[C++-sig] virtual overrides and custom smart pointers

[Leonard "paniq" Ritter]

the problem still persists. does anyone have a solution?

Leonard "paniq" Ritter wrote:

> hi,
>
> i'm running into a problem i'm trying to fix since several days 
> without much luck. it seems my custom smart pointer class becomes 
> worthless when wrapper<> is used to construct an object whose methods 
> can be overridden in python.
>
> wrapper export code:
>
>            class_<WindowEventsWrap, bases<Mu::Interface::Unknown>, 
> Ptr<WindowEventsWrap>, boost::noncopyable>("WindowEvents")
>                
> .def("OnWidgetEvent",pure_virtual(&WindowEvents::OnWidgetEvent))
>                
> .def("WidgetEventHandled",pure_virtual(&WindowEvents::WidgetEventHandled)) 
>
>            ;
>
> wrapper declaration:
>
>        struct WindowEventsWrap
>            :    InterfaceImplementation<WindowEventsWrap, 
> Implements<Mu::Sandoz::Interface::WindowEvents> >,
>                wrapper< Mu::Sandoz::Interface::WindowEvents >
>
> python test code:
>
> class MyWindowEvents(Sandoz.WindowEvents):
>    def OnWidgetEvent(self, event):
>        print event.type
>        return Sandoz.Result.NotImplemented
>      def WidgetEventHandled(self, event, widget):
>        print event.type, widget
>        return Sandoz.Result.NotImplemented
>
> def Main():
>    mwe = MyWindowEvents()
>    view = Sandoz.ViewFrame("µ.Sandoz.ViewFrame")
>    view.Connect(mwe)
>    del mwe
>
> connect adds a reference to the mwe callback object and view calls 
> that object later on. this is known to work. however when i delete mwe 
> right after Connect(), the object itself persists, but its overridden 
> methods (and i guess the underlying python object as well) are gone. 
> no Release or AddReference on my object is called from wrapper_base, 
> so i assume it is not using my custom smart pointer class which deals 
> with this stuff.
>
> can someone suggest a solution to this problem?
>
> best regards,
> leonard
>
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