare, class _Allocator>
1582map<_Key, _Tp, _Compare, _Allocator>::map(map&& __m, const allocator_type& __a)
1583    : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
1584{
1585    if (__a != __m.get_allocator())
1586    {
1587        const_iterator __e = cend();
1588        while (!__m.empty())
1589            __tree_.__insert_unique(__e.__i_,
1590                    __m.__tree_.remove(__m.begin().__i_)->__value_.__move());
1591    }
1592}
1593
1594template <class _Key, class _Tp, class _Compare, class _Allocator>
1595_Tp&
1596map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
1597{
1598    return __tree_.__emplace_unique_key_args(__k,
1599        _VSTD::piecewise_construct,
1600        _VSTD::forward_as_tuple(__k),
1601        _VSTD::forward_as_tuple()).first->__get_value().second;
1602}
1603
1604template <class _Key, class _Tp, class _Compare, class _Allocator>
1605_Tp&
1606map<_Key, _Tp, _Compare, _Allocator>::operator[](key_type&& __k)
1607{
1608    return __tree_.__emplace_unique_key_args(__k,
1609        _VSTD::piecewise_construct,
1610        _VSTD::forward_as_tuple(_VSTD::move(__k)),
1611        _VSTD::forward_as_tuple()).first->__get_value().second;
1612}
1613
1614#else // _LIBCPP_CXX03_LANG
1615
1616template <class _Key, class _Tp, class _Compare, class _Allocator>
1617typename map<_Key, _Tp, _Compare, _Allocator>::__node_holder
1618map<_Key, _Tp, _Compare, _Allocator>::__construct_node_with_key(const key_type& __k)
1619{
1620    __node_allocator& __na = __tree_.__node_alloc();
1621    __node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));
1622    __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__get_value().first), __k);
1623    __h.get_deleter().__first_constructed = true;
1624    __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__get_value().second));
1625    __h.get_deleter().__second_constructed = true;
1626    return __h;
1627}
1628
1629template <class _Key, class _Tp, class _Compare, class _Allocator>
1630_Tp&
1631map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
1632{
1633    __parent_pointer __parent;
1634    __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
1635    __node_pointer __r = static_cast<__node_pointer>(__child);
1636    if (__child == nullptr)
1637    {
1638        __node_holder __h = __construct_node_with_key(__k);
1639        __tree_.__insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
1640        __r = __h.release();
1641    }
1642    return __r->__value_.__get_value().second;
1643}
1644
1645#endif // _LIBCPP_CXX03_LANG
1646
1647template <class _Key, class _Tp, class _Compare, class _Allocator>
1648_Tp&
1649map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k)
1650{
1651    __parent_pointer __parent;
1652    __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
1653    if (__child == nullptr)
1654        __throw_out_of_range("map::at:  key not found");
1655    return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
1656}
1657
1658template <class _Key, class _Tp, class _Compare, class _Allocator>
1659const _Tp&
1660map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k) const
1661{
1662    __parent_pointer __parent;
1663    __node_base_pointer __child = __tree_.__find_equal(__parent, __k);
1664    if (__child == nullptr)
1665        __throw_out_of_range("map::at:  key not found");
1666    return static_cast<__node_pointer>(__child)->__value_.__get_value().second;
1667}
1668
1669
1670template <class _Key, class _Tp, class _Compare, class _Allocator>
1671inline _LIBCPP_INLINE_VISIBILITY
1672bool
1673operator==(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1674           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1675{
1676    return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
1677}
1678
1679template <class _Key, class _Tp, class _Compare, class _Allocator>
