From: "Robert R. Schneck" <schneck at math.berkeley.edu>
Message-ID: <1026.209.145.86.33.1125101422.squirrel at math.berkeley.edu>
Date: Fri, 26 Aug 2005 17:10:22 -0700 (PDT)
Subject: Custom Tree Models
To: lablgtk at math.nagoya-u.ac.jp
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I'm interested in implementing a custom tree model in LablGTK2.  I've
written the C code necessary to implement the GObject huha and call back
into OCaml to do the actual work.  So far, it works fine.

The tricky part is the GtkTreeIter.  I want to have one of the fields be
a Caml value.  I gather from a previous post on this list that this might
be problematic for reasons of memory leakage.  I'm guessing the problem
is this: some C code creates a GtkTreeIter, there is an OCaml callback
during which a garbage collection is performed, suddenly the value stored
in the GtkTreeIter is moved to a different location but the GtkTreeIter
doesn't find out.  Is that it, or are there going to be other problems?
Can anyone think of a way to avoid the problem?

Best,
Robert