7.1 vs 8.0: Inheritance and Events

From:
rwf_20 <rfrenz@gmail.com>
Newsgroups:
microsoft.public.vc.language
Date:
18 Apr 2007 06:30:27 -0700
Message-ID:
<1176903027.864337.173680@y5g2000hsa.googlegroups.com>
Consider the following (/clr:oldSyntax):

// myPanel.h
public __gc class myPanel {
public:
  __delegate void PanelActivationHandler();
  __event PanelActivationHandler* PanelActivated;

 virtual void OnPanelActivated() {
   std::cerr << "myPanel::OnPanelActivated()\n";
 }
};

public __gc class derivedPanel : public myPanel {
public:
  virtual void OnPanelActivated() {
     std::cerr << "derivedPanel::OnPanelActivated()\n";
  }

  void generateEvent() {
    PanelActivated();
  }
};
// end myPanel.h

// test.cpp
int main() {
  derivedPanel* p = new derivedPanel();

  p->add_PanelActivated(new myPanel::PanelActivationHandler(p,
&myPanel::OnPanelActivated));

  p->generateEvent();

  return 0;
}
// end test.cpp

In VisualStudio 2003, this code calls the base class event handler:
"myPanel::OnPanelActivated()"

In VisualStudio 2005, this code calls the derived class event handler:
"derivedPanel::OnPanelActivated()"

So, my questions are:
Which one should be called? I would think that the 2005 behavior is
correct; however, the static scoping of the function pointer
(&myPanel::OnPanelActivated) concerns me.

Is there a way to make this work in both versions? Keep in mind that,
in my real application, the code calling add_PanelActivated knows only
the base type.

Thanks in advance,
Ryan

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