1680inline _LIBCPP_INLINE_VISIBILITY
1681bool
1682operator< (const map<_Key, _Tp, _Compare, _Allocator>& __x,
1683           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1684{
1685    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
1686}
1687
1688template <class _Key, class _Tp, class _Compare, class _Allocator>
1689inline _LIBCPP_INLINE_VISIBILITY
1690bool
1691operator!=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1692           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1693{
1694    return !(__x == __y);
1695}
1696
1697template <class _Key, class _Tp, class _Compare, class _Allocator>
1698inline _LIBCPP_INLINE_VISIBILITY
1699bool
1700operator> (const map<_Key, _Tp, _Compare, _Allocator>& __x,
1701           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1702{
1703    return __y < __x;
1704}
1705
1706template <class _Key, class _Tp, class _Compare, class _Allocator>
1707inline _LIBCPP_INLINE_VISIBILITY
1708bool
1709operator>=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1710           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1711{
1712    return !(__x < __y);
1713}
1714
1715template <class _Key, class _Tp, class _Compare, class _Allocator>
1716inline _LIBCPP_INLINE_VISIBILITY
1717bool
1718operator<=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
1719           const map<_Key, _Tp, _Compare, _Allocator>& __y)
1720{
1721    return !(__y < __x);
1722}
1723
1724template <class _Key, class _Tp, class _Compare, class _Allocator>
1725inline _LIBCPP_INLINE_VISIBILITY
1726void
1727swap(map<_Key, _Tp, _Compare, _Allocator>& __x,
1728     map<_Key, _Tp, _Compare, _Allocator>& __y)
1729    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
1730{
1731    __x.swap(__y);
1732}
1733
1734#if _LIBCPP_STD_VER > 17
1735template <class _Key, class _Tp, class _Compare, class _Allocator,
1736          class _Predicate>
1737inline _LIBCPP_INLINE_VISIBILITY
1738    typename map<_Key, _Tp, _Compare, _Allocator>::size_type
1739    erase_if(map<_Key, _Tp, _Compare, _Allocator>& __c, _Predicate __pred) {
1740  return _VSTD::__libcpp_erase_if_container(__c, __pred);
1741}
1742#endif
1743
1744
1745template <class _Key, class _Tp, class _Compare = less<_Key>,
1746          class _Allocator = allocator<pair<const _Key, _Tp> > >
1747class _LIBCPP_TEMPLATE_VIS multimap
1748{
1749public:
1750    // types:
1751    typedef _Key                                     key_type;
1752    typedef _Tp                                      mapped_type;
1753    typedef pair<const key_type, mapped_type>        value_type;
1754    typedef __type_identity_t<_Compare>              key_compare;
1755    typedef __type_identity_t<_Allocator>            allocator_type;
1756    typedef value_type&                              reference;
1757    typedef const value_type&                        const_reference;
1758
1759    static_assert((is_same<typename allocator_type::value_type, value_type>::value),
1760                  "Allocator::value_type must be same type as value_type");
1761
1762    class _LIBCPP_TEMPLATE_VIS value_compare
1763        : public __binary_function<value_type, value_type, bool>
1764    {
1765        friend class multimap;
1766    protected:
1767        key_compare comp;
1768
1769        _LIBCPP_INLINE_VISIBILITY
1770        value_compare(key_compare __c) : comp(__c) {}
1771    public:
1772        _LIBCPP_INLINE_VISIBILITY
1773        bool operator()(const value_type& __x, const value_type& __y) const
1774            {return comp(__x.first, __y.first);}
1775    };
1776
1777private:
1778
1779    typedef _VSTD::__value_type<key_type, mapped_type>             __value_type;
1780    typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
1781    typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
