From: Alain Frisch <alain@frisch.fr>
To: "Dr. Thomas Fischbacher" <t.fischbacher@soton.ac.uk>
Cc: dmitry grebeniuk <gds-mlsts@moldavcable.com>,
"caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] Memory statistics tool
Date: Wed, 23 Jul 2008 15:16:40 +0200 [thread overview]
Message-ID: <48872F38.30609@frisch.fr> (raw)
In-Reply-To: <48872D6E.20209@soton.ac.uk>
> Many thanks! I just had a glance at it, but it seems to be just how one
> would have to approach such a problem. (The issue with hash-based
> approaches to find previously visited substructures is that during
> traversal, a GC may occur. Now I just assume that this may involve
> relocation and heap compaction in OCaml. The problem then is that
> OCaml does not properly support what would be known as eq hash tables
> in Lisp.)
As long as the data structure supports the polymorphic hash function, it
should work to simply use a regular hash table with the polymorphic hash
function and physical equality, as in:
module S = Hashtbl.Make(struct
type t = Obj.t
let hash = Hashtbl.hash
let equal = (==)
end);;
(Of course, this might be quite slow.)
-- Alain
next prev parent reply other threads:[~2008-07-23 13:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-23 10:54 Dr. Thomas Fischbacher
2008-07-23 11:47 ` [Caml-list] " Daniel Bünzli
2008-07-23 12:40 ` Jan Kybic
2008-07-23 12:44 ` dmitry grebeniuk
2008-07-23 13:09 ` Dr. Thomas Fischbacher
2008-07-23 13:16 ` Alain Frisch [this message]
2008-07-24 12:48 ` Dr. Thomas Fischbacher
2008-07-24 15:14 ` Alain Frisch
2008-07-24 15:44 ` Dr. Thomas Fischbacher
2008-07-24 16:12 ` Alain Frisch
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