functors in c 2b 2b

1class Solution
2{
3  public : 
4  	int operator()(int n)  // overloading the operator ()
5    {
6        return n*n; 
7    }
8};
9int main()
10{
11  Solution solve; // making an function object
12  cout<<solve(3)<<"\n"; // passing three as a parameter in the function object
13  
14}
15// output ->  9