Re: How to find out if a function is overridden

I have a base class, let's call it Base, and a number of publicly
derived classes, let's call them Derived1, Derived2 etc. although
actually we don't know what they are called, how many of them there
are and so on. This is the standard "as a" usage, so Base has virtual
functions, virtual destructor etc. Base may be abstract. However in
the case of interest base has a function, let's call it foo, that is
virtual but isn't abstract and has an implementation. Inheritance by
the Deriveds might be virtual (and might not be direct, there may be a
deeper hierarchy).

Now I have a pointer to Base that actually points to one of the
Deriveds. This Derived may or may not have overridden foo. My question
is, has it? - i.e. can I, and if so how, write some code to find out
if whichever Derived a particular Base * points to (you can assume it
points to some Derived) has implemented foo.

You have complete control of Base, so if you need some code in it to
make this work, fine. But you can't do anything to any Derived.

(And for those who say, you shouldn't have to do this, this is for
part of a test process. I don't actually want it in the real code - so
therefore although I said you can put code in Base, not too much
please.)