list empty() function in C++ STL

Last Updated : 29 May, 2023

The list::empty() is a built-in function in C++ STL that is used to check whether a particular list container is empty or not. This function does not modify the list, it simply checks whether a list is empty or not, i.e. the size of the list is zero or not.

Syntax

list_name.empty()

Parameters

This function does not accept any parameter, it simply checks whether a list container is empty or not.

Return Value

The return type of this function is boolean.
It returns True is the size of the list container is zero otherwise it returns False.

Example

The below program illustrates the list::empty() function.

C++

// CPP program to illustrate the
// list::empty() function
#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Creating a list
    list<int> demoList;

    // check if list is empty
    if (demoList.empty())
        cout << "Empty List\n";
    else
        cout << "Not Empty\n";

    // Add elements to the List
    demoList.push_back(10);
    demoList.push_back(20);
    demoList.push_back(30);
    demoList.push_back(40);

    // check again if list is empty
    if (demoList.empty())
        cout << "Empty List\n";
    else
        cout << "Not Empty\n";

    return 0;
}

Output

Empty List
Not Empty

Time Complexity: O(1)
Space Complexity: O(1)

Note: This function works in constant time complexity.

list front() function in C++ STL

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