void MyFunc(int i, int i1, int i2)
{
    ...
}

void main()
{
    PostCallback(callback(MyFunc, 1, 2, 3)); // ?????
}

PostCallback(callback3(MyFunc, 1, 2, 3)); // ?????

struct int3
{
	int3(int _a, int _b, int _c) : a(_a), b(_b), c(_c) { }
	int a, b, c;
};

void MyFunc(int3 i)
{
    ...
}

void main()
{
    PostCallback(callback1(MyFunc, int3(1, 2, 3))); // ?????
}

template <class OBJECT_, class METHOD_, class T1, class T2, class T3>
struct CallbackMethodActionArg3Pte : public CallbackAction {
	Ptr<OBJECT_>  object;
	METHOD_       method;
	T1            arg1;
	T2            arg2;
	T3            arg3;
	void    Execute() { if(object) (object->*method)(arg1, arg2, arg3); }

	CallbackMethodActionArg3Pte(OBJECT_ *object, METHOD_ method, T1 arg1, T2 arg2, T3 arg3)
	: object(object), method(method), arg1(arg1), arg2(arg2), arg3(arg3) {}
};

template <class Object, class R, class O, class A, class B,class C, class T1, class T2, class T3>
Callback pteback3(Object *object, R (O::*method)(A, B, C), T1 arg1, T2 arg2, T3 arg3) {
	return Callback(new CallbackMethodActionArg3Pte<Object, R (O::*)(A,B,C), T1, T2, T3>
	                    (object, method, arg1, arg2, arg3));
}

template <class OBJECT_, class METHOD_, class T1, class T2, class T3>
struct CallbackMethodActionArg3 : public CallbackAction 
{
	OBJECT_  *object;
	METHOD_   method;
	T1        arg1;
	T2        arg2;
	T3        arg3;
	
	void    Execute() { (object->*method)(arg1, arg2, arg3); }

	CallbackMethodActionArg3(OBJECT_ *object, METHOD_ method, T1 arg1, T2 arg2, T3 arg3)
	: object(object), method(method), arg1(arg1), arg2(arg2), arg3(arg3) {}
};

template <class Object, class R, class O, class A, class B, class C, class T1, class T2, class T3> 
Callback callback3(Object *object, R (O::*method)(A, B, C), T1 arg1, T2 arg2, T3 arg3) 
{
	return Callback(
		new CallbackMethodActionArg3<Object, R (O::*)(A, B, C), T1, T2, T3>(object, method, arg1, arg2, arg3));
}

template <class Object, class R, class O, class A, class B, class C, class T1, class T2, class T3> 
Callback callback3(const Object *object, R (O::*method)(A, B, C) const, T1 arg1, T2 arg2, T3 arg3) {
	return Callback(new CallbackMethodActionArg4<Object, R (O::*)(A, B, C) const, T1, T2, T3>
	                    (object, method, arg1, arg2, arg3));
}

template <class X, class T1, class T2, class T3, class HC = X>
struct CallbackActionCallArg3 : public CallbackAction {
	X         x;
	T1        arg1;
	T2        arg2;
	T3        arg3;
	void    Execute() { x(arg1, arg2, arg3); }

	CallbackActionCallArg3(X x, T1 arg1, T2 arg2, T3 arg3) 
		: x(x), arg1(arg1), arg2(arg2), arg3(arg3) {}
};

template <class R, class A, class B, class C, class T1, class T2, class T3>
Callback callback3(R (*fn)(A, B, C), T1 arg1, T2 arg2, T3 arg3) {
	return Callback(
		new CallbackActionCallArg3<R (*)(A, B, C), T1, T2, T3, uintptr_t>(fn, arg1, arg2, arg3));
}

template <class A, class B, class C, class T1, class T2, class T3>
Callback callback3(Callback3<A, B, C> cb, T1 arg1, T2 arg2, T3 arg3) {
	return Callback(
		new CallbackActionCallArg3<Callback4<A, B,C,D>, T1, T2, T3>(cb, arg1, arg2, arg3));
}