include/map

// -*- C++ -*-
//===----------------------------- map ------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_MAP
#define _LIBCPP_MAP

/*

 map synopsis

namespace std
{

template <class Key, class T, class Compare = less<Key>,
 class Allocator = allocator<pair<const Key, T>>>
class map
{
public:
 // types:
 typedef Key key_type;
 typedef T mapped_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef Compare key_compare;
 typedef Allocator allocator_type;
 typedef typename allocator_type::reference reference;
 typedef typename allocator_type::const_reference const_reference;
 typedef typename allocator_type::pointer pointer;
 typedef typename allocator_type::const_pointer const_pointer;
 typedef typename allocator_type::size_type size_type;
 typedef typename allocator_type::difference_type difference_type;

 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;

 class value_compare
 : public binary_function<value_type, value_type, bool>
 {
 friend class map;
 protected:
 key_compare comp;

 value_compare(key_compare c);
 public:
 bool operator()(const value_type& x, const value_type& y) const;
 };

 // construct/copy/destroy:
 map()
 noexcept(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_default_constructible<key_compare>::value &&
 is_nothrow_copy_constructible<key_compare>::value);
 explicit map(const key_compare& comp);
 map(const key_compare& comp, const allocator_type& a);
 template <class InputIterator>
 map(InputIterator first, InputIterator last,
 const key_compare& comp = key_compare());
 template <class InputIterator>
 map(InputIterator first, InputIterator last,
 const key_compare& comp, const allocator_type& a);
 map(const map& m);
 map(map&& m)
 noexcept(
 is_nothrow_move_constructible<allocator_type>::value &&
 is_nothrow_move_constructible<key_compare>::value);
 explicit map(const allocator_type& a);
 map(const map& m, const allocator_type& a);
 map(map&& m, const allocator_type& a);
 map(initializer_list<value_type> il, const key_compare& comp = key_compare());
 map(initializer_list<value_type> il, const key_compare& comp, const allocator_type& a);
 template <class InputIterator>
 map(InputIterator first, InputIterator last, const allocator_type& a)
 : map(first, last, Compare(), a) {} // C++14
 map(initializer_list<value_type> il, const allocator_type& a)
 : map(il, Compare(), a) {} // C++14
 ~map();

 map& operator=(const map& m);
 map& operator=(map&& m)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value &&
 is_nothrow_move_assignable<key_compare>::value);
 map& 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;

 // element access:
 mapped_type& operator[](const key_type& k);
 mapped_type& operator[](key_type&& k);

 mapped_type& at(const key_type& k);
 const mapped_type& at(const key_type& k) const;

 // 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); // C++17
 template <class P>
 pair<iterator, bool> insert(P&& p);
 iterator insert(const_iterator position, const value_type& v);
 iterator insert(const_iterator position, value_type&& v); // C++17
 template <class P>
 iterator insert(const_iterator position, P&& p);
 template <class InputIterator>
 void insert(InputIterator first, InputIterator last);
 void insert(initializer_list<value_type> il);

 template <class... Args>
 pair<iterator, bool> try_emplace(const key_type& k, Args&&... args); // C++17
 template <class... Args>
 pair<iterator, bool> try_emplace(key_type&& k, Args&&... args); // C++17
 template <class... Args>
 iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); // C++17
 template <class... Args>
 iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args); // C++17
 template <class M>
 pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj); // C++17
 template <class M>
 pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj); // C++17
 template <class M>
 iterator insert_or_assign(const_iterator hint, const key_type& k, M&& obj); // C++17
 template <class M>
 iterator insert_or_assign(const_iterator hint, key_type&& k, M&& obj); // 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;

 void swap(map& m)
 noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
 is_nothrow_swappable<key_compare>::value); // C++17

 // observers:
 allocator_type get_allocator() const noexcept;
 key_compare key_comp() const;
 value_compare value_comp() const;

 // map operations:
 iterator find(const key_type& k);
 const_iterator find(const key_type& k) const;
 template<typename K>
 iterator find(const K& x); // C++14
 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;
 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 Key, class T, class Compare, class Allocator>
bool
operator==(const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator< (const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator!=(const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator> (const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator>=(const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator<=(const map<Key, T, Compare, Allocator>& x,
 const map<Key, T, Compare, Allocator>& y);

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void
swap(map<Key, T, Compare, Allocator>& x, map<Key, T, Compare, Allocator>& y)
 noexcept(noexcept(x.swap(y)));

template <class Key, class T, class Compare = less<Key>,
 class Allocator = allocator<pair<const Key, T>>>
class multimap
{
public:
 // types:
 typedef Key key_type;
 typedef T mapped_type;
 typedef pair<const key_type,mapped_type> value_type;
 typedef Compare key_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;

 class value_compare
 : public binary_function<value_type,value_type,bool>
 {
 friend class multimap;
 protected:
 key_compare comp;
 value_compare(key_compare c);
 public:
 bool operator()(const value_type& x, const value_type& y) const;
 };

