Extending enum in derived classes

Question

I have a class hierarchy, and each class in it has an exception class, derived in a parallel hierarchy, thus...

class Base
{
};

class Derived : public Base
{
};         


        

Answer 1

You could do this, since you use unnamed enums. I suppose you use integer type to store the reason of the exception.

class DerivedException : public BaseException
{
    enum { YET_ANOTHER_REASON = THAT_REASON + 1, EVEN_MORE_REASON};
};

I wouldn't encode reasons as codes. I would prefer specialized exception classes, so I can catch only the exception types that I can handle at one moment.