From: Mark A Biggar <mark.a.biggar@lmco.com>
Subject: Re: Question for the folks who designed Ada95
Date: 1999/04/29
Date: 1999-04-29T00:00:00+00:00 [thread overview]
Message-ID: <3728D03D.8223B6FC@lmco.com> (raw)
In-Reply-To: 925410775.940.21@news.remarQ.com
Fraser Wilson wrote:
>
> paene lacrimavi postquam Robert Dewar scripsit:
>
> >Now, *without* going to the Ada RM, let's see if we can
> >remember exactly what's going on with the etc here. Hands
> >up those who remember how NOT works on non-binary modular
> >types (hint: the above quote is wrong wrt NOT :-)
>
> not X = Y: X + Y = 0 ?
That works. The RM defines it as (Modulus - X) which is the same value.
> Here's a question: has anyone ever used a modular type which was not
> a power of 2, and lived to tell the tale? What was the context?
Yeah, two different things:
1) the index into a circular queue defined as:
type Queue_index is mod Queue_size;
type Queue is array (Queue_index) of Element;
(Actual implementation was a generic package)
2) Index type for a hash table where table size was largest prime < 32676.
This made the hash function very simple.
Sorry, I can't give detailed code examples as both cases involved code for
classified government projects.
--
Mark Biggar
mark.a.biggar@lmco.com
next prev parent reply other threads:[~1999-04-29 0:00 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-04-26 0:00 Question for the folks who designed Ada95 Corey Ashford
1999-04-27 0:00 ` Matthew Heaney
1999-04-27 0:00 ` Corey Ashford
1999-04-28 0:00 ` Robert A Duff
1999-04-28 0:00 ` Keith Thompson
1999-04-29 0:00 ` Robert A Duff
1999-04-28 0:00 ` Marin David Condic
1999-04-27 0:00 ` Matthew Heaney
1999-04-27 0:00 ` Robert Dewar
1999-04-27 0:00 ` Tarjei Tj�stheim Jensen
1999-04-27 0:00 ` Larry Kilgallen
1999-04-27 0:00 ` David Starner
1999-04-27 0:00 ` Robert Dewar
1999-04-27 0:00 ` David Starner
1999-04-28 0:00 ` Samuel Mize
1999-04-28 0:00 ` Robert Dewar
1999-04-28 0:00 ` Tarjei Tj�stheim Jensen
1999-04-28 0:00 ` Robert A Duff
1999-04-28 0:00 ` Larry Kilgallen
1999-04-28 0:00 ` Robert Dewar
1999-04-28 0:00 ` Robert A Duff
1999-04-29 0:00 ` Tarjei Tj�stheim Jensen
1999-04-29 0:00 ` Bill Ghrist
1999-04-28 0:00 ` dennison
1999-04-28 0:00 ` Robert Dewar
1999-04-28 0:00 ` Robert A Duff
1999-04-28 0:00 ` Brian Hanson
1999-04-28 0:00 ` bill
1999-04-29 0:00 ` Robert Dewar
1999-04-28 0:00 ` Pat Rogers
1999-04-29 0:00 ` Robert Dewar
1999-04-29 0:00 ` dennison
1999-04-29 0:00 ` Pat Rogers
1999-04-29 0:00 ` Robert S. White
1999-04-29 0:00 ` Robert Dewar
1999-04-30 0:00 ` Robert S. White
1999-04-29 0:00 ` Robert Dewar
1999-04-30 0:00 ` Robert S. White
1999-04-30 0:00 ` dennison
1999-04-30 0:00 ` Robert Dewar
1999-04-29 0:00 ` Question for the folks who designed Ad David Kristola
1999-04-29 0:00 ` Paul Duquennoy
1999-04-27 0:00 ` Question for the folks who designed Ada95 Robert Dewar
1999-04-28 0:00 ` Corey Ashford
1999-04-28 0:00 ` Robert Dewar
1999-04-28 0:00 ` Robert A Duff
1999-04-28 0:00 ` Robert Dewar
1999-04-29 0:00 ` Robert A Duff
1999-04-29 0:00 ` Corey Ashford
1999-04-29 0:00 ` Corey Ashford
1999-04-29 0:00 ` Robert Dewar
1999-04-29 0:00 ` Geert Bosch
1999-04-29 0:00 ` Fraser Wilson
1999-04-29 0:00 ` Tucker Taft
1999-04-29 0:00 ` Mark A Biggar [this message]
1999-04-30 0:00 ` Tucker Taft
1999-04-29 0:00 ` Marin David Condic
1999-04-30 0:00 ` David Brown
1999-04-27 0:00 ` bill
1999-04-27 0:00 ` dennison
1999-04-27 0:00 ` Robert Dewar
1999-04-29 0:00 ` Robert A Duff
1999-04-27 0:00 ` Robert Dewar
1999-04-27 0:00 ` Al Christians
1999-04-27 0:00 ` Larry Kilgallen
1999-04-27 0:00 ` Al Christians
1999-04-28 0:00 ` Robert A Duff
1999-04-28 0:00 ` Robert Dewar
1999-04-29 0:00 ` Matthew Heaney
1999-04-29 0:00 ` Jean-Pierre Rosen
1999-04-29 0:00 ` Robert Dewar
1999-04-29 0:00 ` Aidan Skinner
1999-04-30 0:00 ` Matthew Heaney
1999-04-27 0:00 ` Corey Ashford
1999-04-27 0:00 ` Samuel Mize
1999-04-27 0:00 ` Samuel Mize
1999-04-27 0:00 ` Robert Dewar
1999-04-28 0:00 ` Corey Ashford
1999-04-28 0:00 ` Robert Dewar
1999-04-29 0:00 ` Corey Ashford
1999-04-29 0:00 ` Robert Dewar
1999-04-29 0:00 ` Fraser Wilson
1999-04-29 0:00 ` Marin David Condic
1999-04-29 0:00 ` Robert Dewar
1999-04-28 0:00 ` Samuel Mize
1999-04-28 0:00 ` Samuel Mize
1999-04-28 0:00 ` Corey Ashford
1999-04-28 0:00 ` Corey Ashford
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