size_type count( const Key& key ) const; | (1) | (since C++11) |
Returns the number of elements with key key.
Parameters
| key | - | key value of the elements to count |
Return value
Number of elements with key key.
Complexity
Constant on average, worst case linear in the size of the container.
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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