Public Types

typedef _Hashtable::key_type	key_type

typedef _Hashtable::value_type	value_type

typedef _Hashtable::mapped_type	mapped_type

typedef _Hashtable::hasher	hasher

typedef _Hashtable::key_equal	key_equal

typedef _Hashtable::allocator_type	allocator_type


typedef _Hashtable::pointer	pointer

typedef _Hashtable::const_pointer	const_pointer

typedef _Hashtable::reference	reference

typedef _Hashtable::const_reference	const_reference

typedef _Hashtable::iterator	iterator

typedef _Hashtable::const_iterator	const_iterator

typedef _Hashtable::local_iterator	local_iterator

typedef _Hashtable::const_local_iterator	const_local_iterator

typedef _Hashtable::size_type	size_type

typedef _Hashtable::difference_type	difference_type

Public Member Functions
	unordered_multimap ()=default

	unordered_multimap (size_type __n, const hasher &__hf=hasher(), const key_equal &__eql=key_equal(), const allocator_type &__a=allocator_type())

template<typename _InputIterator >
	unordered_multimap (_InputIterator __first, _InputIterator __last, size_type __n=0, const hasher &__hf=hasher(), const key_equal &__eql=key_equal(), const allocator_type &__a=allocator_type())

	unordered_multimap (const unordered_multimap &)=default

	unordered_multimap (unordered_multimap &&)=default

	unordered_multimap (const allocator_type &__a)

	unordered_multimap (const unordered_multimap &__ummap, const allocator_type &__a)

	unordered_multimap (unordered_multimap &&__ummap, const allocator_type &__a)

	unordered_multimap (initializer_list< value_type > __l, 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 (size_type __n, const hasher &__hf, const allocator_type &__a)

template<typename _InputIterator >
	unordered_multimap (_InputIterator __first, _InputIterator __last, size_type __n, const allocator_type &__a)

template<typename _InputIterator >
	unordered_multimap (_InputIterator __first, _InputIterator __last, size_type __n, const hasher &__hf, const allocator_type &__a)

	unordered_multimap (initializer_list< value_type > __l, size_type __n, const allocator_type &__a)

	unordered_multimap (initializer_list< value_type > __l, size_type __n, const hasher &__hf, const allocator_type &__a)

iterator	begin () noexcept

local_iterator	begin (size_type __n)

size_type	bucket (const key_type &__key) const

size_type	bucket_count () const noexcept

size_type	bucket_size (size_type __n) const

void	clear () noexcept

size_type	count (const key_type &__x) const

template<typename... _Args>
iterator	emplace (_Args &&... __args)

template<typename... _Args>
iterator	emplace_hint (const_iterator __pos, _Args &&... __args)

_GLIBCXX_NODISCARD bool	empty () const noexcept

iterator	end () noexcept

local_iterator	end (size_type __n)

size_type	erase (const key_type &__x)

iterator	erase (const_iterator __first, const_iterator __last)

allocator_type	get_allocator () const noexcept

hasher	hash_function () const

template<typename _InputIterator >
void	insert (_InputIterator __first, _InputIterator __last)

void	insert (initializer_list< value_type > __l)

key_equal	key_eq () const

float	load_factor () const noexcept

size_type	max_bucket_count () const noexcept

float	max_load_factor () const noexcept

void	max_load_factor (float __z)

size_type	max_size () const noexcept

unordered_multimap &	operator= (const unordered_multimap &)=default

unordered_multimap &	operator= (unordered_multimap &&)=default

unordered_multimap &	operator= (initializer_list< value_type > __l)

void	rehash (size_type __n)

void	reserve (size_type __n)

size_type	size () const noexcept

void	swap (unordered_multimap &__x) noexcept(noexcept(_M_h.swap(__x._M_h)))


const_iterator	begin () const noexcept

const_iterator	cbegin () const noexcept


const_iterator	end () const noexcept

const_iterator	cend () const noexcept


iterator	insert (const value_type &__x)