 // construct/copy/destroy:
 multimap()
 noexcept(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_default_constructible<key_compare>::value &&
 is_nothrow_copy_constructible<key_compare>::value);
 explicit multimap(const key_compare& comp);
 multimap(const key_compare& comp, const allocator_type& a);
 template <class InputIterator>
 multimap(InputIterator first, InputIterator last, const key_compare& comp);
 template <class InputIterator>
 multimap(InputIterator first, InputIterator last, const key_compare& comp,
 const allocator_type& a);
 multimap(const multimap& m);
 multimap(multimap&& m)
 noexcept(
 is_nothrow_move_constructible<allocator_type>::value &&
 is_nothrow_move_constructible<key_compare>::value);
 explicit multimap(const allocator_type& a);
 multimap(const multimap& m, const allocator_type& a);
 multimap(multimap&& m, const allocator_type& a);
 multimap(initializer_list<value_type> il, const key_compare& comp = key_compare());
 multimap(initializer_list<value_type> il, const key_compare& comp,
 const allocator_type& a);
 template <class InputIterator>
 multimap(InputIterator first, InputIterator last, const allocator_type& a)
 : multimap(first, last, Compare(), a) {} // C++14
 multimap(initializer_list<value_type> il, const allocator_type& a)
 : multimap(il, Compare(), a) {} // C++14
 ~multimap();

 multimap& operator=(const multimap& m);
 multimap& operator=(multimap&& m)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value &&
 is_nothrow_move_assignable<key_compare>::value);
 multimap& 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); // C++17
 template <class P>
 iterator insert(P&& p);
 iterator insert(const_iterator position, const value_type& v);
 iterator insert(const_iterator position, value_type&& v); // C++17
 template <class P>
 iterator insert(const_iterator position, P&& p);
 template <class InputIterator>
 void insert(InputIterator first, InputIterator last);
 void insert(initializer_list<value_type> il);

 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;

 void swap(multimap& m)
 noexcept(allocator_traits<allocator_type>::is_always_equal::value &&
 is_nothrow_swappable<key_compare>::value); // C++17

 // observers:
 allocator_type get_allocator() const noexcept;
 key_compare key_comp() const;
 value_compare value_comp() const;

 // map operations:
 iterator find(const key_type& k);
 const_iterator find(const key_type& k) const;
 template<typename K>
 iterator find(const K& x); // C++14
 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;
 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 Key, class T, class Compare, class Allocator>
bool
operator==(const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator< (const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator!=(const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator> (const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator>=(const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

template <class Key, class T, class Compare, class Allocator>
bool
operator<=(const multimap<Key, T, Compare, Allocator>& x,
 const multimap<Key, T, Compare, Allocator>& y);

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void
swap(multimap<Key, T, Compare, Allocator>& x,
 multimap<Key, T, Compare, Allocator>& y)
 noexcept(noexcept(x.swap(y)));

} // std

*/

#include <__config>
#include <__tree>
#include <iterator>
#include <memory>
#include <utility>
#include <functional>
#include <initializer_list>
#include <type_traits>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Key, class _CP, class _Compare, bool _IsSmall>
class __map_value_compare
 : private _Compare
{
public:
 _LIBCPP_INLINE_VISIBILITY
 __map_value_compare()
 _NOEXCEPT_(is_nothrow_default_constructible<_Compare>::value)
 : _Compare() {}
 _LIBCPP_INLINE_VISIBILITY
 __map_value_compare(_Compare c)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Compare>::value)
 : _Compare(c) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Compare& key_comp() const _NOEXCEPT {return *this;}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _CP& __x, const _CP& __y) const
 {return static_cast<const _Compare&>(*this)(__x.__cc.first, __y.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _CP& __x, const _Key& __y) const
 {return static_cast<const _Compare&>(*this)(__x.__cc.first, __y);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Key& __x, const _CP& __y) const
 {return static_cast<const _Compare&>(*this)(__x, __y.__cc.first);}
 void swap(__map_value_compare&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Compare>::value)
 {
 using _VSTD::swap;
 swap(static_cast<_Compare&>(*this), static_cast<_Compare&>(__y));
 }

#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
 operator () ( const _K2& __x, const _CP& __y ) const
 {return static_cast<const _Compare&>(*this) (__x, __y.__cc.first);}

 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
 operator () (const _CP& __x, const _K2& __y) const
 {return static_cast<const _Compare&>(*this) (__x.__cc.first, __y);}
#endif
};

template <class _Key, class _CP, class _Compare>
class __map_value_compare<_Key, _CP, _Compare, false>
{
 _Compare comp;

public:
 _LIBCPP_INLINE_VISIBILITY
 __map_value_compare()
 _NOEXCEPT_(is_nothrow_default_constructible<_Compare>::value)
 : comp() {}
 _LIBCPP_INLINE_VISIBILITY
 __map_value_compare(_Compare c)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Compare>::value)
 : comp(c) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Compare& key_comp() const _NOEXCEPT {return comp;}

 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _CP& __x, const _CP& __y) const
 {return comp(__x.__cc.first, __y.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _CP& __x, const _Key& __y) const
 {return comp(__x.__cc.first, __y);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Key& __x, const _CP& __y) const
 {return comp(__x, __y.__cc.first);}
 void swap(__map_value_compare&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Compare>::value)
 {
 using _VSTD::swap;
 swap(comp, __y.comp);
 }

#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
 operator () ( const _K2& __x, const _CP& __y ) const
 {return comp (__x, __y.__cc.first);}

 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value, bool>::type
 operator () (const _CP& __x, const _K2& __y) const
 {return comp (__x.__cc.first, __y);}
#endif
};

template <class _Key, class _CP, class _Compare, bool __b>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(__map_value_compare<_Key, _CP, _Compare, __b>& __x,
 __map_value_compare<_Key, _CP, _Compare, __b>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Allocator>
class __map_node_destructor
{
 typedef _Allocator allocator_type;
 typedef allocator_traits<allocator_type> __alloc_traits;

public:
 typedef typename __alloc_traits::pointer pointer;

private:
 allocator_type& __na_;

 __map_node_destructor& operator=(const __map_node_destructor&);

public:
 bool __first_constructed;
 bool __second_constructed;

 _LIBCPP_INLINE_VISIBILITY
 explicit __map_node_destructor(allocator_type& __na) _NOEXCEPT
 : __na_(__na),
 __first_constructed(false),
 __second_constructed(false)
 {}

