include/unordered_map

// -*- C++ -*-
//===-------------------------- unordered_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_UNORDERED_MAP
#define _LIBCPP_UNORDERED_MAP

/*

 unordered_map synopsis

#include <initializer_list>

namespace std
{

template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
 class Alloc = allocator<pair<const Key, T>>>
class unordered_map
{
public:
 // types
 typedef Key key_type;
 typedef T mapped_type;
 typedef Hash hasher;
 typedef Pred key_equal;
 typedef Alloc allocator_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef value_type& reference;
 typedef const value_type& const_reference;
 typedef typename allocator_traits<allocator_type>::pointer pointer;
 typedef typename allocator_traits<allocator_type>::const_pointer const_pointer;
 typedef typename allocator_traits<allocator_type>::size_type size_type;
 typedef typename allocator_traits<allocator_type>::difference_type difference_type;

 typedef /unspecified/ iterator;
 typedef /unspecified/ const_iterator;
 typedef /unspecified/ local_iterator;
 typedef /unspecified/ const_local_iterator;

 unordered_map()
 noexcept(
 is_nothrow_default_constructible<hasher>::value &&
 is_nothrow_default_constructible<key_equal>::value &&
 is_nothrow_default_constructible<allocator_type>::value);
 explicit unordered_map(size_type n, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 template <class InputIterator>
 unordered_map(InputIterator f, InputIterator l,
 size_type n = 0, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 explicit unordered_map(const allocator_type&);
 unordered_map(const unordered_map&);
 unordered_map(const unordered_map&, const Allocator&);
 unordered_map(unordered_map&&)
 noexcept(
 is_nothrow_move_constructible<hasher>::value &&
 is_nothrow_move_constructible<key_equal>::value &&
 is_nothrow_move_constructible<allocator_type>::value);
 unordered_map(unordered_map&&, const Allocator&);
 unordered_map(initializer_list<value_type>, size_type n = 0,
 const hasher& hf = hasher(), const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 unordered_map(size_type n, const allocator_type& a)
 : unordered_map(n, hasher(), key_equal(), a) {} // C++14
 unordered_map(size_type n, const hasher& hf, const allocator_type& a)
 : unordered_map(n, hf, key_equal(), a) {} // C++14
 template <class InputIterator>
 unordered_map(InputIterator f, InputIterator l, size_type n, const allocator_type& a)
 : unordered_map(f, l, n, hasher(), key_equal(), a) {} // C++14
 template <class InputIterator>
 unordered_map(InputIterator f, InputIterator l, size_type n, const hasher& hf, 
 const allocator_type& a)
 : unordered_map(f, l, n, hf, key_equal(), a) {} // C++14
 unordered_map(initializer_list<value_type> il, size_type n, const allocator_type& a)
 : unordered_map(il, n, hasher(), key_equal(), a) {} // C++14
 unordered_map(initializer_list<value_type> il, size_type n, const hasher& hf, 
 const allocator_type& a)
 : unordered_map(il, n, hf, key_equal(), a) {} // C++14
 ~unordered_map();
 unordered_map& operator=(const unordered_map&);
 unordered_map& operator=(unordered_map&&)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value &&
 is_nothrow_move_assignable<hasher>::value &&
 is_nothrow_move_assignable<key_equal>::value);
 unordered_map& operator=(initializer_list<value_type>);

 allocator_type get_allocator() const noexcept;

 bool empty() const noexcept;
 size_type size() const noexcept;
 size_type max_size() const noexcept;

 iterator begin() noexcept;
 iterator end() noexcept;
 const_iterator begin() const noexcept;
 const_iterator end() const noexcept;
 const_iterator cbegin() const noexcept;
 const_iterator cend() const noexcept;

 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& obj);
 template <class P>
 pair<iterator, bool> insert(P&& obj);
 iterator insert(const_iterator hint, const value_type& obj);
 template <class P>
 iterator insert(const_iterator hint, P&& obj);
 template <class InputIterator>
 void insert(InputIterator first, InputIterator last);
 void insert(initializer_list<value_type>);

 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(unordered_map&)
 noexcept(
 (!allocator_type::propagate_on_container_swap::value ||
 __is_nothrow_swappable<allocator_type>::value) &&
 __is_nothrow_swappable<hasher>::value &&
 __is_nothrow_swappable<key_equal>::value);

 hasher hash_function() const;
 key_equal key_eq() const;

 iterator find(const key_type& k);
 const_iterator find(const key_type& k) const;
 size_type count(const key_type& k) const;
 pair<iterator, iterator> equal_range(const key_type& k);
 pair<const_iterator, const_iterator> equal_range(const key_type& k) const;

 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;

 size_type bucket_count() const noexcept;
 size_type max_bucket_count() const noexcept;

 size_type bucket_size(size_type n) const;
 size_type bucket(const key_type& k) const;

 local_iterator begin(size_type n);
 local_iterator end(size_type n);
 const_local_iterator begin(size_type n) const;
 const_local_iterator end(size_type n) const;
 const_local_iterator cbegin(size_type n) const;
 const_local_iterator cend(size_type n) const;

 float load_factor() const noexcept;
 float max_load_factor() const noexcept;
 void max_load_factor(float z);
 void rehash(size_type n);
 void reserve(size_type n);
};

template <class Key, class T, class Hash, class Pred, class Alloc>
 void swap(unordered_map<Key, T, Hash, Pred, Alloc>& x,
 unordered_map<Key, T, Hash, Pred, Alloc>& y)
 noexcept(noexcept(x.swap(y)));

template <class Key, class T, class Hash, class Pred, class Alloc>
 bool
 operator==(const unordered_map<Key, T, Hash, Pred, Alloc>& x,
 const unordered_map<Key, T, Hash, Pred, Alloc>& y);

template <class Key, class T, class Hash, class Pred, class Alloc>
 bool
 operator!=(const unordered_map<Key, T, Hash, Pred, Alloc>& x,
 const unordered_map<Key, T, Hash, Pred, Alloc>& y);

template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
 class Alloc = allocator<pair<const Key, T>>>
class unordered_multimap
{
public:
 // types
 typedef Key key_type;
 typedef T mapped_type;
 typedef Hash hasher;
 typedef Pred key_equal;
 typedef Alloc allocator_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef value_type& reference;
 typedef const value_type& const_reference;
 typedef typename allocator_traits<allocator_type>::pointer pointer;
 typedef typename allocator_traits<allocator_type>::const_pointer const_pointer;
 typedef typename allocator_traits<allocator_type>::size_type size_type;
 typedef typename allocator_traits<allocator_type>::difference_type difference_type;

