From: Shark8 <onewingedshark@gmail.com>
Subject: Re: Efficiency of code generated by Ada compilers
Date: Tue, 10 Aug 2010 07:24:40 -0700 (PDT)
Date: 2010-08-10T07:24:40-07:00 [thread overview]
Message-ID: <4c9b83b1-27f5-42cd-b221-8ca72e0a0cb6@y11g2000yqm.googlegroups.com> (raw)
In-Reply-To: 8349c981-4dca-49dc-9189-8ea726234de3@f42g2000yqn.googlegroups.com
On Aug 10, 7:52 am, Elias Salomão Helou Neto <eshn...@gmail.com>
wrote:
> > function Generic_Elliptic_Integral (X : Real; K : Real) return Real is
> > type Internal is digits Real'Digits * 2; -- You cannot do that!
> > begin
> > ...
>
> I don't fully understand the code, but it does seem to be very
> intuitive. What does
>
> type Real is digits <>;
>
> mean? Is "digits" a keyword of the language? I guess Ada groups
> fundamental types in categories and "digits" mean we must use some
> floating point type as the template argument, right? It sounds like a
> good idea, specially if things like that could be done for user
> defined types, i.e., if I can define my own type that "is digits <>".
>
> > --
> > Regards,
> > Dmitry A. Kazakovhttp://www.dmitry-kazakov.de
>
>
"Digits" is a keyword in the language, in particular it is used to
define the number of digits-of-precision in a floating-point type. The
<> in this case is telling the compiler that the type 'Real', which is
the name some floating-point type will be referred to in the generic;
the purpose is to allow the programmer the ability to write code that
is independent of the precision but dependent on the [properties of
the] class of type.
next prev parent reply other threads:[~2010-08-10 14:24 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-06 20:21 Efficiency of code generated by Ada compilers Elias Salomão Helou Neto
2010-08-06 20:24 ` (see below)
2010-08-06 23:14 ` Shark8
2010-08-07 7:53 ` Dmitry A. Kazakov
2010-08-10 13:52 ` Elias Salomão Helou Neto
2010-08-10 14:24 ` Shark8 [this message]
2010-08-10 14:28 ` Shark8
2010-08-10 15:01 ` Robert A Duff
2010-08-10 15:14 ` Yannick Duchêne (Hibou57)
2010-08-10 18:32 ` Robert A Duff
2010-08-10 15:10 ` Georg Bauhaus
2010-08-10 15:32 ` Dmitry A. Kazakov
2010-08-10 22:26 ` Randy Brukardt
2010-08-20 7:22 ` Yannick Duchêne (Hibou57)
2010-08-08 14:03 ` Gene
2010-08-08 15:49 ` Robert A Duff
2010-08-08 17:13 ` Charles H. Sampson
2010-08-08 18:11 ` Dmitry A. Kazakov
2010-08-08 20:51 ` Robert A Duff
2010-08-08 22:10 ` (see below)
2010-08-08 22:22 ` Robert A Duff
2010-08-09 4:46 ` Yannick Duchêne (Hibou57)
2010-08-09 5:52 ` J-P. Rosen
2010-08-09 13:28 ` Robert A Duff
2010-08-09 18:42 ` Jeffrey Carter
2010-08-09 19:05 ` Robert A Duff
2010-08-10 10:00 ` Jacob Sparre Andersen
2010-08-10 12:39 ` Robert A Duff
2010-08-09 19:33 ` Yannick Duchêne (Hibou57)
2010-08-09 21:42 ` Robert A Duff
2010-08-10 12:26 ` Phil Clayton
2010-08-10 12:57 ` Yannick Duchêne (Hibou57)
2010-08-10 14:03 ` Elias Salomão Helou Neto
2010-08-10 14:27 ` Yannick Duchêne (Hibou57)
2010-08-10 22:50 ` anon
2010-08-10 23:28 ` Yannick Duchêne (Hibou57)
2010-08-10 23:38 ` Yannick Duchêne (Hibou57)
2010-08-11 7:06 ` Niklas Holsti
2010-08-11 11:58 ` anon
2010-08-11 12:37 ` Georg Bauhaus
2010-08-11 13:13 ` Robert A Duff
2010-08-11 23:49 ` Randy Brukardt
2010-08-10 14:31 ` Shark8
2010-08-11 7:14 ` Charles H. Sampson
2010-08-11 6:42 ` Charles H. Sampson
2010-08-08 22:35 ` tmoran
2010-08-09 13:53 ` Robert A Duff
2010-08-09 17:59 ` tmoran
2010-08-09 19:36 ` Yannick Duchêne (Hibou57)
2010-08-09 21:38 ` Robert A Duff
2010-08-11 7:42 ` Charles H. Sampson
2010-08-11 13:38 ` Robert A Duff
2010-08-12 7:48 ` Charles H. Sampson
2010-08-12 8:08 ` Ludovic Brenta
2010-08-12 17:10 ` Charles H. Sampson
2010-08-12 18:06 ` Jeffrey Carter
2010-08-11 18:49 ` Simon Wright
2010-08-12 7:54 ` Charles H. Sampson
2010-08-12 8:36 ` Dmitry A. Kazakov
2010-08-12 11:04 ` Brian Drummond
2010-08-12 19:23 ` Simon Wright
2010-08-12 20:21 ` (see below)
2010-08-13 15:08 ` Elias Salomão Helou Neto
2010-08-13 15:10 ` Elias Salomão Helou Neto
2010-08-13 18:01 ` Georg Bauhaus
2010-08-13 19:52 ` Robert A Duff
2010-08-14 9:44 ` Georg Bauhaus
2010-08-13 20:22 ` Robert A Duff
2010-08-14 1:34 ` Randy Brukardt
2010-08-14 7:18 ` anon
2010-08-13 21:57 ` Jeffrey Carter
2010-08-13 22:37 ` Yannick Duchêne (Hibou57)
2010-08-13 22:43 ` Yannick Duchêne (Hibou57)
2010-08-13 23:29 ` tmoran
2010-08-14 0:02 ` Yannick Duchêne (Hibou57)
2010-08-14 0:16 ` (see below)
2010-08-14 10:47 ` Brian Drummond
2010-08-14 13:58 ` Yannick Duchêne (Hibou57)
2010-08-15 0:23 ` Brian Drummond
2010-08-14 14:51 ` (see below)
2010-08-15 0:58 ` Brian Drummond
2010-08-15 1:58 ` (see below)
2010-08-15 10:31 ` Brian Drummond
2010-08-13 15:37 ` Dmitry A. Kazakov
2010-08-16 13:29 ` Elias Salomão Helou Neto
2010-08-16 14:09 ` Dmitry A. Kazakov
2010-08-18 14:00 ` Elias Salomão Helou Neto
2010-08-18 16:38 ` Dmitry A. Kazakov
2010-08-19 18:52 ` Elias Salomão Helou Neto
2010-08-19 19:48 ` Dmitry A. Kazakov
2010-08-13 16:58 ` (see below)
2010-08-14 16:13 ` Charles H. Sampson
2010-08-16 13:45 ` Elias Salomão Helou Neto
2010-08-15 12:32 ` Florian Weimer
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