#ifndef _LIBCPP_CXX03_LANG
 _LIBCPP_INLINE_VISIBILITY
 __map_node_destructor(__tree_node_destructor<allocator_type>&& __x) _NOEXCEPT
 : __na_(__x.__na_),
 __first_constructed(__x.__value_constructed),
 __second_constructed(__x.__value_constructed)
 {
 __x.__value_constructed = false;
 }
#endif // _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 void operator()(pointer __p) _NOEXCEPT
 {
 if (__second_constructed)
 __alloc_traits::destroy(__na_, _VSTD::addressof(__p->__value_.__cc.second));
 if (__first_constructed)
 __alloc_traits::destroy(__na_, _VSTD::addressof(__p->__value_.__cc.first));
 if (__p)
 __alloc_traits::deallocate(__na_, __p, 1);
 }
};

template <class _Key, class _Tp, class _Compare, class _Allocator>
 class map;
template <class _Key, class _Tp, class _Compare, class _Allocator>
 class multimap;
template <class _TreeIterator> class __map_const_iterator;

#ifndef _LIBCPP_CXX03_LANG

template <class _Key, class _Tp>
union __value_type
{
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef pair<key_type, mapped_type> __nc_value_type;

 value_type __cc;
 __nc_value_type __nc;

 _LIBCPP_INLINE_VISIBILITY
 __value_type& operator=(const __value_type& __v)
 {__nc = __v.__cc; return *this;}

 _LIBCPP_INLINE_VISIBILITY
 __value_type& operator=(__value_type&& __v)
 {__nc = _VSTD::move(__v.__nc); return *this;}

 template <class _ValueTp,
 class = typename enable_if<
 __is_same_uncvref<_ValueTp, value_type>::value
 >::type
 >
 _LIBCPP_INLINE_VISIBILITY
 __value_type& operator=(_ValueTp&& __v) {
 __nc = _VSTD::forward<_ValueTp>(__v); return *this;
 }

private:
 __value_type() _LIBCPP_EQUAL_DELETE;
 ~__value_type() _LIBCPP_EQUAL_DELETE;
 __value_type(const __value_type& __v) _LIBCPP_EQUAL_DELETE;
 __value_type(__value_type&& __v) _LIBCPP_EQUAL_DELETE;
};

#else

template <class _Key, class _Tp>
struct __value_type
{
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef pair<const key_type, mapped_type> value_type;

 value_type __cc;

private:
 __value_type();
 __value_type(__value_type const&);
 __value_type& operator=(__value_type const&);
 ~__value_type();
};

#endif // _LIBCPP_CXX03_LANG

template <class _Tp>
struct __extract_key_value_types;

template <class _Key, class _Tp>
struct __extract_key_value_types<__value_type<_Key, _Tp> >
{
 typedef _Key const __key_type;
 typedef _Tp __mapped_type;
};

template <class _TreeIterator>
class _LIBCPP_TEMPLATE_VIS __map_iterator
{
 typedef typename _TreeIterator::_NodeTypes _NodeTypes;
 typedef typename _TreeIterator::__pointer_traits __pointer_traits;

 _TreeIterator __i_;

public:
 typedef bidirectional_iterator_tag iterator_category;
 typedef typename _NodeTypes::__map_value_type value_type;
 typedef typename _TreeIterator::difference_type difference_type;
 typedef value_type& reference;
 typedef typename _NodeTypes::__map_value_type_pointer pointer;

 _LIBCPP_INLINE_VISIBILITY
 __map_iterator() _NOEXCEPT {}

 _LIBCPP_INLINE_VISIBILITY
 __map_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}

 _LIBCPP_INLINE_VISIBILITY
 reference operator*() const {return __i_->__cc;}
 _LIBCPP_INLINE_VISIBILITY
 pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__cc);}

 _LIBCPP_INLINE_VISIBILITY
 __map_iterator& operator++() {++__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __map_iterator operator++(int)
 {
 __map_iterator __t(*this);
 ++(*this);
 return __t;
 }

 _LIBCPP_INLINE_VISIBILITY
 __map_iterator& operator--() {--__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __map_iterator operator--(int)
 {
 __map_iterator __t(*this);
 --(*this);
 return __t;
 }

 friend _LIBCPP_INLINE_VISIBILITY
 bool operator==(const __map_iterator& __x, const __map_iterator& __y)
 {return __x.__i_ == __y.__i_;}
 friend
 _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const __map_iterator& __x, const __map_iterator& __y)
 {return __x.__i_ != __y.__i_;}

 template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
 template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
 template <class> friend class _LIBCPP_TEMPLATE_VIS __map_const_iterator;
};

template <class _TreeIterator>
class _LIBCPP_TEMPLATE_VIS __map_const_iterator
{
 typedef typename _TreeIterator::_NodeTypes _NodeTypes;
 typedef typename _TreeIterator::__pointer_traits __pointer_traits;

 _TreeIterator __i_;

public:
 typedef bidirectional_iterator_tag iterator_category;
 typedef typename _NodeTypes::__map_value_type value_type;
 typedef typename _TreeIterator::difference_type difference_type;
 typedef const value_type& reference;
 typedef typename _NodeTypes::__const_map_value_type_pointer pointer;

 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator() _NOEXCEPT {}

 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator(_TreeIterator __i) _NOEXCEPT : __i_(__i) {}
 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator(__map_iterator<
 typename _TreeIterator::__non_const_iterator> __i) _NOEXCEPT
 : __i_(__i.__i_) {}

 _LIBCPP_INLINE_VISIBILITY
 reference operator*() const {return __i_->__cc;}
 _LIBCPP_INLINE_VISIBILITY
 pointer operator->() const {return pointer_traits<pointer>::pointer_to(__i_->__cc);}

 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator& operator++() {++__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator operator++(int)
 {
 __map_const_iterator __t(*this);
 ++(*this);
 return __t;
 }

