std::multiset<Key,Compare,Allocator>:: count

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C++
Containers library
std::multiset
Member functions
Non-member functions
Deduction guides (C++17)
size_type count ( const Key & key ) const ;
(1)
template < class K >
size_type count ( const K & x ) const ;
(2) (since C++14)

Returns the number of elements with key that compares equivalent to the specified argument.

1) Returns the number of elements with key key .
2) Returns the number of elements with key that compares equivalent to the value x . This overload participates in overload resolution only if the qualified-id Compare :: is_transparent is valid and denotes a type. It allows calling this function without constructing an instance of Key .

Parameters

key - key value of the elements to count
x - alternative value to compare to the keys

Return value

Number of elements with key that compares equivalent to key or x .

Complexity

Logarithmic in the size of the container plus linear in the number of elements found.

Notes

Feature-test macro Value Std Feature
__cpp_lib_generic_associative_lookup 201304L (C++14) Heterogeneous comparison lookup in associative containers ; overload (2)

Example

This section is incomplete
Reason: no example

See also

finds element with specific key
(public member function)
returns range of elements matching a specific key
(public member function)
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