Thanks a lot for clearify this matter. So the bottom line is when there is
no mention
about the type of widget in argument we can use GtkWidget there, right?
From: Tristan Van Berkom <tristan.van.berkom@xxxxxxxxx>
To: DC A <adc4444@xxxxxxxxxxx>
CC: gtk-list@xxxxxxxxx
Subject: Re: Question about type casting.
Date: Sat, 08 Oct 2005 01:23:51 -0400
DC A wrote:
[...]
Why we cast for the first argument of this function but not the second
one?
It seems a little wierd, but eventually you find that its just easier
to
generalize where you can:
/* gtk_button_new & gtk_vbox_new return `GtkWidget *',
* not `GtkButton *'
*/
GtkWidget *vbox = gtk_vbox_new (FALSE, 0);
GtkWidget *button = gtk_button_new ();
/* Here we cast our `GtkWidget *vbox' to GTK_BOX to suit
* the api, most gtk functions take GtkWidget arguments
* (well, at least most container implementations do), so
* its just easier to declare every widget as `GtkWidget *'
* and not its subclass.
*/
gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
Cheers,
-Tristan
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