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 BBEEFBC69 for ; Mon, 16 Jul 2007 04:06:10 +0200 (CEST) Received: from ptb-relay02.plus.net (ptb-relay02.plus.net [212.159.14.213]) by discorde.inria.fr (8.13.6/8.13.6) with ESMTP id l6G26ABf008345 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Mon, 16 Jul 2007 04:06:10 +0200 Received: from [80.229.56.224] (helo=beast.local) by ptb-relay02.plus.net with esmtp (Exim) id 1IAFyT-00065H-Kq for caml-list@yquem.inria.fr; Mon, 16 Jul 2007 03:06:09 +0100 From: Jon Harrop Organization: Flying Frog Consultancy Ltd. To: caml-list@yquem.inria.fr Subject: Re: [Caml-list] Recursive class+type definitions Date: Mon, 16 Jul 2007 03:00:52 +0100 User-Agent: KMail/1.9.7 References: <11E0700C-4331-42AB-88F1-E6BD21D72F78@rice.edu> In-Reply-To: <11E0700C-4331-42AB-88F1-E6BD21D72F78@rice.edu> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200707160300.52686.jon@ffconsultancy.com> X-Miltered: at discorde with ID 469AD292.000 by Joe's j-chkmail (http://j-chkmail . ensmp . fr)! X-Spam: no; 0.00; recursive:01 recursive:01 getx:01 recursion:01 getx:01 ocaml:01 ocaml:01 frog:98 wrote:01 caml-list:01 define:01 data:02 types:03 float:03 float:03 On Monday 16 July 2007 02:29:47 Raj B wrote: > Hi all > > Can we have mutually recursive definitions mixing types and classes? > For example, I want to define > a class called mypoint, which contains another data structure (say, a > custom list) of mypoints. > > class virtual mypoint = > object > method virtual getx : float > method virtual getlist : mypointlist > end > > type mypointlist = Empty | Cons of (mypoint * mypointlist) > > What is the best way to achieve this kind of mutual recursion? Good question. No idea. But you can do this: class virtual ['a] mypoint = object method virtual getx : float method virtual getlist : 'a end;; type mypointlist = Empty | Cons of (mypointlist mypoint * mypointlist);; -- Dr Jon D Harrop, Flying Frog Consultancy Ltd. The OCaml Journal http://www.ffconsultancy.com/products/ocaml_journal/?e