1782                                                 __value_type>::type __allocator_type;
1783    typedef __tree<__value_type, __vc, __allocator_type>            __base;
1784    typedef typename __base::__node_traits                          __node_traits;
1785    typedef allocator_traits<allocator_type>                        __alloc_traits;
1786
1787    __base __tree_;
1788
1789public:
1790    typedef typename __alloc_traits::pointer               pointer;
1791    typedef typename __alloc_traits::const_pointer         const_pointer;
1792    typedef typename __alloc_traits::size_type             size_type;
1793    typedef typename __alloc_traits::difference_type       difference_type;
1794    typedef __map_iterator<typename __base::iterator>      iterator;
1795    typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
1796    typedef _VSTD::reverse_iterator<iterator>               reverse_iterator;
1797    typedef _VSTD::reverse_iterator<const_iterator>         const_reverse_iterator;
1798
1799#if _LIBCPP_STD_VER > 14
1800    typedef __map_node_handle<typename __base::__node, allocator_type> node_type;
1801#endif
1802
1803    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1804        friend class _LIBCPP_TEMPLATE_VIS map;
1805    template <class _Key2, class _Value2, class _Comp2, class _Alloc2>
1806        friend class _LIBCPP_TEMPLATE_VIS multimap;
1807
1808    _LIBCPP_INLINE_VISIBILITY
1809    multimap()
1810        _NOEXCEPT_(
1811            is_nothrow_default_constructible<allocator_type>::value &&
1812            is_nothrow_default_constructible<key_compare>::value &&
1813            is_nothrow_copy_constructible<key_compare>::value)
1814        : __tree_(__vc(key_compare())) {}
1815
1816    _LIBCPP_INLINE_VISIBILITY
1817    explicit multimap(const key_compare& __comp)
1818        _NOEXCEPT_(
1819            is_nothrow_default_constructible<allocator_type>::value &&
1820            is_nothrow_copy_constructible<key_compare>::value)
1821        : __tree_(__vc(__comp)) {}
1822
1823    _LIBCPP_INLINE_VISIBILITY
1824    explicit multimap(const key_compare& __comp, const allocator_type& __a)
1825        : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}
1826
1827    template <class _InputIterator>
1828        _LIBCPP_INLINE_VISIBILITY
1829        multimap(_InputIterator __f, _InputIterator __l,
1830            const key_compare& __comp = key_compare())
1831        : __tree_(__vc(__comp))
1832        {
1833            insert(__f, __l);
1834        }
1835
1836    template <class _InputIterator>
1837        _LIBCPP_INLINE_VISIBILITY
1838        multimap(_InputIterator __f, _InputIterator __l,
1839            const key_compare& __comp, const allocator_type& __a)
1840        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1841        {
1842            insert(__f, __l);
1843        }
1844
1845#if _LIBCPP_STD_VER > 11
1846    template <class _InputIterator>
1847    _LIBCPP_INLINE_VISIBILITY
1848    multimap(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
1849        : multimap(__f, __l, key_compare(), __a) {}
1850#endif
1851
1852    _LIBCPP_INLINE_VISIBILITY
1853    multimap(const multimap& __m)
1854        : __tree_(__m.__tree_.value_comp(),
1855          __alloc_traits::select_on_container_copy_construction(__m.__tree_.__alloc()))
1856        {
1857            insert(__m.begin(), __m.end());
1858        }
1859
1860    _LIBCPP_INLINE_VISIBILITY
1861    multimap& operator=(const multimap& __m)
1862        {
1863#ifndef _LIBCPP_CXX03_LANG
1864            __tree_ = __m.__tree_;
1865#else
1866            if (this != _VSTD::addressof(__m)) {
1867                __tree_.clear();
1868                __tree_.value_comp() = __m.__tree_.value_comp();
1869                __tree_.__copy_assign_alloc(__m.__tree_);
