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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_deque_crend.htm below:

C++ Deque Library - crend() Function

The C++ function std::deque::crend() returns a constant reverse iterator which points to the theoretical element preceding the first element in the deque i.e. reverse end of deque.

Following is the declaration for std::deque::crend() function form std::deque header.

const_reverse_iterator crend() const noexcept;

None

Returns a constant random reverse iterator which points to the reverser end of deque.

This member function never throws exception.

Constant i.e. O(1)

The following example shows the usage of std::deque::crend() function.

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d = {1, 2, 3, 4, 5};

   cout << "Contents of deque are" << endl;

   for (auto it = d.crend() - 1; it >= d.crbegin(); --it)
      cout << *it << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Contents of deque are
1
2
3
4
5

deque.htm

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