Return a reverse iterator to the last element, or rend if empty.
Declared in <bslstl_set.h>
set<KEY, COMPARATOR, ALLOCATOR>::reverse_iterator
rbegin() noexcept;Return a reverse iterator providing 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.
modifiable reverse iterator to the last element, or rend()