From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (from majordomo@localhost) by pauillac.inria.fr (8.7.6/8.7.3) id LAA20612; Sat, 9 Oct 2004 11:08:12 +0200 (MET DST) X-Authentication-Warning: pauillac.inria.fr: majordomo set sender to owner-caml-list@pauillac.inria.fr using -f Received: from concorde.inria.fr (concorde.inria.fr [192.93.2.39]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id LAA20602 for ; Sat, 9 Oct 2004 11:08:11 +0200 (MET DST) Received: from smtp1.adl2.internode.on.net (smtp1.adl2.internode.on.net [203.16.214.181]) by concorde.inria.fr (8.13.0/8.13.0) with ESMTP id i99988tn024711 for ; Sat, 9 Oct 2004 11:08:10 +0200 Received: from [192.168.1.200] (ppp213-29.lns2.syd3.internode.on.net [203.122.213.29]) by smtp1.adl2.internode.on.net (8.12.9/8.12.9) with ESMTP id i9997t4Y065804; Sat, 9 Oct 2004 18:37:56 +0930 (CST) Subject: Re: [Caml-list] Recursive lists From: skaller Reply-To: skaller@users.sourceforge.net To: Keith Wansbrough Cc: Alex Baretta , David Brown , caml-list@pauillac.inria.fr In-Reply-To: References: Content-Type: text/plain Message-Id: <1097312874.19722.168.camel@pelican.wigram> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-4) Date: 09 Oct 2004 19:07:54 +1000 Content-Transfer-Encoding: 7bit X-Miltered: at concorde with ID 4167AA78.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Loop: caml-list@inria.fr X-Spam: no; 0.00; caml-list:01 sourceforge:01 2004:99 cyclic:01 9660:01 glebe:01 nsw:01 snail:02 lazy:02 lazy:02 checkout:02 module:03 2037:03 wrote:03 fetch:03 Sender: owner-caml-list@pauillac.inria.fr Precedence: bulk On Sat, 2004-10-09 at 18:35, Keith Wansbrough wrote: > > So there is actually a good argument for a Stream > > module with hd and tl functions (and lazy map ..) > > Even lazy map shouldn't do cycle-detection, though: I would expect a > cyclic stream to be mapped to an infinite one. Yes, what I meant was that for a data type s:'a stream, and a function f: 'a -> 'b, the function map f s : 'b stream creates a new stream represented by the pair (f,s) with hd (f,s) = f (hd s). In other words, the map is only applied when you fetch an element. -- John Skaller, mailto:skaller@users.sf.net voice: 061-2-9660-0850, snail: PO BOX 401 Glebe NSW 2037 Australia Checkout the Felix programming language http://felix.sf.net ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners