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From: eliot@phoenix.Princeton.EDU (Eliot Handelman)
Newsgroups: comp.lang.lisp
Subject: Re: STRUCTUREP
Message-ID: <3269@idunno.Princeton.EDU>
Date: 10 Oct 90 21:03:59 GMT
References: <753@forsight.Jpl.Nasa.Gov> <1990Oct10.091722.4495@hellgate.utah.edu> <754@forsight.Jpl.Nasa.Gov>
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In article <1990Oct10.091722.4495@hellgate.utah.edu>, moore%cdr.utah.edu@cs.utah.edu (Tim Moore) writes:
> In article <753@forsight.Jpl.Nasa.Gov> gat@robotics.Jpl.Nasa.Gov (Erann Gat) writes:
> >Is there any way in Common Lisp to test if an object is a structure?  There
> >doesn't seem to be a structurep function.
> >
;> >E.
;> 
;> Not portably.


You can do this, though:

>(defstruct structure)

>(defstruct (foo (:include structure))
   blah)

>(structure-p (make-foo))
T

Zetalisp, I think, did something like that automatically. the "structure"
structure would have DOCUMENTATION as one of its slots, eg. (I've
read most of the lisp machine manual, but I don't know too much about
its internals, on the other hand.)

--eliot