MyTestClass* ptr = new MyTestClass();    // FALSCH
ptr->doSomething();
connect(ptr,
       SIGNAL(somethingHappened()),
       this,
       SLOT(doWork()));

MyTestClass* ptr = new MyTestClass();    // RICHTIG
connect(ptr,
       SIGNAL(somethingHappened()),
       this,
       SLOT(doWork()));
ptr->doSomething();