From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: =?ISO-8859-1?Q?Nordl=F6w?= Newsgroups: gmane.emacs.help Subject: Use of purecopy() Date: Tue, 3 Nov 2009 02:00:56 -0800 (PST) Organization: http://groups.google.com Message-ID: <7db147f3-8de9-4b69-b7e0-d8e1a9983cc6@m26g2000yqb.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1257244978 4026 80.91.229.12 (3 Nov 2009 10:42:58 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 3 Nov 2009 10:42:58 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Nov 03 11:42:52 2009 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 1N5Gqh-0003B6-JX for geh-help-gnu-emacs@m.gmane.org; Tue, 03 Nov 2009 11:42:51 +0100 Original-Received: from localhost ([127.0.0.1]:48866 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1N5Gqg-0003Jr-Ll for geh-help-gnu-emacs@m.gmane.org; Tue, 03 Nov 2009 05:42:50 -0500 Original-Path: news.stanford.edu!usenet.stanford.edu!postnews.google.com!m26g2000yqb.googlegroups.com!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 15 Original-NNTP-Posting-Host: 150.227.15.253 Original-X-Trace: posting.google.com 1257242456 9449 127.0.0.1 (3 Nov 2009 10:00:56 GMT) Original-X-Complaints-To: groups-abuse@google.com Original-NNTP-Posting-Date: Tue, 3 Nov 2009 10:00:56 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: m26g2000yqb.googlegroups.com; posting-host=150.227.15.253; posting-account=ytJKAgoAAAA1tg4ScoRszebXiIldA5vg User-Agent: G2/1.0 X-HTTP-Via: 1.1 ip1-w.foi.se:8080 (IronPort-WSA/6.3.0-523) X-HTTP-UserAgent: Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/532.3 (KHTML, like Gecko) Chrome/4.0.226.0 Safari/532.3,gzip(gfe),gzip(gfe) Original-Xref: news.stanford.edu gnu.emacs.help:174359 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:69440 Archived-At: I have seen a lot adding of purecopy() to Emacs CVS. Why? Does it reduce memory use and performance? Should it be used everywhere we have static string initializations in emacs-lisp code? I discovered it in Emacs CVS python.el and I have seen that emacs/lisp/ ChangeLog contains lots of such changes. Here are two sample lines taken from python.el (add-to-list 'auto-mode-alist (cons (purecopy "\\.py\\'") 'python- mode)) (add-to-list 'same-window-buffer-names (purecopy "*Python*")) Is this some special case where purecopy() is especially motivated? Thanks in advance, Nordl=F6w