From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=AWL autolearn=disabled version=3.1.3 X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from discorde.inria.fr (discorde.inria.fr [192.93.2.38]) by yquem.inria.fr (Postfix) with ESMTP id 6DF08BC69 for ; Wed, 18 Jul 2007 22:47:39 +0200 (CEST) Received: from pih-relay06.plus.net (pih-relay06.plus.net [212.159.14.133]) by discorde.inria.fr (8.13.6/8.13.6) with ESMTP id l6IKlciD031288 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Wed, 18 Jul 2007 22:47:39 +0200 Received: from [80.229.56.224] (helo=beast.local) by pih-relay06.plus.net with esmtp (Exim) id 1IBGQs-0004Hy-2v for caml-list@yquem.inria.fr; Wed, 18 Jul 2007 21:47:38 +0100 From: Jon Harrop Organization: Flying Frog Consultancy Ltd. To: caml-list@yquem.inria.fr Subject: Re: [Caml-list] modifying hash tables Date: Wed, 18 Jul 2007 21:38:17 +0100 User-Agent: KMail/1.9.7 References: <469E3171.7040205@gnu.org> In-Reply-To: <469E3171.7040205@gnu.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707182138.17761.jon@ffconsultancy.com> X-Miltered: at discorde with ID 469E7C6A.000 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)! X-Spam: no; 0.00; hash:01 hashtable:01 iter:01 hashtable:01 iter:01 hash:01 ocaml:01 ocaml:01 frog:98 wrote:01 caml-list:01 int:01 data:02 data:02 modifying:02 On Wednesday 18 July 2007 16:27:45 Sam Steingold wrote: > I want to modify the _current_ datum in Hashtable.iter, e.g., increment > a count. Is this code valid? > Hashtable.iter ht ~f:(fun ~key ~data -> > Hashtable.replace ht ~key ~data:(data+1)) > (it appears to work, but I was told that "it is not guaranteed to work", > i.e., the documentation does not promise that). > If the above code is wrong, what is TRT? I would store "int ref"s in the hash table and use "incr". -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. OCaml for Scientists http://www.ffconsultancy.com/products/ocaml_for_scientists/?e