iterator	insert (value_type &&__x)

template<typename _Pair >
__enable_if_t< is_constructible< value_type, _Pair && >::value, iterator >	insert (_Pair &&__x)


iterator	insert (const_iterator __hint, const value_type &__x)

iterator	insert (const_iterator __hint, value_type &&__x)

template<typename _Pair >
__enable_if_t< is_constructible< value_type, _Pair && >::value, iterator >	insert (const_iterator __hint, _Pair &&__x)


iterator	erase (const_iterator __position)

iterator	erase (iterator __position)


iterator	find (const key_type &__x)

const_iterator	find (const key_type &__x) const


std::pair< iterator, iterator >	equal_range (const key_type &__x)

std::pair< const_iterator, const_iterator >	equal_range (const key_type &__x) const


const_local_iterator	begin (size_type __n) const

const_local_iterator	cbegin (size_type __n) const


const_local_iterator	end (size_type __n) const

const_local_iterator	cend (size_type __n) const

Friends
template<typename _Key1 , typename _Tp1 , typename _Hash1 , typename _Pred1 , typename _Alloc1 >
bool	operator== (const unordered_multimap< _Key1, _Tp1, _Hash1, _Pred1, _Alloc1 > &, const unordered_multimap< _Key1, _Tp1, _Hash1, _Pred1, _Alloc1 > &)

Detailed Description

template<typename _Key, typename _Tp, typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>
class std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >

A standard container composed of equivalent keys (possibly containing multiple of each key value) that associates values of another type with the keys.

Template Parameters

_Key	Type of key objects.
_Tp	Type of mapped objects.
_Hash	Hashing function object type, defaults to hash<_Value>.
_Pred	Predicate function object type, defaults to equal_to<_Value>.
_Alloc	Allocator type, defaults to std::allocator<std::pair<const _Key, _Tp>>.

Meets the requirements of a container, and unordered associative container

The resulting value type of the container is std::pair<const _Key, _Tp>.

Base is _Hashtable, dispatched at compile time via template alias __ummap_hashtable.

Definition at line 73 of file unordered_map.h.

Member Typedef Documentation

◆ allocator_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::allocator_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::allocator_type

Public typedefs.

Definition at line 1264 of file unordered_map.h.

◆ const_iterator

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::const_iterator

Iterator-related typedefs.

Definition at line 1274 of file unordered_map.h.

◆ const_local_iterator

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::const_local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::const_local_iterator

Iterator-related typedefs.

Definition at line 1276 of file unordered_map.h.

◆ const_pointer

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::const_pointer std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::const_pointer

Iterator-related typedefs.

Definition at line 1270 of file unordered_map.h.

◆ const_reference

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::const_reference std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::const_reference

Iterator-related typedefs.

Definition at line 1272 of file unordered_map.h.

◆ difference_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::difference_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::difference_type

Iterator-related typedefs.

Definition at line 1278 of file unordered_map.h.

◆ hasher

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::hasher std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::hasher

Public typedefs.

Definition at line 1262 of file unordered_map.h.

◆ iterator

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::iterator

Iterator-related typedefs.

Definition at line 1273 of file unordered_map.h.

◆ key_equal

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::key_equal std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::key_equal

Public typedefs.

Definition at line 1263 of file unordered_map.h.

◆ key_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::key_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::key_type

Public typedefs.

Definition at line 1259 of file unordered_map.h.

◆ local_iterator

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::local_iterator

Iterator-related typedefs.

Definition at line 1275 of file unordered_map.h.

◆ mapped_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::mapped_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::mapped_type

Public typedefs.

Definition at line 1261 of file unordered_map.h.

◆ pointer

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::pointer std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::pointer

Iterator-related typedefs.

Definition at line 1269 of file unordered_map.h.

◆ reference

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::reference std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::reference

Iterator-related typedefs.

Definition at line 1271 of file unordered_map.h.

◆ size_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::size_type

Iterator-related typedefs.

