#include <iostream>
using namespace std;
class A
{
public:
    virtual void f1()
    {
        cout << "Base::f1()\n";
    }
    void usual()
    {
        cout << "usual()\n";
        f1();
        f2();
        f3();
    }
protected:
    virtual void f2()
    {
        cout << "A::f2()\n";
    }
private:
    virtual void f3()
    {
        cout << "A::f3()\n";
    }
};

class D1 : public A
{
protected:
    virtual void f1()
    {
        cout << "D1-f1()\n";
    }
public:
    virtual void f2()
    {
        cout << "D1-f2()\n";
    }
private:
    virtual void f3()
    {
        cout << "D1-f3()\n";
    }
};
int main()
{
    D1 d1;
    A* q = &d1;
    q->f1();
    return 0;
}