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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Unsigned Integer Restraint Errors
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Date: Mon, 12 Mar 2007 22:13:24 +0100
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On Mon, 12 Mar 2007 20:00:51 +0100, Martin Krischik wrote:

> Dmitry A. Kazakov wrote:
> 
>> 1. Modular types cannot overflow per mathematical definition of. They form
>> a ring closed for +,-,*,/ (except zero divide).
> 
> type Byte is mod 256;
> subtype Half_Byte is Byte range 0 .. 127;

OK, to be pedantic, a subtype of a modular type is not necessary a
"modular" type, because it may lose some properties of. Similarly a subtype
of an integer might be not an "integer" because it might lack the null
element, negative inverses etc. These are classical examples of LSP
problematic.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de