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From: djz@cmu-cs-spice.ARPA (Daniel Zigmond)
Newsgroups: net.lang.lisp
Subject: Putprop (or put) vs. setf with get
Message-ID: <374@cmu-cs-spice.ARPA>
Date: Wed, 5-Jun-85 19:36:24 EDT
Article-I.D.: cmu-cs-s.374
Posted: Wed Jun  5 19:36:24 1985
Date-Received: Fri, 7-Jun-85 02:00:06 EDT
Organization: Carnegie-Mellon University, CS/RI
Lines: 20

In a compatibility note on page 165 of Common Lisp: the Language, Guy
Steele writes:

"...What MacLisp and InterLisp call puprop is accomplished in Common Lisp by
using get with setf."

However, because setf is a macro, all Common Lisps must have some form of
putprop (or put).  In Spice Lisp, (macroexpand '(setf (get 'a 'b) 'c) returns
something like:

(let ((g1 'a) ;the numbers vary, of course.
      (g2 'b)
      (g4 'c))
     (%put g1 g2 g4)) 

So although Common Lisp does not directly support putprop, it is still
essential (as was pointed out by someone in a previous message) to have
something like putprop for the setf with get to expand into.

	Dan Zigmond