#include <iostream>
using namespace std;
 
    class IntRef {
        int *ptr;
        int copy;
    public:
        IntRef(int& d) : ptr(&d) {}
        IntRef& operator=(const int& rhs) {
            // Detach from the original on assignment
            copy = rhs;
            ptr = &copy;
        }
        operator int() const {
            return *ptr;
        }
    };
 
int main() {
    int x = 5;   //Original variable
    IntRef y(x); //Reference variable to x.
    x = 5;      //Modifying original variable.
    cout<<x<<" "<<y<<endl;
    y = 10;      //Modifying reference variable.
    cout<<x<<" "<<y<<endl;
    return 0;
}

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