From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: alist-get in Emacs 24? Date: Sat, 03 Oct 2015 05:05:35 +0200 Message-ID: <878u7k7itc.fsf@web.de> References: <871tddvl08.fsf@mbork.pl> <877fn5hgg8.fsf@web.de> <87pp0xu02o.fsf@mbork.pl> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1443841572 17362 80.91.229.3 (3 Oct 2015 03:06:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 3 Oct 2015 03:06:12 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Oct 03 05:06:02 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 1ZiD98-0005Cn-79 for geh-help-gnu-emacs@m.gmane.org; Sat, 03 Oct 2015 05:06:02 +0200 Original-Received: from localhost ([::1]:36758 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZiD97-0001Oe-O9 for geh-help-gnu-emacs@m.gmane.org; Fri, 02 Oct 2015 23:06:01 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:56391) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZiD8y-0001NS-8g for help-gnu-emacs@gnu.org; Fri, 02 Oct 2015 23:05:53 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZiD8t-00022q-8j for help-gnu-emacs@gnu.org; Fri, 02 Oct 2015 23:05:52 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:50457) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZiD8t-00022X-2W for help-gnu-emacs@gnu.org; Fri, 02 Oct 2015 23:05:47 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZiD8r-0004xZ-DD for help-gnu-emacs@gnu.org; Sat, 03 Oct 2015 05:05:45 +0200 Original-Received: from ip-90-186-2-63.web.vodafone.de ([90.186.2.63]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 03 Oct 2015 05:05:45 +0200 Original-Received: from michael_heerdegen by ip-90-186-2-63.web.vodafone.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 03 Oct 2015 05:05:45 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip-90-186-2-63.web.vodafone.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:FCeXID48vXS1RsFUJqPhvLH5Q28= 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:107492 Archived-At: Marcin Borkowski writes: > Of course. What I was asking was more or less "what is the percentage > of Emacs users who are on 23, 24... etc.". Are there any estimates? Good question. > Also, are there any good practices/guidelines as to how to indicate in > the code that some of its parts are meant for legacy Emacsen? So that > I can e.g. remove them 3 years from now without having to study all the > code, for example. Most people that want to support older Emacs versions do it like this in their code: (if (test-if-a-certain-feature-is-implemented) ;; Emacs >= 25.1 (code for newer Emacs versions ...) ;; Emacs < 25 (code for older Emacs versions)) Regards, Michael.