Question

I have two classes:

class A {
    int get();
    string str();
}

string A::str() {
    return string_with( get() );
}

class B : public A{
    int get();
}

if I do:

A a
B b
b.str()

b will invoke A::str() (good) and it ill use A::get() method (bad!). I want, that when I invoke b.str(), the B::get() is used by str.

How to make it work?

Answer 1

Just make it virtual. That’s exactly what virtual is for.

Write

virtual int get();

in A’s definition. And, just to make the code more understandable, do the same in B’s.

By the way, I’m assuming that you meant to write class B : public A.