|  | // -*- C++ -*- | 
|  | //===----------------------------------------------------------------------===// | 
|  | // | 
|  | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | 
|  | // See https://llvm.org/LICENSE.txt for license information. | 
|  | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | 
|  | // | 
|  | //===----------------------------------------------------------------------===// | 
|  |  | 
|  | #ifndef _LIBCPP_SET | 
|  | #define _LIBCPP_SET | 
|  |  | 
|  | /* | 
|  |  | 
|  | set synopsis | 
|  |  | 
|  | namespace std | 
|  | { | 
|  |  | 
|  | template <class Key, class Compare = less<Key>, | 
|  | class Allocator = allocator<Key>> | 
|  | class set | 
|  | { | 
|  | public: | 
|  | // types: | 
|  | typedef Key                                      key_type; | 
|  | typedef key_type                                 value_type; | 
|  | typedef Compare                                  key_compare; | 
|  | typedef key_compare                              value_compare; | 
|  | typedef Allocator                                allocator_type; | 
|  | typedef typename allocator_type::reference       reference; | 
|  | typedef typename allocator_type::const_reference const_reference; | 
|  | typedef typename allocator_type::size_type       size_type; | 
|  | typedef typename allocator_type::difference_type difference_type; | 
|  | typedef typename allocator_type::pointer         pointer; | 
|  | typedef typename allocator_type::const_pointer   const_pointer; | 
|  |  | 
|  | typedef implementation-defined                   iterator; | 
|  | typedef implementation-defined                   const_iterator; | 
|  | typedef std::reverse_iterator<iterator>          reverse_iterator; | 
|  | typedef std::reverse_iterator<const_iterator>    const_reverse_iterator; | 
|  | typedef unspecified                              node_type;               // C++17 | 
|  | typedef INSERT_RETURN_TYPE<iterator, node_type>  insert_return_type;      // C++17 | 
|  |  | 
|  | // construct/copy/destroy: | 
|  | set() | 
|  | noexcept( | 
|  | is_nothrow_default_constructible<allocator_type>::value && | 
|  | is_nothrow_default_constructible<key_compare>::value && | 
|  | is_nothrow_copy_constructible<key_compare>::value); | 
|  | explicit set(const value_compare& comp); | 
|  | set(const value_compare& comp, const allocator_type& a); | 
|  | template <class InputIterator> | 
|  | set(InputIterator first, InputIterator last, | 
|  | const value_compare& comp = value_compare()); | 
|  | template <class InputIterator> | 
|  | set(InputIterator first, InputIterator last, const value_compare& comp, | 
|  | const allocator_type& a); | 
|  | template<container-compatible-range<value_type> R> | 
|  | set(from_range_t, R&& rg, const Compare& comp = Compare(), const Allocator& = Allocator()); // C++23 | 
|  | set(const set& s); | 
|  | set(set&& s) | 
|  | noexcept( | 
|  | is_nothrow_move_constructible<allocator_type>::value && | 
|  | is_nothrow_move_constructible<key_compare>::value); | 
|  | explicit set(const allocator_type& a); | 
|  | set(const set& s, const allocator_type& a); | 
|  | set(set&& s, const allocator_type& a); | 
|  | set(initializer_list<value_type> il, const value_compare& comp = value_compare()); | 
|  | set(initializer_list<value_type> il, const value_compare& comp, | 
|  | const allocator_type& a); | 
|  | template <class InputIterator> | 
|  | set(InputIterator first, InputIterator last, const allocator_type& a) | 
|  | : set(first, last, Compare(), a) {}  // C++14 | 
|  | template<container-compatible-range<value_type> R> | 
|  | set(from_range_t, R&& rg, const Allocator& a)) | 
|  | : set(from_range, std::forward<R>(rg), Compare(), a) { } // C++23 | 
|  | set(initializer_list<value_type> il, const allocator_type& a) | 
|  | : set(il, Compare(), a) {}  // C++14 | 
|  | ~set(); | 
|  |  | 
|  | set& operator=(const set& s); | 
|  | set& operator=(set&& s) | 
|  | noexcept( | 
|  | allocator_type::propagate_on_container_move_assignment::value && | 
|  | is_nothrow_move_assignable<allocator_type>::value && | 
|  | is_nothrow_move_assignable<key_compare>::value); | 
|  | set& operator=(initializer_list<value_type> il); | 
|  |  | 
|  | // iterators: | 
|  | iterator begin() noexcept; | 
|  | const_iterator begin() const noexcept; | 
|  | iterator end() noexcept; | 
|  | const_iterator end()   const noexcept; | 
|  |  | 
|  | reverse_iterator rbegin() noexcept; | 
|  | const_reverse_iterator rbegin() const noexcept; | 
|  | reverse_iterator rend() noexcept; | 
|  | const_reverse_iterator rend()   const noexcept; | 
|  |  | 
|  | const_iterator         cbegin()  const noexcept; | 
|  | const_iterator         cend()    const noexcept; | 
|  | const_reverse_iterator crbegin() const noexcept; | 
|  | const_reverse_iterator crend()   const noexcept; | 
|  |  | 
|  | // capacity: | 
|  | bool      empty()    const noexcept; | 
|  | size_type size()     const noexcept; | 
|  | size_type max_size() const noexcept; | 
|  |  | 
|  | // modifiers: | 
|  | template <class... Args> | 
|  | pair<iterator, bool> emplace(Args&&... args); | 
|  | template <class... Args> | 
|  | iterator emplace_hint(const_iterator position, Args&&... args); | 
|  | pair<iterator,bool> insert(const value_type& v); | 
|  | pair<iterator,bool> insert(value_type&& v); | 
|  | iterator insert(const_iterator position, const value_type& v); | 
|  | iterator insert(const_iterator position, value_type&& v); | 
|  | template <class InputIterator> | 
|  | void insert(InputIterator first, InputIterator last); | 
|  | template<container-compatible-range<value_type> R> | 
|  | void insert_range(R&& rg);                                                      // C++23 | 
|  | void insert(initializer_list<value_type> il); | 
|  |  | 
|  | node_type extract(const_iterator position);                                       // C++17 | 
|  | node_type extract(const key_type& x);                                             // C++17 | 
|  | insert_return_type insert(node_type&& nh);                                        // C++17 | 
|  | iterator insert(const_iterator hint, node_type&& nh);                             // C++17 | 
|  |  | 
|  | iterator  erase(const_iterator position); | 
|  | iterator  erase(iterator position);  // C++14 | 
|  | size_type erase(const key_type& k); | 
|  | iterator  erase(const_iterator first, const_iterator last); | 
|  | void clear() noexcept; | 
|  |  | 
|  | template<class C2> | 
|  | void merge(set<Key, C2, Allocator>& source);         // C++17 | 
|  | template<class C2> | 
|  | void merge(set<Key, C2, Allocator>&& source);        // C++17 | 
|  | template<class C2> | 
|  | void merge(multiset<Key, C2, Allocator>& source);    // C++17 | 
|  | template<class C2> | 
|  | void merge(multiset<Key, C2, Allocator>&& source);   // C++17 | 
|  |  | 
|  | void swap(set& s) | 
|  | noexcept( | 
|  | __is_nothrow_swappable<key_compare>::value && | 
|  | (!allocator_type::propagate_on_container_swap::value || | 
|  | __is_nothrow_swappable<allocator_type>::value)); | 
|  |  | 
|  | // observers: | 
|  | allocator_type get_allocator() const noexcept; | 
|  | key_compare    key_comp()      const; | 
|  | value_compare  value_comp()    const; | 
|  |  | 
|  | // set operations: | 
|  | iterator find(const key_type& k); | 
|  | const_iterator find(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator find(const K& x); | 
|  | template<typename K> | 
|  | const_iterator find(const K& x) const;  // C++14 | 
|  |  | 
|  | template<typename K> | 
|  | size_type count(const K& x) const;        // C++14 | 
|  | size_type      count(const key_type& k) const; | 
|  |  | 
|  | bool           contains(const key_type& x) const;  // C++20 | 
|  | template<class K> bool contains(const K& x) const; // C++20 | 
|  |  | 
|  | iterator lower_bound(const key_type& k); | 
|  | const_iterator lower_bound(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator lower_bound(const K& x);              // C++14 | 
|  | template<typename K> | 
|  | const_iterator lower_bound(const K& x) const;  // C++14 | 
|  |  | 
|  | iterator upper_bound(const key_type& k); | 
