Re: [Vala] Impossible to subclass from gio stream classes?

[Jan Hudec <bulb ucw cz>]

On Thu, Oct 01, 2009 at 14:57:19 +0200, Jiří Zárevúcky wrote:
> On Wed, Sep 30, 2009 at 7:46 PM, Jan Hudec <bulb ucw cz> wrote:
> > On Wed, Sep 30, 2009 at 18:58:54 +0200, Philipp Zabel wrote:
> > > I'd like to subclass GLib.BufferedInputStream.
> > > Vala doesn't like the following construct:
> > >
> > > class MyStream : GLib.BufferedInputStream {
> > >     MyStream (GLib.InputStream base_stream) {
> > >         base (base_stream);
> > >     }
> > > }
> > >
> > > $ valac mystream.vala --pkg gio-2.0
> > > mystream.vala:3.3-3.20: error: chain up to
> > > `GLib.BufferedInputStream..new' not supported
> > >         base (base_stream);
> > >         ^^^^^^^^^^^^^^^^^^
> > > Compilation failed: 1 error(s), 0 warning(s)
> > >
> > > Am I doing it wrong? BufferedInputStream has a constructor that takes
> > > one GLib.InputStream.
> >
> > Short story:
> > ------------
> >
> >    MyStream (GLib.InputStream _base_stream) {
> >        base_stream = _base_stream;
> >    }
> >
> > Long story:
> > -----------
> >
> > [...]
> > --
> >                                                 Jan 'Bulb' Hudec <bulb ucw cz>
>
> I take it this has changed recently?

It was like this from the begining. It must have been like this, because it's
how GObject library is designed.

> Last time I checked constructor chaining worked flawlessly. Is there
> any documentation on this new behavior?

It does work. Am I saying it does not? It's just that you can't use
non-default constructors of non-vala classes, because they are not really
there. And you never could, because they were never there.

-- 
                                                 Jan 'Bulb' Hudec <bulb ucw cz>