Definition at line 1277 of file unordered_map.h.

◆ value_type

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

typedef _Hashtable::value_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::value_type

Public typedefs.

Definition at line 1260 of file unordered_map.h.

Constructor & Destructor Documentation

◆ unordered_multimap() [1/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap ( )

default

Default constructor.

◆ unordered_multimap() [2/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap	(	size_type	__n,
		const hasher &	__hf = `hasher()`,
		const key_equal &	__eql = `key_equal()`,
		const allocator_type &	__a = `allocator_type()`
	)

inlineexplicit

Default constructor creates no elements.

Parameters

__n	Mnimal initial number of buckets.
__hf	A hash functor.
__eql	A key equality functor.
__a	An allocator object.

Definition at line 1298 of file unordered_map.h.

◆ unordered_multimap() [3/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename _InputIterator >

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap	(	_InputIterator	__first,
		_InputIterator	__last,
		size_type	__n = `0`,
		const hasher &	__hf = `hasher()`,
		const key_equal &	__eql = `key_equal()`,
		const allocator_type &	__a = `allocator_type()`
	)

inline

Builds an unordered_multimap from a range.

Parameters

__first	An input iterator.
__last	An input iterator.
__n	Minimal initial number of buckets.
__hf	A hash functor.
__eql	A key equality functor.
__a	An allocator object.

Create an unordered_multimap consisting of copies of the elements from [__first,__last). This is linear in N (where N is distance(__first,__last)).

Definition at line 1319 of file unordered_map.h.

◆ unordered_multimap() [4/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap ( const unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc > & )

default

Copy constructor.

◆ unordered_multimap() [5/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap ( unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc > && )

default

Move constructor.

◆ unordered_multimap() [6/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap ( const allocator_type & __a )

inlineexplicit

Creates an unordered_multimap with no elements.

Parameters

__a	An allocator object.

Definition at line 1338 of file unordered_map.h.

◆ unordered_multimap() [7/7]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::unordered_multimap	(	initializer_list< value_type >	__l,
		size_type	__n = `0`,
		const hasher &	__hf = `hasher()`,
		const key_equal &	__eql = `key_equal()`,
		const allocator_type &	__a = `allocator_type()`
	)

inline

Builds an unordered_multimap from an initializer_list.

Parameters

__l	An initializer_list.
__n	Minimal initial number of buckets.
__hf	A hash functor.
__eql	A key equality functor.
__a	An allocator object.

Create an unordered_multimap consisting of copies of the elements in the list. This is linear in N (where N is __l.size()).

Definition at line 1373 of file unordered_map.h.

Member Function Documentation

◆ begin() [1/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::begin ( )

inlinenoexcept

Returns a read/write iterator that points to the first element in the unordered_multimap.

Definition at line 1471 of file unordered_map.h.

◆ begin() [2/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::begin ( ) const

inlinenoexcept

Returns a read-only (constant) iterator that points to the first element in the unordered_multimap.

Definition at line 1480 of file unordered_map.h.

◆ begin() [3/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::begin ( size_type __n )

inline

Returns a read/write iterator pointing to the first bucket element.

Parameters

__n	The bucket index.

Returns: A read/write local iterator.

Definition at line 1896 of file unordered_map.h.

◆ begin() [4/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::begin ( size_type __n ) const

inline

Returns a read-only (constant) iterator pointing to the first bucket element.

Parameters

__n	The bucket index.

Returns: A read-only local iterator.

Definition at line 1907 of file unordered_map.h.

◆ bucket_count()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::bucket_count ( ) const

inlinenoexcept

Returns the number of buckets of the unordered_multimap.

Definition at line 1863 of file unordered_map.h.

◆ cbegin() [1/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::cbegin ( ) const

inlinenoexcept

Returns a read-only (constant) iterator that points to the first element in the unordered_multimap.

Definition at line 1484 of file unordered_map.h.

◆ cbegin() [2/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::cbegin ( size_type __n ) const

inline

Returns a read-only (constant) iterator pointing to the first bucket element.

