Deriving a class from an abstract class (C++)

Question

I have an abstract class with a pure virtual function f() and i want to create a class inherited from that class, and also override function f(). I seperated the header file and the cpp file. I declared the function f(int) in the header file and the definition is in the cpp file. However, the compiler says the derived class is still abstract. How can i fix it?

Answer 1

The functions f() and f(int) do not have the same signature, so the second would not provide an implementation for the first. The signatures of the PVF and the implementation must match exactly.