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

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.