|  | const_iterator upper_bound(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator upper_bound(const K& x);              // C++14 | 
|  | template<typename K> | 
|  | const_iterator upper_bound(const K& x) const;  // C++14 | 
|  | pair<iterator,iterator>             equal_range(const key_type& k); | 
|  | pair<const_iterator,const_iterator> equal_range(const key_type& k) const; | 
|  | template<typename K> | 
|  | pair<iterator,iterator>             equal_range(const K& x);        // C++14 | 
|  | template<typename K> | 
|  | pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14 | 
|  | }; | 
|  |  | 
|  | template <class InputIterator, | 
|  | class Compare = less<typename iterator_traits<InputIterator>::value_type>, | 
|  | class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>> | 
|  | set(InputIterator, InputIterator, | 
|  | Compare = Compare(), Allocator = Allocator()) | 
|  | -> set<typename iterator_traits<InputIterator>::value_type, Compare, Allocator>; // C++17 | 
|  |  | 
|  | template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>, | 
|  | class Allocator = allocator<ranges::range_value_t<R>>> | 
|  | set(from_range_t, R&&, Compare = Compare(), Allocator = Allocator()) | 
|  | -> set<ranges::range_value_t<R>, Compare, Allocator>; // C++23 | 
|  |  | 
|  | template<class Key, class Compare = less<Key>, class Allocator = allocator<Key>> | 
|  | set(initializer_list<Key>, Compare = Compare(), Allocator = Allocator()) | 
|  | -> set<Key, Compare, Allocator>; // C++17 | 
|  |  | 
|  | template<class InputIterator, class Allocator> | 
|  | set(InputIterator, InputIterator, Allocator) | 
|  | -> set<typename iterator_traits<InputIterator>::value_type, | 
|  | less<typename iterator_traits<InputIterator>::value_type>, Allocator>; // C++17 | 
|  |  | 
|  | template<ranges::input_range R, class Allocator> | 
|  | set(from_range_t, R&&, Allocator) | 
|  | -> set<ranges::range_value_t<R>, less<ranges::range_value_t<R>>, Allocator>; // C++23 | 
|  |  | 
|  | template<class Key, class Allocator> | 
|  | set(initializer_list<Key>, Allocator) -> set<Key, less<Key>, Allocator>; // C++17 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator==(const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y); | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator< (const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator!=(const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator> (const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator>=(const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator<=(const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template<class Key, class Compare, class Allocator> | 
|  | synth-three-way-result<Key> operator<=>(const set<Key, Compare, Allocator>& x, | 
|  | const set<Key, Compare, Allocator>& y); // since C++20 | 
|  |  | 
|  | // specialized algorithms: | 
|  | template <class Key, class Compare, class Allocator> | 
|  | void | 
|  | swap(set<Key, Compare, Allocator>& x, set<Key, Compare, Allocator>& y) | 
|  | noexcept(noexcept(x.swap(y))); | 
|  |  | 
|  | template <class Key, class Compare, class Allocator, class Predicate> | 
|  | typename set<Key, Compare, Allocator>::size_type | 
|  | erase_if(set<Key, Compare, Allocator>& c, Predicate pred);  // C++20 | 
|  |  | 
|  | template <class Key, class Compare = less<Key>, | 
|  | class Allocator = allocator<Key>> | 
|  | class multiset | 
|  | { | 
|  | public: | 
|  | // types: | 
|  | typedef Key                                      key_type; | 
|  | typedef key_type                                 value_type; | 
|  | typedef Compare                                  key_compare; | 
|  | typedef key_compare                              value_compare; | 
|  | typedef Allocator                                allocator_type; | 
|  | typedef typename allocator_type::reference       reference; | 
|  | typedef typename allocator_type::const_reference const_reference; | 
|  | typedef typename allocator_type::size_type       size_type; | 
|  | typedef typename allocator_type::difference_type difference_type; | 
|  | typedef typename allocator_type::pointer         pointer; | 
|  | typedef typename allocator_type::const_pointer   const_pointer; | 
|  |  | 
|  | typedef implementation-defined                   iterator; | 
|  | typedef implementation-defined                   const_iterator; | 
|  | typedef std::reverse_iterator<iterator>          reverse_iterator; | 
|  | typedef std::reverse_iterator<const_iterator>    const_reverse_iterator; | 
|  | typedef unspecified                              node_type;               // C++17 | 
|  |  | 
|  | // construct/copy/destroy: | 
|  | multiset() | 
|  | noexcept( | 
|  | is_nothrow_default_constructible<allocator_type>::value && | 
|  | is_nothrow_default_constructible<key_compare>::value && | 
|  | is_nothrow_copy_constructible<key_compare>::value); | 
|  | explicit multiset(const value_compare& comp); | 
|  | multiset(const value_compare& comp, const allocator_type& a); | 
|  | template <class InputIterator> | 
|  | multiset(InputIterator first, InputIterator last, | 
|  | const value_compare& comp = value_compare()); | 
|  | template <class InputIterator> | 
|  | multiset(InputIterator first, InputIterator last, | 
|  | const value_compare& comp, const allocator_type& a); | 
|  | template<container-compatible-range<value_type> R> | 
|  | multiset(from_range_t, R&& rg, | 
|  | const Compare& comp = Compare(), const Allocator& = Allocator()); // C++23 | 
|  | multiset(const multiset& s); | 
|  | multiset(multiset&& s) | 
|  | noexcept( | 
|  | is_nothrow_move_constructible<allocator_type>::value && | 
|  | is_nothrow_move_constructible<key_compare>::value); | 
|  | explicit multiset(const allocator_type& a); | 
|  | multiset(const multiset& s, const allocator_type& a); | 
|  | multiset(multiset&& s, const allocator_type& a); | 
|  | multiset(initializer_list<value_type> il, const value_compare& comp = value_compare()); | 
|  | multiset(initializer_list<value_type> il, const value_compare& comp, | 
|  | const allocator_type& a); | 
|  | template <class InputIterator> | 
|  | multiset(InputIterator first, InputIterator last, const allocator_type& a) | 
|  | : set(first, last, Compare(), a) {}  // C++14 | 
|  | template<container-compatible-range<value_type> R> | 
|  | multiset(from_range_t, R&& rg, const Allocator& a)) | 
|  | : multiset(from_range, std::forward<R>(rg), Compare(), a) { } // C++23 | 
|  | multiset(initializer_list<value_type> il, const allocator_type& a) | 
|  | : set(il, Compare(), a) {}  // C++14 | 
|  | ~multiset(); | 
|  |  | 
|  | multiset& operator=(const multiset& s); | 
|  | multiset& operator=(multiset&& s) | 
|  | noexcept( | 
|  | allocator_type::propagate_on_container_move_assignment::value && | 
|  | is_nothrow_move_assignable<allocator_type>::value && | 
|  | is_nothrow_move_assignable<key_compare>::value); | 
|  | multiset& operator=(initializer_list<value_type> il); | 
|  |  | 
|  | // iterators: | 
|  | iterator begin() noexcept; | 
|  | const_iterator begin() const noexcept; | 
|  | iterator end() noexcept; | 
|  | const_iterator end()   const noexcept; | 
|  |  | 
|  | reverse_iterator rbegin() noexcept; | 
|  | const_reverse_iterator rbegin() const noexcept; | 
|  | reverse_iterator rend() noexcept; | 
|  | const_reverse_iterator rend()   const noexcept; | 
|  |  | 
|  | const_iterator         cbegin()  const noexcept; | 
|  | const_iterator         cend()    const noexcept; | 
|  | const_reverse_iterator crbegin() const noexcept; | 
|  | const_reverse_iterator crend()   const noexcept; | 
|  |  | 
|  | // capacity: | 
|  | bool      empty()    const noexcept; | 
|  | size_type size()     const noexcept; | 
|  | size_type max_size() const noexcept; | 
|  |  | 
|  | // modifiers: | 
|  | template <class... Args> | 
|  | iterator emplace(Args&&... args); | 
|  | template <class... Args> | 
|  | iterator emplace_hint(const_iterator position, Args&&... args); | 
|  | iterator insert(const value_type& v); | 
|  | iterator insert(value_type&& v); | 
|  | iterator insert(const_iterator position, const value_type& v); | 
