tuples.m

typedef id (^Tuple)(size_t);

#define tuple(...) \
	tupleMake(__VA_ARGS__, nil)

#define emptyTuple \
	tupleMake(nil)

Tuple tupleMake (id firstObject, ...) NS_REQUIRES_NIL_TERMINATION
{
	if (!firstObject) {
		Tuple t = ^ id (size_t n){
			return nil;
		};

		return [[t copy] autorelease];
	}

	// blah blah get varargs here
	size_t numberOfObjects;
	id objects[numberOfObjects];

	Tuple t = ^ id (size_t n){
		if (n < numberOfObjects)
			return objects[n];
		else
			return nil;
	};

	return [[t copy] autorelease];
}

// usage
Tuple t = tuple(@"foo", [NSNumber numberWithInt:1]);
NSString *str = t(0);
NSNumber *num = t(1);