 typedef /unspecified/ iterator;
 typedef /unspecified/ const_iterator;
 typedef /unspecified/ local_iterator;
 typedef /unspecified/ const_local_iterator;

 unordered_multimap()
 noexcept(
 is_nothrow_default_constructible<hasher>::value &&
 is_nothrow_default_constructible<key_equal>::value &&
 is_nothrow_default_constructible<allocator_type>::value);
 explicit unordered_multimap(size_type n, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 template <class InputIterator>
 unordered_multimap(InputIterator f, InputIterator l,
 size_type n = 0, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 explicit unordered_multimap(const allocator_type&);
 unordered_multimap(const unordered_multimap&);
 unordered_multimap(const unordered_multimap&, const Allocator&);
 unordered_multimap(unordered_multimap&&)
 noexcept(
 is_nothrow_move_constructible<hasher>::value &&
 is_nothrow_move_constructible<key_equal>::value &&
 is_nothrow_move_constructible<allocator_type>::value);
 unordered_multimap(unordered_multimap&&, const Allocator&);
 unordered_multimap(initializer_list<value_type>, size_type n = 0,
 const hasher& hf = hasher(), const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 unordered_multimap(size_type n, const allocator_type& a)
 : unordered_multimap(n, hasher(), key_equal(), a) {} // C++14
 unordered_multimap(size_type n, const hasher& hf, const allocator_type& a)
 : unordered_multimap(n, hf, key_equal(), a) {} // C++14
 template <class InputIterator>
 unordered_multimap(InputIterator f, InputIterator l, size_type n, const allocator_type& a)
 : unordered_multimap(f, l, n, hasher(), key_equal(), a) {} // C++14
 template <class InputIterator>
 unordered_multimap(InputIterator f, InputIterator l, size_type n, const hasher& hf, 
 const allocator_type& a)
 : unordered_multimap(f, l, n, hf, key_equal(), a) {} // C++14
 unordered_multimap(initializer_list<value_type> il, size_type n, const allocator_type& a)
 : unordered_multimap(il, n, hasher(), key_equal(), a) {} // C++14
 unordered_multimap(initializer_list<value_type> il, size_type n, const hasher& hf, 
 const allocator_type& a)
 : unordered_multimap(il, n, hf, key_equal(), a) {} // C++14
 ~unordered_multimap();
 unordered_multimap& operator=(const unordered_multimap&);
 unordered_multimap& operator=(unordered_multimap&&)
 noexcept(
 allocator_type::propagate_on_container_move_assignment::value &&
 is_nothrow_move_assignable<allocator_type>::value &&
 is_nothrow_move_assignable<hasher>::value &&
 is_nothrow_move_assignable<key_equal>::value);
 unordered_multimap& operator=(initializer_list<value_type>);

 allocator_type get_allocator() const noexcept;

 bool empty() const noexcept;
 size_type size() const noexcept;
 size_type max_size() const noexcept;

 iterator begin() noexcept;
 iterator end() noexcept;
 const_iterator begin() const noexcept;
 const_iterator end() const noexcept;
 const_iterator cbegin() const noexcept;
 const_iterator cend() const noexcept;

 template <class... Args>
 iterator emplace(Args&&... args);
 template <class... Args>
 iterator emplace_hint(const_iterator position, Args&&... args);
 iterator insert(const value_type& obj);
 template <class P>
 iterator insert(P&& obj);
 iterator insert(const_iterator hint, const value_type& obj);
 template <class P>
 iterator insert(const_iterator hint, P&& obj);
 template <class InputIterator>
 void insert(InputIterator first, InputIterator last);
 void insert(initializer_list<value_type>);

 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(unordered_multimap&)
 noexcept(
 (!allocator_type::propagate_on_container_swap::value ||
 __is_nothrow_swappable<allocator_type>::value) &&
 __is_nothrow_swappable<hasher>::value &&
 __is_nothrow_swappable<key_equal>::value);

 hasher hash_function() const;
 key_equal key_eq() const;

 iterator find(const key_type& k);
 const_iterator find(const key_type& k) const;
 size_type count(const key_type& k) const;
 pair<iterator, iterator> equal_range(const key_type& k);
 pair<const_iterator, const_iterator> equal_range(const key_type& k) const;

 size_type bucket_count() const noexcept;
 size_type max_bucket_count() const noexcept;

 size_type bucket_size(size_type n) const;
 size_type bucket(const key_type& k) const;

 local_iterator begin(size_type n);
 local_iterator end(size_type n);
 const_local_iterator begin(size_type n) const;
 const_local_iterator end(size_type n) const;
 const_local_iterator cbegin(size_type n) const;
 const_local_iterator cend(size_type n) const;

 float load_factor() const noexcept;
 float max_load_factor() const noexcept;
 void max_load_factor(float z);
 void rehash(size_type n);
 void reserve(size_type n);
};

template <class Key, class T, class Hash, class Pred, class Alloc>
 void swap(unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
 unordered_multimap<Key, T, Hash, Pred, Alloc>& y)
 noexcept(noexcept(x.swap(y)));

template <class Key, class T, class Hash, class Pred, class Alloc>
 bool
 operator==(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
 const unordered_multimap<Key, T, Hash, Pred, Alloc>& y);

template <class Key, class T, class Hash, class Pred, class Alloc>
 bool
 operator!=(const unordered_multimap<Key, T, Hash, Pred, Alloc>& x,
 const unordered_multimap<Key, T, Hash, Pred, Alloc>& y);

} // std

*/

#include <__config>
#include <__hash_table>
#include <functional>
#include <stdexcept>
#include <tuple>

