Return a pair of iterators providing modifiable access to the sequence of value_type objects in this unordered set that are equivalent to the specified key, where the first iterator is positioned at the start of the sequence, and the second is positioned one past the end of the sequence. If this unordered set contains no value_type objects equivalent to key, then the two returned iterators will have the same value. Note that since an unordered set maintains unique keys, the range will contain at most one element.
Declared in <bslstl_unorderedset.h>
pair<iterator, iterator>
equal_range(key_type const& key);