Parameters

__n	The bucket index.

Returns: A read-only local iterator.

Definition at line 1911 of file unordered_map.h.

◆ cend() [1/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::cend ( ) const

inlinenoexcept

Returns a read-only (constant) iterator that points one past the last element in the unordered_multimap.

Definition at line 1506 of file unordered_map.h.

◆ cend() [2/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::cend ( size_type __n ) const

inline

Returns a read-only (constant) iterator pointing to one past the last bucket elements.

Parameters

__n	The bucket index.

Returns: A read-only local iterator.

Definition at line 1937 of file unordered_map.h.

◆ clear()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::clear ( )

inlinenoexcept

Erases all elements in an unordered_multimap. Note that this function only erases the elements, and that if the elements themselves are pointers, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

Definition at line 1735 of file unordered_map.h.

◆ count()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::count ( const key_type & __x ) const

inline

Finds the number of elements.

Parameters

__x	Key to count.

Returns: Number of elements with specified key.

Definition at line 1829 of file unordered_map.h.

◆ emplace()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename... _Args>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::emplace ( _Args &&... __args )

inline

Attempts to build and insert a std::pair into the unordered_multimap.

Parameters

__args Arguments used to generate a new pair instance (see std::piecewise_contruct for passing arguments to each part of the pair constructor).

Returns: An iterator that points to the inserted pair.

This function attempts to build and insert a (key, value) pair into the unordered_multimap.

Insertion requires amortized constant time.

Definition at line 1529 of file unordered_map.h.

◆ emplace_hint()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename... _Args>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::emplace_hint	(	const_iterator	__pos,
		_Args &&...	__args
	)

inline

Attempts to build and insert a std::pair into the unordered_multimap.

Parameters

__pos	An iterator that serves as a hint as to where the pair should be inserted.
__args	Arguments used to generate a new pair instance (see std::piecewise_contruct for passing arguments to each part of the pair constructor).

Returns: An iterator that points to the element with key of the std::pair built from __args.

Note that the first parameter is only a hint and can potentially improve the performance of the insertion process. A bad hint would cause no gains in efficiency.

See https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints for more on hinting.

Insertion requires amortized constant time.

Definition at line 1556 of file unordered_map.h.

◆ empty()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

_GLIBCXX_NODISCARD bool std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::empty ( ) const

inlinenoexcept

Returns true if the unordered_multimap is empty.

Definition at line 1451 of file unordered_map.h.

◆ end() [1/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::end ( )

inlinenoexcept

Returns a read/write iterator that points one past the last element in the unordered_multimap.

Definition at line 1493 of file unordered_map.h.

◆ end() [2/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::end ( ) const

inlinenoexcept

Returns a read-only (constant) iterator that points one past the last element in the unordered_multimap.

Definition at line 1502 of file unordered_map.h.

◆ end() [3/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::end ( size_type __n )

inline

Returns a read/write iterator pointing to one past the last bucket elements.

Parameters

__n	The bucket index.

Returns: A read/write local iterator.

Definition at line 1922 of file unordered_map.h.

◆ end() [4/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_local_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::end ( size_type __n ) const

inline

Returns a read-only (constant) iterator pointing to one past the last bucket elements.

Parameters

__n	The bucket index.

Returns: A read-only local iterator.

Definition at line 1933 of file unordered_map.h.

◆ equal_range() [1/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::pair<iterator, iterator> std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::equal_range ( const key_type & __x )

inline

Finds a subsequence matching given key.

Parameters

__x	Key to be located.

Returns: Pair of iterators that possibly points to the subsequence matching given key.

Definition at line 1851 of file unordered_map.h.

◆ equal_range() [2/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

std::pair<const_iterator, const_iterator> std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::equal_range ( const key_type & __x ) const

inline

Finds a subsequence matching given key.

Parameters

__x	Key to be located.

Returns: Pair of iterators that possibly points to the subsequence matching given key.

