include/unordered_set

// -*- C++ -*-
//===-------------------------- unordered_set -----------------------------===//
//
// 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_SET
#define _LIBCPP_UNORDERED_SET

/*

 unordered_set synopsis

#include <initializer_list>

namespace std
{

template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
 class Alloc = allocator<Value>>
class unordered_set
{
public:
 // types
 typedef Value key_type;
 typedef key_type value_type;
 typedef Hash hasher;
 typedef Pred key_equal;
 typedef Alloc allocator_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_set()
 noexcept(
 is_nothrow_default_constructible<hasher>::value &&
 is_nothrow_default_constructible<key_equal>::value &&
 is_nothrow_default_constructible<allocator_type>::value);
 explicit unordered_set(size_type n, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 template <class InputIterator>
 unordered_set(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_set(const allocator_type&);
 unordered_set(const unordered_set&);
 unordered_set(const unordered_set&, const Allocator&);
 unordered_set(unordered_set&&)
 noexcept(
 is_nothrow_move_constructible<hasher>::value &&
 is_nothrow_move_constructible<key_equal>::value &&
 is_nothrow_move_constructible<allocator_type>::value);
 unordered_set(unordered_set&&, const Allocator&);
 unordered_set(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_set(size_type n, const allocator_type& a); // C++14
 unordered_set(size_type n, const hasher& hf, const allocator_type& a); // C++14
 template <class InputIterator>
 unordered_set(InputIterator f, InputIterator l, size_type n, const allocator_type& a); // C++14
 template <class InputIterator>
 unordered_set(InputIterator f, InputIterator l, size_type n, 
 const hasher& hf, const allocator_type& a); // C++14
 unordered_set(initializer_list<value_type> il, size_type n, const allocator_type& a); // C++14
 unordered_set(initializer_list<value_type> il, size_type n,
 const hasher& hf, const allocator_type& a); // C++14
 ~unordered_set();
 unordered_set& operator=(const unordered_set&);
 unordered_set& operator=(unordered_set&&)
 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_set& 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);
 pair<iterator, bool> insert(value_type&& obj);
 iterator insert(const_iterator hint, const value_type& obj);
 iterator insert(const_iterator hint, value_type&& 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_set&)
 noexcept(allocator_traits<Allocator>::is_always_equal::value &&
 noexcept(swap(declval<hasher&>(), declval<hasher&>())) &&
 noexcept(swap(declval<key_equal&>(), declval<key_equal&>()))); // C++17

 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 Value, class Hash, class Pred, class Alloc>
 void swap(unordered_set<Value, Hash, Pred, Alloc>& x,
 unordered_set<Value, Hash, Pred, Alloc>& y)
 noexcept(noexcept(x.swap(y)));

template <class Value, class Hash, class Pred, class Alloc>
 bool
 operator==(const unordered_set<Value, Hash, Pred, Alloc>& x,
 const unordered_set<Value, Hash, Pred, Alloc>& y);

template <class Value, class Hash, class Pred, class Alloc>
 bool
 operator!=(const unordered_set<Value, Hash, Pred, Alloc>& x,
 const unordered_set<Value, Hash, Pred, Alloc>& y);

template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
 class Alloc = allocator<Value>>
class unordered_multiset
{
public:
 // types
 typedef Value key_type;
 typedef key_type value_type;
 typedef Hash hasher;
 typedef Pred key_equal;
 typedef Alloc allocator_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_multiset()
 noexcept(
 is_nothrow_default_constructible<hasher>::value &&
 is_nothrow_default_constructible<key_equal>::value &&
 is_nothrow_default_constructible<allocator_type>::value);
 explicit unordered_multiset(size_type n, const hasher& hf = hasher(),
 const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 template <class InputIterator>
 unordered_multiset(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_multiset(const allocator_type&);
 unordered_multiset(const unordered_multiset&);
 unordered_multiset(const unordered_multiset&, const Allocator&);
 unordered_multiset(unordered_multiset&&)
 noexcept(
 is_nothrow_move_constructible<hasher>::value &&
 is_nothrow_move_constructible<key_equal>::value &&
 is_nothrow_move_constructible<allocator_type>::value);
 unordered_multiset(unordered_multiset&&, const Allocator&);
 unordered_multiset(initializer_list<value_type>, size_type n = /see below/,
 const hasher& hf = hasher(), const key_equal& eql = key_equal(),
 const allocator_type& a = allocator_type());
 unordered_multiset(size_type n, const allocator_type& a); // C++14
 unordered_multiset(size_type n, const hasher& hf, const allocator_type& a); // C++14
 template <class InputIterator>
 unordered_multiset(InputIterator f, InputIterator l, size_type n, const allocator_type& a); // C++14
 template <class InputIterator>
 unordered_multiset(InputIterator f, InputIterator l, size_type n,
 const hasher& hf, const allocator_type& a); // C++14
 unordered_multiset(initializer_list<value_type> il, size_type n, const allocator_type& a); // C++14
 unordered_multiset(initializer_list<value_type> il, size_type n, 
 const hasher& hf, const allocator_type& a); // C++14
 ~unordered_multiset();
 unordered_multiset& operator=(const unordered_multiset&);
 unordered_multiset& operator=(unordered_multiset&&)
 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_multiset& 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);
 iterator insert(value_type&& obj);
 iterator insert(const_iterator hint, const value_type& obj);
 iterator insert(const_iterator hint, value_type&& 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_multiset&)
 noexcept(allocator_traits<Allocator>::is_always_equal::value &&
 noexcept(swap(declval<hasher&>(), declval<hasher&>())) &&
 noexcept(swap(declval<key_equal&>(), declval<key_equal&>()))); // C++17

