I have a diamond multiple inheritance scenario like this:

    A
  /   \
 B     C
  \   /
    D

The common parent, A, defines a virtual function fn().
Is it possible for both B and C to define fn()?
If it is, then the next question is - can D access both B and C's fn() without disambiguation? I'm assuming there is some syntax for this..
And is it possible for D to do that without knowing specifically who are B and C? B and C can be replaces by some other classes and I want the code in D to be generic.

What I'm trying to do is to have D somehow enumerate all of the instances of fn() it has in its ancestry. Is this possible in some other means that virtual functions?

c++ multiple-inheritance virtual-functions diamond-problem
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