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

[Stephen Pollei <stephen pollei gmail com>]

On 12/13/05, Daryl Lee <dlee altaregos com> wrote:
> > 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.
Untrue I just removed the static keyword from 8 of my callbacks and
then recompiled, worked just fine. As Andy Grebe of apogeelabs said
"... function needs to have the correct format".
That I bet was the problem. That I label a lot of my callbacks with
"static", I just consider good style.
diff -u1 gtk_main.cc-save gtk_main.cc > static-out.diff

The only c++ problem I can see is if you had overloaded functions; I
can't think of how you'd select which one you meant.

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