#include <iostream>

class Iface 
{
public:
	virtual void foo() { std::cout << "Iface" << std::endl; } 
};

class D : public virtual Iface
{
public:
	void foo() { std::cout << "D" << std::endl; } 
};

int
main()
{
	D d;

	d.foo();
	((Iface)d).foo();

	return 0;
}