enum-int casting: operator or function

Question

In the external code that I am using there is enum:

enum En {VALUE_A, VALUE_B, VALUE_C};

In another external code that I am using there ar

Answer 1

You can not overload operators for enums. Or am I missing something? Well, you could create some sort of dummy classes, that would have an implicit constructor taking an int, and then have a cast operator to an enum (and vice versa).

So, the only solution is to have functions. Also, I would make the overloads as Patrick suggests.