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?):

class A { public:     A& operator++(int n)     {         std::cout<<"N is:"<<n<<"\n";         return *this;     } };   int main() {        A a;     a++;     a.operator ++(10); } 

On VS2008, I get the output as:

N is 0

for first call and

N is 10

for second call

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.