Re: GObject extension propose (GContainer)

[Tim Janik <timj imendio com>]

On Fri, 16 Jun 2006, Gustavo J. A. M. Carneiro wrote:

> Qui, 2006-06-15 às 13:00 -0400, Tristan Van Berkom escreveu:

> > All of that just to say... I cannot count the times I've thought to
> > myself that
> > GtkContainer should really just be GContainerIface, and implemented by
> > whatever interested objects that want to parent other objects...
>
>  That's interesting, but I wonder what is the runtime penalty of
> interface lookup compared to normal class structure lookup?  Is it
> really OK to use an interface for this, or is it better just to add a
> new virtual methods to the GObject class?

the lookup penalties are negligible.
type node/class lookups and is_a checks are O(1);
interface class lookups and conforms_to checks are O(ld(N)), where
N is the number of interfaces a type node conforms to.

> Gustavo J. A. M. Carneiro

---
ciaoTJ