 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator& operator--() {--__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __map_const_iterator operator--(int)
 {
 __map_const_iterator __t(*this);
 --(*this);
 return __t;
 }

 friend _LIBCPP_INLINE_VISIBILITY
 bool operator==(const __map_const_iterator& __x, const __map_const_iterator& __y)
 {return __x.__i_ == __y.__i_;}
 friend _LIBCPP_INLINE_VISIBILITY
 bool operator!=(const __map_const_iterator& __x, const __map_const_iterator& __y)
 {return __x.__i_ != __y.__i_;}

 template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS map;
 template <class, class, class, class> friend class _LIBCPP_TEMPLATE_VIS multimap;
 template <class, class, class> friend class _LIBCPP_TEMPLATE_VIS __tree_const_iterator;
};

template <class _Key, class _Tp, class _Compare = less<_Key>,
 class _Allocator = allocator<pair<const _Key, _Tp> > >
class _LIBCPP_TEMPLATE_VIS map
{
public:
 // types:
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef pair<key_type, mapped_type> __nc_value_type;
 typedef _Compare key_compare;
 typedef _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");

 class _LIBCPP_TEMPLATE_VIS value_compare
 : public binary_function<value_type, value_type, bool>
 {
 friend class map;
 protected:
 key_compare comp;

 _LIBCPP_INLINE_VISIBILITY value_compare(key_compare c) : comp(c) {}
 public:
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const value_type& __x, const value_type& __y) const
 {return comp(__x.first, __y.first);}
 };

private:

 typedef _VSTD::__value_type<key_type, mapped_type> __value_type;
 typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
 typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
 __value_type>::type __allocator_type;
 typedef __tree<__value_type, __vc, __allocator_type> __base;
 typedef typename __base::__node_traits __node_traits;
 typedef allocator_traits<allocator_type> __alloc_traits;

 __base __tree_;

public:
 typedef typename __alloc_traits::pointer pointer;
 typedef typename __alloc_traits::const_pointer const_pointer;
 typedef typename __alloc_traits::size_type size_type;
 typedef typename __alloc_traits::difference_type difference_type;
 typedef __map_iterator<typename __base::iterator> iterator;
 typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;

 _LIBCPP_INLINE_VISIBILITY
 map()
 _NOEXCEPT_(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_default_constructible<key_compare>::value &&
 is_nothrow_copy_constructible<key_compare>::value)
 : __tree_(__vc(key_compare())) {}

 _LIBCPP_INLINE_VISIBILITY
 explicit map(const key_compare& __comp)
 _NOEXCEPT_(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_copy_constructible<key_compare>::value)
 : __tree_(__vc(__comp)) {}

 _LIBCPP_INLINE_VISIBILITY
 explicit map(const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 map(_InputIterator __f, _InputIterator __l,
 const key_compare& __comp = key_compare())
 : __tree_(__vc(__comp))
 {
 insert(__f, __l);
 }

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 map(_InputIterator __f, _InputIterator __l,
 const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a))
 {
 insert(__f, __l);
 }

#if _LIBCPP_STD_VER > 11
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 map(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
 : map(__f, __l, key_compare(), __a) {}
#endif

 _LIBCPP_INLINE_VISIBILITY
 map(const map& __m)
 : __tree_(__m.__tree_)
 {
 insert(__m.begin(), __m.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 map& operator=(const map& __m)
 {
#ifndef _LIBCPP_CXX03_LANG
 __tree_ = __m.__tree_;
#else
 if (this != &__m) {
 __tree_.clear();
 __tree_.value_comp() = __m.__tree_.value_comp();
 __tree_.__copy_assign_alloc(__m.__tree_);
 insert(__m.begin(), __m.end());
 }
#endif
 return *this;
 }

#ifndef _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 map(map&& __m)
 _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
 : __tree_(_VSTD::move(__m.__tree_))
 {
 }

 map(map&& __m, const allocator_type& __a);

 _LIBCPP_INLINE_VISIBILITY
 map& operator=(map&& __m)
 _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
 {
 __tree_ = _VSTD::move(__m.__tree_);
 return *this;
 }

 _LIBCPP_INLINE_VISIBILITY
 map(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
 : __tree_(__vc(__comp))
 {
 insert(__il.begin(), __il.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 map(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a))
 {
 insert(__il.begin(), __il.end());
 }

#if _LIBCPP_STD_VER > 11
 _LIBCPP_INLINE_VISIBILITY
 map(initializer_list<value_type> __il, const allocator_type& __a)
 : map(__il, key_compare(), __a) {}
#endif

 _LIBCPP_INLINE_VISIBILITY
 map& operator=(initializer_list<value_type> __il)
 {
 __tree_.__assign_unique(__il.begin(), __il.end());
 return *this;
 }

#endif // _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 explicit map(const allocator_type& __a)
 : __tree_(typename __base::allocator_type(__a))
 {
 }

 _LIBCPP_INLINE_VISIBILITY
 map(const map& __m, const allocator_type& __a)
 : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
 {
 insert(__m.begin(), __m.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 iterator begin() _NOEXCEPT {return __tree_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 iterator end() _NOEXCEPT {return __tree_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const _NOEXCEPT {return __tree_.end();}

 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rbegin() const _NOEXCEPT
 {return const_reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rend() _NOEXCEPT
 {return reverse_iterator(begin());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rend() const _NOEXCEPT
 {return const_reverse_iterator(begin());}

 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT {return begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT {return end();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crend() const _NOEXCEPT {return rend();}

