From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,705f377a5e04a446
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news1.google.com!news2.google.com!news.glorb.com!peer1.news.newnet.co.uk!194.159.246.34.MISMATCH!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!not-for-mail
From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Bit operations in Ada
Date: Sat, 24 May 2008 16:36:13 +0100
Organization: Pushface
Message-ID: <m2r6brzpci.fsf@mac.com>
References: <g17cct$cup$1@aioe.org> <87wslksmgk.fsf@ludovic-brenta.org>
NNTP-Posting-Host: pogner.demon.co.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: news.demon.co.uk 1211643373 8597 62.49.19.209 (24 May 2008 15:36:13
 GMT)
X-Complaints-To: abuse@demon.net
NNTP-Posting-Date: Sat, 24 May 2008 15:36:13 +0000 (UTC)
Cancel-Lock: sha1:beJT+fvRAU092TEz02lhLqthtqs=
User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (darwin)
Xref: g2news1.google.com comp.lang.ada:325
Date: 2008-05-24T16:36:13+01:00
List-Id: <comp.lang.ada>

Ludovic Brenta <ludovic@ludovic-brenta.org> writes:

> Another alternative is Unchecked_Conversion:
>
> type Bit_Number is range 0 .. 31;
> type Bit_Field is array (Bit_Number) of Boolean;
> pragma Pack (Bit_Field);
> function To_Bit_Field is
>   new Ada.Unchecked_Conversion (Source => Interfaces.Unsigned_32,
>                                 Target => Bit_Field);

Whether this does what you want may depend on whether the machine is
big-endian (eg, SPARC, PowerPC etc) or not (Intel etc).