std::unordered_multiset<Key,Hash,KeyEqual,Allocator>::bucket

 

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std::unordered_multiset

Member types
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unordered_multiset::unordered_multiset unordered_multiset::~unordered_multiset    unordered_multiset::operator= unordered_multiset::get_allocator Iterators unordered_multiset::beginunordered_multiset::cbegin unordered_multiset::endunordered_multiset::cend Capacity unordered_multiset::size unordered_multiset::max_size unordered_multiset::empty Modifiers unordered_multiset::clear unordered_multiset::insert unordered_multiset::insert_range (C++23) unordered_multiset::emplace unordered_multiset::emplace_hint unordered_multiset::erase unordered_multiset::swap unordered_multiset::extract (C++17) unordered_multiset::merge (C++17)	Lookup unordered_multiset::count unordered_multiset::find unordered_multiset::contains (C++20) unordered_multiset::equal_range Bucket interface unordered_multiset::begin(size_type)unordered_multiset::cbegin(size_type) unordered_multiset::end(size_type)unordered_multiset::cend(size_type) unordered_multiset::bucket_count unordered_multiset::max_bucket_count unordered_multiset::bucket_size unordered_multiset::bucket Hash policy unordered_multiset::load_factor unordered_multiset::max_load_factor unordered_multiset::rehash unordered_multiset::reserve Observers unordered_multiset::hash_function unordered_multiset::key_eq
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operator==operator!= (until C++20)	std::swap(std::unordered_multiset) erase_if(std::unordered_multiset) (C++20)
Deduction guides (C++17)

 

size_type bucket( const Key& key ) const;	(1)	(since C++11)
template< typename K > size_type bucket( const K& x ) const;	(2)	(since C++26)

1) Returns the index of the bucket for key key. Elements (if any) with keys equivalent to key are always found in this bucket.

2) Returns the index of the bucket for key that compares equivalent to the value x. Elements (if any) with keys that compare equivalent to x are always found in this bucket. This overload participates in overload resolution only if Hash::is_transparent and KeyEqual::is_transparent are valid and each denotes a type. This assumes that such Hash is callable with both K and Key type, and that the KeyEqual is transparent, which, together, allows calling this function without constructing an instance of Key.

The returned value is valid only for instances of the container for which bucket_count() returns the same value (e.g., rehash() invalidates previously obtained value).

The behavior is undefined if bucket_count() is zero.

Parameters

key	-	the value of the key to examine
x	-	a value of any type that can be transparently compared with a key

Return value

Bucket index for the requested key.

Complexity

Constant.

Notes

Feature-test macro	Value	Std	Feature
__cpp_lib_associative_heterogeneous_insertion	202311L	(C++26)	Heterogeneous overloads for the remaining member functions in ordered and unordered associative containers. (2)

See also

bucket_size

returns the number of elements in specific bucket (public member function)