What to do when a class doesn’t need to override a method inherited from multiple bases?

I m learning inheritance using C++.If I have a class A , and I have inherited class B and C from A, further I have derived class D from B and C (classical diamond problem). If I have a virtual function print() in A , I overloaded it in B and C, but not in D. Now, if I have an object of class D and I call print(), it would be an error. Is there any useful way to avoid this error?

Solution

You override the method in D, even if it is just to forward to one (or both) of the B and C overrides. (You have to do this even if you never call print on an expression whose static type is D, since an A* elsewhere could point to a D.)

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