Message-Id: <199402071359.AA10562@mail.cs.tu-berlin.de>
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In-Reply-To:  <m0pS8CG-0006SGC@rsuna.crn.cogs.susx.ac.uk> (message from Mike
              Piff on Thu, 3 Feb 1994 14:20:23 LCL)
Date:         Mon, 7 Feb 1994 13:54:00 GMT
From: Alan Jeffrey <alanje@COGS.SUSSEX.AC.UK>
Sender: Mailing list for the LaTeX3 project <LATEX-L@DHDURZ1.BITNET>
To: Multiple recipients of list LATEX-L <LATEX-L@DHDURZ1.BITNET>
Subject:      Re: On the death of \footheight
Status: R

>How about "virtual dimen"s, that only get defined when the user needs them,
>for instance, when assigning to them?

Problem is that this only works if the first use of the dimen is an
assignment.  If it is to read from the dimen, you get a `Missing
number, treated as zero' error.  It may be possible to code round
this, but I wouldn't like to bet on it :-)

Alan.

Alan Jeffrey         Tel: +44 273 606755 x 3238         alanje@cogs.susx.ac.uk
School of Cognitive and Computing Sciences, Sussex Univ., Brighton BN1 9QH, UK