Re: macro IS_xxx
- From: Andrea Zagli <azagli inwind it>
- To: gtk-app-devel-list gnome org
- Subject: Re: macro IS_xxx
- Date: Sun, 24 Jun 2007 11:34:08 +0200
Il giorno dom, 24/06/2007 alle 10.32 +0200, David NeÄas (Yeti) ha
scritto:
On Sun, Jun 24, 2007 at 09:48:01AM +0200, Andrea Zagli wrote:
i have GObject A and GObject B; B is a A's subclass
obj_a = a_new ();
obj_b = b_new ();
(a_new() and b_new() return GObject)
when i call IS_OBJECT_A (obj_b) it returns TRUE: why?
Because obj_b *is* also an instance of A. That's the
whole point of subclassing.
To check the exact type you can get it with
G_TYPE_FROM_INSTANCE and compare. However, in most cases
needing this means there's something wrong with your design.
i need it because i pass obj_a/obj_b to a function that do different
things based on object type
is there a different way to make it without check the object type?
is it a bug? or is it normal?
Show me a single object system implementation that behaves
differently in this regard...
i don't know... but i'm not an expert of oop
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