Return an iterator providing non-modifiable access to the value_type object in this unordered set that is equivalent to the specified key, if such an entry exists, and the past-the-end (end) iterator otherwise.
Declared in <bslstl_unorderedset.h>
unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::const_iterator
find(key_type const& key) const;