Re: Single toggle reference only

[Yevgen Muntyan <muntyan tamu edu>]

Yevgen Muntyan wrote:
> Owen Taylor wrote:
>   
> > On Sat, 2007-10-20 at 17:58 -0500, Yevgen Muntyan wrote:
> >   
> >     
> > > Hi there,
> > >
> > > Is there a technical reason why toggle references
> > > allow only a single user? Namely, why
> > >
> > > " Multiple toggle references may be added to the same
> > > gobject, however if there are multiple toggle references
> > > to an object, none of them will ever be notified until all
> > > but one are removed."
> > >
> > > Why doesn't it emit a notification when reference count
> > > drops to N instead of 1, where N is number of
> > > g_object_add_toggle_ref() calls?
> > >     
> > >       
> > Say you have the following scenario:
> >
> >                                    GTK+ internal reference
> >                                          || A
> >                                          \/               
> >  C# application data => C# proxy <=> [ GObject ]
> >                                   B      /\
> >                                          || C
> >                                          \/
> >                              java implementation of object
> >                         
> > Your suggestion is that the toggle references B and C should be 
> > notified when the strong reference A is dropped. But then the
> > reference to the Java object would be converted to a weak
> > reference and the Java object improperly collected, even though
> > it is still referenced from the C# application.
> >   
> >     
>
> But it would happen only if C# kept the object, i.e. if it
> didn't drop its toggle reference. I'd think it contradicts
> the purpose of toggle references; it could be banned.
> Unless there is a use for toggle references other than
> attaching proxies which are kind of glued to the object.
>   

Sorry, nevermind. I got it.
Perhaps some GObjectProxy could work? A language
binding would then either take normal reference to
an object or "talk" to the proxy object. Need to draw
a picture.

Best regards,
Yevgen