|  | iterator insert(const_iterator position, value_type&& v); | 
|  | template <class InputIterator> | 
|  | void insert(InputIterator first, InputIterator last); | 
|  | template<container-compatible-range<value_type> R> | 
|  | void insert_range(R&& rg);                                                      // C++23 | 
|  | void insert(initializer_list<value_type> il); | 
|  |  | 
|  | node_type extract(const_iterator position);                                       // C++17 | 
|  | node_type extract(const key_type& x);                                             // C++17 | 
|  | iterator insert(node_type&& nh);                                                  // C++17 | 
|  | iterator insert(const_iterator hint, node_type&& nh);                             // C++17 | 
|  |  | 
|  | iterator  erase(const_iterator position); | 
|  | iterator  erase(iterator position);  // C++14 | 
|  | size_type erase(const key_type& k); | 
|  | iterator  erase(const_iterator first, const_iterator last); | 
|  | void clear() noexcept; | 
|  |  | 
|  | template<class C2> | 
|  | void merge(multiset<Key, C2, Allocator>& source);    // C++17 | 
|  | template<class C2> | 
|  | void merge(multiset<Key, C2, Allocator>&& source);   // C++17 | 
|  | template<class C2> | 
|  | void merge(set<Key, C2, Allocator>& source);         // C++17 | 
|  | template<class C2> | 
|  | void merge(set<Key, C2, Allocator>&& source);        // C++17 | 
|  |  | 
|  | void swap(multiset& s) | 
|  | noexcept( | 
|  | __is_nothrow_swappable<key_compare>::value && | 
|  | (!allocator_type::propagate_on_container_swap::value || | 
|  | __is_nothrow_swappable<allocator_type>::value)); | 
|  |  | 
|  | // observers: | 
|  | allocator_type get_allocator() const noexcept; | 
|  | key_compare    key_comp()      const; | 
|  | value_compare  value_comp()    const; | 
|  |  | 
|  | // set operations: | 
|  | iterator find(const key_type& k); | 
|  | const_iterator find(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator find(const K& x); | 
|  | template<typename K> | 
|  | const_iterator find(const K& x) const;  // C++14 | 
|  |  | 
|  | template<typename K> | 
|  | size_type count(const K& x) const;      // C++14 | 
|  | size_type      count(const key_type& k) const; | 
|  |  | 
|  | bool           contains(const key_type& x) const;  // C++20 | 
|  | template<class K> bool contains(const K& x) const; // C++20 | 
|  |  | 
|  | iterator lower_bound(const key_type& k); | 
|  | const_iterator lower_bound(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator lower_bound(const K& x);              // C++14 | 
|  | template<typename K> | 
|  | const_iterator lower_bound(const K& x) const;  // C++14 | 
|  |  | 
|  | iterator upper_bound(const key_type& k); | 
|  | const_iterator upper_bound(const key_type& k) const; | 
|  | template<typename K> | 
|  | iterator upper_bound(const K& x);              // C++14 | 
|  | template<typename K> | 
|  | const_iterator upper_bound(const K& x) const;  // C++14 | 
|  |  | 
|  | pair<iterator,iterator>             equal_range(const key_type& k); | 
|  | pair<const_iterator,const_iterator> equal_range(const key_type& k) const; | 
|  | template<typename K> | 
|  | pair<iterator,iterator>             equal_range(const K& x);        // C++14 | 
|  | template<typename K> | 
|  | pair<const_iterator,const_iterator> equal_range(const K& x) const;  // C++14 | 
|  | }; | 
|  |  | 
|  | template <class InputIterator, | 
|  | class Compare = less<typename iterator_traits<InputIterator>::value_type>, | 
|  | class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>> | 
|  | multiset(InputIterator, InputIterator, | 
|  | Compare = Compare(), Allocator = Allocator()) | 
|  | -> multiset<typename iterator_traits<InputIterator>::value_type, Compare, Allocator>; // C++17 | 
|  |  | 
|  | template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>, | 
|  | class Allocator = allocator<ranges::range_value_t<R>>> | 
|  | multiset(from_range_t, R&&, Compare = Compare(), Allocator = Allocator()) | 
|  | -> multiset<ranges::range_value_t<R>, Compare, Allocator>; | 
|  |  | 
|  | template<class Key, class Compare = less<Key>, class Allocator = allocator<Key>> | 
|  | multiset(initializer_list<Key>, Compare = Compare(), Allocator = Allocator()) | 
|  | -> multiset<Key, Compare, Allocator>; // C++17 | 
|  |  | 
|  | template<class InputIterator, class Allocator> | 
|  | multiset(InputIterator, InputIterator, Allocator) | 
|  | -> multiset<typename iterator_traits<InputIterator>::value_type, | 
|  | less<typename iterator_traits<InputIterator>::value_type>, Allocator>; // C++17 | 
|  |  | 
|  | template<ranges::input_range R, class Allocator> | 
|  | multiset(from_range_t, R&&, Allocator) | 
|  | -> multiset<ranges::range_value_t<R>, less<ranges::range_value_t<R>>, Allocator>; | 
|  |  | 
|  | template<class Key, class Allocator> | 
|  | multiset(initializer_list<Key>, Allocator) -> multiset<Key, less<Key>, Allocator>; // C++17 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator==(const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y); | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator< (const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator!=(const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator> (const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator>=(const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template <class Key, class Compare, class Allocator> | 
|  | bool | 
|  | operator<=(const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y);                                // removed in C++20 | 
|  |  | 
|  | template<class Key, class Compare, class Allocator> | 
|  | synth-three-way-result<Key> operator<=>(const multiset<Key, Compare, Allocator>& x, | 
|  | const multiset<Key, Compare, Allocator>& y); // since C++20 | 
|  |  | 
|  | // specialized algorithms: | 
|  | template <class Key, class Compare, class Allocator> | 
|  | void | 
|  | swap(multiset<Key, Compare, Allocator>& x, multiset<Key, Compare, Allocator>& y) | 
|  | noexcept(noexcept(x.swap(y))); | 
|  |  | 
|  | template <class Key, class Compare, class Allocator, class Predicate> | 
|  | typename multiset<Key, Compare, Allocator>::size_type | 
|  | erase_if(multiset<Key, Compare, Allocator>& c, Predicate pred);  // C++20 | 
|  |  | 
|  | }  // std | 
|  |  | 
|  | */ | 
|  |  | 
|  | #if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) | 
|  | #  include <__cxx03/set> | 
|  | #else | 
|  | #  include <__algorithm/equal.h> | 
|  | #  include <__algorithm/lexicographical_compare.h> | 
|  | #  include <__algorithm/lexicographical_compare_three_way.h> | 
|  | #  include <__assert> | 
|  | #  include <__config> | 
|  | #  include <__functional/is_transparent.h> | 
|  | #  include <__functional/operations.h> | 
|  | #  include <__fwd/set.h> | 
|  | #  include <__iterator/erase_if_container.h> | 
|  | #  include <__iterator/iterator_traits.h> | 
|  | #  include <__iterator/ranges_iterator_traits.h> | 
|  | #  include <__iterator/reverse_iterator.h> | 
|  | #  include <__memory/allocator.h> | 
|  | #  include <__memory/allocator_traits.h> | 
|  | #  include <__memory_resource/polymorphic_allocator.h> | 
|  | #  include <__node_handle> | 
|  | #  include <__ranges/concepts.h> | 
|  | #  include <__ranges/container_compatible_range.h> | 
|  | #  include <__ranges/from_range.h> | 
|  | #  include <__tree> | 
|  | #  include <__type_traits/container_traits.h> | 
|  | #  include <__type_traits/enable_if.h> | 
|  | #  include <__type_traits/is_allocator.h> | 
|  | #  include <__type_traits/is_nothrow_assignable.h> | 
|  | #  include <__type_traits/is_nothrow_constructible.h> | 
|  | #  include <__type_traits/is_same.h> | 
|  | #  include <__type_traits/is_swappable.h> | 
|  | #  include <__type_traits/type_identity.h> | 
|  | #  include <__utility/forward.h> | 
|  | #  include <__utility/move.h> | 
|  | #  include <__utility/pair.h> | 
|  | #  include <version> | 
|  |  | 
|  | // standard-mandated includes | 
|  |  | 
|  | // [iterator.range] | 
|  | #  include <__iterator/access.h> | 
|  | #  include <__iterator/data.h> | 
|  | #  include <__iterator/empty.h> | 
