From: Martin Krischik <krischik@users.sourceforge.net>
Subject: Re: Ada Pointer Size Problem
Date: Wed, 13 Oct 2004 10:07:26 +0200
Date: 2004-10-13T10:07:26+02:00 [thread overview]
Message-ID: <219535369.f3yiO4m2UC@linux1.krischik.com> (raw)
In-Reply-To: 35f054ea.0410121044.bf19fea@posting.google.com
skidmarks wrote:
> Stephen Leake <stephen_leake@acm.org> wrote in message
> news:<mailman.269.1097458704.390.comp.lang.ada@ada-france.org>...
>> aschwarz@acm.org (skidmarks) writes:
>
>> > I've looked at the 'info' tex file included with the
>> > gcc distribution and so far have not found how to
>> > change a 64-bit pointer to a 32-bit pointer.
>>
>> Why do you want to do that? A pointer to an integer is not a pointer
>> to a string.
>
> I misspoke, perhaps sarcastically. I don't want to change pointer sizes
> and you have gone far to explain what I'm seeing. Although the reason
> for including the dope vector as part of an Access Type eludes me, the
> explanation I understand. (The elusion is because it seems just as
> reasonable to 'point' to a dope vector when specifying an access type
> rather than including the dope vector as the Access Type.) Albeit,
> thanks to all for the clarification between System.Address and Access
> Type.
Actually the compiler vendors are free to choose the implementation thats
suits them best.
>> > I've thought that maybe I am getting the dope vector size associated
>> > with the String_Ptr but this really doesn't make sense.
>>
>
> See above. To resolve this (type of) difficulty locally - for Ada83
> interfaces to C primarily, we do the following:
>
> A_Access := array'Access
> B_Pointer := array(array'First)'Address
>
> and for the purists, THIS IS NOT TRUE ADA, so don't flame me because
> it's not true Ada.
I use this trick as well from time to time in Ada 95. It's faster and saves
memory.
Even cooler:
type Ada_String is String (1.. C_String_Len);
for Ada_String'Address use C_String'Address;
With Regads
Martin
--
mailto://krischik@users.sourceforge.net
http://www.ada.krischik.com
next prev parent reply other threads:[~2004-10-13 8:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-10 19:50 Ada Pointer Size Problem skidmarks
2004-10-11 1:38 ` Stephen Leake
2004-10-12 18:44 ` skidmarks
2004-10-13 1:23 ` Jeffrey Carter
2004-10-13 8:07 ` Martin Krischik [this message]
2004-10-13 16:27 ` Jean-Pierre Rosen
2004-10-11 5:18 ` Jeffrey Carter
2004-10-21 1:16 ` Dave Thompson
2004-10-21 1:56 ` Jeffrey Carter
2004-10-21 9:54 ` Martin Krischik
2004-10-22 1:09 ` Jeffrey Carter
2004-10-22 7:48 ` Martin Krischik
2004-10-22 9:41 ` Adrien Plisson
2004-10-22 16:50 ` Warren W. Gay VE3WWG
2004-10-24 16:05 ` Martin Krischik
2004-10-23 1:35 ` Jeffrey Carter
2004-10-24 15:52 ` Martin Krischik
2004-10-22 5:41 ` Simon Wright
2004-10-22 18:05 ` Mark Lorenzen
2004-11-01 8:14 ` Dave Thompson
2004-10-11 8:45 ` Martin Krischik
[not found] ` <1c2f5137.0410130505.57e03c@posting.google.com>
2004-10-13 13:37 ` Dmitry A. Kazakov
2004-10-14 3:46 ` Steve
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