cannot call base class protected functions?

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Protected member functions can only be called inside the base class or in its derived class. You cannot call them outside your class. Outside calling means calling a member function of a class-typed variable.

So

virtual f1(B*b) { return f2(b); }

is ok, because f2 operates on the class itself. (called inside)

But

virtual f2(B*b) { return b->f2(this); }

won’t compile, because f2 operates on b not the class D itself. (called outside) It’s illegal.

To fix it B::f2 should be public.

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