Overrides Across Two Levels

1#include <iostream>
2using namespace std;
3 
4class A {
5public:
6    virtual void f() const { cout << "A::f" << endl; }
7    virtual void g() const { cout << "A::g" << endl; }
8    void h() const { cout << "A::h" << endl; }
9    virtual ~A() {}
10};
11 
12class B : public A {
13public:
14    void f() const override { cout << "B::f" << endl; }
15};
16 
17class C : public B {
18public:
19    void g() const override { cout << "C::g" << endl; }
20    void h() const { cout << "C::h" << endl; }
21};
22 
23int main() {
24    C c;
25    A* a = &c;
26    B* b = &c;
27 
28    a->f(); a->g(); a->h();
29    b->f(); b->g(); b->h();
30    c.f();  c.g();  c.h();
31    return 0;
32}