#include <__debug>

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

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Key, class _Cp, class _Hash,
 bool = is_empty<_Hash>::value && !__libcpp_is_final<_Hash>::value
 >
class __unordered_map_hasher
 : private _Hash
{
public:
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_hasher()
 _NOEXCEPT_(is_nothrow_default_constructible<_Hash>::value)
 : _Hash() {}
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_hasher(const _Hash& __h)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Hash>::value)
 : _Hash(__h) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Hash& hash_function() const _NOEXCEPT {return *this;}
 _LIBCPP_INLINE_VISIBILITY
 size_t operator()(const _Cp& __x) const
 {return static_cast<const _Hash&>(*this)(__x.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 size_t operator()(const _Key& __x) const
 {return static_cast<const _Hash&>(*this)(__x);}
 void swap(__unordered_map_hasher&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Hash>::value)
 {
 using _VSTD::swap;
 swap(static_cast<const _Hash&>(*this), static_cast<const _Hash&>(__y));
 }
};

template <class _Key, class _Cp, class _Hash>
class __unordered_map_hasher<_Key, _Cp, _Hash, false>
{
 _Hash __hash_;
public:
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_hasher()
 _NOEXCEPT_(is_nothrow_default_constructible<_Hash>::value)
 : __hash_() {}
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_hasher(const _Hash& __h)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Hash>::value)
 : __hash_(__h) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Hash& hash_function() const _NOEXCEPT {return __hash_;}
 _LIBCPP_INLINE_VISIBILITY
 size_t operator()(const _Cp& __x) const
 {return __hash_(__x.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 size_t operator()(const _Key& __x) const
 {return __hash_(__x);}
 void swap(__unordered_map_hasher&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Hash>::value)
 {
 using _VSTD::swap;
 swap(__hash_, __y.__hash_);
 }
};

template <class _Key, class _Cp, class _Hash, bool __b>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(__unordered_map_hasher<_Key, _Cp, _Hash, __b>& __x,
 __unordered_map_hasher<_Key, _Cp, _Hash, __b>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Key, class _Cp, class _Pred,
 bool = is_empty<_Pred>::value && !__libcpp_is_final<_Pred>::value
 >
class __unordered_map_equal
 : private _Pred
{
public:
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_equal()
 _NOEXCEPT_(is_nothrow_default_constructible<_Pred>::value)
 : _Pred() {}
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_equal(const _Pred& __p)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Pred>::value)
 : _Pred(__p) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Pred& key_eq() const _NOEXCEPT {return *this;}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Cp& __x, const _Cp& __y) const
 {return static_cast<const _Pred&>(*this)(__x.__cc.first, __y.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Cp& __x, const _Key& __y) const
 {return static_cast<const _Pred&>(*this)(__x.__cc.first, __y);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Key& __x, const _Cp& __y) const
 {return static_cast<const _Pred&>(*this)(__x, __y.__cc.first);}
 void swap(__unordered_map_equal&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Pred>::value)
 {
 using _VSTD::swap;
 swap(static_cast<const _Pred&>(*this), static_cast<const _Pred&>(__y));
 }
};

template <class _Key, class _Cp, class _Pred>
class __unordered_map_equal<_Key, _Cp, _Pred, false>
{
 _Pred __pred_;
public:
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_equal()
 _NOEXCEPT_(is_nothrow_default_constructible<_Pred>::value)
 : __pred_() {}
 _LIBCPP_INLINE_VISIBILITY
 __unordered_map_equal(const _Pred& __p)
 _NOEXCEPT_(is_nothrow_copy_constructible<_Pred>::value)
 : __pred_(__p) {}
 _LIBCPP_INLINE_VISIBILITY
 const _Pred& key_eq() const _NOEXCEPT {return __pred_;}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Cp& __x, const _Cp& __y) const
 {return __pred_(__x.__cc.first, __y.__cc.first);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Cp& __x, const _Key& __y) const
 {return __pred_(__x.__cc.first, __y);}
 _LIBCPP_INLINE_VISIBILITY
 bool operator()(const _Key& __x, const _Cp& __y) const
 {return __pred_(__x, __y.__cc.first);}
 void swap(__unordered_map_equal&__y)
 _NOEXCEPT_(__is_nothrow_swappable<_Pred>::value)
 {
 using _VSTD::swap;
 swap(__pred_, __y.__pred_);
 }
};

template <class _Key, class _Cp, class _Pred, bool __b>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(__unordered_map_equal<_Key, _Cp, _Pred, __b>& __x,
 __unordered_map_equal<_Key, _Cp, _Pred, __b>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Alloc>
class __hash_map_node_destructor
{
 typedef _Alloc allocator_type;
 typedef allocator_traits<allocator_type> __alloc_traits;

public:

 typedef typename __alloc_traits::pointer pointer;
private:

 allocator_type& __na_;

 __hash_map_node_destructor& operator=(const __hash_map_node_destructor&);

public:
 bool __first_constructed;
 bool __second_constructed;

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

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 __hash_map_node_destructor(__hash_node_destructor<allocator_type>&& __x)
 _NOEXCEPT
 : __na_(__x.__na_),
 __first_constructed(__x.__value_constructed),
 __second_constructed(__x.__value_constructed)
 {
 __x.__value_constructed = false;
 }
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 __hash_map_node_destructor(const __hash_node_destructor<allocator_type>& __x)
 : __na_(__x.__na_),
 __first_constructed(__x.__value_constructed),
 __second_constructed(__x.__value_constructed)
 {
 const_cast<bool&>(__x.__value_constructed) = false;
 }
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 _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);
 }
};

#ifndef _LIBCPP_CXX03_LANG
template <class _Key, class _Tp>
union __hash_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
 __hash_value_type& operator=(const __hash_value_type& __v)
 {__nc = __v.__cc; return *this;}

 _LIBCPP_INLINE_VISIBILITY
 __hash_value_type& operator=(__hash_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
 __hash_value_type& operator=(_ValueTp&& __v) {
 __nc = _VSTD::forward<_ValueTp>(__v); return *this;
 }

private:
 __hash_value_type(const __hash_value_type& __v) = delete;
 __hash_value_type(__hash_value_type&& __v) = delete;
 template <class ..._Args>
 explicit __hash_value_type(_Args&& ...__args) = delete;

 ~__hash_value_type() = delete;
};

#else

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

 value_type __cc;

private:
 ~__hash_value_type();
};

#endif

template <class _HashIterator>
class _LIBCPP_TYPE_VIS_ONLY __hash_map_iterator
{
 _HashIterator __i_;

 typedef __hash_node_types_from_iterator<_HashIterator> _NodeTypes;

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

 _LIBCPP_INLINE_VISIBILITY
 __hash_map_iterator() _NOEXCEPT {}

 _LIBCPP_INLINE_VISIBILITY
 __hash_map_iterator(_HashIterator __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
 __hash_map_iterator& operator++() {++__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __hash_map_iterator operator++(int)
 {
 __hash_map_iterator __t(*this);
 ++(*this);
 return __t;
 }

