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Re: REMF and REMPROP
- To: Barry Margolin <Margolin@bco-multics.ARPA>
- Subject: Re: REMF and REMPROP
- From: coffee@aerospace.aero.org
- Date: Thu, 05 Feb 87 16:36:51 -0800
- Cc: common-lisp@sail.stanford.edu
- In-reply-to: Your message of Thu, 5 Feb 87 15:33 EST. <870205203355.967711@BCO-MULTICS.ARPA>
- Posted-date: Thu, 05 Feb 87 16:36:51 -0800
From Steele, p.165: "Note that there is no way to distinguish an absent
property from one whose value is <default>." The <default> argument is
optional and defaults in turn to nil, so get on an absent property is
normally identical in value to get on a property with explicit value nil.
Winston & Horn, p.97, shows (setf (get <sym> <prop>) nil) as equivalent
to remprop "as far as get is concerned...although it is better programming
practice to use remprop."
Cheers, Pc^2