+/**
+ * @brief This signal is emitted when an actor is hit through hit-test.
+ *
+ * A callback of the following type may be connected:
+ * @code
+ * void MyCallbackName( Actor actor );
+ * @endcode
+ * actor The actor to intercept
+ *
+ * @note This callback is called when the actor is hit.
+ * If true is returned, TouchEvent is called from the this actor.
+ * If false is returned, the hit test starts again from the next lower actor.
+ *
+ * @note example
+ * Actor topActor = Actor::New();
+ * Actor bottomActor = Actor::New();
+ * topActor.TouchedSignal().Connect(&application, topActorFunctor);
+ * bottomActor.TouchedSignal().Connect(&application, bottomActorFunctor);
+ * The two actors have no relationship.
+ * So when the topActor is touched, the event cannot be propagated to the bottomActor.
+ *
+ * If you connect HitTestResultSignal to topActor.
+ * Dali::DevelActor::HitTestResultSignal(topActor).Connect(&application, hitTestResultFunctor);
+ *
+ * If the hitTestResult Functor returns false, it passes the hit-test and starts the hit-test again from the next lower actor.
+ * So the bottomActor can be hit and receive touch events.
+ * If hitTestResult returns true, it means that it has been hit. So it receives a TouchEvent from itself.
+ *
+ * @return The signal to connect to
+ * @pre The Actor has been initialized
+ */
+DALI_CORE_API Actor::TouchEventSignalType& HitTestResultSignal(Actor actor);
+