Il giorno dom, 24/06/2007 alle 10.32 +0200, David Nečas (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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