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

public member function

<set>

std::set::crbegin 
const_reverse_iterator crbegin() const noexcept;

Return const_reverse_iterator to reverse beginning

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

Parameters none

Return Value A const_reverse_iterator to the reverse beginning of the sequence.

Member type const_reverse_iterator is a bidirectional iterator type that points to a const element.



Example 
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// set::crbegin/crend
#include <iostream>
#include <set>

int main ()
{
  std::set<int> myset = {50,20,60,10,25};

  std::cout << "myset backwards:";
  for (auto rit=myset.crbegin(); rit != myset.crend(); ++rit)
    std::cout << ' ' << *rit;

  std::cout << '\n';

  return 0;
}

Output: 
myset backwards: 60 50 25 20 10


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
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::begin
Return iterator to beginning (public member function)
set::crend
Return const_reverse_iterator to reverse end (public member function)
set::rbegin
Return reverse iterator to reverse beginning (public member function)

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