Return a local iterator providing 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.
value_type
index
end(index)
Declared in <bslstl_unorderedset.h>
<bslstl_unorderedset.h>
local_iterator begin(size_type index);