1870                insert(__m.begin(), __m.end());
1871            }
1872#endif
1873            return *this;
1874        }
1875
1876#ifndef _LIBCPP_CXX03_LANG
1877
1878    _LIBCPP_INLINE_VISIBILITY
1879    multimap(multimap&& __m)
1880        _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
1881        : __tree_(_VSTD::move(__m.__tree_))
1882        {
1883        }
1884
1885    multimap(multimap&& __m, const allocator_type& __a);
1886
1887    _LIBCPP_INLINE_VISIBILITY
1888    multimap& operator=(multimap&& __m)
1889        _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
1890        {
1891            __tree_ = _VSTD::move(__m.__tree_);
1892            return *this;
1893        }
1894
1895    _LIBCPP_INLINE_VISIBILITY
1896    multimap(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
1897        : __tree_(__vc(__comp))
1898        {
1899            insert(__il.begin(), __il.end());
1900        }
1901
1902    _LIBCPP_INLINE_VISIBILITY
1903    multimap(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
1904        : __tree_(__vc(__comp), typename __base::allocator_type(__a))
1905        {
1906            insert(__il.begin(), __il.end());
1907        }
1908
1909#if _LIBCPP_STD_VER > 11
1910    _LIBCPP_INLINE_VISIBILITY
1911    multimap(initializer_list<value_type> __il, const allocator_type& __a)
1912        : multimap(__il, key_compare(), __a) {}
1913#endif
1914
1915    _LIBCPP_INLINE_VISIBILITY
1916    multimap& operator=(initializer_list<value_type> __il)
1917        {
1918            __tree_.__assign_multi(__il.begin(), __il.end());
1919            return *this;
1920        }
1921
1922#endif // _LIBCPP_CXX03_LANG
1923
1924    _LIBCPP_INLINE_VISIBILITY
1925    explicit multimap(const allocator_type& __a)
1926        : __tree_(typename __base::allocator_type(__a))
1927        {
1928        }
1929
1930    _LIBCPP_INLINE_VISIBILITY
1931    multimap(const multimap& __m, const allocator_type& __a)
1932        : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
1933        {
1934            insert(__m.begin(), __m.end());
1935        }
1936
1937    _LIBCPP_INLINE_VISIBILITY
1938    ~multimap() {
1939        static_assert(sizeof(__diagnose_non_const_comparator<_Key, _Compare>()), "");
1940    }
1941
1942    _LIBCPP_INLINE_VISIBILITY
1943          iterator begin() _NOEXCEPT {return __tree_.begin();}
1944    _LIBCPP_INLINE_VISIBILITY
1945    const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
1946    _LIBCPP_INLINE_VISIBILITY
1947          iterator end() _NOEXCEPT {return __tree_.end();}
1948    _LIBCPP_INLINE_VISIBILITY
1949    const_iterator end() const _NOEXCEPT {return __tree_.end();}
1950
1951    _LIBCPP_INLINE_VISIBILITY
1952          reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
1953    _LIBCPP_INLINE_VISIBILITY
1954    const_reverse_iterator rbegin() const _NOEXCEPT
1955        {return const_reverse_iterator(end());}
1956    _LIBCPP_INLINE_VISIBILITY
1957          reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
1958    _LIBCPP_INLINE_VISIBILITY
1959    const_reverse_iterator rend() const _NOEXCEPT
1960        {return const_reverse_iterator(begin());}
1961
1962    _LIBCPP_INLINE_VISIBILITY
1963    const_iterator cbegin()  const _NOEXCEPT {return begin();}
1964    _LIBCPP_INLINE_VISIBILITY
1965    const_iterator cend() const _NOEXCEPT {return end();}
1966    _LIBCPP_INLINE_VISIBILITY
1967    const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
1968    _LIBCPP_INLINE_VISIBILITY
1969    const_reverse_iterator crend() const _NOEXCEPT {return rend();}
1970
1971    _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY
1972    bool empty() const _NOEXCEPT {return __tree_.size() == 0;}
1973    _LIBCPP_INLINE_VISIBILITY
1974    size_type size() const _NOEXCEPT {return __tree_.size();}
1975    _LIBCPP_INLINE_VISIBILITY
