Unsolved Is it possible a derived class object can emit a signal base class

[Qt Enthusiast]

Hi All
I have a base class

  class A {
      Q_Object:
   public:
     signals
        updateUndoRedoActionDone(bool);

  

};

class B : public A {
    
   public :
      void task:

};

void B::task() {
    connect::(this , updateUndoRedoActionDone,otherObject, udateUndoRedoInPhysicalView);

}

void B::signal() {

   emit updateUndoRedoActionDone(false);
}

The derived object has not has Q_object

[jsulm]

@Qt-Enthusiast Sure it is possible, but B needs Q_OBJECT.