member func: back

defination

reference back();
const_reference back() const;

Returns a reference to the last element in the array container.

Unlike member array::end, which returns an iterator just past this element, this function returns a direct reference.

Calling this function on an empty container causes undefined behavior.

Parameters

none

Return value

A reference to the last element in the array.

If the array object is const-qualified, the function returns a const_reference. Otherwise, it returns a reference.

Member types reference and const_reference are the reference types to the elements of the array (see array member types).

example

// array::back
#include <iostream>
#include <array>

int main ()
{
  std::array<int,3> myarray = {5, 19, 77};

  std::cout << "front is: " << myarray.front() << std::endl;   // 5
  std::cout << "back is: " << myarray.back() << std::endl;     // 77

  myarray.back() = 50;

  std::cout << "myarray now contains:";
  for ( int& x : myarray ) std::cout << ' ' << x;
  std::cout << '\n';

  return 0;
}

front is: 5
back is: 77
myarray now contains: 5 19 50