From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: David Kastrup Newsgroups: gmane.emacs.help Subject: Re: How many parameters does an elisp function take? Date: Wed, 16 Feb 2005 22:02:21 +0100 Organization: Organization?!? Message-ID: References: <9e90vc.o7.ln@acm.acm> <37hpndF5cn882U1@individual.net> NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1108587833 13940 80.91.229.2 (16 Feb 2005 21:03:53 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Wed, 16 Feb 2005 21:03:53 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Feb 16 22:03:53 2005 Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1D1WKp-0003Cu-LZ for geh-help-gnu-emacs@m.gmane.org; Wed, 16 Feb 2005 22:03:47 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1D1Waq-0003UW-AS for geh-help-gnu-emacs@m.gmane.org; Wed, 16 Feb 2005 16:20:20 -0500 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!newsmi-us.news.garr.it!newsmi-eu.news.garr.it!NewsITBone-GARR!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 16 Original-X-Trace: individual.net 5q0U2shBiwZm+HNFQFcXxQc67EDL1BAQY0cEfBQ2pw6edz1UKR X-Face: 2FEFf>]>q>2iw=B6, xrUubRI>pR&Ml9=ao@P@i)L:\urd*t9M~y1^:+Y]'C0~{mAl`oQuAl \!3KEIp?*w`|bL5qr,H)LFO6Q=qx~iH4DN; i"; /yuIsqbLLCh/!U#X[S~(5eZ41to5f%E@'ELIi$t^ Vc\LWP@J5p^rst0+('>Er0=^1{]M9!p?&:\z]|;&=NP3AhB!B_bi^]Pfkw User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) Cancel-Lock: sha1:+4NKcPv2jUlEaukVrjHkGJoDEf8= Original-Xref: shelby.stanford.edu gnu.emacs.help:128608 Original-To: help-gnu-emacs@gnu.org 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 X-MailScanner-To: geh-help-gnu-emacs@m.gmane.org Xref: main.gmane.org gmane.emacs.help:24139 X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:24139 Kevin Rodgers writes: > Alan Mackenzie wrote: >> Is it possible to determine at run time how many parameters an elisp >> function takes? For example, I'd like to write something like: >> (how-many-params 'null) >> and have it evaluate to 1. Or something like that. Together with >> some >> reasonable convention for indicating &optional and &rest arguments. > > I would start with eldoc-function-arglist. For built-in functions, subr-arity might help. -- David Kastrup, Kriemhildstr. 15, 44793 Bochum