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

 template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY unordered_map;
 template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY unordered_multimap;
 template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_iterator;
 template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_local_iterator;
 template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_map_const_iterator;
};

template <class _HashIterator>
class _LIBCPP_TYPE_VIS_ONLY __hash_map_const_iterator
{
 _HashIterator __i_;

 typedef __hash_node_types_from_iterator<_HashIterator> _NodeTypes;

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

 _LIBCPP_INLINE_VISIBILITY
 __hash_map_const_iterator() _NOEXCEPT {}

 _LIBCPP_INLINE_VISIBILITY
 __hash_map_const_iterator(_HashIterator __i) _NOEXCEPT : __i_(__i) {}
 _LIBCPP_INLINE_VISIBILITY
 __hash_map_const_iterator(
 __hash_map_iterator<typename _HashIterator::__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
 __hash_map_const_iterator& operator++() {++__i_; return *this;}
 _LIBCPP_INLINE_VISIBILITY
 __hash_map_const_iterator operator++(int)
 {
 __hash_map_const_iterator __t(*this);
 ++(*this);
 return __t;
 }

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

 template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY unordered_map;
 template <class, class, class, class, class> friend class _LIBCPP_TYPE_VIS_ONLY unordered_multimap;
 template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_iterator;
 template <class> friend class _LIBCPP_TYPE_VIS_ONLY __hash_const_local_iterator;
};

template <class _Key, class _Tp, class _Hash = hash<_Key>, class _Pred = equal_to<_Key>,
 class _Alloc = allocator<pair<const _Key, _Tp> > >
class _LIBCPP_TYPE_VIS_ONLY unordered_map
{
public:
 // types
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef _Hash hasher;
 typedef _Pred key_equal;
 typedef _Alloc allocator_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef pair<key_type, mapped_type> __nc_value_type;
 typedef value_type& reference;
 typedef const value_type& const_reference;
 static_assert((is_same<value_type, typename allocator_type::value_type>::value),
 "Invalid allocator::value_type");

private:
 typedef __hash_value_type<key_type, mapped_type> __value_type;
 typedef __unordered_map_hasher<key_type, __value_type, hasher> __hasher;
 typedef __unordered_map_equal<key_type, __value_type, key_equal> __key_equal;
 typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
 __value_type>::type __allocator_type;

 typedef __hash_table<__value_type, __hasher,
 __key_equal, __allocator_type> __table;

 __table __table_;

 typedef typename __table::_NodeTypes _NodeTypes;
 typedef typename __table::__node_pointer __node_pointer;
 typedef typename __table::__node_const_pointer __node_const_pointer;
 typedef typename __table::__node_traits __node_traits;
 typedef typename __table::__node_allocator __node_allocator;
 typedef typename __table::__node __node;
 typedef __hash_map_node_destructor<__node_allocator> _Dp;
 typedef unique_ptr<__node, _Dp> __node_holder;
 typedef allocator_traits<allocator_type> __alloc_traits;

 static_assert((is_same<typename __table::__container_value_type, value_type>::value), "");
 static_assert((is_same<typename __table::__node_value_type, __value_type>::value), "");
public:
 typedef typename __alloc_traits::pointer pointer;
 typedef typename __alloc_traits::const_pointer const_pointer;
 typedef typename __table::size_type size_type;
 typedef typename __table::difference_type difference_type;

 typedef __hash_map_iterator<typename __table::iterator> iterator;
 typedef __hash_map_const_iterator<typename __table::const_iterator> const_iterator;
 typedef __hash_map_iterator<typename __table::local_iterator> local_iterator;
 typedef __hash_map_const_iterator<typename __table::const_local_iterator> const_local_iterator;

 _LIBCPP_INLINE_VISIBILITY
 unordered_map()
 _NOEXCEPT_(is_nothrow_default_constructible<__table>::value)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 }
 explicit unordered_map(size_type __n, const hasher& __hf = hasher(),
 const key_equal& __eql = key_equal());
 unordered_map(size_type __n, const hasher& __hf,
 const key_equal& __eql,
 const allocator_type& __a);
 template <class _InputIterator>
 unordered_map(_InputIterator __first, _InputIterator __last);
 template <class _InputIterator>
 unordered_map(_InputIterator __first, _InputIterator __last,
 size_type __n, const hasher& __hf = hasher(),
 const key_equal& __eql = key_equal());
 template <class _InputIterator>
 unordered_map(_InputIterator __first, _InputIterator __last,
 size_type __n, const hasher& __hf,
 const key_equal& __eql,
 const allocator_type& __a);
 _LIBCPP_INLINE_VISIBILITY
 explicit unordered_map(const allocator_type& __a);
 unordered_map(const unordered_map& __u);
 unordered_map(const unordered_map& __u, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(unordered_map&& __u)
 _NOEXCEPT_(is_nothrow_move_constructible<__table>::value);
 unordered_map(unordered_map&& __u, const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 unordered_map(initializer_list<value_type> __il);
 unordered_map(initializer_list<value_type> __il, size_type __n,
 const hasher& __hf = hasher(), const key_equal& __eql = key_equal());
 unordered_map(initializer_list<value_type> __il, size_type __n,
 const hasher& __hf, const key_equal& __eql,
 const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
#if _LIBCPP_STD_VER > 11
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(size_type __n, const allocator_type& __a)
 : unordered_map(__n, hasher(), key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(size_type __n, const hasher& __hf, const allocator_type& __a)
 : unordered_map(__n, __hf, key_equal(), __a) {}
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(_InputIterator __first, _InputIterator __last, size_type __n, const allocator_type& __a)
 : unordered_map(__first, __last, __n, hasher(), key_equal(), __a) {}
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(_InputIterator __first, _InputIterator __last, size_type __n, const hasher& __hf, 
 const allocator_type& __a)
 : unordered_map(__first, __last, __n, __hf, key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(initializer_list<value_type> __il, size_type __n, const allocator_type& __a)
 : unordered_map(__il, __n, hasher(), key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_map(initializer_list<value_type> __il, size_type __n, const hasher& __hf, 
 const allocator_type& __a)
 : unordered_map(__il, __n, __hf, key_equal(), __a) {}
#endif
 // ~unordered_map() = default;
 _LIBCPP_INLINE_VISIBILITY
 unordered_map& operator=(const unordered_map& __u)
 {
#ifndef _LIBCPP_CXX03_LANG
 __table_ = __u.__table_;
#else
 if (this != &__u) {
 __table_.clear();
 __table_.hash_function() = __u.__table_.hash_function();
 __table_.key_eq() = __u.__table_.key_eq();
 __table_.max_load_factor() = __u.__table_.max_load_factor();
 __table_.__copy_assign_alloc(__u.__table_);
 insert(__u.begin(), __u.end());
 }
#endif
 return *this;
 }
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 unordered_map& operator=(unordered_map&& __u)
 _NOEXCEPT_(is_nothrow_move_assignable<__table>::value);
#endif
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 unordered_map& operator=(initializer_list<value_type> __il);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const _NOEXCEPT
 {return allocator_type(__table_.__node_alloc());}

