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list size() function in C++ STL

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  • Last Updated : 14 Jun, 2022

The list::size() is a built-in function in C++ STL which is used to find the number of elements present in a list container. That is, it is used to find the size of the list container. Syntax:


Time Complexity – Linear O(N)

Parameters: This function does not accept any parameter. Return Value: This function returns the number of elements present in the list container list_name. Below program illustrate the list::size() function in C++ STL: 


// CPP program to illustrate the
// list::size() function
#include <bits/stdc++.h>
using namespace std;
int main()
    // Creating a list
    list<int> demoList;
    // Add elements to the List
    // getting size of the list
    int size = demoList.size();
    cout << "The list contains " << size << " elements";
    return 0;

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