From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: Using empty_string as the only "" string Date: Tue, 24 Apr 2007 23:38:17 +0200 Message-ID: References: <462E310C.20400@yandex.ru> 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: sea.gmane.org 1177450879 11476 80.91.229.12 (24 Apr 2007 21:41:19 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 24 Apr 2007 21:41:19 +0000 (UTC) Cc: Dmitry Antipov , emacs-devel@gnu.org To: "Juanma Barranquero" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Apr 24 23:41:17 2007 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1HgSlA-0004xD-5M for ged-emacs-devel@m.gmane.org; Tue, 24 Apr 2007 23:41:16 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HgSqh-0000Bd-J8 for ged-emacs-devel@m.gmane.org; Tue, 24 Apr 2007 17:46:59 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1HgSnu-0006qT-8y for emacs-devel@gnu.org; Tue, 24 Apr 2007 17:44:06 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1HgSnt-0006pa-6c for emacs-devel@gnu.org; Tue, 24 Apr 2007 17:44:05 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1HgSns-0006pA-Sj for emacs-devel@gnu.org; Tue, 24 Apr 2007 17:44:04 -0400 Original-Received: from mx2.suse.de ([195.135.220.15]) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1HgSiK-0004Lu-6b for emacs-devel@gnu.org; Tue, 24 Apr 2007 17:38:20 -0400 Original-Received: from Relay1.suse.de (mail2.suse.de [195.135.221.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx2.suse.de (Postfix) with ESMTP id 12A5821581; Tue, 24 Apr 2007 23:38:18 +0200 (CEST) X-Yow: ..I must be a VETERINARIAN.. In-Reply-To: (Juanma Barranquero's message of "Tue, 24 Apr 2007 20:50:26 +0200") User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.97 (gnu/linux) X-detected-kernel: Linux 2.4-2.6 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:69992 Archived-At: "Juanma Barranquero" writes: > On 4/24/07, Andreas Schwab wrote: > >> I see nothing wrong with that. > > I do see it. The issue is not string comparison, but object identity. > It's no different from > > (eq 0.0 0.0) =3D> nil > > I would be mightily surprised if > > (eq (- 2.0 0.0) (- 2.0 0.0)) =3D> nil > (eq (- 2.0 1.0) (- 2.0 1.0)) =3D> nil > (eq (- 2.0 2.0) (- 2.0 2.0)) =3D> t > > were true. In which way is this different from (eq (cdr '(a)) (cdr '(b))) =3D> t ? Andreas. --=20 Andreas Schwab, SuSE Labs, schwab@suse.de SuSE Linux Products GmbH, Maxfeldstra=DFe 5, 90409 N=FCrnberg, Germany PGP key fingerprint =3D 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED= 5 "And now for something completely different."