 _LIBCPP_INLINE_VISIBILITY
 bool empty() const _NOEXCEPT {return __tree_.size() == 0;}
 _LIBCPP_INLINE_VISIBILITY
 size_type size() const _NOEXCEPT {return __tree_.size();}
 _LIBCPP_INLINE_VISIBILITY
 size_type max_size() const _NOEXCEPT {return __tree_.max_size();}

 mapped_type& operator[](const key_type& __k);
#ifndef _LIBCPP_CXX03_LANG
 mapped_type& operator[](key_type&& __k);
#endif

 mapped_type& at(const key_type& __k);
 const mapped_type& at(const key_type& __k) const;

 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
 _LIBCPP_INLINE_VISIBILITY
 key_compare key_comp() const {return __tree_.value_comp().key_comp();}
 _LIBCPP_INLINE_VISIBILITY
 value_compare value_comp() const {return value_compare(__tree_.value_comp().key_comp());}

#ifndef _LIBCPP_CXX03_LANG
 template <class ..._Args>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> emplace(_Args&& ...__args) {
 return __tree_.__emplace_unique(_VSTD::forward<_Args>(__args)...);
 }

 template <class ..._Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
 return __tree_.__emplace_hint_unique(__p.__i_, _VSTD::forward<_Args>(__args)...);
 }

 template <class _Pp,
 class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert(_Pp&& __p)
 {return __tree_.__insert_unique(_VSTD::forward<_Pp>(__p));}

 template <class _Pp,
 class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __pos, _Pp&& __p)
 {return __tree_.__insert_unique(__pos.__i_, _VSTD::forward<_Pp>(__p));}

#endif // _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool>
 insert(const value_type& __v) {return __tree_.__insert_unique(__v);}

 _LIBCPP_INLINE_VISIBILITY
 iterator
 insert(const_iterator __p, const value_type& __v)
 {return __tree_.__insert_unique(__p.__i_, __v);}

#ifndef _LIBCPP_CXX03_LANG
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool>
 insert(value_type&& __v) {return __tree_.__insert_unique(_VSTD::move(__v));}

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, value_type&& __v)
 {return __tree_.__insert_unique(__p.__i_, _VSTD::move(__v));}

 _LIBCPP_INLINE_VISIBILITY
 void insert(initializer_list<value_type> __il)
 {insert(__il.begin(), __il.end());}
#endif

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 void insert(_InputIterator __f, _InputIterator __l)
 {
 for (const_iterator __e = cend(); __f != __l; ++__f)
 insert(__e.__i_, *__f);
 }

#if _LIBCPP_STD_VER > 14

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> try_emplace(const key_type& __k, _Args&&... __args)
 {
 return __tree_.__emplace_unique_key_args(__k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(__k),
 _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
 }

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> try_emplace(key_type&& __k, _Args&&... __args)
 {
 return __tree_.__emplace_unique_key_args(__k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(_VSTD::move(__k)),
 _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
 }

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator try_emplace(const_iterator __h, const key_type& __k, _Args&&... __args)
 {
 return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(__k),
 _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
 }

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator try_emplace(const_iterator __h, key_type&& __k, _Args&&... __args)
 {
 return __tree_.__emplace_hint_unique_key_args(__h.__i_, __k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(_VSTD::move(__k)),
 _VSTD::forward_as_tuple(_VSTD::forward<_Args>(__args)...));
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert_or_assign(const key_type& __k, _Vp&& __v)
 {
 iterator __p = lower_bound(__k);
 if ( __p != end() && !key_comp()(__k, __p->first))
 {
 __p->second = _VSTD::forward<_Vp>(__v);
 return _VSTD::make_pair(__p, false);
 }
 return _VSTD::make_pair(emplace_hint(__p, __k, _VSTD::forward<_Vp>(__v)), true);
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert_or_assign(key_type&& __k, _Vp&& __v)
 {
 iterator __p = lower_bound(__k);
 if ( __p != end() && !key_comp()(__k, __p->first))
 {
 __p->second = _VSTD::forward<_Vp>(__v);
 return _VSTD::make_pair(__p, false);
 }
 return _VSTD::make_pair(emplace_hint(__p, _VSTD::move(__k), _VSTD::forward<_Vp>(__v)), true);
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert_or_assign(const_iterator __h, const key_type& __k, _Vp&& __v)
 {
 iterator __p = lower_bound(__k);
 if ( __p != end() && !key_comp()(__k, __p->first))
 {
 __p->second = _VSTD::forward<_Vp>(__v);
 return __p;
 }
 return emplace_hint(__h, __k, _VSTD::forward<_Vp>(__v));
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert_or_assign(const_iterator __h, key_type&& __k, _Vp&& __v)
 {
 iterator __p = lower_bound(__k);
 if ( __p != end() && !key_comp()(__k, __p->first))
 {
 __p->second = _VSTD::forward<_Vp>(__v);
 return __p;
 }
 return emplace_hint(__h, _VSTD::move(__k), _VSTD::forward<_Vp>(__v));
 }

#endif // _LIBCPP_STD_VER > 14

 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(iterator __p) {return __tree_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type erase(const key_type& __k)
 {return __tree_.__erase_unique(__k);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __f, const_iterator __l)
 {return __tree_.erase(__f.__i_, __l.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__tree_.clear();}

 _LIBCPP_INLINE_VISIBILITY
 void swap(map& __m)
 _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
 {__tree_.swap(__m.__tree_);}

 _LIBCPP_INLINE_VISIBILITY
 iterator find(const key_type& __k) {return __tree_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 find(const _K2& __k) {return __tree_.find(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 find(const _K2& __k) const {return __tree_.find(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 size_type count(const key_type& __k) const
 {return __tree_.__count_unique(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
 count(const _K2& __k) const {return __tree_.__count_unique(__k);}
#endif
 _LIBCPP_INLINE_VISIBILITY
 iterator lower_bound(const key_type& __k)
 {return __tree_.lower_bound(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator lower_bound(const key_type& __k) const
 {return __tree_.lower_bound(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 lower_bound(const _K2& __k) {return __tree_.lower_bound(__k);}

