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From: David Thompson <dave.thompson2@verizon.net>
Newsgroups: comp.lang.ada
Subject: Re: How do I write directly to a memory address?
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NNTP-Posting-Date: Mon, 21 Feb 2011 07:17:18 UTC
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Date: Mon, 21 Feb 2011 02:17:37 -0500
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Date: 2011-02-21T02:17:37-05:00
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On Tue, 8 Feb 2011 18:33:46 -0800 (PST), Adam Beneschan
<adam@irvine.com> wrote:

> ... Dmitry asks, "How do you set the third
> bit?", and you say, "Well, if the third bit is a Ready bit in a
> hardware I/O register, I'd define a struct with bit components [yes, I
> think C has those] and just assign 1 to the component, which would be
> more readable than using a mask."  ...

C does have bit-field members of structs, but the standard leaves
implementation-defined whether they go top-to-bottom or bottom-to-top,
and in what size 'storage unit' (NOT the same thing as Ada's).