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MathGroup Archive 1991

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Re: data structure equivalent ops

  • To: mathgroup at yoda.ncsa.uiuc.edu, davidd at cs.washington.edu (David Doll)
  • Subject: Re: data structure equivalent ops
  • From: jacobson at cello.hpl.hp.com
  • Date: Fri, 22 Feb 91 08:41:42 PST

If you really need pointer functionality, you can hack it by creating
new symbols.  For example, suppose you want a record with components
x, y, and link, where link "points to" another such record.

You allocate the record like this

	name = Unique[]

	name[] = {xexpression,yexpressioin,someothername}

You dereference with

	somename[]

You can automatically get the functionality of lisp property lists by just

	name[propertyname] = ...

  -- David Jacobson
P.S. I haven't actually tried the above code.







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