From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#12314: 24.2.50; `add-to-history': use `setq' with `delete' Date: Sun, 09 Sep 2012 21:20:38 +0300 Message-ID: <83txv7kqh5.fsf@gnu.org> References: <7602D24B74DE42CF9901322634B85CA2@us.oracle.com> <87sjas4mc2.fsf@gnu.org> <83ipbomv6e.fsf@gnu.org> <2C45207ADF0E46BC98AF1B486695F632@us.oracle.com> <83fw6smti6.fsf@gnu.org> <9A8F619FD7584123A6319BD089E444E4@us.oracle.com> <83bohgmrdv.fsf@gnu.org> <83a9x0mq5e.fsf@gnu.org> <8E40573C868D4B339513A16A02588F5E@us.oracle.com> <837gs4mcqy.fsf@gnu.org> <83627nnc2l.fsf@gnu.org> <83392rm840.fsf@gnu.org> <38A3421174894E56BCF8C118983375B0@us.oracle.com> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1347214896 29411 80.91.229.3 (9 Sep 2012 18:21:36 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 9 Sep 2012 18:21:36 +0000 (UTC) Cc: 12314@debbugs.gnu.org, cyd@gnu.org To: Drew Adams Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Sep 09 20:21:38 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TAm8Y-0007TZ-AA for geb-bug-gnu-emacs@m.gmane.org; Sun, 09 Sep 2012 20:21:38 +0200 Original-Received: from localhost ([::1]:57916 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TAm8U-0003t2-W6 for geb-bug-gnu-emacs@m.gmane.org; Sun, 09 Sep 2012 14:21:34 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:35029) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TAm8T-0003st-27 for bug-gnu-emacs@gnu.org; Sun, 09 Sep 2012 14:21:33 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TAm8S-0004Pw-3k for bug-gnu-emacs@gnu.org; Sun, 09 Sep 2012 14:21:32 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:40997) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TAm8S-0004Ps-0X for bug-gnu-emacs@gnu.org; Sun, 09 Sep 2012 14:21:32 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1TAm8v-0003EG-Vv for bug-gnu-emacs@gnu.org; Sun, 09 Sep 2012 14:22:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 09 Sep 2012 18:22:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 12314 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 12314-submit@debbugs.gnu.org id=B12314.134721487312344 (code B ref 12314); Sun, 09 Sep 2012 18:22:01 +0000 Original-Received: (at 12314) by debbugs.gnu.org; 9 Sep 2012 18:21:13 +0000 Original-Received: from localhost ([127.0.0.1]:50541 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TAm89-0003D3-3o for submit@debbugs.gnu.org; Sun, 09 Sep 2012 14:21:13 -0400 Original-Received: from mtaout20.012.net.il ([80.179.55.166]:59863) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TAm85-0003Cu-Qt for 12314@debbugs.gnu.org; Sun, 09 Sep 2012 14:21:11 -0400 Original-Received: from conversion-daemon.a-mtaout20.012.net.il by a-mtaout20.012.net.il (HyperSendmail v2007.08) id <0MA300100GZSDX00@a-mtaout20.012.net.il> for 12314@debbugs.gnu.org; Sun, 09 Sep 2012 21:20:38 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout20.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MA3001UZHM99M30@a-mtaout20.012.net.il>; Sun, 09 Sep 2012 21:20:33 +0300 (IDT) In-reply-to: <38A3421174894E56BCF8C118983375B0@us.oracle.com> X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:64013 Archived-At: > From: "Drew Adams" > Cc: <12314@debbugs.gnu.org>, > Date: Sun, 9 Sep 2012 10:35:21 -0700 > > Eli, at the risk of butting in, I respectfully suggest that you might not be > reading about this topic well enough or perhaps not thinking enough about it. How is this remark helpful? > Stefan is making the point that when programmers use `delete' or `delq' or > `nconc' they often do so to improve the performance of their code. Which is > true. This is an entirely different issue. "Destructive modification" does not imply the optimization you (and evidently Stefan) are alluding to, at least not universally so, nor a possibility to piggy-back that to optimize application code. It just means that the original object is modified (a.k.a. "destroyed") in the process.