size_type count( const Key& key ) const; | (1) | |
template< class K > size_type count( const K& x ) const; | (2) | (since C++14) |
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 only participates in overload resolution if the qualified-id Compare::is_transparent
is valid and denotes a type. They allow 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 key
.
Complexity
Logarithmic in the size of the container plus linear in the number of the elements found.
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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