C / C++ / MFC

class Foo {

	virtual int func1() = 0;
	virtual int func2() = 0;
	virtual int func3() {return 0;}
};

class Goo: Foo {
public:
	virtual int func1() {return 0;}
	virtual int func2() {return 0;}
	virtual int myFunc() {return 1;}
};

class Zoo {

public:

	virtual int zoo_func() {return 0;}
};

int main()
{
	Goo g;
	Zoo z;
	return 0;
}