 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 iterator upper_bound(const key_type& __k)
 {return __tree_.upper_bound(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator upper_bound(const key_type& __k) const
 {return __tree_.upper_bound(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 upper_bound(const _K2& __k) {return __tree_.upper_bound(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 pair<iterator,iterator> equal_range(const key_type& __k)
 {return __tree_.__equal_range_unique(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
 {return __tree_.__equal_range_unique(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
 equal_range(const _K2& __k) {return __tree_.__equal_range_unique(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
 equal_range(const _K2& __k) const {return __tree_.__equal_range_unique(__k);}
#endif

private:
 typedef typename __base::__node __node;
 typedef typename __base::__node_allocator __node_allocator;
 typedef typename __base::__node_pointer __node_pointer;
 typedef typename __base::__node_base_pointer __node_base_pointer;
 typedef typename __base::__parent_pointer __parent_pointer;

 typedef __map_node_destructor<__node_allocator> _Dp;
 typedef unique_ptr<__node, _Dp> __node_holder;

#ifdef _LIBCPP_CXX03_LANG
 __node_holder __construct_node_with_key(const key_type& __k);
#endif
};


#ifndef _LIBCPP_CXX03_LANG
template <class _Key, class _Tp, class _Compare, class _Allocator>
map<_Key, _Tp, _Compare, _Allocator>::map(map&& __m, const allocator_type& __a)
 : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
{
 if (__a != __m.get_allocator())
 {
 const_iterator __e = cend();
 while (!__m.empty())
 __tree_.__insert_unique(__e.__i_,
 _VSTD::move(__m.__tree_.remove(__m.begin().__i_)->__value_.__nc));
 }
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
_Tp&
map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
{
 return __tree_.__emplace_unique_key_args(__k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(__k),
 _VSTD::forward_as_tuple()).first->__cc.second;
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
_Tp&
map<_Key, _Tp, _Compare, _Allocator>::operator[](key_type&& __k)
{
 return __tree_.__emplace_unique_key_args(__k,
 _VSTD::piecewise_construct,
 _VSTD::forward_as_tuple(_VSTD::move(__k)),
 _VSTD::forward_as_tuple()).first->__cc.second;
}

#else // _LIBCPP_CXX03_LANG

template <class _Key, class _Tp, class _Compare, class _Allocator>
typename map<_Key, _Tp, _Compare, _Allocator>::__node_holder
map<_Key, _Tp, _Compare, _Allocator>::__construct_node_with_key(const key_type& __k)
{
 __node_allocator& __na = __tree_.__node_alloc();
 __node_holder __h(__node_traits::allocate(__na, 1), _Dp(__na));
 __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__cc.first), __k);
 __h.get_deleter().__first_constructed = true;
 __node_traits::construct(__na, _VSTD::addressof(__h->__value_.__cc.second));
 __h.get_deleter().__second_constructed = true;
 return _LIBCPP_EXPLICIT_MOVE(__h); // explicitly moved for C++03
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
_Tp&
map<_Key, _Tp, _Compare, _Allocator>::operator[](const key_type& __k)
{
 __parent_pointer __parent;
 __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
 __node_pointer __r = static_cast<__node_pointer>(__child);
 if (__child == nullptr)
 {
 __node_holder __h = __construct_node_with_key(__k);
 __tree_.__insert_node_at(__parent, __child, static_cast<__node_base_pointer>(__h.get()));
 __r = __h.release();
 }
 return __r->__value_.__cc.second;
}

#endif // _LIBCPP_CXX03_LANG

template <class _Key, class _Tp, class _Compare, class _Allocator>
_Tp&
map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k)
{
 __parent_pointer __parent;
 __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__child == nullptr)
 throw out_of_range("map::at: key not found");
#endif // _LIBCPP_NO_EXCEPTIONS
 return static_cast<__node_pointer>(__child)->__value_.__cc.second;
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
const _Tp&
map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k) const
{
 __parent_pointer __parent;
 __node_base_pointer __child = __tree_.__find_equal(__parent, __k);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__child == nullptr)
 throw out_of_range("map::at: key not found");
#endif // _LIBCPP_NO_EXCEPTIONS
 return static_cast<__node_pointer>(__child)->__value_.__cc.second;
}


template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator< (const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__x == __y);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator> (const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return __y < __x;
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__x < __y);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const map<_Key, _Tp, _Compare, _Allocator>& __x,
 const map<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__y < __x);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(map<_Key, _Tp, _Compare, _Allocator>& __x,
 map<_Key, _Tp, _Compare, _Allocator>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Key, class _Tp, class _Compare = less<_Key>,
 class _Allocator = allocator<pair<const _Key, _Tp> > >
class _LIBCPP_TEMPLATE_VIS multimap
{
public:
 // types:
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef pair<key_type, mapped_type> __nc_value_type;
 typedef _Compare key_compare;
 typedef _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");

 class _LIBCPP_TEMPLATE_VIS value_compare
 : public binary_function<value_type, value_type, bool>
 {
 friend class multimap;
 protected:
 key_compare comp;

 _LIBCPP_INLINE_VISIBILITY
 value_compare(key_compare c) : comp(c) {}
 public:
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const value_type& __x, const value_type& __y) const
 {return comp(__x.first, __y.first);}
 };

private:

 typedef _VSTD::__value_type<key_type, mapped_type> __value_type;
 typedef __map_value_compare<key_type, __value_type, key_compare> __vc;
 typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
 __value_type>::type __allocator_type;
 typedef __tree<__value_type, __vc, __allocator_type> __base;
 typedef typename __base::__node_traits __node_traits;
 typedef allocator_traits<allocator_type> __alloc_traits;