 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 Value, class Hash, class Pred, class Alloc>
 void swap(unordered_multiset<Value, Hash, Pred, Alloc>& x,
 unordered_multiset<Value, Hash, Pred, Alloc>& y)
 noexcept(noexcept(x.swap(y)));

template <class Value, class Hash, class Pred, class Alloc>
 bool
 operator==(const unordered_multiset<Value, Hash, Pred, Alloc>& x,
 const unordered_multiset<Value, Hash, Pred, Alloc>& y);

template <class Value, class Hash, class Pred, class Alloc>
 bool
 operator!=(const unordered_multiset<Value, Hash, Pred, Alloc>& x,
 const unordered_multiset<Value, Hash, Pred, Alloc>& y);
} // std

*/

#include <__config>
#include <__hash_table>
#include <functional>

#include <__debug>

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

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
 class _Alloc = allocator<_Value> >
class _LIBCPP_TYPE_VIS_ONLY unordered_set
{
public:
 // types
 typedef _Value key_type;
 typedef key_type value_type;
 typedef _Hash hasher;
 typedef _Pred key_equal;
 typedef _Alloc allocator_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_table<value_type, hasher, key_equal, allocator_type> __table;

 __table __table_;

public:
 typedef typename __table::pointer pointer;
 typedef typename __table::const_pointer const_pointer;
 typedef typename __table::size_type size_type;
 typedef typename __table::difference_type difference_type;

 typedef typename __table::const_iterator iterator;
 typedef typename __table::const_iterator const_iterator;
 typedef typename __table::const_local_iterator local_iterator;
 typedef typename __table::const_local_iterator const_local_iterator;

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

#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
 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
#if _LIBCPP_DEBUG_LEVEL >= 2
 iterator emplace_hint(const_iterator __p, _Args&&... __args)
 {
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_set::emplace_hint(const_iterator, args...) called with an iterator not"
 " referring to this unordered_set");
 return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first;
 }
#else
 iterator emplace_hint(const_iterator, _Args&&... __args)
 {return __table_.__emplace_unique(_VSTD::forward<_Args>(__args)...).first;}
#endif
#endif // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert(const value_type& __x)
 {return __table_.__insert_unique(__x);}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 pair<iterator, bool> insert(value_type&& __x)
 {return __table_.__insert_unique(_VSTD::move(__x));}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
#if _LIBCPP_DEBUG_LEVEL >= 2
 iterator insert(const_iterator __p, const value_type& __x)
 {
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_set::insert(const_iterator, const value_type&) called with an iterator not"
 " referring to this unordered_set");
 return insert(__x).first;
 }
#else
 iterator insert(const_iterator, const value_type& __x)
 {return insert(__x).first;}
#endif
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
#if _LIBCPP_DEBUG_LEVEL >= 2
 iterator insert(const_iterator __p, value_type&& __x)
 {
 _LIBCPP_ASSERT(__get_const_db()->__find_c_from_i(&__p) == this,
 "unordered_set::insert(const_iterator, value_type&&) called with an iterator not"
 " referring to this unordered_set");
 return insert(_VSTD::move(__x)).first;
 }
#else
 iterator insert(const_iterator, value_type&& __x)
 {return insert(_VSTD::move(__x)).first;}
#endif
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 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

 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __table_.erase(__p);}
 _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, __last);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__table_.clear();}

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

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

 _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);}
 bool __decrementable(const const_iterator* __i) const
 {return __table_.__decrementable(__i);}
 bool __addable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(__i, __n);}
 bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(__i, __n);}

#endif // _LIBCPP_DEBUG_LEVEL >= 2

};

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

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

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

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

template <class _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 const unordered_set& __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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 const unordered_set& __u, const allocator_type& __a)
 : __table_(__u.__table_, __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 unordered_set&& __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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 unordered_set&& __u, const allocator_type& __a)
 : __table_(_VSTD::move(__u.__table_), __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_unique(_VSTD::move(__u.__table_.remove(__i++)->__value_));
 }
#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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 initializer_list<value_type> __il)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__il.begin(), __il.end());
}

template <class _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_set<_Value, _Hash, _Pred, _Alloc>&
unordered_set<_Value, _Hash, _Pred, _Alloc>::operator=(unordered_set&& __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_set<_Value, _Hash, _Pred, _Alloc>&
unordered_set<_Value, _Hash, _Pred, _Alloc>::operator=(
 initializer_list<value_type> __il)
{
 __table_.__assign_unique(__il.begin(), __il.end());
 return *this;
}