1976    size_type max_size() const _NOEXCEPT {return __tree_.max_size();}
1977
1978    _LIBCPP_INLINE_VISIBILITY
1979    allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
1980    _LIBCPP_INLINE_VISIBILITY
1981    key_compare    key_comp() const {return __tree_.value_comp().key_comp();}
1982    _LIBCPP_INLINE_VISIBILITY
1983    value_compare  value_comp() const
1984        {return value_compare(__tree_.value_comp().key_comp());}
1985
1986#ifndef _LIBCPP_CXX03_LANG
1987
1988    template <class ..._Args>
1989    _LIBCPP_INLINE_VISIBILITY
1990    iterator emplace(_Args&& ...__args) {
1991        return __tree_.__emplace_multi(_VSTD::forward<_Args>(__args)...);
1992    }
1993
1994    template <class ..._Args>
1995    _LIBCPP_INLINE_VISIBILITY
1996    iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
1997        return __tree_.__emplace_hint_multi(__p.__i_, _VSTD::forward<_Args>(__args)...);
1998    }
1999
2000    template <class _Pp,
2001              class = __enable_if_t<is_constructible<value_type, _Pp>::value>>
2002        _LIBCPP_INLINE_VISIBILITY
2003        iterator insert(_Pp&& __p)
2004            {return __tree_.__insert_multi(_VSTD::forward<_Pp>(__p));}
2005
2006    template <class _Pp,
2007              class = __enable_if_t<is_constructible<value_type, _Pp>::value>>
2008        _LIBCPP_INLINE_VISIBILITY
2009        iterator insert(const_iterator __pos, _Pp&& __p)
2010            {return __tree_.__insert_multi(__pos.__i_, _VSTD::forward<_Pp>(__p));}
2011
2012    _LIBCPP_INLINE_VISIBILITY
2013    iterator insert(value_type&& __v)
2014        {return __tree_.__insert_multi(_VSTD::move(__v));}
2015
2016    _LIBCPP_INLINE_VISIBILITY
2017    iterator insert(const_iterator __p, value_type&& __v)
2018        {return __tree_.__insert_multi(__p.__i_, _VSTD::move(__v));}
2019
2020
2021    _LIBCPP_INLINE_VISIBILITY
2022    void insert(initializer_list<value_type> __il)
2023        {insert(__il.begin(), __il.end());}
2024
2025#endif // _LIBCPP_CXX03_LANG
2026
2027    _LIBCPP_INLINE_VISIBILITY
2028    iterator insert(const value_type& __v) {return __tree_.__insert_multi(__v);}
2029
2030    _LIBCPP_INLINE_VISIBILITY
2031    iterator insert(const_iterator __p, const value_type& __v)
2032            {return __tree_.__insert_multi(__p.__i_, __v);}
2033
2034    template <class _InputIterator>
2035        _LIBCPP_INLINE_VISIBILITY
2036        void insert(_InputIterator __f, _InputIterator __l)
2037        {
2038            for (const_iterator __e = cend(); __f != __l; ++__f)
2039                __tree_.__insert_multi(__e.__i_, *__f);
2040        }
2041
2042    _LIBCPP_INLINE_VISIBILITY
2043    iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
2044    _LIBCPP_INLINE_VISIBILITY
2045    iterator erase(iterator __p)       {return __tree_.erase(__p.__i_);}
2046    _LIBCPP_INLINE_VISIBILITY
2047    size_type erase(const key_type& __k) {return __tree_.__erase_multi(__k);}
2048    _LIBCPP_INLINE_VISIBILITY
2049    iterator  erase(const_iterator __f, const_iterator __l)
2050        {return __tree_.erase(__f.__i_, __l.__i_);}
2051
2052#if _LIBCPP_STD_VER > 14
2053    _LIBCPP_INLINE_VISIBILITY
2054    iterator insert(node_type&& __nh)
2055    {
2056        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
2057            "node_type with incompatible allocator passed to multimap::insert()");
2058        return __tree_.template __node_handle_insert_multi<node_type>(
2059            _VSTD::move(__nh));
2060    }
2061    _LIBCPP_INLINE_VISIBILITY
2062    iterator insert(const_iterator __hint, node_type&& __nh)
2063    {
2064        _LIBCPP_ASSERT(__nh.empty() || __nh.get_allocator() == get_allocator(),
2065            "node_type with incompatible allocator passed to multimap::insert()");
2066        return __tree_.template __node_handle_insert_multi<node_type>(
