Re: Reference to a C++ object in GTK+ callbacks

[Daryl Lee <dlee altaregos com>]

On Tue, 2005-12-13 at 16:30 -0800, Stephen Pollei wrote:
> On 12/13/05, Paul Santa Maria <paulsm1021 yahoo com> wrote:
> > I'm coding in C++, but using the "raw" GTK+ C
> > libraries.
> I'm doing similiar for a game I'm making.
>
> >    ------------------
> > gboolean
> > play_cb (gpointer data)
> > {
> >   // Deference the object pointer to do the actual work
> >   AnimationFile *ani = (AnimationFile *)data;
> >   ani->start ();
> > }
> Are you sure that is the right style for that callback?
> static void
> rocket_cb(GtkWidget *widget, GdkEventExpose *event, gpointer data)
> {
>         class city_node *city=static_cast<class city_node *>(data);
>         global_game.rocket_up(*city);
>         city->update_targets();
>         each_tick(NULL);
> }

C++ functions do, indeed, have to be "static" to be used as GTK+
callbacks.

-- 
Daryl Lee
Open the Present--It's a Gift.