Re: Wrapping variable argument functions

[José Alburquerque <jaalburquerque cox net>]

Murray Cumming wrote:
> On Thu, 2008-02-07 at 21:09 +0100, Murray Cumming wrote:
>   
> > On Thu, 2008-02-07 at 13:14 -0500, José Alburquerque wrote:
> >     
> > > Okay.  Here's the patch.  To produce the problem simply run 
> > > tests/test-caps.  The way it's in svn now, test/test-caps works fine, 
> > > but with this patch I get warnings.
> > >       
> > Now I understand. It's this strange thing in gstreamer that stops you
> > from changing items that have been referenced:
> >
> > (lt-test-caps:19844): GStreamer-CRITICAL **: gst_structure_set_value:
> > assertion `IS_MUTABLE (structure)' failed
> >
> > I really don't know what to do about them yet. It's an abuse of the
> > reference-counting system.
> >     
>
> I guess we need some way to return a RefPtr without referencing the C
> object, that would stop the original RefPtr from unreferencing its C
> object. But I can't imagine how to do that without adding a bool member
> variable to RefPtr.
>
>
>   
You know, I was sort of thinking that if in the Gst::Caps::set_simple() 
method an unreference is done at the beginning (if refcount > 1) and 
then a reference back at the end, this might work.

-Jose