is_enum implementation

Question

I\'m trying to implement std::is_enum. Here is my code so far:

template
struct is_enum {
    static bool value;
};

template

        

Answer 1

This

template

promises that the template argument is a value of type enum E. The argument is NOT a type (Type template arguments are introduced by typename, or for backward compatibility, class. Even struct isn't allowed). It's just like saying

template

except no name is given for the variable.

Things go wrong from there.