C++ Deque Library - crbegin() Function

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Description

The C++ function std::deque::crbegin() returns a constant reverse iterator which points to the last element of the deque i.e reverser beginning of container.

Declaration

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

C++11

const_reverse_iterator crbegin() const noexcept;

Parameters

None

Return value

Returns a random access reverse iterator which points to the reverse beginning of the deque.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

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

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

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

   cout << "Contents of deque in reverse order" << endl;

   for (auto it = d.crbegin(); it != d.crend(); ++it)
      cout << *it << endl;

   return 0;
}

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

Contents of deque in reverse order
5
4
3
2
1