From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Xue Fuqiao Newsgroups: gmane.emacs.help Subject: About setf extensions Date: Fri, 15 Feb 2013 21:07:36 +0800 Organization: The Church of Emacs Message-ID: <20130215210736.c8720165c67622c5216266b4@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1360933680 2952 80.91.229.3 (15 Feb 2013 13:08:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 15 Feb 2013 13:08:00 +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 Feb 15 14:08:20 2013 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 1U6L1Y-00011J-99 for geh-help-gnu-emacs@m.gmane.org; Fri, 15 Feb 2013 14:08:20 +0100 Original-Received: from localhost ([::1]:42031 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U6L1E-0003QF-I4 for geh-help-gnu-emacs@m.gmane.org; Fri, 15 Feb 2013 08:08:00 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:37537) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U6L10-0003Of-M8 for help-gnu-emacs@gnu.org; Fri, 15 Feb 2013 08:07:55 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1U6L0w-0007Ww-Q3 for help-gnu-emacs@gnu.org; Fri, 15 Feb 2013 08:07:46 -0500 Original-Received: from mail-pb0-f52.google.com ([209.85.160.52]:44387) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U6L0w-0007Wn-Ks for help-gnu-emacs@gnu.org; Fri, 15 Feb 2013 08:07:42 -0500 Original-Received: by mail-pb0-f52.google.com with SMTP id ma3so610181pbc.39 for ; Fri, 15 Feb 2013 05:07:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:date:from:to:subject:message-id:organization:x-mailer :mime-version:content-type:content-transfer-encoding; bh=wUwr6i6nFqCMxI5T19VTmiRNqqtBxqJmWF/09dcBrY8=; b=nJZfGFkVN0vp1lxQdeXdGeySe9Zd2tXrMs49kA+TozWeCOTHjnywXJ/SFTxf4cj9uC tquyqZoNCRYq2+RcKrZJachzIPSQL//WLCQYEYJTQqeafVnO0oQGLLfQSjTjzVAVqVUx zmFd6Xn/Lo57GkcsqQel4T3589RsVWxtCU73L1h3LCRvCsJ2tRDaKkTObDLWNrE9gi8n UypTp+ZgpzliBJPqpf0QPrXid9zYE0YP747mV6PhXZPtcEfcwss5iiyw5ECx0GmxRUcC kB3onRIOr0BR5V1xc20/szOr5Ns+aQ8ybxz35jWCoZhsrj1R4fcKIJ4qPP5NXwfA/wo6 xz2Q== X-Received: by 10.68.58.3 with SMTP id m3mr5801813pbq.69.1360933662014; Fri, 15 Feb 2013 05:07:42 -0800 (PST) Original-Received: from Emacs ([124.117.94.252]) by mx.google.com with ESMTPS id pg6sm4701966pbb.0.2013.02.15.05.07.39 (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 15 Feb 2013 05:07:41 -0800 (PST) X-Mailer: Sylpheed 3.2.0 (GTK+ 2.24.13; x86_64-pc-linux-gnu) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 209.85.160.52 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:89106 Archived-At: In (info "(cl) Setf Extensions"): Most of these have directly corresponding "set" functions, like `use-local-map' for `current-local-map', or `goto-char' for `point'. A few, like `point-min', expand to longer sequences of code when they are used with `setf' (`(narrow-to-region x (point-max))' in this case). I don't understand the `point-min' example. What does the "x" mean here? I know it is the START argument of `narrow-to-region', but where is it from? And where will it be used? Thanks. -- Best regards, Xue Fuqiao. http://www.emacswiki.org/emacs/XueFuqiao