C++ <array> - rend() Function

The C++ array::rend function returns the reverse iterator pointing to the element preceding the first element (reversed past-the-last element) of the array. A reverse iterator iterates in backward direction and increasing it results into moving to the beginning of the array container. Similarly, decreasing a reverse iterator results into moving to the end of the array container.

Syntax

C++11

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

Parameters

No parameter is required.

Return Value

A reverse iterator to the reversed past-the-last element of the sequence container. If the sequence object is constant qualified, the function returns a const_reverse_iterator, else returns an reverse_iterator.

Time Complexity

Constant i.e, Θ(1).

Example:

In the example below, the array::rend function returns the reverse iterator pointing to the element preceding the first element of the array MyArray.

#include <iostream>
#include <array>
using namespace std;
 
int main (){
  array<string, 3> MyArray{"Alpha","Coding","Skills"};
  array<string, 3>::reverse_iterator rit;

  rit = MyArray.rend();
  rit--;
  cout<<*rit<<" ";
  rit--;
  cout<<*rit<<" ";
  rit--;
  cout<<*rit<<" ";
  return 0;
}

The output of the above code will be:

Alpha Coding Skills

Example:

Lets see another example where the array called MyArray contains integer values and array::rend function is used with array::rbegin function to specify a range including all elements of the array container.

#include <iostream>
#include <array>
using namespace std;
 
int main (){
  array<int, 5> MyArray{10, 20, 30, 40, 50};
  array<int, 5>::reverse_iterator rit;

  for(rit = MyArray.rbegin(); rit != MyArray.rend(); ++rit)
    cout<<*rit<<" ";

  return 0;
}

The output of the above code will be:

50 40 30 20 10

❮ C++ <array> Library