#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS

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

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

template <class _Value, class _Hash, class _Pred, class _Alloc>
bool
operator==(const unordered_set<_Value, _Hash, _Pred, _Alloc>& __x,
 const unordered_set<_Value, _Hash, _Pred, _Alloc>& __y)
{
 if (__x.size() != __y.size())
 return false;
 typedef typename unordered_set<_Value, _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);
 if (__j == __ey || !(*__i == *__j))
 return false;
 }
 return true;
}

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

template <class _Value, class _Hash = hash<_Value>, class _Pred = equal_to<_Value>,
 class _Alloc = allocator<_Value> >
class _LIBCPP_TYPE_VIS_ONLY unordered_multiset
{
public:
 // types
 typedef _Value key_type;
 typedef key_type value_type;
 typedef _Hash hasher;
 typedef _Pred key_equal;
 typedef _Alloc allocator_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_table<value_type, hasher, key_equal, allocator_type> __table;

 __table __table_;

public:
 typedef typename __table::pointer pointer;
 typedef typename __table::const_pointer const_pointer;
 typedef typename __table::size_type size_type;
 typedef typename __table::difference_type difference_type;

 typedef typename __table::const_iterator iterator;
 typedef typename __table::const_iterator const_iterator;
 typedef typename __table::const_local_iterator local_iterator;
 typedef typename __table::const_local_iterator const_local_iterator;

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

#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace(_Args&&... __args)
 {return __table_.__emplace_multi(_VSTD::forward<_Args>(__args)...);}
 template <class... _Args>
 _LIBCPP_INLINE_VISIBILITY
 iterator emplace_hint(const_iterator __p, _Args&&... __args)
 {return __table_.__emplace_hint_multi(__p, _VSTD::forward<_Args>(__args)...);}
#endif // !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const value_type& __x) {return __table_.__insert_multi(__x);}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(value_type&& __x) {return __table_.__insert_multi(_VSTD::move(__x));}
#endif
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, const value_type& __x)
 {return __table_.__insert_multi(__p, __x);}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 _LIBCPP_INLINE_VISIBILITY
 iterator insert(const_iterator __p, value_type&& __x)
 {return __table_.__insert_multi(__p, _VSTD::move(__x));}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 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

 _LIBCPP_INLINE_VISIBILITY
 iterator erase(const_iterator __p) {return __table_.erase(__p);}
 _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, __last);}
 _LIBCPP_INLINE_VISIBILITY
 void clear() _NOEXCEPT {__table_.clear();}

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

 _LIBCPP_INLINE_VISIBILITY
 hasher hash_function() const {return __table_.hash_function();}
 _LIBCPP_INLINE_VISIBILITY
 key_equal key_eq() const {return __table_.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);}
 bool __decrementable(const const_iterator* __i) const
 {return __table_.__decrementable(__i);}
 bool __addable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(__i, __n);}
 bool __subscriptable(const const_iterator* __i, ptrdiff_t __n) const
 {return __table_.__addable(__i, __n);}

#endif // _LIBCPP_DEBUG_LEVEL >= 2

};

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

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

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

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

template <class _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 const unordered_multiset& __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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 const unordered_multiset& __u, const allocator_type& __a)
 : __table_(__u.__table_, __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 unordered_multiset&& __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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 unordered_multiset&& __u, const allocator_type& __a)
 : __table_(_VSTD::move(__u.__table_), __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++)->__value_));
 }
#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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 initializer_list<value_type> __il)
{
#if _LIBCPP_DEBUG_LEVEL >= 2
 __get_db()->__insert_c(this);
#endif
 insert(__il.begin(), __il.end());
}

template <class _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 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 _Value, class _Hash, class _Pred, class _Alloc>
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::unordered_multiset(
 initializer_list<value_type> __il, size_type __n, const hasher& __hf,
 const key_equal& __eql, const allocator_type& __a)
 : __table_(__hf, __eql, __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_multiset<_Value, _Hash, _Pred, _Alloc>&
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::operator=(
 unordered_multiset&& __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 _Value, class _Hash, class _Pred, class _Alloc>
inline
unordered_multiset<_Value, _Hash, _Pred, _Alloc>&
unordered_multiset<_Value, _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 _Value, class _Hash, class _Pred, class _Alloc>
template <class _InputIterator>
inline
void
unordered_multiset<_Value, _Hash, _Pred, _Alloc>::insert(_InputIterator __first,
 _InputIterator __last)
{
 for (; __first != __last; ++__first)
 __table_.__insert_multi(*__first);
}

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

template <class _Value, class _Hash, class _Pred, class _Alloc>
bool
operator==(const unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __x,
 const unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __y)
{
 if (__x.size() != __y.size())
 return false;
 typedef typename unordered_multiset<_Value, _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);
 _EqRng __yeq = __y.equal_range(*__i);
 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 _Value, class _Hash, class _Pred, class _Alloc>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __x,
 const unordered_multiset<_Value, _Hash, _Pred, _Alloc>& __y)
{
 return !(__x == __y);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_UNORDERED_SET