From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Stephen J. Turnbull" Newsgroups: gmane.emacs.devel Subject: Re: Replacement for `aput' from obsolete assoc.el? Date: Sun, 10 Jun 2012 21:11:36 +0900 Message-ID: <87lijv8iyv.fsf@uwakimon.sk.tsukuba.ac.jp> References: <87txyrnhxi.fsf@web.de> <87oboytp45@ch.ristopher.com> <87haupwo6b.fsf@web.de> <871ulq44oj.fsf@gmail.com> <87pq9a7zab.fsf@uwakimon.sk.tsukuba.ac.jp> <87mx4c97za.fsf@uwakimon.sk.tsukuba.ac.jp> <87vcj0bxnq.fsf@gnuvola.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 X-Trace: dough.gmane.org 1339330318 10224 80.91.229.3 (10 Jun 2012 12:11:58 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Sun, 10 Jun 2012 12:11:58 +0000 (UTC) Cc: Andreas Schwab , Stefan Monnier , emacs-devel@gnu.org To: Thien-Thi Nguyen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun Jun 10 14:11:56 2012 Return-path: Envelope-to: ged-emacs-devel@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 1Sdgzr-00058P-KH for ged-emacs-devel@m.gmane.org; Sun, 10 Jun 2012 14:11:55 +0200 Original-Received: from localhost ([::1]:46311 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sdgzr-0001yD-DA for ged-emacs-devel@m.gmane.org; Sun, 10 Jun 2012 08:11:55 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:60305) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sdgzm-0001xh-G1 for emacs-devel@gnu.org; Sun, 10 Jun 2012 08:11:54 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sdgzi-0005fm-7y for emacs-devel@gnu.org; Sun, 10 Jun 2012 08:11:50 -0400 Original-Received: from mgmt1.sk.tsukuba.ac.jp ([130.158.97.223]:37606) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sdgzh-0005eg-Tz for emacs-devel@gnu.org; Sun, 10 Jun 2012 08:11:46 -0400 Original-Received: from uwakimon.sk.tsukuba.ac.jp (uwakimon.sk.tsukuba.ac.jp [130.158.99.156]) by mgmt1.sk.tsukuba.ac.jp (Postfix) with ESMTP id E02DA3FA0839; Sun, 10 Jun 2012 21:11:36 +0900 (JST) Original-Received: by uwakimon.sk.tsukuba.ac.jp (Postfix, from userid 1000) id A458F1A355D; Sun, 10 Jun 2012 21:11:36 +0900 (JST) In-Reply-To: <87vcj0bxnq.fsf@gnuvola.org> X-Mailer: VM 8.0.12-devo-585 under 21.5 (beta31) "ginger" b4715fcbe001 XEmacs Lucid (x86_64-unknown-linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 130.158.97.223 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:150872 Archived-At: Thien-Thi Nguyen writes: > () Andreas Schwab > () Sat, 09 Jun 2012 11:46:38 +0200 > > "Stephen J. Turnbull" writes: > > > `plist-put' and `plist-get' are actually defined in C, but this shows > > how `memq' works well with plists: > > > > (defun plist-get (plist key) > > (cadr (memq key plist))) > > That fails if key is eq to a value. > > That is, a value closer to the plist head than the desired key. > (If after, no worries.) True, but of course it's a bug. My bad. In practice the idiom `(memq key plist)' is sometimes useful where keys are guaranteed to be disjoint from values. I shouldn't have tried to overgeneralize.