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

 _LIBCPP_INLINE_VISIBILITY
 iterator begin() _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 iterator end() _NOEXCEPT {return __table_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const _NOEXCEPT {return __table_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT {return __table_.end();}

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

 iterator insert(const_iterator __p, const value_type& __x) {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_map::insert(const_iterator, const value_type&) called with an iterator not"
 " referring to this unordered_map");
#endif
 return insert(__x).first;
 }

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 void insert(_InputIterator __first, _InputIterator __last);

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

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

 iterator insert(const_iterator __p, value_type&& __x) {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_map::insert(const_iterator, const value_type&) called with an iterator not"
 " referring to this unordered_map");
#endif
 return __table_.__insert_unique(_VSTD::move(__x)).first;
 }

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

 template <class _Pp,
 class = typename enable_if<is_constructible<value_type, _Pp>::value>::type>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, _Pp&& __x)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_map::insert(const_iterator, value_type&&) called with an iterator not"
 " referring to this unordered_map");
#endif
 return insert(_VSTD::forward<_Pp>(__x)).first;
 }

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

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace_hint(const_iterator __p, _Args&&... __args) {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_map::emplace_hint(const_iterator, args...) called with an iterator not"
 " referring to this unordered_map");
#endif
 return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first;
 }

#endif // _LIBCPP_CXX03_LANG

#if _LIBCPP_STD_VER > 14
 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> try_emplace(const key_type& __k, _Args&&... __args)
 {
 return __table_.__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 __table_.__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)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__h) == this,
 "unordered_map::try_emplace(const_iterator, key, args...) called with an iterator not"
 " referring to this unordered_map");
#endif
 return try_emplace(__k, _VSTD::forward<_Args>(__args)...).first;
 }

 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator try_emplace(const_iterator __h, key_type&& __k, _Args&&... __args)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__h) == this,
 "unordered_map::try_emplace(const_iterator, key, args...) called with an iterator not"
 " referring to this unordered_map");
#endif
 return try_emplace(_VSTD::move(__k), _VSTD::forward<_Args>(__args)...).first;
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert_or_assign(const key_type& __k, _Vp&& __v)
 {
 pair<iterator, bool> __res = __table_.__emplace_unique_key_args(__k,
 __k, _VSTD::forward<_Vp>(__v));
 if (!__res.second) {
 __res.first->second = _VSTD::forward<_Vp>(__v);
 }
 return __res;
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert_or_assign(key_type&& __k, _Vp&& __v)
 {
 pair<iterator, bool> __res = __table_.__emplace_unique_key_args(__k,
 _VSTD::move(__k), _VSTD::forward<_Vp>(__v));
 if (!__res.second) {
 __res.first->second = _VSTD::forward<_Vp>(__v);
 }
 return __res;
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert_or_assign(const_iterator __h, const key_type& __k, _Vp&& __v)
 {
 return insert_or_assign(__k, _VSTD::forward<_Vp>(__v)).first;
 }

 template <class _Vp>
 _LIBCPP_INLINE_VISIBILITY
 iterator insert_or_assign(const_iterator __h, key_type&& __k, _Vp&& __v)
 {
 return insert_or_assign(_VSTD::move(__k), _VSTD::forward<_Vp>(__v)).first;
 }
#endif

 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __table_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(iterator __p) {return __table_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type erase(const key_type& __k) {return __table_.__erase_unique(__k);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __first, const_iterator __last)
 {return __table_.erase(__first.__i_, __last.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__table_.clear();}

 _LIBCPP_INLINE_VISIBILITY
 void swap(unordered_map& __u)
 _NOEXCEPT_(__is_nothrow_swappable<__table>::value)
 {__table_.swap(__u.__table_);}

 _LIBCPP_INLINE_VISIBILITY
 hasher hash_function() const
 {return __table_.hash_function().hash_function();}
 _LIBCPP_INLINE_VISIBILITY
 key_equal key_eq() const
 {return __table_.key_eq().key_eq();}

 _LIBCPP_INLINE_VISIBILITY
 iterator find(const key_type& __k) {return __table_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator find(const key_type& __k) const {return __table_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 size_type count(const key_type& __k) const {return __table_.__count_unique(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, iterator> equal_range(const key_type& __k)
 {return __table_.__equal_range_unique(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
 {return __table_.__equal_range_unique(__k);}

 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
 size_type bucket_count() const _NOEXCEPT {return __table_.bucket_count();}
 _LIBCPP_INLINE_VISIBILITY
 size_type max_bucket_count() const _NOEXCEPT {return __table_.max_bucket_count();}

 _LIBCPP_INLINE_VISIBILITY
 size_type bucket_size(size_type __n) const
 {return __table_.bucket_size(__n);}
 _LIBCPP_INLINE_VISIBILITY
 size_type bucket(const key_type& __k) const {return __table_.bucket(__k);}

 _LIBCPP_INLINE_VISIBILITY
 local_iterator begin(size_type __n) {return __table_.begin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 local_iterator end(size_type __n) {return __table_.end(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator begin(size_type __n) const {return __table_.cbegin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator end(size_type __n) const {return __table_.cend(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator cbegin(size_type __n) const {return __table_.cbegin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator cend(size_type __n) const {return __table_.cend(__n);}

