Return an iterator providing modifiable access to the first value_type object in the sequence of all the value elements of this unordered multiset equivalent to the specified key, if such entries exist, and the past-the-end (end) iterator otherwise.
Declared in <bslstl_unorderedmultiset.h>
unordered_multiset<KEY, HASH, EQUAL, ALLOCATOR>::iterator
find(key_type const& key);