[Qt-interest] Connecting slots to virtual objects

[Dirk Neumann]

Hello,

is there a way to connect to signals of objects which are only
accessible via a pure virtual method? The layout is the following:

class A : public QObject{
...
signals:
  void mySignal();
...
};

class A1: public A{
...
};

class A2: public A{
...
};

class B{
...
protected:
  virtual A* myA()=0;
...
};

class B1 : public B{
...
 A1* _a;
protected:
 A myA(){return _a;}
...
};

class B2: public B{
...
  A2* _a;
protected:
 A myA(){return _a;}
...
};

Now I want to connect to mySignal() inside the constructor of B. An
expression like 
>connect(myA(),SIGNAL(mySignal()),this,SLOT(onMySignal()));
inside the constructor of B results in a linker error of type
>undefined reference to `B::myA()
expressing myA()->method() compiles and links without problems.

Thanks in advance

Dirk.
-- 
Dirk Neumann - Informatik
Dipl.-Inf. Dirk Neumann
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