 _LIBCPP_INLINE_VISIBILITY
 float load_factor() const _NOEXCEPT {return __table_.load_factor();}
 _LIBCPP_INLINE_VISIBILITY
 float max_load_factor() const _NOEXCEPT {return __table_.max_load_factor();}
 _LIBCPP_INLINE_VISIBILITY
 void max_load_factor(float __mlf) {__table_.max_load_factor(__mlf);}
 _LIBCPP_INLINE_VISIBILITY
 void rehash(size_type __n) {__table_.rehash(__n);}
 _LIBCPP_INLINE_VISIBILITY
 void reserve(size_type __n) {__table_.reserve(__n);}

#if _LIBCPP_DEBUG_LEVEL >= 2

 bool __dereferenceable(const const_iterator* __i) const
 {return __table_.__dereferenceable(&__i->__i_);}
 bool __decrementable(const const_iterator* __i) const
 {return __table_.__decrementable(&__i->__i_);}
 bool __addable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(&__i->__i_, __n);}
 bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(&__i->__i_, __n);}

#endif // _LIBCPP_DEBUG_LEVEL >= 2

private:

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

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 size_type __n, const hasher& __hf, const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 size_type __n, const hasher& __hf, const key_equal& __eql,
 const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 const allocator_type& __a)
 : __table_(typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 _InputIterator __first, _InputIterator __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 _InputIterator __first, _InputIterator __last, size_type __n,
 const hasher& __hf, const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 _InputIterator __first, _InputIterator __last, size_type __n,
 const hasher& __hf, const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 const unordered_map& __u)
 : __table_(__u.__table_)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__u.bucket_count());
 insert(__u.begin(), __u.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 const unordered_map& __u, const allocator_type& __a)
 : __table_(__u.__table_, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__u.bucket_count());
 insert(__u.begin(), __u.end());
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 unordered_map&& __u)
 _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
 : __table_(_VSTD::move(__u.__table_))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
 __get_db()->swap(this, &__u);
#endif
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 unordered_map&& __u, const allocator_type& __a)
 : __table_(_VSTD::move(__u.__table_), typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__a != __u.get_allocator())
 {
 iterator __i = __u.begin();
 while (__u.size() != 0) {
 __table_.__emplace_unique(_VSTD::move(
 __u.__table_.remove((__i++).__i_)->__value_.__nc));
 }
 }
#if _LIBCPP_DEBUG_LEVEL >= 2
 else
 __get_db()->swap(this, &__u);
#endif
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 initializer_list<value_type> __il)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__il.begin(), __il.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__il.begin(), __il.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__il.begin(), __il.end());
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(unordered_map&& __u)
 _NOEXCEPT_(is_nothrow_move_assignable<__table>::value)
{
 __table_ = _VSTD::move(__u.__table_);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(
 initializer_list<value_type> __il)
{
 __table_.__assign_unique(__il.begin(), __il.end());
 return *this;
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifdef _LIBCPP_CXX03_LANG
template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
typename unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::__node_holder
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::__construct_node_with_key(const key_type& __k)
{
 __node_allocator& __na = __table_.__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
}
#endif

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
inline
void
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::insert(_InputIterator __first,
 _InputIterator __last)
{
 for (; __first != __last; ++__first)
 __table_.__insert_unique(*__first);
}

#ifdef _LIBCPP_CXX03_LANG
template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
_Tp&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator[](const key_type& __k)
{
 iterator __i = find(__k);
 if (__i != end())
 return __i->second;
 __node_holder __h = __construct_node_with_key(__k);
 pair<iterator, bool> __r = __table_.__node_insert_unique(__h.get());
 __h.release();
 return __r.first->second;
}
#else

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
_Tp&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator[](const key_type& __k)
{
 return __table_.__emplace_unique_key_args(__k,
 std::piecewise_construct, std::forward_as_tuple(__k),
 std::forward_as_tuple()).first->__cc.second;
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
_Tp&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator[](key_type&& __k)
{
 return __table_.__emplace_unique_key_args(__k,
 std::piecewise_construct, std::forward_as_tuple(std::move(__k)),
 std::forward_as_tuple()).first->__cc.second;
}

#endif // !_LIBCPP_CXX03_MODE

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
_Tp&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::at(const key_type& __k)
{
 iterator __i = find(__k);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__i == end())
 throw out_of_range("unordered_map::at: key not found");
#endif // _LIBCPP_NO_EXCEPTIONS
 return __i->second;
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
const _Tp&
unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::at(const key_type& __k) const
{
 const_iterator __i = find(__k);
#ifndef _LIBCPP_NO_EXCEPTIONS
 if (__i == end())
 throw out_of_range("unordered_map::at: key not found");
#endif // _LIBCPP_NO_EXCEPTIONS
 return __i->second;
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
bool
operator==(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
{
 if (__x.size() != __y.size())
 return false;
 typedef typename unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::const_iterator
 const_iterator;
 for (const_iterator __i = __x.begin(), __ex = __x.end(), __ey = __y.end();
 __i != __ex; ++__i)
 {
 const_iterator __j = __y.find(__i->first);
 if (__j == __ey || !(*__i == *__j))
 return false;
 }
 return true;
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 const unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
{
 return !(__x == __y);
}

template <class _Key, class _Tp, class _Hash = hash<_Key>, class _Pred = equal_to<_Key>,
 class _Alloc = allocator<pair<const _Key, _Tp> > >
class _LIBCPP_TYPE_VIS_ONLY unordered_multimap
{
public:
 // types
 typedef _Key key_type;
 typedef _Tp mapped_type;
 typedef _Hash hasher;
 typedef _Pred key_equal;
 typedef _Alloc allocator_type;
 typedef pair<const key_type, mapped_type> value_type;
 typedef pair<key_type, mapped_type> __nc_value_type;
 typedef value_type& reference;
 typedef const value_type& const_reference;
 static_assert((is_same<value_type, typename allocator_type::value_type>::value),
 "Invalid allocator::value_type");

private:
 typedef __hash_value_type<key_type, mapped_type> __value_type;
 typedef __unordered_map_hasher<key_type, __value_type, hasher> __hasher;
 typedef __unordered_map_equal<key_type, __value_type, key_equal> __key_equal;
 typedef typename __rebind_alloc_helper<allocator_traits<allocator_type>,
 __value_type>::type __allocator_type;

 typedef __hash_table<__value_type, __hasher,
 __key_equal, __allocator_type> __table;

