From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Nikolaj Schumacher Newsgroups: gmane.emacs.help Subject: Re: Adding Lists/Sequences Date: Wed, 24 Sep 2008 11:28:07 +0200 Message-ID: References: <3b97cca7-1c31-4e07-ba09-f0aeca96019c@34g2000hsh.googlegroups.com> <85r67apl6z.fsf@lola.goethe.zz> <877i92qauj.fsf@thievol.homelinux.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1222248533 9936 80.91.229.12 (24 Sep 2008 09:28:53 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 24 Sep 2008 09:28:53 +0000 (UTC) Cc: help-gnu-emacs@gnu.org, David Kastrup To: Thierry Volpiatto Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Sep 24 11:29:50 2008 connect(): Connection refused Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1KiQgv-0001lz-9D for geh-help-gnu-emacs@m.gmane.org; Wed, 24 Sep 2008 11:29:49 +0200 Original-Received: from localhost ([127.0.0.1]:56137 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KiQfs-0000UG-5h for geh-help-gnu-emacs@m.gmane.org; Wed, 24 Sep 2008 05:28:44 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KiQfQ-0000U3-Q8 for help-gnu-emacs@gnu.org; Wed, 24 Sep 2008 05:28:16 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KiQfP-0000TS-6m for help-gnu-emacs@gnu.org; Wed, 24 Sep 2008 05:28:15 -0400 Original-Received: from [199.232.76.173] (port=49635 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KiQfP-0000TP-3S for help-gnu-emacs@gnu.org; Wed, 24 Sep 2008 05:28:15 -0400 Original-Received: from dd18200.kasserver.com ([85.13.138.168]:54653) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1KiQfK-0006tr-8R; Wed, 24 Sep 2008 05:28:10 -0400 Original-Received: from thursday (BAH736b.bah.pppool.de [77.135.115.107]) by dd18200.kasserver.com (Postfix) with ESMTP id ABDD5180291AF; Wed, 24 Sep 2008 11:28:09 +0200 (CEST) In-Reply-To: <877i92qauj.fsf@thievol.homelinux.org> (Thierry Volpiatto's message of "Wed\, 24 Sep 2008 09\:09\:08 +0200") User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2.50 (darwin) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 2) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:57987 Archived-At: Thierry Volpiatto wrote: > So can you explain when it is good (if it is) to use these destructive > functions. Generally, speed. Non-destructive operations often create or copy a lot of new cons cells. So in time critical regions of code, when you're only handling self-created data, and are very careful, that's the advantage in using them. regards, Nikolaj Schumacher