From: Martin Krischik <martin@krischik.com>
Subject: Re: Ada equivalent for C-pointer?
Date: Sun, 16 Jan 2005 09:44:21 +0100
Date: 2005-01-16T09:44:21+01:00 [thread overview]
Message-ID: <1621573.egxgrGf4Ni@linux1.krischik.com> (raw)
In-Reply-To: gemini.iadas3002srzn02bc.nick.roberts@acm.org
Nick Roberts wrote:
> Pascal Obry <pascal@obry.net> wrote:
>
>> I don't think so. Here Number will be passed by value, no?
>
> No, I don't think so (with GNAT/GCC).
>
>> And you also need the returned value ;)
>
> Yes, oops!
>
>> So, you probably want:
>>
>> function Wibble (Number: access Interfaces.C.int)
>> return Interfaces.C.int;
>>
>> pragma Import(C,Wibble,"wibble");
>
> I think the 'in out' mode would work with GNAT/GCC, but I'd suggest
> testing it to make sure.
I did the testing - it does work
> I suppose using the 'access' mode might be
> clearer, and it might be slightly more efficient.
Anonymous access efficient? If you have a copy read John Barnes Ada 95 (2nd
edition), Page 190, 3rd chapter to end of page.
Yes, I know, it does not apply to export/import C functions.
Martin
--
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com
next prev parent reply other threads:[~2005-01-16 8:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-14 16:41 Ada equivalent for C-pointer? Alfred Hilscher
2005-01-14 17:00 ` Duncan Sands
2005-01-14 20:05 ` tmoran
2005-01-15 5:00 ` Brian May
2005-01-14 22:33 ` Keith Thompson
2005-01-14 23:03 ` Stephen Leake
2005-01-15 15:51 ` Nick Roberts
2005-01-15 18:54 ` tmoran
2005-01-16 1:43 ` Keith Thompson
2005-01-17 21:35 ` Randy Brukardt
2005-01-15 9:09 ` Martin Krischik
2005-01-15 16:03 ` Nick Roberts
2005-01-15 16:27 ` Pascal Obry
2005-01-15 16:50 ` Nick Roberts
2005-01-15 17:11 ` Simon Wright
2005-01-15 18:46 ` Nick Roberts
2005-01-15 17:49 ` Pascal Obry
2005-01-16 8:44 ` Martin Krischik [this message]
2005-01-16 9:58 ` Pascal Obry
2005-01-16 11:07 ` Martin Krischik
2005-01-16 8:36 ` Martin Krischik
2005-01-16 15:01 ` Niklas Holsti
2005-01-16 16:02 ` Martin Krischik
2005-01-17 15:33 ` Niklas Holsti
2005-01-16 20:39 ` Nick Roberts
2005-01-17 21:38 ` Randy Brukardt
2005-01-17 21:45 ` Pascal Obry
2005-01-17 13:11 ` Alfred Hilscher
2005-01-18 7:31 ` Keith Thompson
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