|  | #  include <__iterator/reverse_access.h> | 
|  | #  include <__iterator/size.h> | 
|  |  | 
|  | // [associative.set.syn] | 
|  | #  include <compare> | 
|  | #  include <initializer_list> | 
|  |  | 
|  | #  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) | 
|  | #    pragma GCC system_header | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_PUSH_MACROS | 
|  | #  include <__undef_macros> | 
|  |  | 
|  | _LIBCPP_BEGIN_NAMESPACE_STD | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | class set { | 
|  | public: | 
|  | // types: | 
|  | typedef _Key key_type; | 
|  | typedef key_type value_type; | 
|  | typedef __type_identity_t<_Compare> key_compare; | 
|  | typedef key_compare value_compare; | 
|  | typedef __type_identity_t<_Allocator> allocator_type; | 
|  | typedef value_type& reference; | 
|  | typedef const value_type& const_reference; | 
|  |  | 
|  | static_assert(is_same<typename allocator_type::value_type, value_type>::value, | 
|  | "Allocator::value_type must be same type as value_type"); | 
|  |  | 
|  | private: | 
|  | typedef __tree<value_type, value_compare, allocator_type> __base; | 
|  | typedef allocator_traits<allocator_type> __alloc_traits; | 
|  |  | 
|  | static_assert(__check_valid_allocator<allocator_type>::value, ""); | 
|  |  | 
|  | __base __tree_; | 
|  |  | 
|  | public: | 
|  | typedef typename __base::pointer pointer; | 
|  | typedef typename __base::const_pointer const_pointer; | 
|  | typedef typename __base::size_type size_type; | 
|  | typedef typename __base::difference_type difference_type; | 
|  | typedef typename __base::const_iterator iterator; | 
|  | typedef typename __base::const_iterator const_iterator; | 
|  | typedef std::reverse_iterator<iterator> reverse_iterator; | 
|  | typedef std::reverse_iterator<const_iterator> const_reverse_iterator; | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | typedef __set_node_handle<typename __base::__node, allocator_type> node_type; | 
|  | typedef __insert_return_type<iterator, node_type> insert_return_type; | 
|  | #  endif | 
|  |  | 
|  | template <class _Key2, class _Compare2, class _Alloc2> | 
|  | friend class set; | 
|  | template <class _Key2, class _Compare2, class _Alloc2> | 
|  | friend class multiset; | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set() _NOEXCEPT_( | 
|  | is_nothrow_default_constructible<allocator_type>::value&& is_nothrow_default_constructible<key_compare>::value&& | 
|  | is_nothrow_copy_constructible<key_compare>::value) | 
|  | : __tree_(value_compare()) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI explicit set(const value_compare& __comp) _NOEXCEPT_( | 
|  | is_nothrow_default_constructible<allocator_type>::value&& is_nothrow_copy_constructible<key_compare>::value) | 
|  | : __tree_(__comp) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI explicit set(const value_compare& __comp, const allocator_type& __a) : __tree_(__comp, __a) {} | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI set(_InputIterator __f, _InputIterator __l, const value_compare& __comp = value_compare()) | 
|  | : __tree_(__comp) { | 
|  | insert(__f, __l); | 
|  | } | 
|  |  | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI | 
|  | set(_InputIterator __f, _InputIterator __l, const value_compare& __comp, const allocator_type& __a) | 
|  | : __tree_(__comp, __a) { | 
|  | insert(__f, __l); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 23 | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI | 
|  | set(from_range_t, | 
|  | _Range&& __range, | 
|  | const key_compare& __comp = key_compare(), | 
|  | const allocator_type& __a = allocator_type()) | 
|  | : __tree_(__comp, __a) { | 
|  | insert_range(std::forward<_Range>(__range)); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI set(_InputIterator __f, _InputIterator __l, const allocator_type& __a) | 
|  | : set(__f, __l, key_compare(), __a) {} | 
|  | #  endif | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 23 | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI set(from_range_t, _Range&& __range, const allocator_type& __a) | 
|  | : set(from_range, std::forward<_Range>(__range), key_compare(), __a) {} | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set(const set& __s) : __tree_(__s.__tree_) { insert(__s.begin(), __s.end()); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set& operator=(const set& __s) { | 
|  | __tree_ = __s.__tree_; | 
|  | return *this; | 
|  | } | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI set(set&& __s) noexcept(is_nothrow_move_constructible<__base>::value) | 
|  | : __tree_(std::move(__s.__tree_)) {} | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI explicit set(const allocator_type& __a) : __tree_(__a) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set(const set& __s, const allocator_type& __a) : __tree_(__s.__tree_.value_comp(), __a) { | 
|  | insert(__s.begin(), __s.end()); | 
|  | } | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI set(set&& __s, const allocator_type& __a); | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set(initializer_list<value_type> __il, const value_compare& __comp = value_compare()) | 
|  | : __tree_(__comp) { | 
|  | insert(__il.begin(), __il.end()); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set(initializer_list<value_type> __il, const value_compare& __comp, const allocator_type& __a) | 
|  | : __tree_(__comp, __a) { | 
|  | insert(__il.begin(), __il.end()); | 
|  | } | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 14 | 
|  | _LIBCPP_HIDE_FROM_ABI set(initializer_list<value_type> __il, const allocator_type& __a) | 
|  | : set(__il, key_compare(), __a) {} | 
|  | #    endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set& operator=(initializer_list<value_type> __il) { | 
|  | __tree_.__assign_unique(__il.begin(), __il.end()); | 
|  | return *this; | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI set& operator=(set&& __s) noexcept(is_nothrow_move_assignable<__base>::value) { | 
|  | __tree_ = std::move(__s.__tree_); | 
|  | return *this; | 
|  | } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI ~set() { static_assert(sizeof(std::__diagnose_non_const_comparator<_Key, _Compare>()), ""); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator begin() _NOEXCEPT { return __tree_.begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return __tree_.begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator end() _NOEXCEPT { return __tree_.end(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return __tree_.end(); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI reverse_iterator rbegin() _NOEXCEPT { return reverse_iterator(end()); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(end()); } | 
|  | _LIBCPP_HIDE_FROM_ABI reverse_iterator rend() _NOEXCEPT { return reverse_iterator(begin()); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(begin()); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { return begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { return end(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { return rbegin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { return rend(); } | 
|  |  | 
|  | [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool empty() const _NOEXCEPT { return __tree_.size() == 0; } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return __tree_.size(); } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { return __tree_.max_size(); } | 
|  |  | 
|  | // modifiers: | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | template <class... _Args> | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, bool> emplace(_Args&&... __args) { | 
|  | return __tree_.__emplace_unique(std::forward<_Args>(__args)...); | 
|  | } | 
|  | template <class... _Args> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator emplace_hint(const_iterator __p, _Args&&... __args) { | 
|  | return __tree_.__emplace_hint_unique(__p, std::forward<_Args>(__args)...); | 
|  | } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, bool> insert(const value_type& __v) { return __tree_.__insert_unique(__v); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __p, const value_type& __v) { | 
