Return (a copy of) the hash unary functor used by this set to generate a hash value (of type size_t) for a key_type object.
size_t
key_type
Declared in <bslstl_unorderedset.h>
<bslstl_unorderedset.h>
unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::hasher hash_function() const;