Lookup

All methods in this section can be executed concurrently with each other and concurrently-safe modifiers.

find

bool find( const_accessor& result, const key_type& key ) const;

bool find( accessor& result, const key_type& key );

If the accessor result is not empty, releases the result.

If an element with the key that is equivalent to key exists, sets the result to provide access to this element.

Returns: true if an element with the key equivalent to key is found; false, otherwise.

count

size_type count( const key_type& key ) const;

Returns: 1 if an element with the equivalent to key exists; 0, otherwise.