dreaded diamond with a twist: granddad has no members, but has a method.

fun_diamond.cpp

#include <iostream>

struct granddad {
	void helloes() {
		std::cout << "helloes" << std::endl;
	}
};

struct dad : public granddad {
	int a;
};

struct mom : public granddad {
	int b;
};

struct freak: public mom, public dad {};


int main() {
	freak f;
 	//f.helloes();
/*
  produces error:

inheri.cpp: In function ‘int main()’:
inheri.cpp:83: error: request for member ‘helloes’ is ambiguous
inheri.cpp:54: error: candidates are: void granddad::helloes()
inheri.cpp:54: error:                 void granddad::helloes()

(heh)
*/

	f.mom::helloes(); // works!
	return 0;
}