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Showing content from https://cplusplus.com/reference/set/set/rbegin/ below:

public member function

<set>

std::set::rbegin 
      reverse_iterator rbegin();const_reverse_iterator rbegin() const;
      reverse_iterator rbegin() noexcept;const_reverse_iterator rbegin() const noexcept;

Return reverse iterator to reverse beginning

Returns a reverse iterator pointing to the last element in the container (i.e., its reverse beginning).

Reverse iterators iterate backwards: increasing them moves them towards the beginning of the container.

rbegin points to the element preceding the one that would be pointed to by member end.



Parameters none

Return Value A reverse iterator to the reverse beginning of the sequence container.

If the set object is const-qualified, the function returns a const_reverse_iterator. Otherwise, it returns a reverse_iterator.

Member types reverse_iterator and const_reverse_iterator are reverse bidirectional iterator types pointing to elements. See set member types.



Example 
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// set::rbegin/rend
#include <iostream>
#include <set>

int main ()
{
  int myints[] = {21,64,17,78,49};
  std::set<int> myset (myints,myints+5);

  std::set<int>::reverse_iterator rit;

  std::cout << "myset contains:";
  for (rit=myset.rbegin(); rit != myset.rend(); ++rit)
    std::cout << ' ' << *rit;

  std::cout << '\n';

  return 0;
}

Output: 
myset contains: 78 64 49 21 17


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed (neither the const nor the non-const versions modify the container).
Concurrently accessing the elements of a set is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
set::rend
Return reverse iterator to reverse end (public member function)
set::begin
Return iterator to beginning (public member function)
set::end
Return iterator to end (public member function)

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