2067            __hint.__i_, _VSTD::move(__nh));
2068    }
2069    _LIBCPP_INLINE_VISIBILITY
2070    node_type extract(key_type const& __key)
2071    {
2072        return __tree_.template __node_handle_extract<node_type>(__key);
2073    }
2074    _LIBCPP_INLINE_VISIBILITY
2075    node_type extract(const_iterator __it)
2076    {
2077        return __tree_.template __node_handle_extract<node_type>(
2078            __it.__i_);
2079    }
2080    template <class _Compare2>
2081    _LIBCPP_INLINE_VISIBILITY
2082    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>& __source)
2083    {
2084        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2085                       "merging container with incompatible allocator");
2086        return __tree_.__node_handle_merge_multi(__source.__tree_);
2087    }
2088    template <class _Compare2>
2089    _LIBCPP_INLINE_VISIBILITY
2090    void merge(multimap<key_type, mapped_type, _Compare2, allocator_type>&& __source)
2091    {
2092        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2093                       "merging container with incompatible allocator");
2094        return __tree_.__node_handle_merge_multi(__source.__tree_);
2095    }
2096    template <class _Compare2>
2097    _LIBCPP_INLINE_VISIBILITY
2098    void merge(map<key_type, mapped_type, _Compare2, allocator_type>& __source)
2099    {
2100        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2101                       "merging container with incompatible allocator");
2102        return __tree_.__node_handle_merge_multi(__source.__tree_);
2103    }
2104    template <class _Compare2>
2105    _LIBCPP_INLINE_VISIBILITY
2106    void merge(map<key_type, mapped_type, _Compare2, allocator_type>&& __source)
2107    {
2108        _LIBCPP_ASSERT(__source.get_allocator() == get_allocator(),
2109                       "merging container with incompatible allocator");
2110        return __tree_.__node_handle_merge_multi(__source.__tree_);
2111    }
2112#endif
2113
2114    _LIBCPP_INLINE_VISIBILITY
2115    void clear() _NOEXCEPT {__tree_.clear();}
2116
2117    _LIBCPP_INLINE_VISIBILITY
2118    void swap(multimap& __m)
2119        _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
2120        {__tree_.swap(__m.__tree_);}
2121
2122    _LIBCPP_INLINE_VISIBILITY
2123    iterator find(const key_type& __k)             {return __tree_.find(__k);}
2124    _LIBCPP_INLINE_VISIBILITY
2125    const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
2126#if _LIBCPP_STD_VER > 11
2127    template <typename _K2>
2128    _LIBCPP_INLINE_VISIBILITY
2129    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
2130    find(const _K2& __k)                           {return __tree_.find(__k);}
2131    template <typename _K2>
2132    _LIBCPP_INLINE_VISIBILITY
2133    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
2134    find(const _K2& __k) const                     {return __tree_.find(__k);}
2135#endif
2136
2137    _LIBCPP_INLINE_VISIBILITY
2138    size_type      count(const key_type& __k) const
2139        {return __tree_.__count_multi(__k);}
2140#if _LIBCPP_STD_VER > 11
2141    template <typename _K2>
2142    _LIBCPP_INLINE_VISIBILITY
2143    __enable_if_t<__is_transparent<_Compare, _K2>::value, size_type>
2144    count(const _K2& __k) const {return __tree_.__count_multi(__k);}
2145#endif
2146
2147#if _LIBCPP_STD_VER > 17
2148    _LIBCPP_INLINE_VISIBILITY
2149    bool contains(const key_type& __k) const {return find(__k) != end();}
2150    template <typename _K2>
2151    _LIBCPP_INLINE_VISIBILITY
2152    __enable_if_t<__is_transparent<_Compare, _K2>::value, bool>
2153    contains(const _K2& __k) const { return find(__k) != end(); }
2154#endif // _LIBCPP_STD_VER > 17
2155
2156    _LIBCPP_INLINE_VISIBILITY
2157    iterator lower_bound(const key_type& __k)