 __table __table_;

 typedef typename __table::_NodeTypes _NodeTypes;
 typedef typename __table::__node_traits __node_traits;
 typedef typename __table::__node_allocator __node_allocator;
 typedef typename __table::__node __node;
 typedef __hash_map_node_destructor<__node_allocator> _Dp;
 typedef unique_ptr<__node, _Dp> __node_holder;
 typedef allocator_traits<allocator_type> __alloc_traits;
 static_assert((is_same<typename __node_traits::size_type,
 typename __alloc_traits::size_type>::value),
 "Allocator uses different size_type for different types");
public:
 typedef typename __alloc_traits::pointer pointer;
 typedef typename __alloc_traits::const_pointer const_pointer;
 typedef typename __table::size_type size_type;
 typedef typename __table::difference_type difference_type;

 typedef __hash_map_iterator<typename __table::iterator> iterator;
 typedef __hash_map_const_iterator<typename __table::const_iterator> const_iterator;
 typedef __hash_map_iterator<typename __table::local_iterator> local_iterator;
 typedef __hash_map_const_iterator<typename __table::const_local_iterator> const_local_iterator;

 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap()
 _NOEXCEPT_(is_nothrow_default_constructible<__table>::value)
 {
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 }
 explicit unordered_multimap(size_type __n, const hasher& __hf = hasher(),
 const key_equal& __eql = key_equal());
 unordered_multimap(size_type __n, const hasher& __hf,
 const key_equal& __eql,
 const allocator_type& __a);
 template <class _InputIterator>
 unordered_multimap(_InputIterator __first, _InputIterator __last);
 template <class _InputIterator>
 unordered_multimap(_InputIterator __first, _InputIterator __last,
 size_type __n, const hasher& __hf = hasher(),
 const key_equal& __eql = key_equal());
 template <class _InputIterator>
 unordered_multimap(_InputIterator __first, _InputIterator __last,
 size_type __n, const hasher& __hf,
 const key_equal& __eql,
 const allocator_type& __a);
 _LIBCPP_INLINE_VISIBILITY
 explicit unordered_multimap(const allocator_type& __a);
 unordered_multimap(const unordered_multimap& __u);
 unordered_multimap(const unordered_multimap& __u, const allocator_type& __a);
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(unordered_multimap&& __u)
 _NOEXCEPT_(is_nothrow_move_constructible<__table>::value);
 unordered_multimap(unordered_multimap&& __u, const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 unordered_multimap(initializer_list<value_type> __il);
 unordered_multimap(initializer_list<value_type> __il, size_type __n,
 const hasher& __hf = hasher(),
 const key_equal& __eql = key_equal());
 unordered_multimap(initializer_list<value_type> __il, size_type __n,
 const hasher& __hf, const key_equal& __eql,
 const allocator_type& __a);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
#if _LIBCPP_STD_VER > 11
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(size_type __n, const allocator_type& __a)
 : unordered_multimap(__n, hasher(), key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(size_type __n, const hasher& __hf, const allocator_type& __a)
 : unordered_multimap(__n, __hf, key_equal(), __a) {}
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(_InputIterator __first, _InputIterator __last, size_type __n, const allocator_type& __a)
 : unordered_multimap(__first, __last, __n, hasher(), key_equal(), __a) {}
 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(_InputIterator __first, _InputIterator __last, size_type __n, const hasher& __hf, 
 const allocator_type& __a)
 : unordered_multimap(__first, __last, __n, __hf, key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(initializer_list<value_type> __il, size_type __n, const allocator_type& __a)
 : unordered_multimap(__il, __n, hasher(), key_equal(), __a) {}
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap(initializer_list<value_type> __il, size_type __n, const hasher& __hf, 
 const allocator_type& __a)
 : unordered_multimap(__il, __n, __hf, key_equal(), __a) {}
#endif
 // ~unordered_multimap() = default;
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap& operator=(const unordered_multimap& __u)
 {
#ifndef _LIBCPP_CXX03_LANG
 __table_ = __u.__table_;
#else
 if (this != &__u) {
 __table_.clear();
 __table_.hash_function() = __u.__table_.hash_function();
 __table_.key_eq() = __u.__table_.key_eq();
 __table_.max_load_factor() = __u.__table_.max_load_factor();
 __table_.__copy_assign_alloc(__u.__table_);
 insert(__u.begin(), __u.end());
 }
#endif
 return *this;
 }
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap& operator=(unordered_multimap&& __u)
 _NOEXCEPT_(is_nothrow_move_assignable<__table>::value);
#endif
#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
 _LIBCPP_INLINE_VISIBILITY
 unordered_multimap& operator=(initializer_list<value_type> __il);
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

 _LIBCPP_INLINE_VISIBILITY
 allocator_type get_allocator() const _NOEXCEPT
 {return allocator_type(__table_.__node_alloc());}

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

 _LIBCPP_INLINE_VISIBILITY
 iterator begin() _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 iterator end() _NOEXCEPT {return __table_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator begin() const _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator end() const _NOEXCEPT {return __table_.end();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cbegin() const _NOEXCEPT {return __table_.begin();}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator cend() const _NOEXCEPT {return __table_.end();}

 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const value_type& __x) {return __table_.__insert_multi(__x);}

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

 template <class _InputIterator>
 _LIBCPP_INLINE_VISIBILITY
 void insert(_InputIterator __first, _InputIterator __last);

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

#ifndef _LIBCPP_CXX03_LANG
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(value_type&& __x) {return __table_.__insert_multi(_VSTD::move(__x));}

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

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

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

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

 template <class... _Args>
 iterator emplace_hint(const_iterator __p, _Args&&... __args) {
 return __table_.__emplace_hint_multi(__p.__i_, _VSTD::forward<_Args>(__args)...);
 }
#endif // _LIBCPP_CXX03_LANG


 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __table_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(iterator __p) {return __table_.erase(__p.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 size_type erase(const key_type& __k) {return __table_.__erase_multi(__k);}
 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __first, const_iterator __last)
 {return __table_.erase(__first.__i_, __last.__i_);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__table_.clear();}

 _LIBCPP_INLINE_VISIBILITY
 void swap(unordered_multimap& __u)
 _NOEXCEPT_(__is_nothrow_swappable<__table>::value)
 {__table_.swap(__u.__table_);}

 _LIBCPP_INLINE_VISIBILITY
 hasher hash_function() const
 {return __table_.hash_function().hash_function();}
 _LIBCPP_INLINE_VISIBILITY
 key_equal key_eq() const
 {return __table_.key_eq().key_eq();}