|  | return __tree_.__insert_unique(__p, __v); | 
|  | } | 
|  |  | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __f, _InputIterator __l) { | 
|  | for (const_iterator __e = cend(); __f != __l; ++__f) | 
|  | __tree_.__insert_unique(__e, *__f); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 23 | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI void insert_range(_Range&& __range) { | 
|  | const_iterator __end = cend(); | 
|  | for (auto&& __element : __range) { | 
|  | __tree_.__insert_unique(__end, std::forward<decltype(__element)>(__element)); | 
|  | } | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, bool> insert(value_type&& __v) { | 
|  | return __tree_.__insert_unique(std::move(__v)); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __p, value_type&& __v) { | 
|  | return __tree_.__insert_unique(__p, std::move(__v)); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI void insert(initializer_list<value_type> __il) { insert(__il.begin(), __il.end()); } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __p) { return __tree_.erase(__p); } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type erase(const key_type& __k) { return __tree_.__erase_unique(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __f, const_iterator __l) { return __tree_.erase(__f, __l); } | 
|  | _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT { __tree_.clear(); } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | _LIBCPP_HIDE_FROM_ABI insert_return_type insert(node_type&& __nh) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(__nh.empty() || __nh.get_allocator() == get_allocator(), | 
|  | "node_type with incompatible allocator passed to set::insert()"); | 
|  | return __tree_.template __node_handle_insert_unique< node_type, insert_return_type>(std::move(__nh)); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __hint, node_type&& __nh) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(__nh.empty() || __nh.get_allocator() == get_allocator(), | 
|  | "node_type with incompatible allocator passed to set::insert()"); | 
|  | return __tree_.template __node_handle_insert_unique<node_type>(__hint, std::move(__nh)); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI node_type extract(key_type const& __key) { | 
|  | return __tree_.template __node_handle_extract<node_type>(__key); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI node_type extract(const_iterator __it) { | 
|  | return __tree_.template __node_handle_extract<node_type>(__it); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(set<key_type, _Compare2, allocator_type>& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_unique(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(set<key_type, _Compare2, allocator_type>&& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_unique(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(multiset<key_type, _Compare2, allocator_type>& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_unique(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(multiset<key_type, _Compare2, allocator_type>&& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_unique(__source.__tree_); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI void swap(set& __s) _NOEXCEPT_(__is_nothrow_swappable_v<__base>) { __tree_.swap(__s.__tree_); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI allocator_type get_allocator() const _NOEXCEPT { return __tree_.__alloc(); } | 
|  | _LIBCPP_HIDE_FROM_ABI key_compare key_comp() const { return __tree_.value_comp(); } | 
|  | _LIBCPP_HIDE_FROM_ABI value_compare value_comp() const { return __tree_.value_comp(); } | 
|  |  | 
|  | // set operations: | 
|  | _LIBCPP_HIDE_FROM_ABI iterator find(const key_type& __k) { return __tree_.find(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator find(const key_type& __k) const { return __tree_.find(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator find(const _K2& __k) { | 
|  | return __tree_.find(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator find(const _K2& __k) const { | 
|  | return __tree_.find(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI size_type count(const key_type& __k) const { return __tree_.__count_unique(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI size_type count(const _K2& __k) const { | 
|  | return __tree_.__count_multi(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 20 | 
|  | _LIBCPP_HIDE_FROM_ABI bool contains(const key_type& __k) const { return find(__k) != end(); } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI bool contains(const _K2& __k) const { | 
|  | return find(__k) != end(); | 
|  | } | 
|  | #  endif // _LIBCPP_STD_VER >= 20 | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const key_type& __k) { return __tree_.lower_bound(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const key_type& __k) const { return __tree_.lower_bound(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const _K2& __k) { | 
|  | return __tree_.lower_bound(__k); | 
|  | } | 
|  |  | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const _K2& __k) const { | 
|  | return __tree_.lower_bound(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const key_type& __k) { return __tree_.upper_bound(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const key_type& __k) const { return __tree_.upper_bound(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const _K2& __k) { | 
|  | return __tree_.upper_bound(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const _K2& __k) const { | 
|  | return __tree_.upper_bound(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const key_type& __k) { | 
|  | return __tree_.__equal_range_unique(__k); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const key_type& __k) const { | 
|  | return __tree_.__equal_range_unique(__k); | 
|  | } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const _K2& __k) { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const _K2& __k) const { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | #  endif | 
|  | }; | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | template <class _InputIterator, | 
|  | class _Compare   = less<__iter_value_type<_InputIterator>>, | 
|  | class _Allocator = allocator<__iter_value_type<_InputIterator>>, | 
|  | class            = enable_if_t<__has_input_iterator_category<_InputIterator>::value, void>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>> | 
|  | set(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator()) | 
|  | -> set<__iter_value_type<_InputIterator>, _Compare, _Allocator>; | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 23 | 
|  | template <ranges::input_range _Range, | 
|  | class _Compare   = less<ranges::range_value_t<_Range>>, | 
|  | class _Allocator = allocator<ranges::range_value_t<_Range>>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>> | 
|  | set(from_range_t, _Range&&, _Compare = _Compare(), _Allocator = _Allocator()) | 
|  | -> set<ranges::range_value_t<_Range>, _Compare, _Allocator>; | 
|  | #    endif | 
|  |  | 
|  | template <class _Key, | 
|  | class _Compare   = less<_Key>, | 
|  | class _Allocator = allocator<_Key>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | set(initializer_list<_Key>, _Compare = _Compare(), _Allocator = _Allocator()) -> set<_Key, _Compare, _Allocator>; | 
|  |  | 
|  | template <class _InputIterator, | 
|  | class _Allocator, | 
|  | class = enable_if_t<__has_input_iterator_category<_InputIterator>::value, void>, | 
|  | class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | set(_InputIterator, | 
|  | _InputIterator, | 
|  | _Allocator) -> set<__iter_value_type<_InputIterator>, less<__iter_value_type<_InputIterator>>, _Allocator>; | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 23 | 
|  | template <ranges::input_range _Range, class _Allocator, class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | set(from_range_t, | 
|  | _Range&&, | 
|  | _Allocator) -> set<ranges::range_value_t<_Range>, less<ranges::range_value_t<_Range>>, _Allocator>; | 
|  | #    endif | 
|  |  | 
