On Nov 19, 2009, at 4:15 PM, Jeff Hallock wrote:
-----Original Message-----
From: gtk-perl-list-boun...@gnome.org [mailto:gtk-perl-list-
boun...@gnome.org] On Behalf Of Zettai Muri
Sent: Thursday, November 19, 2009 3:56 PM
To: Martin Schlemmer; gtk-perl-list@gnome.org
Subject: Re: Gtk2::TreeModel - foreach
Where does the $user_data (scalar) part of the method come into play?
Is it possible to get an extended example that shows how this is
used?
Is this data within the ListStore or some other data passed to the
method? How does the method act on this data?
Again thanks for the help.
If you supply $user_data - then you it will be passed in as the last
argument to the ForEach function.
If you're thinking, "but i can just use a closure for that", then
you're already thinking perlishly.
The C api has user data pointers all over the place, because C doesn't
have closures. In perl, you get the option of using a closure or
passing different parameters to a single function. You'd choose to
use the single function plus user data instead of a closure in a
situation in which the closure would introduce a reference cycle.
Pretty much any other time, you'd use a closure.
--
I can't believe i'm having to arbitrate who gets to have what dress on
whose monkey.
-- Me, exasperated at the ridiculousness of parenthood.
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