+ /*!
+ * \brief Object notified on change of base objects and
+ * notifying dependent objects in its turn.
+ * This interface is used to track the following dependencies:
+ * - GroupOnFiler depending on Filter predicates
+ * - Filter depending on a Group via FT_BelongToMeshGroup predicate
+ */
+ struct NotifyerAndWaiter
+ {
+ virtual void OnBaseObjModified(NotifyerAndWaiter* obj, bool removed) {};
+ // specific reaction on modification of a base object
+
+ void Modified( bool removed=false, NotifyerAndWaiter* who = 0);
+ // calls OnBaseObjModified(), if who != 0, and myWaiters[i]->Modified(who)
+
+ void AddModifWaiter ( NotifyerAndWaiter* waiter ); // adds a dependent object to notify
+ void RemoveModifWaiter ( NotifyerAndWaiter* waiter ); // CALL IT when a waiter dies!!!
+ bool ContainModifWaiter( NotifyerAndWaiter* waiter );
+ std::list<NotifyerAndWaiter*> myWaiters;
+ };