Definition at line 1855 of file unordered_map.h.

◆ erase() [1/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::erase ( const_iterator __position )

inline

Erases an element from an unordered_multimap.

Parameters

__position An iterator pointing to the element to be erased.

Returns: An iterator pointing to the element immediately following __position prior to the element being erased. If no such element exists, end() is returned.

This function erases an element, pointed to by the given iterator, from an unordered_multimap. Note that this function only erases the element, and that if the element is itself a pointer, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

Definition at line 1685 of file unordered_map.h.

◆ erase() [2/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::erase ( iterator __position )

inline

Erases an element from an unordered_multimap.

Parameters

__position An iterator pointing to the element to be erased.

Returns: An iterator pointing to the element immediately following __position prior to the element being erased. If no such element exists, end() is returned.

This function erases an element, pointed to by the given iterator, from an unordered_multimap. Note that this function only erases the element, and that if the element is itself a pointer, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

Definition at line 1690 of file unordered_map.h.

◆ erase() [3/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::erase ( const key_type & __x )

inline

Erases elements according to the provided key.

Parameters

__x	Key of elements to be erased.

Returns: The number of elements erased.

This function erases all the elements located by the given key from an unordered_multimap. Note that this function only erases the element, and that if the element is itself a pointer, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

Definition at line 1706 of file unordered_map.h.

◆ erase() [4/4]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::erase	(	const_iterator	__first,
		const_iterator	__last
	)

inline

Erases a [__first,__last) range of elements from an unordered_multimap.

Parameters

__first	Iterator pointing to the start of the range to be erased.
__last	Iterator pointing to the end of the range to be erased.

Returns: The iterator __last.

This function erases a sequence of elements from an unordered_multimap. Note that this function only erases the elements, and that if the element is itself a pointer, the pointed-to memory is not touched in any way. Managing the pointer is the user's responsibility.

Definition at line 1725 of file unordered_map.h.

◆ find() [1/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::find ( const key_type & __x )

inline

Tries to locate an element in an unordered_multimap.

Parameters

__x	Key to be located.

Returns: Iterator pointing to sought-after element, or end() if not found.

This function takes a key and tries to locate the element with which the key matches. If successful the function returns an iterator pointing to the sought after element. If unsuccessful it returns the past-the-end ( end() ) iterator.

Definition at line 1815 of file unordered_map.h.

◆ find() [2/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

const_iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::find ( const key_type & __x ) const

inline

Tries to locate an element in an unordered_multimap.

Parameters

__x	Key to be located.

Returns: Iterator pointing to sought-after element, or end() if not found.

This function takes a key and tries to locate the element with which the key matches. If successful the function returns an iterator pointing to the sought after element. If unsuccessful it returns the past-the-end ( end() ) iterator.

Definition at line 1819 of file unordered_map.h.

◆ get_allocator()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

allocator_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::get_allocator ( ) const

inlinenoexcept

Returns the allocator object used by the unordered_multimap.

Definition at line 1444 of file unordered_map.h.

◆ hash_function()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

hasher std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::hash_function ( ) const

inline

Returns the hash functor object with which the unordered_multimap was constructed.

Definition at line 1791 of file unordered_map.h.

◆ insert() [1/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert ( const value_type & __x )

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the inserted pair.

Insertion requires amortized constant time.

Definition at line 1570 of file unordered_map.h.

◆ insert() [2/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert ( value_type && __x )

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the inserted pair.

Insertion requires amortized constant time.

Definition at line 1574 of file unordered_map.h.

◆ insert() [3/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename _Pair >

__enable_if_t<is_constructible<value_type, _Pair&&>::value, iterator> std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert ( _Pair && __x )

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the inserted pair.

Insertion requires amortized constant time.

Definition at line 1579 of file unordered_map.h.

◆ insert() [4/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert	(	const_iterator	__hint,
		const value_type &	__x
	)

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__hint	An iterator that serves as a hint as to where the pair should be inserted.
__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the element with key of __x (may or may not be the pair passed in).

