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From: "David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>
Newsgroups: comp.lang.ada
Subject: Re: Question about 'valid
Date: Tue, 20 Mar 2001 13:44:04 -0600
Organization: CRC: A wholly owned subsidiary of Thermo Electron
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"Peter Amey" <pna@praxis-cs.co.uk> wrote in message
news:3AB78417.236D1AFF@praxis-cs.co.uk...
>
> Can I ask for the collected wisdom on the following please:
>
> Given X : T;
>
> If X'Valid is true and X is scalar is it always true that:

'Valid is defined ONLY for Scalar types.

>
> X in T;
> X >= T'First;
> X <= T'Last;

Yes
>
> If the answer is yes then is it still true if T is an enumeration type
> with a representation clause which leads to holes in its representation.

Yes.

>
> I am currently very interested in validating aribitrary bit patterns
> that arrive via memory mapped ports and want to really understand the
> role of 'valid in these cases.
>
> TIA
>
> Peter
>
> --
> --------------------------------------------------------------------------
-
>       __         Peter Amey, Product Manager
>         )                    Praxis Critical Systems Ltd
>        /                     20, Manvers Street, Bath, BA1 1PX
>       / 0        Tel: +44 (0)1225 466991
>      (_/         Fax: +44 (0)1225 469006
>                  http://www.praxis-cs.co.uk/
>
> --------------------------------------------------------------------------