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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Quality systems
Date: Thu, 22 May 2003 19:21:46 +0200
Organization: At home
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Date: 2003-05-22T19:21:46+02:00
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Peter Hermann wrote:

> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>> that modular types are associated with unsigned numbers. In my view it
>> would be more consistent to have:
>> type X is mod range -2..4;
> 
> oh noo! please dont open that can of worms with all its intricacies.

Why? Bit-wise operations should be disallowed anyway, I think it is a common 
feeling.

The rest is well-defined:

For any @ = {+, -, *, /} the corresponding operation of a type T can be 
defined as

((a @ b) mod (T'Last - T'First + 1)) + T'First

BTW, I think that ranges should have other semantic for modular types than 
now:

for I in T'(4)..T'(0) loop -- should go through 4, -2, -1, 0

-- 
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de