C++ Deque empty

C++ Deque empty function checks whether the container is empty or not. If the container is empty, it returns 1 otherwise 0.

Syntax

void empty()

Parameter

It does not contain any parameter.

Return value

It does not return any value.

Example 1

Let's see a simple example when deque is not empty.

#include <iostream>
#include<deque>
using namespace std;
int main()
{
    deque<int> first={5,6,7};
    if(first.empty())
    cout<<"Deque is empty";
    else
    cout<<"Deque is not empty";
    return 0;
}

Output:

Deque is not empty

In this example, empty function determines that the deque is not empty. Therefore, it returns false.

Example 2

Let's see a simple example when deque is empty.

#include <iostream>
#include<deque>
using namespace std;
int main()
{
    deque<int> d;
    if(d.empty())
    cout<<"Deque is empty";
    else
    cout<<"Deque is not empty";
    return 0;
}

Output:

Deque is empty

In this example, empty function determines that the deque is empty. Therefore, it returns true.