Note that the first parameter is only a hint and can potentially improve the performance of the insertion process. A bad hint would cause no gains in efficiency.

See https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints for more on hinting.

Insertion requires amortized constant time.

Definition at line 1604 of file unordered_map.h.

◆ insert() [5/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

iterator std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert	(	const_iterator	__hint,
		value_type &&	__x
	)

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__hint	An iterator that serves as a hint as to where the pair should be inserted.
__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the element with key of __x (may or may not be the pair passed in).

Note that the first parameter is only a hint and can potentially improve the performance of the insertion process. A bad hint would cause no gains in efficiency.

See https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints for more on hinting.

Insertion requires amortized constant time.

Definition at line 1610 of file unordered_map.h.

◆ insert() [6/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename _Pair >

__enable_if_t<is_constructible<value_type, _Pair&&>::value, iterator> std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert	(	const_iterator	__hint,
		_Pair &&	__x
	)

inline

Inserts a std::pair into the unordered_multimap.

Parameters

__hint	An iterator that serves as a hint as to where the pair should be inserted.
__x	Pair to be inserted (see std::make_pair for easy creation of pairs).

Returns: An iterator that points to the element with key of __x (may or may not be the pair passed in).

Note that the first parameter is only a hint and can potentially improve the performance of the insertion process. A bad hint would cause no gains in efficiency.

See https://gcc.gnu.org/onlinedocs/libstdc++/manual/associative.html#containers.associative.insert_hints for more on hinting.

Insertion requires amortized constant time.

Definition at line 1615 of file unordered_map.h.

◆ insert() [7/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

template<typename _InputIterator >

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert	(	_InputIterator	__first,
		_InputIterator	__last
	)

inline

A template function that attempts to insert a range of elements.

Parameters

__first	Iterator pointing to the start of the range to be inserted.
__last	Iterator pointing to the end of the range.

Complexity similar to that of the range constructor.

Definition at line 1630 of file unordered_map.h.

◆ insert() [8/8]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::insert ( initializer_list< value_type > __l )

inline

Attempts to insert a list of elements into the unordered_multimap.

Parameters

__l	A std::initializer_list<value_type> of elements to be inserted.

Complexity similar to that of the range constructor.

Definition at line 1642 of file unordered_map.h.

◆ key_eq()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

key_equal std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::key_eq ( ) const

inline

Returns the key comparison object with which the unordered_multimap was constructed.

Definition at line 1797 of file unordered_map.h.

◆ load_factor()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

float std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::load_factor ( ) const

inlinenoexcept

Returns the average number of elements per bucket.

Definition at line 1945 of file unordered_map.h.

◆ max_bucket_count()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::max_bucket_count ( ) const

inlinenoexcept

Returns the maximum number of buckets of the unordered_multimap.

Definition at line 1868 of file unordered_map.h.

◆ max_load_factor() [1/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

float std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::max_load_factor ( ) const

inlinenoexcept

Returns a positive number that the unordered_multimap tries to keep the load factor less than or equal to.

Definition at line 1951 of file unordered_map.h.

◆ max_load_factor() [2/2]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::max_load_factor ( float __z )

inline

Change the unordered_multimap maximum load factor.

Parameters

__z	The new maximum load factor.

Definition at line 1959 of file unordered_map.h.

◆ max_size()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::max_size ( ) const

inlinenoexcept

Returns the maximum size of the unordered_multimap.

Definition at line 1461 of file unordered_map.h.

◆ operator=() [1/3]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

unordered_multimap& std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::operator= ( const unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc > & )

default

Copy assignment operator.

◆ operator=() [2/3]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

unordered_multimap& std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::operator= ( unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc > && )

default

Move assignment operator.

◆ operator=() [3/3]

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

unordered_multimap& std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::operator= ( initializer_list< value_type > __l )

inline

Unordered_multimap list assignment operator.

