Is it allowed to name the parameter in postfix operator ++?

Question

I am not using this code in any production environment, it is just for my understanding. Is this code valid (i.e. can I define my postfix operator like this?):

Answer 1

Yes, it is valid the int as a parameter it only a policy enforcing parameter to distinguish between prefix and postfix operators. The passed parameter will be received as an argument, which is the behavior you see & it is prfectly defined behavior.

Answer 2

a++ is equivalent to a.operator++(0);. Your code is valid

13.5/7

When the postfix increment is called as a result of using the ++ operator, the int argument will have value zero.

Answer 3

This behavior is legal and well defined in 13.5.7:

Calling operator++ explicitly, as in expressions like a.operator++(2), has no special properties: The argument to operator++ is 2.