Postfix operator

If we have an object x of a class XClass and we need both statements x++ and ++x be properly executed, we need to overload bot postfix and prefix perators. For example as it is in the following program:

#include <iostream>
using namespace std;

class Test
{
    int x;
public:
    Test() : x(0) {}

    Test operator++()
    {
        x++;
        return *this;
    }

    Test operator++(int)
    {
        x++;
        return *this;
    }

    int X() { return x; }

    void Out() 
    {
        cout << "x = " << x << endl;
    }
};

int main()
{
    Test test;
    test.Out();

    ++test;
    test.Out();

    test++;
    test.Out();
    
    return 0;
}

As you see the postfix operator has int in parentheses. It is a signal to the compiler to generate the postfix version of the operator.