C++ Array::cend() Function

The C++ std::array::cend() function is used to return a constant iterator pointing to the element following the last element of the array. This function is used when you need a read only iterator that cannot modify the elements it points to.

Syntax

Following is the syntax for std::array::cend() function.

const_iterator cend() const noexcept;

Parameters

It does not accepts any parameter.

Return Value

This function returns a constant iterator pointing to the past-end element of the array.

Exceptions

This function never throws exception.

Time complexity

Constant i.e. O(1)

Example 1

Let's look at the following example, where we are going to use the cend() function on the integers array.

#include 
#include 
using namespace std;
int main() {
   array < int, 8 > MyArray {1,2,3,4,5,6,7,8};
   array < int, 8 > ::const_iterator cit;
   for (cit = MyArray.cbegin(); cit != MyArray.cend(); ++cit)
      cout << * cit << " ";
   return 0;
}

Output

Output of the above code is as follows −

1 2 3 4 5 6 7 8

Example 2

Consider the following example, where we are going to modify the value and observing the output.

#include 
#include 
using namespace std;
int main(void) {
   array < int, 5 > arr = {10,20,30,40,50};
   auto it = arr.cend();
   * it = 5;
   return 0;
}

Output

Following is the output of the above code −

main.cpp: In function 'int main()':
main.cpp:8:8: error: assignment of read-only location '* it'
    8 |    *it = 5;
      |    ~~~~^~~