2158        {return __tree_.lower_bound(__k);}
2159    _LIBCPP_INLINE_VISIBILITY
2160    const_iterator lower_bound(const key_type& __k) const
2161            {return __tree_.lower_bound(__k);}
2162#if _LIBCPP_STD_VER > 11
2163    template <typename _K2>
2164    _LIBCPP_INLINE_VISIBILITY
2165    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
2166    lower_bound(const _K2& __k)       {return __tree_.lower_bound(__k);}
2167
2168    template <typename _K2>
2169    _LIBCPP_INLINE_VISIBILITY
2170    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
2171    lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
2172#endif
2173
2174    _LIBCPP_INLINE_VISIBILITY
2175    iterator upper_bound(const key_type& __k)
2176            {return __tree_.upper_bound(__k);}
2177    _LIBCPP_INLINE_VISIBILITY
2178    const_iterator upper_bound(const key_type& __k) const
2179            {return __tree_.upper_bound(__k);}
2180#if _LIBCPP_STD_VER > 11
2181    template <typename _K2>
2182    _LIBCPP_INLINE_VISIBILITY
2183    __enable_if_t<__is_transparent<_Compare, _K2>::value, iterator>
2184    upper_bound(const _K2& __k)       {return __tree_.upper_bound(__k);}
2185    template <typename _K2>
2186    _LIBCPP_INLINE_VISIBILITY
2187    __enable_if_t<__is_transparent<_Compare, _K2>::value, const_iterator>
2188    upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
2189#endif
2190
2191    _LIBCPP_INLINE_VISIBILITY
2192    pair<iterator,iterator>             equal_range(const key_type& __k)
2193            {return __tree_.__equal_range_multi(__k);}
2194    _LIBCPP_INLINE_VISIBILITY
2195    pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
2196            {return __tree_.__equal_range_multi(__k);}
2197#if _LIBCPP_STD_VER > 11
2198    template <typename _K2>
2199    _LIBCPP_INLINE_VISIBILITY
2200    __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<iterator,iterator>>
2201    equal_range(const _K2& __k)       {return __tree_.__equal_range_multi(__k);}
2202    template <typename _K2>
2203    _LIBCPP_INLINE_VISIBILITY
2204    __enable_if_t<__is_transparent<_Compare, _K2>::value, pair<const_iterator,const_iterator>>
2205    equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
2206#endif
2207
2208private:
2209    typedef typename __base::__node                    __node;
2210    typedef typename __base::__node_allocator          __node_allocator;
2211    typedef typename __base::__node_pointer            __node_pointer;
2212
2213    typedef __map_node_destructor<__node_allocator> _Dp;
2214    typedef unique_ptr<__node, _Dp> __node_holder;
2215};
2216
2217#if _LIBCPP_STD_VER >= 17
2218template<class _InputIterator, class _Compare = less<__iter_key_type<_InputIterator>>,
2219         class _Allocator = allocator<__iter_to_alloc_type<_InputIterator>>,
2220         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
2221         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
2222         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2223multimap(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator())
2224  -> multimap<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>, _Compare, _Allocator>;
2225
2226template<class _Key, class _Tp, class _Compare = less<remove_const_t<_Key>>,
2227         class _Allocator = allocator<pair<const _Key, _Tp>>,
2228         class = enable_if_t<!__is_allocator<_Compare>::value, void>,
2229         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2230multimap(initializer_list<pair<_Key, _Tp>>, _Compare = _Compare(), _Allocator = _Allocator())
2231  -> multimap<remove_const_t<_Key>, _Tp, _Compare, _Allocator>;
2232
2233template<class _InputIterator, class _Allocator,
2234         class = enable_if_t<__is_cpp17_input_iterator<_InputIterator>::value, void>,
