Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!unido!rwthinf!cip-s01!pmk
From: pmk@cip-s01.informatik.rwth-aachen.de (Michael Keukert)
Newsgroups: comp.lang.pascal
Subject: Re: Turbo Pascal absolute variables crossing units
Keywords: absolute variables units Borland Turbo Pascal TP4.0
Message-ID: <2013@rwthinf.UUCP>
Date: 20 Jan 90 02:45:54 GMT
References: <3757@mit-caf.MIT.EDU>
Sender: news@rwthinf.UUCP
Reply-To: pmk@cip-s01.UUCP (Michael Keukert)
Organization: Informatik RWTH Aachen
Lines: 38

In article <3757@mit-caf.MIT.EDU> the@mit-caf.UUCP (Siang-Chun The) writes:
>
>	unit outer;
>	interface
>	var
>	   status : integer absolute inner.stat;
>	implementation
>	   (*
>	    * details..
>	    *)
>	end.
>

Try instead:

	UNIT outer;

	INTERFACE

	CONST status:INTEGER = inner.stat;

	IMPLEMENTATION

Doing this, you declare outer.status as a typed constant which means,
this is a "normal" variable but with a defined value within the code.

ABSOLUTE is only valid with a memory-adress for example

       VAR somewhere_in_memory ABSOLUTE $c000:0000;

which means, that the variable somewhere_in_memory contains always
the value in memory-cell $c000:000.

OK?

--------------------------------------------------------------------------
 Michael Keukert, Elsasstrasse 58, D-5100 Aachen 35, Phone: +49 241 513297
 Twenty bucks per day plus expenses, hundred in advance.      (Sam Spade)