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

public member function

<set>

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

Return const_reverse_iterator to reverse end

Returns a const_reverse_iterator pointing to the element that would theoretically precede the first element in the container (which is considered its reverse end).

Parameters none

Return Value A const_reverse_iterator to the reverse end 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::end
Return iterator to end (public member function)
set::crbegin
Return const_reverse_iterator to reverse beginning (public member function)
set::rend
Return reverse iterator to reverse end (public member function)

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