virtual function declared non-virtual in a derived class

Question

If a function is declared non-virtual in a derived class when the base class function was virutal, why does it invoke a vtable lookup on calling the function on its pointer? The

Answer 1

You cannot make a function non-virtual, so it will stay virtual and a call to the function is in general also virtual. Of course, there are situations where the compiler will be able to optimize this and do a direct call, but apparantly not in your scenario.