Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!eecae!cps3xx!cpsvax!artzi
From: artzi@cpsvax.cps.msu.edu (Ytshak Artzi - CPS)
Newsgroups: comp.lang.lisp
Subject: pointers in Lisp
Message-ID: <1710@cps3xx.UUCP>
Date: 2 Feb 89 23:53:19 GMT
Sender: usenet@cps3xx.UUCP
Reply-To: artzi@cpsvax.cps.msu.edu (Ytshak Artzi - CPS)
Organization: Michigan State University, Computer Science Department
Lines: 23

Problem:

      I need to implement (in Common Lisp) a structure with pointers. I will
use Pascal jargon to best describe it:

           element : record
                        data : some_type
                        p1   :pointer_to_element
                        :
                        :
                        pk   :pointer_to_element
                     end;

REM: k is a constant chosen (by me) not bigger than 10.

Catch: the number of pointers 'allocated' to each variable MUST be
       random at the beginning of the program. Any suggestions will be
       appreciated . I wish to be able to (randomly) create structures
       with 3, 5 or 9 pointers for example.
          Please don't propose an array of pointers with a flag randomly
       chosen between 1 and 10.

     Itzik.