Re: GObject: Freeing memory of instance members?

["Alexandre Moreira" <alexandream gmail com>]

On 5/3/07, Øystein Johansen <oystein gnubg org> wrote:
> David Nečas (Yeti) wrote:
> > On Thu, May 03, 2007 at 10:40:17PM +0200, ??ystein Johansen wrote:
> >> Aha, but how/where to I set the pointer to the finalize() function?
> >
> > In my_class_init() where you override all other methods.
> > See (almost) any Gtk+ widget for examples.
>
> Aha again! I guess I can free private members in the same method as well?
>
> static void
> neural_net_finalize (GObject *object)
> {
>   NeuralNet *nn;
>
>   g_return_if_fail (IS_NEURAL_NET(object));
>
>   nn = NEURAL_NET(object);
>
>   g_free(nn->priv->weight_h);
>   g_free(nn->priv->weight_o);
>   g_free(nn->priv->bias_h);
>   g_free(nn->priv->bias_o);
>   g_free(nn->priv->filename);
>   g_free(nn->priv);
>
>   g_message("This is the finalize method and I've freed the instance
> members!\n");
>
> }
>
> static void
> neural_net_class_init (NeuralNetClass *klass){
>         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
>         gobject_class->finalize = neural_net_finalize;
>         g_type_class_add_private (klass, sizeof (NeuralNetPrivate));
> }
>
> I think this looks ok, doesn't it? No, wait a minite.... What about the
> parent? This class has GObjectClass as parent, how do I call it's finalize?

At your class_init you should peek (g_type_class_peek_parent, using
your class pointer as parameter) a pointer to your parent class and
keep it in a global storage, accessible to your finalize.

Then, in your finalize method you call the finalize method on this
pointer you just got from peek_parent, something like:

G_OBJECT_CLASS(parent_class)->finalize(pointer_to_the_object_being_finalized);

I hope this helps.
Alexandre Moreira.

> Thanks,
> -Øystein
>
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