- std::map<const Object *, std::set<const ObjectInstance *> > objects;
- std::set<const Renderable *> renderables;
+ typedef std::set<const ObjectInstance *> InstanceSet;
+ typedef std::map<const Object *, InstanceSet> ObjectMap;
+ typedef std::set<const Renderable *> RenderableSet;
+
+ ObjectMap objects;
+ RenderableSet renderables;