From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Ted Zlatanov Newsgroups: gmane.emacs.devel Subject: Re: general lazy list facility for Emacs Lisp? Date: Wed, 23 Mar 2011 15:33:44 -0500 Organization: =?utf-8?B?0KLQtdC+0LTQvtGAINCX0LvQsNGC0LDQvdC+0LI=?= @ Cienfuegos Message-ID: <87d3lhinkn.fsf@lifelogs.com> References: <87pqphswn3.fsf@lifelogs.com> <877hbpzsy8.fsf@member.fsf.org> <87oc51rcal.fsf@lifelogs.com> <87oc51u3vb.fsf@gmail.com> <87k4fpk8ti.fsf@lifelogs.com> <87k4fpu1xx.fsf@gmail.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1300912894 31394 80.91.229.12 (23 Mar 2011 20:41:34 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Wed, 23 Mar 2011 20:41:34 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Mar 23 21:41:30 2011 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Q2Urw-0004rR-EM for ged-emacs-devel@m.gmane.org; Wed, 23 Mar 2011 21:41:28 +0100 Original-Received: from localhost ([127.0.0.1]:34636 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q2Ukq-0003Sm-4j for ged-emacs-devel@m.gmane.org; Wed, 23 Mar 2011 16:34:08 -0400 Original-Received: from [140.186.70.92] (port=36270 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q2Ukg-0003OW-Uy for emacs-devel@gnu.org; Wed, 23 Mar 2011 16:34:00 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q2Ukf-0001Vv-Oi for emacs-devel@gnu.org; Wed, 23 Mar 2011 16:33:58 -0400 Original-Received: from lo.gmane.org ([80.91.229.12]:49568) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q2Ukf-0001Vf-JD for emacs-devel@gnu.org; Wed, 23 Mar 2011 16:33:57 -0400 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1Q2Ukd-0008GJ-VG for emacs-devel@gnu.org; Wed, 23 Mar 2011 21:33:55 +0100 Original-Received: from 38.98.147.130 ([38.98.147.130]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 23 Mar 2011 21:33:55 +0100 Original-Received: from tzz by 38.98.147.130 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 23 Mar 2011 21:33:55 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 26 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: 38.98.147.130 X-Face: bd.DQ~'29fIs`T_%O%C\g%6jW)yi[zuz6; d4V0`@y-~$#3P_Ng{@m+e4o<4P'#(_GJQ%TT= D}[Ep*b!\e,fBZ'j_+#"Ps?s2!4H2-Y"sx" User-Agent: Gnus/5.110016 (No Gnus v0.16) Emacs/24.0.50 (gnu/linux) Cancel-Lock: sha1:6YU4XeZuNiSWMLw45k28t0VNtxA= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 80.91.229.12 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:137608 Archived-At: On Wed, 23 Mar 2011 19:27:54 +0100 Thierry Volpiatto wrote: TV> Ted Zlatanov writes: >> On Wed, 23 Mar 2011 18:46:16 +0100 Thierry Volpiatto wrote: >> TV> Not sure to understand what you want, but maybe have a look at some TV> ioccur.el functions: ELISP> (setq A '(a b c d)) TV> (a b c d) >> ELISP> (setq it (ioccur-iter-circular A)) >> >> That's useful but I was thinking more of infinite lists, TV> In this case ioccur-iter-circular produce infinite list. Hmm, it's not really what I had in mind, although it's certainly useful... The ioccur.el code returns an iterator across an existing collection. I need the next element dynamically generated, not retrieved from a pre-existing collection. The idea is to avoid the memory and CPU usage until you know you need the data. I think Tassilo's macro or something similar with closures is closer to my need and the general meaning of "lazy lists." Ted