Re: [Vala] Dbus, connecting a signal to an async method...

[Marco Trevisan (Treviño) <mail 3v1n0 net>]

Il giorno dom, 05/12/2010 alle 21.10 +0100, Jan Hudec ha scritto:
> On Sat, Dec 04, 2010 at 12:35:26 +0100, Marco Trevisan (Treviño) wrote:
> > Il giorno ven, 03/12/2010 alle 17.18 +0100, Abderrahim Kitouni ha
> > scritto:
> > > > session_proxy.name_acquired.connect (this.name_acquired);
> > > What I would have done is:
> > >
> > > session_proxy.name_acquired.connect ((name) => this.name_acquired.begin(name));
> >
> > Ok, cool this works thanks. However in this case the lambda should be
> > (p, name) => this.nameacquired.begin(p, name); ;-)
> >
> > However I guess that this is just a workaround, the related bug should
> > be fixed!
>
> It's not a bug. The 'async' is part of the function signature, so the
> function signatures don't match and it can't be converted.
>
> It might be a missing feature, but I think it's preferable to explicitly
> require the .begin.

Yes, this is right indeed. The signature is not the same, so why don't
allow to define async signals?

> > > You can also try to pass the begin method directly (but I'm not sure it
> > > works).
> >
> > No, I tried that, but it didn't work, I got an error since the begin
> > return value was considered just like a void.
>
> Hm, the begin function returns a void, but that's what the signal expects
> anyway, so it seems like that one should work. That would be a bug than.

It doesn't work to me:

marco tricky:/tmp$ valac --pkg dbus-glib-1 --pkg gio-2.0
dbus-connect-async.vala 
warning: D-Bus GLib is deprecated, use GDBus
dbus-connect-async.vala:38.15-38.39: error: invocation of void method
not allowed as expression
                if (name in sender.list_names.begin())
                            ^^^^^^^^^^^^^^^^^^^^^^^^^
Compilation failed: 1 error(s), 1 warning(s)

Is this a bug?