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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Quality systems (Was: Using Ada for device drivers? (Was: the
   Ada mandate, and why it collapsed and died))
Date: Sat, 24 May 2003 09:33:21 +0200
Organization: At home
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Date: 2003-05-24T09:33:21+02:00
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Robert A Duff wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> 
>> Randy Brukardt wrote:
>> 
>> > Virtually every time I use a modular type, I end up tracking down some
>> > bug at runtime that would have been caught had there been an overflow
>> > check. (Typically in the creation of an array index or the like.) Most
>> > of the these types are 'indexes' (handles) that have to fit in a
>> > particular size, and I often write checks like:
>> >     if Index-1 > 0 then
>> >         Index := Index - 1;
>> >     end if;
>> > which is wrong for a modular type. (Consider Index=0).
>> 
>> But a modular type should have no "<" defined! A transitive "<" is
>> incompatible with modular "+" and "-".
> 
> But I think Randy and I are saying that a type with transitive "<"
> should not have modular semantics.

This or that way (:-))

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