From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.help Subject: Re: Is it possible for a macro to expand to nothing? Date: Fri, 27 Nov 2009 01:32:35 -0700 Message-ID: References: <87vdh1ccra.fsf@galatea.local> <87my2dc8d7.fsf@galatea.local> <873a44dcf2.fsf@galatea.local> <87pr78b6n9.fsf@galatea.local> <87ljhwb2dx.fsf@galatea.local> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1259310809 24578 80.91.229.12 (27 Nov 2009 08:33:29 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 27 Nov 2009 08:33:29 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Nov 27 09:33:22 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1NDwGX-0006tA-Tg for geh-help-gnu-emacs@m.gmane.org; Fri, 27 Nov 2009 09:33:22 +0100 Original-Received: from localhost ([127.0.0.1]:42674 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NDwGX-0000AQ-9U for geh-help-gnu-emacs@m.gmane.org; Fri, 27 Nov 2009 03:33:21 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NDwGA-0000AL-0f for help-gnu-emacs@gnu.org; Fri, 27 Nov 2009 03:32:58 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NDwG4-00008R-A7 for help-gnu-emacs@gnu.org; Fri, 27 Nov 2009 03:32:56 -0500 Original-Received: from [199.232.76.173] (port=44759 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NDwG4-00008O-5N for help-gnu-emacs@gnu.org; Fri, 27 Nov 2009 03:32:52 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:48860) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NDwG3-0001Fm-QK for help-gnu-emacs@gnu.org; Fri, 27 Nov 2009 03:32:52 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.50) id 1NDwFy-0006g8-0L for help-gnu-emacs@gnu.org; Fri, 27 Nov 2009 09:32:46 +0100 Original-Received: from c-71-237-24-138.hsd1.co.comcast.net ([71.237.24.138]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 27 Nov 2009 09:32:45 +0100 Original-Received: from kevin.d.rodgers by c-71-237-24-138.hsd1.co.comcast.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 27 Nov 2009 09:32:45 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 15 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: c-71-237-24-138.hsd1.co.comcast.net User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812) In-Reply-To: X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:70175 Archived-At: Alan Mackenzie wrote: > Your notion of the correct use of macros seems to be a religious idea > rather than one fully thought through. You justify it with circular > reasoning. Whilst using a macro to generate an evalable form may be the > most usual thing, there is no reason not to use it to produce other list > structure. Except that such macros can only be executed in a particular context i.e. they depend on something that cannot be expressed via their argument list. At best that is poor style, and at worst it is poor engineering. -- Kevin Rodgers Denver, Colorado, USA