From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Interfacing to C: big structures
Date: Tue, 26 Feb 2008 15:14:36 -0600
Date: 2008-02-26T15:14:36-06:00 [thread overview]
Message-ID: <fq1vnp$kq1$1@jacob-sparre.dk> (raw)
In-Reply-To: m27igr4i0b.fsf@mac.com
"Simon Wright" <simon.j.wright@mac.com> wrote in message
news:m27igr4i0b.fsf@mac.com...
> Adam Beneschan <adam@irvine.com> writes:
>
> > I thought of something like this, but Maciej said something about
> > wanting to avoid dynamic memory, and it seems that you're defining a
> > type whose size isn't going to be known until runtime, and therefore
> > if you declare an Ada variable of that type, it will have to be
> > allocated dynamically in some way.
>
> That was the cunning trick: the size is known at *elaboration* time!
>
> procedure Main_Program is
> type T is Ada.Streams.Stream_Element_Array (1 .. Size_Returned_From_C);
> V : aliased T;
But at least some compilers will allocate V on the heap (under the covers,
of course) because the size of the object is not know at compile-time.
Janus/Ada works this way, for instance. For high-integrity applications,
that's still unacceptable.
But the OP didn't provide enough information to know if this is acceptable
to him or not.
Randy.
next prev parent reply other threads:[~2008-02-26 21:14 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-25 21:17 Interfacing to C: big structures Maciej Sobczak
2008-02-25 23:26 ` Randy Brukardt
2008-02-27 13:23 ` Maciej Sobczak
2008-02-25 23:26 ` Randy Brukardt
2008-02-25 23:26 ` Randy Brukardt
2008-02-25 23:43 ` Robert A Duff
2008-02-26 13:53 ` Stephen Leake
2008-02-26 21:12 ` Randy Brukardt
2008-02-26 2:36 ` Steve
2008-02-26 12:00 ` Alex R. Mosteo
2008-02-26 14:05 ` Robert A Duff
2008-02-26 15:19 ` Alex R. Mosteo
2008-02-26 15:33 ` Robert A Duff
2008-02-26 16:21 ` Alex R. Mosteo
2008-02-27 1:28 ` Robert A Duff
2008-03-10 1:38 ` David Thompson
2008-02-26 17:35 ` Adam Beneschan
2008-02-26 19:47 ` Simon Wright
2008-02-26 21:14 ` Randy Brukardt [this message]
2008-02-27 1:40 ` Robert A Duff
2008-02-27 17:12 ` Adam Beneschan
2008-02-27 20:37 ` Simon Wright
2008-02-28 11:30 ` Alex R. Mosteo
2008-02-28 15:53 ` Robert A Duff
2008-02-29 10:45 ` Alex R. Mosteo
2008-02-27 1:37 ` Robert A Duff
2008-02-27 13:49 ` Maciej Sobczak
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