 __base __tree_;

public:
 typedef typename __alloc_traits::pointer pointer;
 typedef typename __alloc_traits::const_pointer const_pointer;
 typedef typename __alloc_traits::size_type size_type;
 typedef typename __alloc_traits::difference_type difference_type;
 typedef __map_iterator<typename __base::iterator> iterator;
 typedef __map_const_iterator<typename __base::const_iterator> const_iterator;
 typedef _VSTD::reverse_iterator<iterator> reverse_iterator;
 typedef _VSTD::reverse_iterator<const_iterator> const_reverse_iterator;

 _LIBCPP_INLINE_VISIBILITY
 multimap()
 _NOEXCEPT_(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_default_constructible<key_compare>::value &&
 is_nothrow_copy_constructible<key_compare>::value)
 : __tree_(__vc(key_compare())) {}

 _LIBCPP_INLINE_VISIBILITY
 explicit multimap(const key_compare& __comp)
 _NOEXCEPT_(
 is_nothrow_default_constructible<allocator_type>::value &&
 is_nothrow_copy_constructible<key_compare>::value)
 : __tree_(__vc(__comp)) {}

 _LIBCPP_INLINE_VISIBILITY
 explicit multimap(const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a)) {}

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 multimap(_InputIterator __f, _InputIterator __l,
 const key_compare& __comp = key_compare())
 : __tree_(__vc(__comp))
 {
 insert(__f, __l);
 }

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 multimap(_InputIterator __f, _InputIterator __l,
 const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a))
 {
 insert(__f, __l);
 }

#if _LIBCPP_STD_VER > 11
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 multimap(_InputIterator __f, _InputIterator __l, const allocator_type& __a)
 : multimap(__f, __l, key_compare(), __a) {}
#endif

 _LIBCPP_INLINE_VISIBILITY
 multimap(const multimap& __m)
 : __tree_(__m.__tree_.value_comp(),
 __alloc_traits::select_on_container_copy_construction(__m.__tree_.__alloc()))
 {
 insert(__m.begin(), __m.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 multimap& operator=(const multimap& __m)
 {
#ifndef _LIBCPP_CXX03_LANG
 __tree_ = __m.__tree_;
#else
 if (this != &__m) {
 __tree_.clear();
 __tree_.value_comp() = __m.__tree_.value_comp();
 __tree_.__copy_assign_alloc(__m.__tree_);
 insert(__m.begin(), __m.end());
 }
#endif
 return *this;
 }

#ifndef _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 multimap(multimap&& __m)
 _NOEXCEPT_(is_nothrow_move_constructible<__base>::value)
 : __tree_(_VSTD::move(__m.__tree_))
 {
 }

 multimap(multimap&& __m, const allocator_type& __a);

 _LIBCPP_INLINE_VISIBILITY
 multimap& operator=(multimap&& __m)
 _NOEXCEPT_(is_nothrow_move_assignable<__base>::value)
 {
 __tree_ = _VSTD::move(__m.__tree_);
 return *this;
 }

 _LIBCPP_INLINE_VISIBILITY
 multimap(initializer_list<value_type> __il, const key_compare& __comp = key_compare())
 : __tree_(__vc(__comp))
 {
 insert(__il.begin(), __il.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 multimap(initializer_list<value_type> __il, const key_compare& __comp, const allocator_type& __a)
 : __tree_(__vc(__comp), typename __base::allocator_type(__a))
 {
 insert(__il.begin(), __il.end());
 }

#if _LIBCPP_STD_VER > 11
 _LIBCPP_INLINE_VISIBILITY
 multimap(initializer_list<value_type> __il, const allocator_type& __a)
 : multimap(__il, key_compare(), __a) {}
#endif

 _LIBCPP_INLINE_VISIBILITY
 multimap& operator=(initializer_list<value_type> __il)
 {
 __tree_.__assign_multi(__il.begin(), __il.end());
 return *this;
 }

#endif // _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 explicit multimap(const allocator_type& __a)
 : __tree_(typename __base::allocator_type(__a))
 {
 }

 _LIBCPP_INLINE_VISIBILITY
 multimap(const multimap& __m, const allocator_type& __a)
 : __tree_(__m.__tree_.value_comp(), typename __base::allocator_type(__a))
 {
 insert(__m.begin(), __m.end());
 }

 _LIBCPP_INLINE_VISIBILITY
 iterator begin() _NOEXCEPT {return __tree_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const _NOEXCEPT {return __tree_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 iterator end() _NOEXCEPT {return __tree_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const _NOEXCEPT {return __tree_.end();}

 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rbegin() _NOEXCEPT {return reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rbegin() const _NOEXCEPT
 {return const_reverse_iterator(end());}
 _LIBCPP_INLINE_VISIBILITY
 reverse_iterator rend() _NOEXCEPT {return reverse_iterator(begin());}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator rend() const _NOEXCEPT
 {return const_reverse_iterator(begin());}

 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT {return begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT {return end();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crbegin() const _NOEXCEPT {return rbegin();}
 _LIBCPP_INLINE_VISIBILITY
 const_reverse_iterator crend() const _NOEXCEPT {return rend();}

 _LIBCPP_INLINE_VISIBILITY
 bool empty() const _NOEXCEPT {return __tree_.size() == 0;}
 _LIBCPP_INLINE_VISIBILITY
 size_type size() const _NOEXCEPT {return __tree_.size();}
 _LIBCPP_INLINE_VISIBILITY
 size_type max_size() const _NOEXCEPT {return __tree_.max_size();}

