# Observers

The following table provides additional information on the members of the `concurrent_unordered_map` and `concurrent_unordered_multimap` template classes.
Member | Description
--- | ---
`hasher hash_function() const()` | Returns: Hashing functor associated with the map.
`key_equal key_eq() const` | Returns: Key equivalence functor associated with the map.

Parent topic: concurrent_unordered_map and concurrent_unordered_multimap Template Classes