Purpose of Dummy Parameter in Postfix Operator Overload? c++

Question

When overloading the postfix operator, I can do something simple like

Class Foo
{
private: 
   int someBS;
public:
   //declaration of  pre &postfix++
           


        

Answer 1

To quote cppreference:

The int parameter is a dummy parameter used to differentiate between prefix and postfix versions of the operators.

The quote says it all, because how else would you differentiate prefix and postfix?

Let's just say that you don't need the int parameter, then the prefix (Foo operator++()) and postfix (Foo operator++()) would be exactly the same! How would the compiler know which one you meant? That's why there is this dummy int parameter.