Overloading an operator means overriding its functionalities so it can work with, e.g., our class's objects. Remember that we cannot simply display class instances with cout because the << operator is not defined for them. To display them, we would have to overload this operator. The example below shows how to overload the == operator so it can compare class instances.

#include <iostream>
using namespace std;

class Comparison {
    int x, y;
    public:
        Comparison(int x, int y) {
            this -> x = x;
            this -> y = y;
        }
        ~Comparison(){}
        
        int operator==(Comparison obj) {
            if (this -> x == x && this -> y == y)
                return 1;
            return 0;
        }
};

int main() {
    Comparison x(10, 20);
    Comparison y(10, 20);
    
    if (x == y)
        cout << "a and b are the same" << endl;
    
    return 0;
}