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

class Base {
public:
    virtual void F1(A *p);
    virtual void F1(B *p);
    virtual void F1(C *p);
    virtual void F1(D *p);
};

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

void main()
{
    Child c;
    getch();
}