From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Arbitrary function: find the number(s) of expected arguments Date: Sat, 19 Mar 2016 19:50:47 +0200 Message-ID: <83zitu73wo.fsf@gnu.org> References: <56E8906C.5050405@lanl.gov> <83egb68vfy.fsf@gnu.org> <87zituefp9.fsf@web.de> <83a8lu8srs.fsf@gnu.org> <87twk2ebp2.fsf@web.de> <838u1e8od1.fsf@gnu.org> <87pouqe9yw.fsf@web.de> <837fgy8mho.fsf@gnu.org> <87d1qqe53m.fsf@web.de> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1458409904 790 80.91.229.3 (19 Mar 2016 17:51:44 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 19 Mar 2016 17:51:44 +0000 (UTC) Cc: emacs-devel@gnu.org To: Michael Heerdegen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Mar 19 18:51:35 2016 Return-path: Envelope-to: ged-emacs-devel@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 1ahL2C-0006zm-CU for ged-emacs-devel@m.gmane.org; Sat, 19 Mar 2016 18:51:32 +0100 Original-Received: from localhost ([::1]:49898 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ahL2B-0002wc-RO for ged-emacs-devel@m.gmane.org; Sat, 19 Mar 2016 13:51:31 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:47240) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ahL1y-0002wT-IY for emacs-devel@gnu.org; Sat, 19 Mar 2016 13:51:19 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ahL1v-0005WT-D9 for emacs-devel@gnu.org; Sat, 19 Mar 2016 13:51:18 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:60861) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ahL1v-0005WP-9g; Sat, 19 Mar 2016 13:51:15 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4392 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1ahL1u-0007EM-GL; Sat, 19 Mar 2016 13:51:15 -0400 In-reply-to: <87d1qqe53m.fsf@web.de> (message from Michael Heerdegen on Sat, 19 Mar 2016 18:43:09 +0100) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:201889 Archived-At: > From: Michael Heerdegen > Cc: emacs-devel@gnu.org > Date: Sat, 19 Mar 2016 18:43:09 +0100 > > Eli Zaretskii writes: > > > I disagree with this conclusion. The fact is that the Emacs Lisp > > interpreter does know how to produce a clear answer. > > Imagine `f' accepts, say, three arguments. Now, let's > > (advice-add 'f :around > (defun my-f-around-advice (orig-f &rest args) > (let ((some-value (g args))) > (if (function-p (car-safe some-value)) > (apply (car some-value) (cdr some-value)) > (if (h args) > (k args) > (apply orig-f some-value)))))) > > What should (function-arity #'f) return? How is that relevant to the cited text? And what is the purpose of continuing this argument?