Chunk_object_list *get_objects(Game_object *obj) { return get_objects(obj->get_cx(), obj->get_cy()); }
Chunk_object_list *get_objects(int cx, int cy) { Chunk_object_list *list = objects[cx][cy]; if (!list) list = objects[cx][cy] = new Chunk_object_list(cx, cy); return (list); }
	Chunk_object_list *get_objects(Game_object *obj)		{ return get_objects(obj->get_cx(), obj->get_cy()); }