C++ <array> - empty() Function

The C++ array::empty function is used to check whether the array is empty or not. It returns true if the size of the array is zero, else returns false.

Syntax

C++11

bool empty() const noexcept;

Parameters

No parameter is required.

Return Value

true if the size of the array is zero, else returns false.

Time Complexity

Constant i.e, Θ(1).

Example:

In the example below, the array::empty function is used to check whether the array is empty or not.

#include <iostream>
#include <array>
using namespace std;
 
int main (){
  array<int, 3> MyArray;

  cout<<boolalpha;
  
  cout<<"Is the Array empty?: "<<MyArray.empty()<<"\n";

  cout<<"Add elements in the Array.\n";
  MyArray[0] = 10;
  MyArray[1] = 20;
  MyArray[2] = 30;

  cout<<"Now, Is the Array empty?: "<<MyArray.empty()<<"\n";
  return 0;
}

The output of the above code will be:

Is the Array empty?: false
Add elements in the Array.
Now, Is the Array empty?: false

❮ C++ <array> Library