From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Klaus Berndl Newsgroups: gmane.emacs.help Subject: Re: replacing a certain element in a list with another Date: 30 Sep 2003 11:59:39 +0200 Organization: "sd&m AG, Muenchen, Germany" Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Message-ID: References: NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: sea.gmane.org 1064916131 21705 80.91.224.253 (30 Sep 2003 10:02:11 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 30 Sep 2003 10:02:11 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Sep 30 12:02:10 2003 Return-path: Original-Received: from monty-python.gnu.org ([199.232.76.173]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1A4HKb-00018X-00 for ; Tue, 30 Sep 2003 12:02:09 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.22) id 1A4HK5-0004Cc-0B for geh-help-gnu-emacs@m.gmane.org; Tue, 30 Sep 2003 06:01:37 -0400 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!logbridge.uoregon.edu!news.maxwell.syr.edu!in.100proofnews.com!in.100proofnews.com!news2.euro.net!195.129.110.7.MISMATCH!lnewsoutpeer00.lnd.ops.eu.uu.net!lnewsinpeer01.lnd.ops.eu.uu.net!emea.uu.net!news.sdm.de!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 53 Original-NNTP-Posting-Host: sachrang.muc.sdm.de Original-X-Trace: news.sdm.de 1064915983 3929 193.102.181.186 (30 Sep 2003 09:59:43 GMT) Original-X-Complaints-To: usenet@news.sdm.de Original-NNTP-Posting-Date: Tue, 30 Sep 2003 09:59:43 +0000 (UTC) User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 Original-Xref: shelby.stanford.edu gnu.emacs.help:116956 Original-To: help-gnu-emacs@gnu.org X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.2 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: main.gmane.org gmane.emacs.help:12882 X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:12882 On 30 Sep 2003, David Kastrup wrote: > Klaus Berndl writes: > > > Suppose i have the following list: > > > > '(a b c d) > > > > What is a good way to replace one of the list-elements with another, so > > foe example replacing the 'c with 'e? > > > But: i do not want using any c-functions, so i would prefer a > > solution without using `substitute'! > > Uh, what? This comes from a recommendation in the elisp-info-manual (Standards --> Coding conventions"): * Please don't require the `cl' package of Common Lisp extensions at run time. Use of this package is optional, and it is not part of the standard Emacs namespace. If your package loads `cl' at run time, that could cause name clashes for users who don't use that package. However, there is no problem with using the `cl' package at compile time, for the sake of macros. You do that like this: (eval-when-compile (require 'cl)) I interpret this ("...for the sake of macros...") so, that at least for packages for GNU Emacs the code can use cl-macros but should not use any functions from the cl package. Please correct me if i have misunderstood here something!? > > Anyhow, try > > (let ((xxx '(a b c d))) > (setcar (member 'c xxx) 'e) > xxx) Thanks a lot, David! Ciao, Klaus -- Klaus Berndl mailto: klaus.berndl@sdm.de sd&m AG http://www.sdm.de software design & management Thomas-Dehler-Str. 27, 81737 München, Germany Tel +49 89 63812-392, Fax -220