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From: Martin Krischik <martin@krischik.com>
Newsgroups: comp.lang.ada
Subject: Re: A question re meaning/use of the "for ... use ..."
Date: Sun, 05 Dec 2004 16:47:39 +0100
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Date: 2004-12-05T16:47:39+01:00
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Erik J Pessers wrote:

> Hi,
> 
> A question re meaning/use of the "for ... use ..." construct.
> 
> Given the code snippet at the bottom of this mail, I was sort of
> expecting to see an output reading like:
> 
> Pos for AA : 0
> Pos for BB : 2
> Pos for CC : 3

That is what I would like as well. However the 'Pos( Attribute is defined
differently by the standard.

> Instead (when compiling with bot Gnat3.15p and Gnat-3.4.2-2),
> the actual code output reads:
> 
> Pos for AA : 0
> Pos for BB : 1
> Pos for CC : 2
> 
> 
> Anybody who can shed some light, and explain what will be
> going on behind the curtains?

AFAIK the representation clause sets the internal representation which you
can access with Unchecked_Convertion or which is used for writing to files
and 'Pos will allways return the position regardless of internal
representation.

One of the very very few designs in Ada which I find stupid.

With Regards

Martin
-- 
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