|  | template <class _Key, class _Allocator, class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | set(initializer_list<_Key>, _Allocator) -> set<_Key, less<_Key>, _Allocator>; | 
|  | #  endif | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | set<_Key, _Compare, _Allocator>::set(set&& __s, const allocator_type& __a) : __tree_(std::move(__s.__tree_), __a) { | 
|  | if (__a != __s.get_allocator()) { | 
|  | const_iterator __e = cend(); | 
|  | while (!__s.empty()) | 
|  | insert(__e, std::move(__s.__tree_.remove(__s.begin())->__value_)); | 
|  | } | 
|  | } | 
|  |  | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator==(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return __x.size() == __y.size() && std::equal(__x.begin(), __x.end(), __y.begin()); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator<(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return std::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end()); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator!=(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__x == __y); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator>(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return __y < __x; | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator>=(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__x < __y); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator<=(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__y < __x); | 
|  | } | 
|  |  | 
|  | #  else // _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | _LIBCPP_HIDE_FROM_ABI __synth_three_way_result<_Key> | 
|  | operator<=>(const set<_Key, _Compare, _Allocator>& __x, const set<_Key, _Compare, _Allocator>& __y) { | 
|  | return std::lexicographical_compare_three_way(__x.begin(), __x.end(), __y.begin(), __y.end(), std::__synth_three_way); | 
|  | } | 
|  |  | 
|  | #  endif // _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | // specialized algorithms: | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI void swap(set<_Key, _Compare, _Allocator>& __x, set<_Key, _Compare, _Allocator>& __y) | 
|  | _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) { | 
|  | __x.swap(__y); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 20 | 
|  | template <class _Key, class _Compare, class _Allocator, class _Predicate> | 
|  | inline _LIBCPP_HIDE_FROM_ABI typename set<_Key, _Compare, _Allocator>::size_type | 
|  | erase_if(set<_Key, _Compare, _Allocator>& __c, _Predicate __pred) { | 
|  | return std::__libcpp_erase_if_container(__c, __pred); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | struct __container_traits<set<_Key, _Compare, _Allocator> > { | 
|  | // http://eel.is/c++draft/associative.reqmts.except#2 | 
|  | // For associative containers, if an exception is thrown by any operation from within | 
|  | // an insert or emplace function inserting a single element, the insertion has no effect. | 
|  | static _LIBCPP_CONSTEXPR const bool __emplacement_has_strong_exception_safety_guarantee = true; | 
|  |  | 
|  | static _LIBCPP_CONSTEXPR const bool __reservable = false; | 
|  | }; | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | class multiset { | 
|  | public: | 
|  | // types: | 
|  | typedef _Key key_type; | 
|  | typedef key_type value_type; | 
|  | typedef __type_identity_t<_Compare> key_compare; | 
|  | typedef key_compare value_compare; | 
|  | typedef __type_identity_t<_Allocator> allocator_type; | 
|  | typedef value_type& reference; | 
|  | typedef const value_type& const_reference; | 
|  |  | 
|  | static_assert(is_same<typename allocator_type::value_type, value_type>::value, | 
|  | "Allocator::value_type must be same type as value_type"); | 
|  |  | 
|  | private: | 
|  | typedef __tree<value_type, value_compare, allocator_type> __base; | 
|  | typedef allocator_traits<allocator_type> __alloc_traits; | 
|  |  | 
|  | static_assert(__check_valid_allocator<allocator_type>::value, ""); | 
|  |  | 
|  | __base __tree_; | 
|  |  | 
|  | public: | 
|  | typedef typename __base::pointer pointer; | 
|  | typedef typename __base::const_pointer const_pointer; | 
|  | typedef typename __base::size_type size_type; | 
|  | typedef typename __base::difference_type difference_type; | 
|  | typedef typename __base::const_iterator iterator; | 
|  | typedef typename __base::const_iterator const_iterator; | 
|  | typedef std::reverse_iterator<iterator> reverse_iterator; | 
|  | typedef std::reverse_iterator<const_iterator> const_reverse_iterator; | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | typedef __set_node_handle<typename __base::__node, allocator_type> node_type; | 
|  | #  endif | 
|  |  | 
|  | template <class _Key2, class _Compare2, class _Alloc2> | 
|  | friend class set; | 
|  | template <class _Key2, class _Compare2, class _Alloc2> | 
|  | friend class multiset; | 
|  |  | 
|  | // construct/copy/destroy: | 
|  | _LIBCPP_HIDE_FROM_ABI multiset() _NOEXCEPT_( | 
|  | is_nothrow_default_constructible<allocator_type>::value&& is_nothrow_default_constructible<key_compare>::value&& | 
|  | is_nothrow_copy_constructible<key_compare>::value) | 
|  | : __tree_(value_compare()) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI explicit multiset(const value_compare& __comp) _NOEXCEPT_( | 
|  | is_nothrow_default_constructible<allocator_type>::value&& is_nothrow_copy_constructible<key_compare>::value) | 
|  | : __tree_(__comp) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI explicit multiset(const value_compare& __comp, const allocator_type& __a) | 
|  | : __tree_(__comp, __a) {} | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(_InputIterator __f, _InputIterator __l, const value_compare& __comp = value_compare()) | 
|  | : __tree_(__comp) { | 
|  | insert(__f, __l); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(_InputIterator __f, _InputIterator __l, const allocator_type& __a) | 
|  | : multiset(__f, __l, key_compare(), __a) {} | 
|  | #  endif | 
|  |  | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI | 
|  | multiset(_InputIterator __f, _InputIterator __l, const value_compare& __comp, const allocator_type& __a) | 
|  | : __tree_(__comp, __a) { | 
|  | insert(__f, __l); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 23 | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI | 
|  | multiset(from_range_t, | 
|  | _Range&& __range, | 
|  | const key_compare& __comp = key_compare(), | 
|  | const allocator_type& __a = allocator_type()) | 
|  | : __tree_(__comp, __a) { | 
|  | insert_range(std::forward<_Range>(__range)); | 
|  | } | 
|  |  | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(from_range_t, _Range&& __range, const allocator_type& __a) | 
|  | : multiset(from_range, std::forward<_Range>(__range), key_compare(), __a) {} | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(const multiset& __s) | 
|  | : __tree_(__s.__tree_.value_comp(), | 
|  | __alloc_traits::select_on_container_copy_construction(__s.__tree_.__alloc())) { | 
|  | insert(__s.begin(), __s.end()); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI multiset& operator=(const multiset& __s) { | 
|  | __tree_ = __s.__tree_; | 
|  | return *this; | 
|  | } | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s) noexcept(is_nothrow_move_constructible<__base>::value) | 
|  | : __tree_(std::move(__s.__tree_)) {} | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(multiset&& __s, const allocator_type& __a); | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI explicit multiset(const allocator_type& __a) : __tree_(__a) {} | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(const multiset& __s, const allocator_type& __a) | 
|  | : __tree_(__s.__tree_.value_comp(), __a) { | 
|  | insert(__s.begin(), __s.end()); | 
|  | } | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(initializer_list<value_type> __il, const value_compare& __comp = value_compare()) | 
|  | : __tree_(__comp) { | 
|  | insert(__il.begin(), __il.end()); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI | 
|  | multiset(initializer_list<value_type> __il, const value_compare& __comp, const allocator_type& __a) | 
|  | : __tree_(__comp, __a) { | 
|  | insert(__il.begin(), __il.end()); | 