 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const _NOEXCEPT {return allocator_type(__tree_.__alloc());}
 _LIBCPP_INLINE_VISIBILITY
 key_compare key_comp() const {return __tree_.value_comp().key_comp();}
 _LIBCPP_INLINE_VISIBILITY
 value_compare value_comp() const
 {return value_compare(__tree_.value_comp().key_comp());}

#ifndef _LIBCPP_CXX03_LANG

 template <class ..._Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace(_Args&& ...__args) {
 return __tree_.__emplace_multi(_VSTD::forward<_Args>(__args)...);
 }

 template <class ..._Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace_hint(const_iterator __p, _Args&& ...__args) {
 return __tree_.__emplace_hint_multi(__p.__i_, _VSTD::forward<_Args>(__args)...);
 }

 template <class _Pp,
 class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(_Pp&& __p)
 {return __tree_.__insert_multi(_VSTD::forward<_Pp>(__p));}

 template <class _Pp,
 class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __pos, _Pp&& __p)
 {return __tree_.__insert_multi(__pos.__i_, _VSTD::forward<_Pp>(__p));}

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(value_type&& __v)
 {return __tree_.__insert_multi(_VSTD::move(__v));}

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, value_type&& __v)
 {return __tree_.__insert_multi(__p.__i_, _VSTD::move(__v));}


 _LIBCPP_INLINE_VISIBILITY
 void insert(initializer_list<value_type> __il)
 {insert(__il.begin(), __il.end());}

#endif // _LIBCPP_CXX03_LANG

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const value_type& __v) {return __tree_.__insert_multi(__v);}

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, const value_type& __v)
 {return __tree_.__insert_multi(__p.__i_, __v);}

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 void insert(_InputIterator __f, _InputIterator __l)
 {
 for (const_iterator __e = cend(); __f != __l; ++__f)
 __tree_.__insert_multi(__e.__i_, *__f);
 }

 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __tree_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(iterator __p) {return __tree_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type erase(const key_type& __k) {return __tree_.__erase_multi(__k);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __f, const_iterator __l)
 {return __tree_.erase(__f.__i_, __l.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() {__tree_.clear();}

 _LIBCPP_INLINE_VISIBILITY
 void swap(multimap& __m)
 _NOEXCEPT_(__is_nothrow_swappable<__base>::value)
 {__tree_.swap(__m.__tree_);}

 _LIBCPP_INLINE_VISIBILITY
 iterator find(const key_type& __k) {return __tree_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator find(const key_type& __k) const {return __tree_.find(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 find(const _K2& __k) {return __tree_.find(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 find(const _K2& __k) const {return __tree_.find(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 size_type count(const key_type& __k) const
 {return __tree_.__count_multi(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,size_type>::type
 count(const _K2& __k) const {return __tree_.__count_multi(__k);}
#endif
 _LIBCPP_INLINE_VISIBILITY
 iterator lower_bound(const key_type& __k)
 {return __tree_.lower_bound(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator lower_bound(const key_type& __k) const
 {return __tree_.lower_bound(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 lower_bound(const _K2& __k) {return __tree_.lower_bound(__k);}

 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 lower_bound(const _K2& __k) const {return __tree_.lower_bound(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 iterator upper_bound(const key_type& __k)
 {return __tree_.upper_bound(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator upper_bound(const key_type& __k) const
 {return __tree_.upper_bound(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,iterator>::type
 upper_bound(const _K2& __k) {return __tree_.upper_bound(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,const_iterator>::type
 upper_bound(const _K2& __k) const {return __tree_.upper_bound(__k);}
#endif

 _LIBCPP_INLINE_VISIBILITY
 pair<iterator,iterator> equal_range(const key_type& __k)
 {return __tree_.__equal_range_multi(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<const_iterator,const_iterator> equal_range(const key_type& __k) const
 {return __tree_.__equal_range_multi(__k);}
#if _LIBCPP_STD_VER > 11
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,pair<iterator,iterator>>::type
 equal_range(const _K2& __k) {return __tree_.__equal_range_multi(__k);}
 template <typename _K2>
 _LIBCPP_INLINE_VISIBILITY
 typename enable_if<__is_transparent<_Compare, _K2>::value,pair<const_iterator,const_iterator>>::type
 equal_range(const _K2& __k) const {return __tree_.__equal_range_multi(__k);}
#endif

private:
 typedef typename __base::__node __node;
 typedef typename __base::__node_allocator __node_allocator;
 typedef typename __base::__node_pointer __node_pointer;

 typedef __map_node_destructor<__node_allocator> _Dp;
 typedef unique_ptr<__node, _Dp> __node_holder;
};

#ifndef _LIBCPP_CXX03_LANG
template <class _Key, class _Tp, class _Compare, class _Allocator>
multimap<_Key, _Tp, _Compare, _Allocator>::multimap(multimap&& __m, const allocator_type& __a)
 : __tree_(_VSTD::move(__m.__tree_), typename __base::allocator_type(__a))
{
 if (__a != __m.get_allocator())
 {
 const_iterator __e = cend();
 while (!__m.empty())
 __tree_.__insert_multi(__e.__i_,
 _VSTD::move(__m.__tree_.remove(__m.begin().__i_)->__value_.__nc));
 }
}
#endif

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator==(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return __x.size() == __y.size() && _VSTD::equal(__x.begin(), __x.end(), __y.begin());
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator< (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return _VSTD::lexicographical_compare(__x.begin(), __x.end(), __y.begin(), __y.end());
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__x == __y);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator> (const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return __y < __x;
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__x < __y);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 const multimap<_Key, _Tp, _Compare, _Allocator>& __y)
{
 return !(__y < __x);
}

template <class _Key, class _Tp, class _Compare, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(multimap<_Key, _Tp, _Compare, _Allocator>& __x,
 multimap<_Key, _Tp, _Compare, _Allocator>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_MAP