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From: neves@uwai.UUCP
Newsgroups: net.lang.lisp
Subject: Re: Responses to: "LISP" by Winston & Horn: is the 2nd Edition better?
Message-ID: <208@uwai.UUCP>
Date: Mon, 3-Jun-85 10:18:31 EDT
Article-I.D.: uwai.208
Posted: Mon Jun  3 10:18:31 1985
Date-Received: Tue, 4-Jun-85 00:55:39 EDT
References: <2433@wateng.UUCP> <4384@mit-eddie.UUCP>
Distribution: net
Organization: U of Wisconsin CS Dept
Lines: 30

> >For example when they discuss property lists they mention how to get
> >values off the plist (with get) but they do not mention the function to
> >put properties on the property list (put).  Instead they use a macro
> >(setf) which is used to set other things as well.
> >
> >wisc-ai!neves (David Neves)

> Common Lisp doesn't have a "put" or "putprop" function.  The only way to
> put items on the property list in Common Lisp is with "setf".
> ...
> By the way, I don't think "setf" is a macro in CL (it is a macro in
> Maclisp and Zetalisp).  If it were, then there would have to be a "put"
> or "putprop" for it to expand into in the above use.
 ...

I have a prepublication version of the Steele book so I apologize if
I gave out some incorrect information above about putprop.  However,
my copy says that setf is a macro and that there is a function
"putpr" which places information on the property list.  I would hope that
setf is not a special form replacing array/property list functions because
this would introduce some inefficiency, wouldn't it?  If this
information is incorrect please correct me.

-- 
David Neves
Computer Sciences Department
University of Wisconsin-Madison

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