std::multimap count() method
- since C++14
- since C++98
// (1) Const version only
size_type count( const Key& key ) const;
// (2) Const version only
template< class K >
size_type count( const K& x ) const;
// (1) Const version only
size_type count( const Key& key ) const;
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-idCompare::is_transparent
is valid and denotes a type. They allow calling this function without constructing an instance ofKey
.
Parameters
key
- key value of the elements to countx
- 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 the elements found - O(log size() + N), where N is the number of elements found.
Exceptions
(none)
This article originates from this CppReference page. It was likely altered for improvements or editors' preference. Click "Edit this page" to see all changes made to this document.
Hover to see the original license.
Hover to see the original license.