Return a local iterator providing non-modifiable access to the first value_type object (in the sequence of value_type objects) of the bucket having the specified index in the array of buckets maintained by this set, or the end(index) otherwise.
Declared in <bslstl_unorderedset.h>
unordered_set<KEY, HASH, EQUAL, ALLOCATOR>::const_local_iterator
begin(size_type index) const;