Return a const reverse iterator to the last element, or rend.
Declared in <bslstl_set.h>
set<KEY, COMPARATOR, ALLOCATOR>::const_reverse_iterator
rbegin() const noexcept;Return a reverse iterator providing non-modifiable access to the last value_type object in the ordered sequence of value_type objects maintained by this set, or rend if this object is empty.
const reverse iterator to the last element, or rend()