C++ List pop_front()

void pop_front();

#include <iostream>
#include<list>
using namespace std;
int main()
{
     list<int> li={20,30,40,50};
    li.pop_front();
    list<int>::iterator itr;
    for(itr=li.begin();itr!=li.end();++itr)
    cout<<*itr<<",";
    return 0;
}

30,40,50