From: Martin <martin.dowie@btopenworld.com>
Subject: Re: Reading the while standard input into a String
Date: Fri, 10 Jun 2011 01:22:31 -0700 (PDT)
Date: 2011-06-10T01:22:31-07:00 [thread overview]
Message-ID: <2771e7df-4c09-4eb7-957e-81a2a0bd2f8a@z37g2000yqb.googlegroups.com> (raw)
In-Reply-To: isp559$c2q$1@munin.nbi.dk
On Jun 9, 1:46 am, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> "Niklas Holsti" <niklas.hol...@tidorum.invalid> wrote in message
>
> news:959s61F40sU1@mid.individual.net...
> ...
>
> > The compiler can ignore pragma Pack in the sense that the compiler can
> > allocate memory for the data type in the same was as if there were no
> > pragma Pack. That is, the pragma does not have to result in a smaller
> > memory lay-out. The pragma only asks the compiler to *try* to minimize the
> > size, but the compiler does not have to try very hard... or at all.
>
> > If you want to be sure that pragma Pack has some (desired) effect, you
> > should define the 'Size attribute of the type. If the compiler cannot pack
> > the type into the given size, it must report a compile-time error.
>
> In this particular case, where a specific representation of an array is
> desired, you have to specify 'Component_Size on the array type. Pack doesn't
> necessarily specify a particular representation, and even when it does, it
> is much better to explicitly state that you want 16 bit components (rather
> than just "smaller" components).
>
> In the original example, the type should have been declared:
>
> type Buffer is array (1..32) of Interfaces.Unsigned_16
> with Component_Size => 16;
>
> presuming you have an Ada 2012 compiler. If not, fall back on those ugly
> attribute definition clauses:
>
> type Buffer is array (1..32) of Interfaces.Unsigned_16;
> for Buffer'Component_Size use 16;
>
> (Ugly because you have to repeat the type name and because they can get
> separated from the type.)
>
> Randy.
Randy / Bob,
Thanks for these answers...looking forward to Ada2012 even more
now! :-)
-- Martin
prev parent reply other threads:[~2011-06-10 8:22 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-05 16:20 Reading the while standard input into a String Natasha Kerensikova
2011-06-06 1:49 ` robin
2011-06-06 7:18 ` Dmitry A. Kazakov
2011-06-06 10:46 ` Natasha Kerensikova
2011-06-06 12:05 ` Dmitry A. Kazakov
2011-06-06 16:55 ` Jeffrey Carter
2011-06-06 17:42 ` Pascal Obry
2011-06-06 17:43 ` Pascal Obry
2011-06-06 18:31 ` Dmitry A. Kazakov
2011-06-06 8:09 ` stefan-lucks
2011-06-06 8:33 ` Ludovic Brenta
2011-06-06 10:08 ` Natasha Kerensikova
2011-06-06 10:27 ` Ludovic Brenta
2011-06-06 10:31 ` Ludovic Brenta
2011-06-06 12:07 ` Natasha Kerensikova
2011-06-06 15:18 ` Maciej Sobczak
2011-06-06 18:18 ` Dmitry A. Kazakov
2011-06-06 18:36 ` Maciej Sobczak
2011-06-06 18:53 ` Dmitry A. Kazakov
2011-06-06 19:10 ` J-P. Rosen
2011-06-06 19:46 ` Dmitry A. Kazakov
2011-06-06 23:37 ` Shark8
2011-06-07 3:00 ` Randy Brukardt
2011-06-07 7:25 ` Dmitry A. Kazakov
2011-06-07 7:32 ` Maciej Sobczak
2011-06-07 8:51 ` Dmitry A. Kazakov
2011-06-07 3:10 ` Randy Brukardt
2011-06-06 19:06 ` J-P. Rosen
2011-06-06 19:52 ` Dmitry A. Kazakov
2011-06-07 3:15 ` Randy Brukardt
2011-06-06 22:14 ` Robert A Duff
2011-06-06 9:46 ` Georg Bauhaus
2011-06-06 11:16 ` Georg Bauhaus
2011-06-06 12:11 ` Dmitry A. Kazakov
2011-06-06 13:32 ` Georg Bauhaus
2011-06-06 14:06 ` Dmitry A. Kazakov
2011-06-06 14:14 ` Georg Bauhaus
2011-06-07 3:19 ` Randy Brukardt
2011-06-06 18:14 ` John B. Matthews
2011-06-07 10:23 ` Martin
2011-06-07 16:57 ` John B. Matthews
2011-06-07 17:22 ` Robert A Duff
2011-06-07 17:55 ` John B. Matthews
2011-06-08 0:26 ` Robert A Duff
2011-06-08 7:38 ` Egil Høvik
2011-06-08 9:27 ` Martin
2011-06-08 12:04 ` Egil Høvik
2011-06-08 18:09 ` Niklas Holsti
2011-06-09 0:46 ` Randy Brukardt
2011-06-10 8:22 ` Martin [this message]
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