Re: GInterface on a per-instance-basis

[halfline <halfline hawaii rr com>]

Ronald Bultje wrote:

> In these other cases,
> the interface cast should return NULL (or something similar that tells
> me that it doesn't implement this interface).
When you write your interface, part of the boiler plate is to
define a macro: prefix_IS_interface-name
where prefix is the namespace of your project and interface-name
is the name of the interface.
ie.  GTK_IS_TREE_SORTABLE ()

You can use this macro to determine if an object supports the
your interface.

Note this is not the appropriate list for his type of question.
gtk-list or gtk-app-devel-list would probably be better.

--Ray Strode