C++ function overriding

Question

I have three different base classes:

class BaseA
{
public:
    virtual int foo() = 0;
};

class BaseB
{
public:
    virtual int foo() { return 42; }
};

clas         


        

Answer 1

The important rule to remember is once a function is declared virtual, functions with matching signatures in the derived classes are always virtual. So, it is overridden for Child of A and Child of B, which would behave identically (with the exception of you can't directly instantiate BaseA).

With C, however, the function isn't overridden, but overloaded. In that situation, only the static type matters: it will call it on what it is a pointer to (the static type) instead of what the object really is (the dynamic type)