class D{}; class A : public D{}; class B : public A {}; class C : public A {};

class Base {
public:
    virtual void F1(A *p) { printf("Base A!\n"); }
    virtual void F1(B *p) { printf("Base B!\n"); }
    virtual void F1(C *p) { printf("Base C!\n"); }
    virtual void F1(D *p) { printf("Base D!\n"); }
};

class Child : public Base {
public:
    void F1(A *p) { printf("Child A!\n"); }
    void F1(B *p) { printf("Child B!\n"); }
    void F1(C *p) { printf("Child C!\n"); }
    //void F1(D *p) { printf("Child D!\n"); }
};

void main()
{
    Child c;
    D b;
    c.F1(&b);
    getch();
}