 _LIBCPP_INLINE_VISIBILITY
 iterator find(const key_type& __k) {return __table_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 const_iterator find(const key_type& __k) const {return __table_.find(__k);}
 _LIBCPP_INLINE_VISIBILITY
 size_type count(const key_type& __k) const {return __table_.__count_multi(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, iterator> equal_range(const key_type& __k)
 {return __table_.__equal_range_multi(__k);}
 _LIBCPP_INLINE_VISIBILITY
 pair<const_iterator, const_iterator> equal_range(const key_type& __k) const
 {return __table_.__equal_range_multi(__k);}

 _LIBCPP_INLINE_VISIBILITY
 size_type bucket_count() const _NOEXCEPT {return __table_.bucket_count();}
 _LIBCPP_INLINE_VISIBILITY
 size_type max_bucket_count() const _NOEXCEPT
 {return __table_.max_bucket_count();}

 _LIBCPP_INLINE_VISIBILITY
 size_type bucket_size(size_type __n) const
 {return __table_.bucket_size(__n);}
 _LIBCPP_INLINE_VISIBILITY
 size_type bucket(const key_type& __k) const {return __table_.bucket(__k);}

 _LIBCPP_INLINE_VISIBILITY
 local_iterator begin(size_type __n) {return __table_.begin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 local_iterator end(size_type __n) {return __table_.end(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator begin(size_type __n) const {return __table_.cbegin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator end(size_type __n) const {return __table_.cend(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator cbegin(size_type __n) const {return __table_.cbegin(__n);}
 _LIBCPP_INLINE_VISIBILITY
 const_local_iterator cend(size_type __n) const {return __table_.cend(__n);}

 _LIBCPP_INLINE_VISIBILITY
 float load_factor() const _NOEXCEPT {return __table_.load_factor();}
 _LIBCPP_INLINE_VISIBILITY
 float max_load_factor() const _NOEXCEPT {return __table_.max_load_factor();}
 _LIBCPP_INLINE_VISIBILITY
 void max_load_factor(float __mlf) {__table_.max_load_factor(__mlf);}
 _LIBCPP_INLINE_VISIBILITY
 void rehash(size_type __n) {__table_.rehash(__n);}
 _LIBCPP_INLINE_VISIBILITY
 void reserve(size_type __n) {__table_.reserve(__n);}

#if _LIBCPP_DEBUG_LEVEL >= 2

 bool __dereferenceable(const const_iterator* __i) const
 {return __table_.__dereferenceable(&__i->__i_);}
 bool __decrementable(const const_iterator* __i) const
 {return __table_.__decrementable(&__i->__i_);}
 bool __addable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(&__i->__i_, __n);}
 bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(&__i->__i_, __n);}

#endif // _LIBCPP_DEBUG_LEVEL >= 2


};

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 size_type __n, const hasher& __hf, const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 size_type __n, const hasher& __hf, const key_equal& __eql,
 const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 _InputIterator __first, _InputIterator __last)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 _InputIterator __first, _InputIterator __last, size_type __n,
 const hasher& __hf, const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 _InputIterator __first, _InputIterator __last, size_type __n,
 const hasher& __hf, const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__first, __last);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 const allocator_type& __a)
 : __table_(typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 const unordered_multimap& __u)
 : __table_(__u.__table_)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__u.bucket_count());
 insert(__u.begin(), __u.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 const unordered_multimap& __u, const allocator_type& __a)
 : __table_(__u.__table_, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__u.bucket_count());
 insert(__u.begin(), __u.end());
}

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 unordered_multimap&& __u)
 _NOEXCEPT_(is_nothrow_move_constructible<__table>::value)
 : __table_(_VSTD::move(__u.__table_))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
 __get_db()->swap(this, &__u);
#endif
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 unordered_multimap&& __u, const allocator_type& __a)
 : __table_(_VSTD::move(__u.__table_), typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 if (__a != __u.get_allocator())
 {
 iterator __i = __u.begin();
 while (__u.size() != 0)
 {
 __table_.__insert_multi(
 _VSTD::move(__u.__table_.remove((__i++).__i_)->__value_.__nc)
 );
 }
 }
#if _LIBCPP_DEBUG_LEVEL >= 2
 else
 __get_db()->swap(this, &__u);
#endif
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 initializer_list<value_type> __il)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__il.begin(), __il.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql)
 : __table_(__hf, __eql)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__il.begin(), __il.end());
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_multimap(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, typename __table::allocator_type(__a))
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 __table_.rehash(__n);
 insert(__il.begin(), __il.end());
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>&
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(unordered_multimap&& __u)
 _NOEXCEPT_(is_nothrow_move_assignable<__table>::value)
{
 __table_ = _VSTD::move(__u.__table_);
 return *this;
}

#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

#ifndef _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>&
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::operator=(
 initializer_list<value_type> __il)
{
 __table_.__assign_multi(__il.begin(), __il.end());
 return *this;
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS



template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
inline
void
unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::insert(_InputIterator __first,
 _InputIterator __last)
{
 for (; __first != __last; ++__first)
 __table_.__insert_multi(*__first);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline _LIBCPP_INLINE_VISIBILITY
void
swap(unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
 _NOEXCEPT_(_NOEXCEPT_(__x.swap(__y)))
{
 __x.swap(__y);
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
bool
operator==(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
{
 if (__x.size() != __y.size())
 return false;
 typedef typename unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>::const_iterator
 const_iterator;
 typedef pair<const_iterator, const_iterator> _EqRng;
 for (const_iterator __i = __x.begin(), __ex = __x.end(); __i != __ex;)
 {
 _EqRng __xeq = __x.equal_range(__i->first);
 _EqRng __yeq = __y.equal_range(__i->first);
 if (_VSTD::distance(__xeq.first, __xeq.second) !=
 _VSTD::distance(__yeq.first, __yeq.second) ||
 !_VSTD::is_permutation(__xeq.first, __xeq.second, __yeq.first))
 return false;
 __i = __xeq.second;
 }
 return true;
}

template <class _Key, class _Tp, class _Hash, class _Pred, class _Alloc>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __x,
 const unordered_multimap<_Key, _Tp, _Hash, _Pred, _Alloc>& __y)
{
 return !(__x == __y);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_UNORDERED_MAP