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From: Alejandro Villanueva <190921@cepsz.unizar.es>
Newsgroups: comp.lang.ada
Subject: Re: First time Ada has let me down
Date: Thu, 26 Oct 2000 20:05:46 +0200
Organization: Universidad de Zaragoza
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Date: 2000-10-26T18:22:56+00:00
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Andreas Schulz wrote:

> Ted Dennison wrote:
> > It also works for modular integer types (Ada95 only) and *arrays* of booleans
> > (which can be packed). Either one will do what you want. But if you also want
> > to work with the data as integers, its silly to do it this way, then have to
> > Unchecked_Convert all over the place. Let the record rep clause do the work
> > for you!
>
> I recently tried something similar to eveluate a slightly more
> complex binary data structure, which ended up as a bunch of
> nested variant records with representation clauses, using almost
> all possible sizes from 1..32 bits. Compiling with GNAT,
> that resulted in several errors like :
> 'fields of "XXX" must start at storage unit boundary'
> Apparently, GNAT doesn't like unaligned variant records, or is there
> any way around that limitation (besides using '/'/mod/and, which
> is how this stuff is handled now) ?

The 'mod is of no use anymore. Ada95 uses 'Alignment.

>
>
> A. Schulz

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