# std::unordered_multimap::count

 size_type count( const Key& key ) const; (1) (since C++11)

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

## Contents

### Parameters

 key - key value of the elements to count

### Return value

Number of elements with key key.

### Complexity

linear in the number of elements with key key on average, worst case linear in the size of the container.