2235         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2236multimap(_InputIterator, _InputIterator, _Allocator)
2237  -> multimap<__iter_key_type<_InputIterator>, __iter_mapped_type<_InputIterator>,
2238         less<__iter_key_type<_InputIterator>>, _Allocator>;
2239
2240template<class _Key, class _Tp, class _Allocator,
2241         class = enable_if_t<__is_allocator<_Allocator>::value, void>>
2242multimap(initializer_list<pair<_Key, _Tp>>, _Allocator)
2243  -> multimap<remove_const_t<_Key>, _Tp, less<remove_const_t<_Key>>, _Allocator>;
2244#endif
2245
2246#ifndef _LIBCPP_CXX03_LANG
2247template <class _Key, class _Tp, class _Compare, class _Allocator>
2248multimap<_Key, _Tp, _Compare, _Allocator>::multimap(multimap&& __m, const allocator_type& __a)
2249    : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
2250{
2251    if (__a != __m.get_allocator())
2252    {
2253        const_iterator __e = cend();
2254        while (!__m.empty())
2255            __tree_.__insert_multi(__e.__i_,
2256                    _VSTD::move(__m.__tree_.remove(__m.begin().__i_)->__value_.__move()));
2257    }
2258}
2259#endif
2260
2261template <class _Key, class _Tp, class _Compare, class _Allocator>
2262inline _LIBCPP_INLINE_VISIBILITY
2263bool
2264operator==(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2265           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2266{
2267    return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
2268}
2269
2270template <class _Key, class _Tp, class _Compare, class _Allocator>
2271inline _LIBCPP_INLINE_VISIBILITY
2272bool
2273operator< (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2274           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2275{
2276    return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
2277}
2278
2279template <class _Key, class _Tp, class _Compare, class _Allocator>
2280inline _LIBCPP_INLINE_VISIBILITY
2281bool
2282operator!=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2283           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2284{
2285    return !(__x == __y);
2286}
2287
2288template <class _Key, class _Tp, class _Compare, class _Allocator>
2289inline _LIBCPP_INLINE_VISIBILITY
2290bool
2291operator> (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2292           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2293{
2294    return __y < __x;
2295}
2296
2297template <class _Key, class _Tp, class _Compare, class _Allocator>
2298inline _LIBCPP_INLINE_VISIBILITY
2299bool
2300operator>=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2301           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2302{
2303    return !(__x < __y);
2304}
2305
2306template <class _Key, class _Tp, class _Compare, class _Allocator>
2307inline _LIBCPP_INLINE_VISIBILITY
2308bool
2309operator<=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2310           const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2311{
2312    return !(__y < __x);
2313}
2314
2315template <class _Key, class _Tp, class _Compare, class _Allocator>
2316inline _LIBCPP_INLINE_VISIBILITY
2317void
2318swap(multimap<_Key, _Tp, _Compare, _Allocator>& __x,
2319     multimap<_Key, _Tp, _Compare, _Allocator>& __y)
2320    _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
2321{
2322    __x.swap(__y);
2323}
2324
2325#if _LIBCPP_STD_VER > 17
2326template <class _Key, class _Tp, class _Compare, class _Allocator,
2327          class _Predicate>
2328inline _LIBCPP_INLINE_VISIBILITY
2329    typename multimap<_Key, _Tp, _Compare, _Allocator>::size_type
2330    erase_if(multimap<_Key, _Tp, _Compare, _Allocator>& __c,
2331             _Predicate __pred) {
2332  return _VSTD::__libcpp_erase_if_container(__c, __pred);
2333}
2334#endif
2335
2336_LIBCPP_END_NAMESPACE_STD
2337
2338#endif // _LIBCPP_MAP
2339