Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!chaph.usc.edu!aludra.usc.edu!ajayshah
From: ajayshah@aludra.usc.edu (Ajay Shah)
Newsgroups: comp.lang.pascal
Subject: Absolute troubles
Message-ID: <7559@chaph.usc.edu>
Date: 22 Jan 90 19:09:15 GMT
Sender: news@chaph.usc.edu
Reply-To: ajayshah@aludra.usc.edu ()
Organization: University of Southern California, Los Angeles, CA
Lines: 44


Consider this code:

-------------------------Start
type
	VectorType = array[1..10] of real;

procedure xxx(var theta:VectorType);
var
	sigma : real absolute theta;
	beta : VectorType absolute theta[2];
begin
end;
-------------------------End

I'm trying to pass a stacked vector and reference it as two distinct
vectors internally (instead of having code like theta[i+1] to
reference subscript i of beta).  He doesn't let me do this (tp5.5,
i.e.).  The declaration for sigma is fine, the declaration for beta is 
not.

What am i missing?  Is there a fix on the lines of

-------------------------Start
var
	sigma : real absolute theta;
	beta : ^VectorType;
begin
	beta := ptr(theta[2])
end;

-------------------------End

The code above may not be syntactically immaculate (i'm not fluent
with such C-style dirty pointer manipulations). The basic idea is to
declare beta as a pointer, never new it, and just set it to point to
theta[2] and use it as a VectorType.

Ideas on this?

_______________________________________________________________________________
Ajay Shah, (213)747-9991, ajayshah@usc.edu
                              The more things change, the more they stay insane.
_______________________________________________________________________________