From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Differences between identical strings in Emacs lisp Date: Tue, 07 Apr 2015 17:10:03 -0400 Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1428441052 8118 80.91.229.3 (7 Apr 2015 21:10:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 7 Apr 2015 21:10:52 +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 Apr 07 23:10:44 2015 Return-path: Envelope-to: geh-help-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 1Yfalf-0002W0-Go for geh-help-gnu-emacs@m.gmane.org; Tue, 07 Apr 2015 23:10:43 +0200 Original-Received: from localhost ([::1]:48941 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yfale-0001CI-LU for geh-help-gnu-emacs@m.gmane.org; Tue, 07 Apr 2015 17:10:42 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:50989) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YfalC-0001CA-Pj for help-gnu-emacs@gnu.org; Tue, 07 Apr 2015 17:10:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Yfal8-0000wD-Ka for help-gnu-emacs@gnu.org; Tue, 07 Apr 2015 17:10:14 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:36339) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yfal8-0000w7-Dp for help-gnu-emacs@gnu.org; Tue, 07 Apr 2015 17:10:10 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Yfal7-0002FV-0k for help-gnu-emacs@gnu.org; Tue, 07 Apr 2015 23:10:09 +0200 Original-Received: from 65-110-216-75.cpe.pppoe.ca ([65.110.216.75]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 07 Apr 2015 23:10:08 +0200 Original-Received: from monnier by 65-110-216-75.cpe.pppoe.ca with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 07 Apr 2015 23:10:08 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 15 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 65-110-216-75.cpe.pppoe.ca User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:HhXOj+Wgg6IYuVdfP+AfMf8gKB8= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:103563 Archived-At: > both evaluate to (186), indicating that the strings contain the same > character(s). So they are identical. No: the "\xBA" string does not contain any character, it only contains bytes (we call such "string of bytes" a "unibyte string" and the usual "string of characters" is called a "multibyte string"). And yes, the (integer) codes of the bytes of "\xBA" happen to be identical to the (integer) codes of the characters of (concat '(#xBA)). So (equal (append "\xBA" nil) (append "º" nil)) is non-nil. Note that the same applies to: (equal (append "\xBA" nil) (append [#xBA] nil)) Stefan