Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site umcp-cs.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!rlgvax!cvl!umcp-cs!chris From: chris@umcp-cs.UUCP Newsgroups: net.lang.lisp Subject: Re: Optional Arguments in Franz Lisp Message-ID: <7420@umcp-cs.UUCP> Date: Fri, 8-Jun-84 07:52:15 EDT Article-I.D.: umcp-cs.7420 Posted: Fri Jun 8 07:52:15 1984 Date-Received: Sat, 9-Jun-84 07:44:39 EDT References: <2511@allegra.UUCP> <3033@brl-tgr.ARPA> Organization: Univ. of Maryland, Computer Science Dept. Lines: 21 As I understand it [and I only dabble in Franz occasionally so don't take this TOO seriously], (defun f (&optional ... makes some optional arguments, with [again optional] default values if said optional arguments are not passed. (defun f (&optional (x nil) (y 'foo)) ... should make ``x'' bound to the first argument if any, nil if none, and ``y'' bound to the second argument if any, or 'foo if none. [It may also be written as ``(&optional x (y 'foo))''.] As far as I know, &optional must come after all the non-optional arguments, not be used twice, and not be used in conjunction with &rest. -- In-Real-Life: Chris Torek, Univ of MD Comp Sci (301) 454-7690 UUCP: {seismo,allegra,brl-bmd}!umcp-cs!chris CSNet: chris@umcp-cs ARPA: chris@maryland