From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.help Subject: Re: Why a defmacro that calls a defun? Date: Tue, 03 Oct 2017 11:20:56 -0700 Message-ID: <87shf0ay9j.fsf@ericabrahamsen.net> References: NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1507054909 8747 195.159.176.226 (3 Oct 2017 18:21:49 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 3 Oct 2017 18:21:49 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.60 (gnu/linux) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Oct 03 20:21:45 2017 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dzRp9-0001DX-R1 for geh-help-gnu-emacs@m.gmane.org; Tue, 03 Oct 2017 20:21:43 +0200 Original-Received: from localhost ([::1]:59786 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dzRpC-0006Zi-3S for geh-help-gnu-emacs@m.gmane.org; Tue, 03 Oct 2017 14:21:46 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:47025) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dzRog-0006ZY-Pu for help-gnu-emacs@gnu.org; Tue, 03 Oct 2017 14:21:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dzRod-00044D-ME for help-gnu-emacs@gnu.org; Tue, 03 Oct 2017 14:21:14 -0400 Original-Received: from [195.159.176.226] (port=54980 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dzRod-0003wG-Er for help-gnu-emacs@gnu.org; Tue, 03 Oct 2017 14:21:11 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1dzRoQ-0005ri-9b for help-gnu-emacs@gnu.org; Tue, 03 Oct 2017 20:20:58 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 23 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:wQP1TIiMcxNAzL9f6t0EQf9/Zt4= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.help:114514 Archived-At: Barry Margolin writes: > In article , > Eric Abrahamsen wrote: > >> I'm poking through Gnus, and seeing a fair number of places with code >> that looks like this: >> >> (defmacro nnoo-define-skeleton (backend) >> `(eval-and-compile >> (nnoo-define-skeleton-1 ',backend))) >> >> (defun nnoo-define-skeleton-1 (backend) >> ...) >> >> What does this actually do? All I can see happening is that a quote mark >> is added before the BACKEND argument in the macro. What is happening >> here? > > It just causes the function to be called at compile time as well as run > time, due to the use of eval-and-compile. Huh, thanks for that. I guess it's obvious, but it was not clicking for me.