C++ Vector Library - rend() Function

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Description

The C++ function std::vector::rend() returns a reverse iterator which points to the reverse end of the vector i.e. beginning of the vector.

Declaration

Following is the declaration for std::vector::rend() function form std::vector header.

C++98

reverse_iterator rend();
const_reverse_iterator rend() const;

C++11

reverse_iterator rend() noexcept;
const_reverse_iterator rend() const noexcept;

Parameters

None

Return value

If object is constant qualified then returns constant reverser iterator otherwise returns non-constant reverse iterator.

Exceptions

This member function never throws excpetion.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::rend() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v = {1, 2, 3, 4, 5};

   /* Iterate vector */
   for (auto it =  v.rend() - 1; it >= v.rbegin(); --it)
      cout << *it << endl;

   return 0;
}

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

1
2
3
4
5