Re: Problems with signals and object destruction

[Christian Borup <borup borup com>]

On Fri, 2007-04-20 at 13:48 +1000, Daniel Kasak wrote:
> muppet wrote:
>
> > This sort of gymnastics should not be necessary.  GObject will  
> > destroy all of its signal handlers in the base GObject::dispose()  
> > method (part of the destruction process), and Glib::Object connects  
> > those with closures so that we get proper destruction notification  
> > for cleaning up the callback subroutine and user data references.   
> > With that, and reference counting everywhere, everything should Just  
> > Work.
>
> Cool.
>
> > The situations you want to watch out for are:
> >
> > - Any form of circular reference.  Avoid keeping references to yourself.
>
> Doh! In Gtk2::Ex::Datasheet::DBI I'm creating circular references so 
> that TreeViewColumns have access to the definition used to set them up. 
> I was wondering if this would create problems ... certainly EPIC ( 
> Eclipse Perl debugger ) doesn't like it. I'll come up with a less dodgy 
> way of packing info into TreeViewColumns.

[snip]

> Anyway, I'll look into getting rid of those circular references.

You could just weaken the reference, using weaken from Scalar::Util.
That should keep your objects from leaking, without major surgery on you
code.

./borup