Re: How to use GtkTreeSortable

["Jeffrey W. Baker" <jwbaker acm org>]

On Wed, 2002-02-06 at 06:53, Oleg N. Mayboroda wrote:
> Hello all,
> I have got a question about the use of GtkTreeSortable,
> GtkTreeModelSort. Can somebody give an example of these interfaces
> using? What is GtkTreeIterCompareFunc (what should it return )? These
> items are undocumented (in testtreesort.c from CVS this question is not
> clarified too).

GtkTreeIterCompareFunc is (slghtly) documented here:
http://developer.gnome.org/doc/API/2.0/gtk/gtk-gtktreesortable.html#GTKTREEITERCOMPAREFUNC

gint (*GtkTreeIterCompareFunc)       (GtkTreeModel *model,
                                             GtkTreeIter *a,
                                             GtkTreeIter *b,
                                             gpointer user_data);

The return value isn't specified, but I presume that, like other sorting
functions I have seen, return -1 if a < b, 0 if a == b, and 1 if a > b. 
Logically, you return a - b.

-jwb