|  | } | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 14 | 
|  | _LIBCPP_HIDE_FROM_ABI multiset(initializer_list<value_type> __il, const allocator_type& __a) | 
|  | : multiset(__il, key_compare(), __a) {} | 
|  | #    endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI multiset& operator=(initializer_list<value_type> __il) { | 
|  | __tree_.__assign_multi(__il.begin(), __il.end()); | 
|  | return *this; | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI multiset& operator=(multiset&& __s) _NOEXCEPT_(is_nothrow_move_assignable<__base>::value) { | 
|  | __tree_ = std::move(__s.__tree_); | 
|  | return *this; | 
|  | } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI ~multiset() { | 
|  | static_assert(sizeof(std::__diagnose_non_const_comparator<_Key, _Compare>()), ""); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator begin() _NOEXCEPT { return __tree_.begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator begin() const _NOEXCEPT { return __tree_.begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator end() _NOEXCEPT { return __tree_.end(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator end() const _NOEXCEPT { return __tree_.end(); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI reverse_iterator rbegin() _NOEXCEPT { return reverse_iterator(end()); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rbegin() const _NOEXCEPT { return const_reverse_iterator(end()); } | 
|  | _LIBCPP_HIDE_FROM_ABI reverse_iterator rend() _NOEXCEPT { return reverse_iterator(begin()); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator rend() const _NOEXCEPT { return const_reverse_iterator(begin()); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator cbegin() const _NOEXCEPT { return begin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator cend() const _NOEXCEPT { return end(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crbegin() const _NOEXCEPT { return rbegin(); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_reverse_iterator crend() const _NOEXCEPT { return rend(); } | 
|  |  | 
|  | [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI bool empty() const _NOEXCEPT { return __tree_.size() == 0; } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type size() const _NOEXCEPT { return __tree_.size(); } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type max_size() const _NOEXCEPT { return __tree_.max_size(); } | 
|  |  | 
|  | // modifiers: | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | template <class... _Args> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator emplace(_Args&&... __args) { | 
|  | return __tree_.__emplace_multi(std::forward<_Args>(__args)...); | 
|  | } | 
|  | template <class... _Args> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator emplace_hint(const_iterator __p, _Args&&... __args) { | 
|  | return __tree_.__emplace_hint_multi(__p, std::forward<_Args>(__args)...); | 
|  | } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const value_type& __v) { return __tree_.__insert_multi(__v); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __p, const value_type& __v) { | 
|  | return __tree_.__insert_multi(__p, __v); | 
|  | } | 
|  |  | 
|  | template <class _InputIterator> | 
|  | _LIBCPP_HIDE_FROM_ABI void insert(_InputIterator __f, _InputIterator __l) { | 
|  | for (const_iterator __e = cend(); __f != __l; ++__f) | 
|  | __tree_.__insert_multi(__e, *__f); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 23 | 
|  | template <_ContainerCompatibleRange<value_type> _Range> | 
|  | _LIBCPP_HIDE_FROM_ABI void insert_range(_Range&& __range) { | 
|  | const_iterator __end = cend(); | 
|  | for (auto&& __element : __range) { | 
|  | __tree_.__insert_multi(__end, std::forward<decltype(__element)>(__element)); | 
|  | } | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(value_type&& __v) { return __tree_.__insert_multi(std::move(__v)); } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __p, value_type&& __v) { | 
|  | return __tree_.__insert_multi(__p, std::move(__v)); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI void insert(initializer_list<value_type> __il) { insert(__il.begin(), __il.end()); } | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __p) { return __tree_.erase(__p); } | 
|  | _LIBCPP_HIDE_FROM_ABI size_type erase(const key_type& __k) { return __tree_.__erase_multi(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator erase(const_iterator __f, const_iterator __l) { return __tree_.erase(__f, __l); } | 
|  | _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT { __tree_.clear(); } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(node_type&& __nh) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(__nh.empty() || __nh.get_allocator() == get_allocator(), | 
|  | "node_type with incompatible allocator passed to multiset::insert()"); | 
|  | return __tree_.template __node_handle_insert_multi<node_type>(std::move(__nh)); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI iterator insert(const_iterator __hint, node_type&& __nh) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR(__nh.empty() || __nh.get_allocator() == get_allocator(), | 
|  | "node_type with incompatible allocator passed to multiset::insert()"); | 
|  | return __tree_.template __node_handle_insert_multi<node_type>(__hint, std::move(__nh)); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI node_type extract(key_type const& __key) { | 
|  | return __tree_.template __node_handle_extract<node_type>(__key); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI node_type extract(const_iterator __it) { | 
|  | return __tree_.template __node_handle_extract<node_type>(__it); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(multiset<key_type, _Compare2, allocator_type>& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_multi(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(multiset<key_type, _Compare2, allocator_type>&& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_multi(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(set<key_type, _Compare2, allocator_type>& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_multi(__source.__tree_); | 
|  | } | 
|  | template <class _Compare2> | 
|  | _LIBCPP_HIDE_FROM_ABI void merge(set<key_type, _Compare2, allocator_type>&& __source) { | 
|  | _LIBCPP_ASSERT_COMPATIBLE_ALLOCATOR( | 
|  | __source.get_allocator() == get_allocator(), "merging container with incompatible allocator"); | 
|  | __tree_.__node_handle_merge_multi(__source.__tree_); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI void swap(multiset& __s) _NOEXCEPT_(__is_nothrow_swappable_v<__base>) { | 
|  | __tree_.swap(__s.__tree_); | 
|  | } | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI allocator_type get_allocator() const _NOEXCEPT { return __tree_.__alloc(); } | 
|  | _LIBCPP_HIDE_FROM_ABI key_compare key_comp() const { return __tree_.value_comp(); } | 
|  | _LIBCPP_HIDE_FROM_ABI value_compare value_comp() const { return __tree_.value_comp(); } | 
|  |  | 
|  | // set operations: | 
|  | _LIBCPP_HIDE_FROM_ABI iterator find(const key_type& __k) { return __tree_.find(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator find(const key_type& __k) const { return __tree_.find(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator find(const _K2& __k) { | 
|  | return __tree_.find(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator find(const _K2& __k) const { | 
|  | return __tree_.find(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI size_type count(const key_type& __k) const { return __tree_.__count_multi(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI size_type count(const _K2& __k) const { | 
|  | return __tree_.__count_multi(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 20 | 
|  | _LIBCPP_HIDE_FROM_ABI bool contains(const key_type& __k) const { return find(__k) != end(); } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI bool contains(const _K2& __k) const { | 
|  | return find(__k) != end(); | 
|  | } | 