Parameters

__l	An initializer_list.

This function fills an unordered_multimap with copies of the elements in the initializer list __l.

Note that the assignment completely changes the unordered_multimap and that the resulting unordered_multimap's size is the same as the number of elements assigned.

Definition at line 1436 of file unordered_map.h.

◆ rehash()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::rehash ( size_type __n )

inline

May rehash the unordered_multimap.

Parameters

__n	The new number of buckets.

Rehash will occur only if the new number of buckets respect the unordered_multimap maximum load factor.

Definition at line 1970 of file unordered_map.h.

◆ reserve()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::reserve ( size_type __n )

inline

Prepare the unordered_multimap for a specified number of elements.

Parameters

__n	Number of elements required.

Same as rehash(ceil(n / max_load_factor())).

Definition at line 1981 of file unordered_map.h.

◆ size()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

size_type std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::size ( ) const

inlinenoexcept

Returns the size of the unordered_multimap.

Definition at line 1456 of file unordered_map.h.

◆ swap()

template<typename _Key , typename _Tp , typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>

void std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >::swap ( unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc > & __x )

inlinenoexcept

Swaps data with another unordered_multimap.

Parameters

__x	An unordered_multimap of the same element and allocator types.

This exchanges the elements between two unordered_multimap in constant time. Note that the global std::swap() function is specialized such that std::swap(m1,m2) will feed to this function.

Definition at line 1749 of file unordered_map.h.

The documentation for this class was generated from the following file:

unordered_map.h

Public Types

Public Member Functions

Friends

Detailed Description

template<typename _Key, typename _Tp, typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>> class std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >

Member Typedef Documentation

◆ allocator_type

◆ const_iterator

◆ const_local_iterator

◆ const_pointer

◆ const_reference

◆ difference_type

◆ hasher

◆ iterator

◆ key_equal

◆ key_type

◆ local_iterator

◆ mapped_type

◆ pointer

◆ reference

◆ size_type

◆ value_type

Constructor & Destructor Documentation

◆ unordered_multimap() [1/7]

◆ unordered_multimap() [2/7]

◆ unordered_multimap() [3/7]

◆ unordered_multimap() [4/7]

◆ unordered_multimap() [5/7]

◆ unordered_multimap() [6/7]

◆ unordered_multimap() [7/7]

Member Function Documentation

◆ begin() [1/4]

◆ begin() [2/4]

◆ begin() [3/4]

◆ begin() [4/4]

◆ bucket_count()

◆ cbegin() [1/2]

◆ cbegin() [2/2]

◆ cend() [1/2]

◆ cend() [2/2]

◆ clear()

◆ count()

◆ emplace()

◆ emplace_hint()

◆ empty()

◆ end() [1/4]

◆ end() [2/4]

◆ end() [3/4]

◆ end() [4/4]

◆ equal_range() [1/2]

◆ equal_range() [2/2]

◆ erase() [1/4]

◆ erase() [2/4]

◆ erase() [3/4]

◆ erase() [4/4]

◆ find() [1/2]

◆ find() [2/2]

◆ get_allocator()

◆ hash_function()

◆ insert() [1/8]

◆ insert() [2/8]

◆ insert() [3/8]

◆ insert() [4/8]

◆ insert() [5/8]

◆ insert() [6/8]

◆ insert() [7/8]

◆ insert() [8/8]

◆ key_eq()

◆ load_factor()

◆ max_bucket_count()

◆ max_load_factor() [1/2]

◆ max_load_factor() [2/2]

◆ max_size()

◆ operator=() [1/3]

◆ operator=() [2/3]

◆ operator=() [3/3]

◆ rehash()

◆ reserve()

◆ size()

◆ swap()

template<typename _Key, typename _Tp, typename _Hash = hash<_Key>, typename _Pred = equal_to<_Key>, typename _Alloc = allocator<std::pair<const _Key, _Tp>>>
class std::unordered_multimap< _Key, _Tp, _Hash, _Pred, _Alloc >