// C++ program to illustrate the
// cbefore_begin() function
#include <bits/stdc++.h>
using namespace std;
int main()
{
// initialising the forward list
forward_list<int> fl = { 20, 30, 40, 50 };
// performing cbefore_begin function
auto it = fl.cbefore_begin();
// inserting element before the first element
fl.insert_after(it, 10);
cout << "Element of the list are:" << endl;
// loop to print the elements of the list
for (auto it = fl.begin(); it != fl.end(); ++it)
cout << *it << " ";
return 0;
}