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From: Nick Roberts <nick.roberts@acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada equivalent for C-pointer?
Date: Sat, 15 Jan 2005 16:50:28 +0000
Message-ID: <gemini.iadas3002srzn02bc.nick.roberts@acm.org>
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Date: 2005-01-15T16:50:28+00:00
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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 suppose using the 'access' mode might be clearer, and it
might be slightly more efficient.

-- 
Nick Roberts