#include <iostream>
#include <cstdlib>
using namespace std;

class base {
public:
	base() {f();}            //always calls base::f
	virtual ~base() {f();}   //always calls base::f

	virtual void f() const {cout << "base::f\n";}
	void g() const {f();}    //doesn't necessarily call base::f
};

class derived: public base {
public:
	derived(): base() {f();} //always calls derived::f
	~derived() {f();}        //always calls derived::f

	void f() const {cout << "derived::f\n";}
};

int main()
{
	base b;
	b.g();

	derived d;
	d.g();

	return EXIT_SUCCESS;
}