Can I override a virtual function with a pure virtual one?

Question

I have three classes: B, D and G. D is a B and G is a D. Both B and

Answer 1

You asked:

Can I override a virtual function with a pure virtual one?

The answer is: Yes, you can. From the C++11 standard:

10.4 Abstract classes

5 [ Note: An abstract class can be derived from a class that is not abstract, and a pure virtual function may override a virtual function which is not pure. —end note ]