template<class A, class B, class C=void*, class D=void*>
class Tupel {
public:
	Tupel(const A& a, const B& b, const C& c = NULL, const D& d = NULL) 
		: a(a), b(b), c(c), d(d) {}
	Tupel() {}
	A a; B b; C c; D d;
};

template<class A, class B, class C=void*, class D=void*>
class Tupel {
public:
	Tupel(const A& a, const B& b, const C& c = NULL, const D& d = NULL) 
		: a(a), b(b), c(c), d(d) {}
	Tupel() {}
	union { A a, key, v1; };
	union { B b, value, v2; }; 
	union { C c, v3; };
	union { D d, v4; };
};