Re: [Vala] Floating references

[Alberto Mardegan <alberto mardegan canonical com>]

On 05/24/2012 01:22 PM, Luca Bruno wrote:
> On Tue, May 15, 2012 at 1:21 PM, Alberto Mardegan <
> alberto mardegan canonical com> wrote:
>
> > ========
> >    [ CCode ( returns_floating_reference = true ) ]
> >    public override unowned Gtk.Widget build_widget () {
> >        return new Gtk.Label ("Hello world!");
> >    }
> > ========
> >
> > but the code doesn't compile: "Return value transfers ownership but
> > method return type hasn't been declared to transfer ownership". If I
> > introduce a member variable to hold the GtkWidget then it works, but the
> > generated C code still calls g_object_ref_sink().
> >
> > It seems that the "returns_floating_reference" does nothing, or I didn't
> > understand how to use it?
>
> The return type must be still owned.

Do you mean that the Vala declaration of the method should be

    public override owned Gtk.Widget build_widget ();

instead?
I'm confused because GObject Introspection considers "(transfer
floating)" an alias for "(transfer none)". Which seems wrong to me,
because there's a big difference between the two. :-)

Ciao,
  Alberto