#include <iostream>
#include <thread>
#include <variant>
#include <functional>

using namespace std ;

struct Calculator
{
    // A simple member function
    int add( int x1 , int x2 )
    {
        return x1 + x2  ;
    }
};





int main()
{

    Calculator obj1{}; // Initialize struct with value = 10

    // Call the member function directly using std::invoke
    int result1 = std::invoke(   &Calculator::add, obj1, 5 , 6  );
    std::cout << "Result with object: " << result1 << '\n'; // Outputs 15





	return 1 ;
}