|  | #  endif // _LIBCPP_STD_VER >= 20 | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const key_type& __k) { return __tree_.lower_bound(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const key_type& __k) const { return __tree_.lower_bound(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator lower_bound(const _K2& __k) { | 
|  | return __tree_.lower_bound(__k); | 
|  | } | 
|  |  | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator lower_bound(const _K2& __k) const { | 
|  | return __tree_.lower_bound(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const key_type& __k) { return __tree_.upper_bound(__k); } | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const key_type& __k) const { return __tree_.upper_bound(__k); } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI iterator upper_bound(const _K2& __k) { | 
|  | return __tree_.upper_bound(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI const_iterator upper_bound(const _K2& __k) const { | 
|  | return __tree_.upper_bound(__k); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const key_type& __k) { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const key_type& __k) const { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | #  if _LIBCPP_STD_VER >= 14 | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI pair<iterator, iterator> equal_range(const _K2& __k) { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | template <typename _K2, enable_if_t<__is_transparent_v<_Compare, _K2>, int> = 0> | 
|  | _LIBCPP_HIDE_FROM_ABI pair<const_iterator, const_iterator> equal_range(const _K2& __k) const { | 
|  | return __tree_.__equal_range_multi(__k); | 
|  | } | 
|  | #  endif | 
|  | }; | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | template <class _InputIterator, | 
|  | class _Compare   = less<__iter_value_type<_InputIterator>>, | 
|  | class _Allocator = allocator<__iter_value_type<_InputIterator>>, | 
|  | class            = enable_if_t<__has_input_iterator_category<_InputIterator>::value, void>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>> | 
|  | multiset(_InputIterator, _InputIterator, _Compare = _Compare(), _Allocator = _Allocator()) | 
|  | -> multiset<__iter_value_type<_InputIterator>, _Compare, _Allocator>; | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 23 | 
|  | template <ranges::input_range _Range, | 
|  | class _Compare   = less<ranges::range_value_t<_Range>>, | 
|  | class _Allocator = allocator<ranges::range_value_t<_Range>>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>> | 
|  | multiset(from_range_t, _Range&&, _Compare = _Compare(), _Allocator = _Allocator()) | 
|  | -> multiset<ranges::range_value_t<_Range>, _Compare, _Allocator>; | 
|  | #    endif | 
|  |  | 
|  | template <class _Key, | 
|  | class _Compare   = less<_Key>, | 
|  | class _Allocator = allocator<_Key>, | 
|  | class            = enable_if_t<__is_allocator<_Allocator>::value, void>, | 
|  | class            = enable_if_t<!__is_allocator<_Compare>::value, void>> | 
|  | multiset(initializer_list<_Key>, | 
|  | _Compare   = _Compare(), | 
|  | _Allocator = _Allocator()) -> multiset<_Key, _Compare, _Allocator>; | 
|  |  | 
|  | template <class _InputIterator, | 
|  | class _Allocator, | 
|  | class = enable_if_t<__has_input_iterator_category<_InputIterator>::value, void>, | 
|  | class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | multiset(_InputIterator, _InputIterator, _Allocator) | 
|  | -> multiset<__iter_value_type<_InputIterator>, less<__iter_value_type<_InputIterator>>, _Allocator>; | 
|  |  | 
|  | #    if _LIBCPP_STD_VER >= 23 | 
|  | template <ranges::input_range _Range, class _Allocator, class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | multiset(from_range_t, | 
|  | _Range&&, | 
|  | _Allocator) -> multiset<ranges::range_value_t<_Range>, less<ranges::range_value_t<_Range>>, _Allocator>; | 
|  | #    endif | 
|  |  | 
|  | template <class _Key, class _Allocator, class = enable_if_t<__is_allocator<_Allocator>::value, void>> | 
|  | multiset(initializer_list<_Key>, _Allocator) -> multiset<_Key, less<_Key>, _Allocator>; | 
|  | #  endif | 
|  |  | 
|  | #  ifndef _LIBCPP_CXX03_LANG | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | multiset<_Key, _Compare, _Allocator>::multiset(multiset&& __s, const allocator_type& __a) | 
|  | : __tree_(std::move(__s.__tree_), __a) { | 
|  | if (__a != __s.get_allocator()) { | 
|  | const_iterator __e = cend(); | 
|  | while (!__s.empty()) | 
|  | insert(__e, std::move(__s.__tree_.remove(__s.begin())->__value_)); | 
|  | } | 
|  | } | 
|  |  | 
|  | #  endif // _LIBCPP_CXX03_LANG | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator==(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return __x.size() == __y.size() && std::equal(__x.begin(), __x.end(), __y.begin()); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator<(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return std::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end()); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator!=(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__x == __y); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator>(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return __y < __x; | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator>=(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__x < __y); | 
|  | } | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI bool | 
|  | operator<=(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return !(__y < __x); | 
|  | } | 
|  |  | 
|  | #  else // _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | _LIBCPP_HIDE_FROM_ABI __synth_three_way_result<_Key> | 
|  | operator<=>(const multiset<_Key, _Compare, _Allocator>& __x, const multiset<_Key, _Compare, _Allocator>& __y) { | 
|  | return std::lexicographical_compare_three_way(__x.begin(), __x.end(), __y.begin(), __y.end(), __synth_three_way); | 
|  | } | 
|  |  | 
|  | #  endif // _LIBCPP_STD_VER <= 17 | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | inline _LIBCPP_HIDE_FROM_ABI void | 
|  | swap(multiset<_Key, _Compare, _Allocator>& __x, multiset<_Key, _Compare, _Allocator>& __y) | 
|  | _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y))) { | 
|  | __x.swap(__y); | 
|  | } | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 20 | 
|  | template <class _Key, class _Compare, class _Allocator, class _Predicate> | 
|  | inline _LIBCPP_HIDE_FROM_ABI typename multiset<_Key, _Compare, _Allocator>::size_type | 
|  | erase_if(multiset<_Key, _Compare, _Allocator>& __c, _Predicate __pred) { | 
|  | return std::__libcpp_erase_if_container(__c, __pred); | 
|  | } | 
|  | #  endif | 
|  |  | 
|  | template <class _Key, class _Compare, class _Allocator> | 
|  | struct __container_traits<multiset<_Key, _Compare, _Allocator> > { | 
|  | // http://eel.is/c++draft/associative.reqmts.except#2 | 
|  | // For associative containers, if an exception is thrown by any operation from within | 
|  | // an insert or emplace function inserting a single element, the insertion has no effect. | 
|  | static _LIBCPP_CONSTEXPR const bool __emplacement_has_strong_exception_safety_guarantee = true; | 
|  |  | 
|  | static _LIBCPP_CONSTEXPR const bool __reservable = false; | 
|  | }; | 
|  |  | 
|  | _LIBCPP_END_NAMESPACE_STD | 
|  |  | 
|  | #  if _LIBCPP_STD_VER >= 17 | 
|  | _LIBCPP_BEGIN_NAMESPACE_STD | 
|  | namespace pmr { | 
|  | template <class _KeyT, class _CompareT = std::less<_KeyT>> | 
|  | using set _LIBCPP_AVAILABILITY_PMR = std::set<_KeyT, _CompareT, polymorphic_allocator<_KeyT>>; | 
|  |  | 
|  | template <class _KeyT, class _CompareT = std::less<_KeyT>> | 
|  | using multiset _LIBCPP_AVAILABILITY_PMR = std::multiset<_KeyT, _CompareT, polymorphic_allocator<_KeyT>>; | 
|  | } // namespace pmr | 
|  | _LIBCPP_END_NAMESPACE_STD | 
|  | #  endif | 
|  |  | 
|  | _LIBCPP_POP_MACROS | 
|  |  | 
|  | #  if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 | 
|  | #    include <concepts> | 
|  | #    include <cstdlib> | 
|  | #    include <functional> | 
|  | #    include <iterator> | 
|  | #    include <stdexcept> | 
|  | #    include <type_traits> | 
|  | #  endif | 
|  | #endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS) | 
|  |  | 
|  | #endif // _LIBCPP_SET |