From: Hyman Rosen <hyrosen@mail.com>
Subject: Re: Typing in Ada
Date: Thu, 17 Jun 2004 08:28:05 -0400
Date: 2004-06-17T08:28:05-04:00 [thread overview]
Message-ID: <1087475285.166449@master.nyc.kbcfp.com> (raw)
In-Reply-To: <Xns950AE3710571Cjimmaureenrogers@204.127.36.1>
James Rogers wrote:
> One important difference between Ada records and C structs is
> in the creation of incomplete types. A C compiler allows the
> creation of incomplete types under the assumption that the
> type will be completed through the linking process, while an
> Ada compiler must have all types completed at compile time.
No, incomplete types in C have nothing to do with linking.
Incomplete types are there for the same reason as in any
other language, so that mutually recursive types may be
declared. Eg.,
struct A;
struct B { struct A *my_A; int x; };
struct A { struct B *my_B; int y; };
For this mutual recursion to be possible, C and C++ must
then identify the places where incomplete types may be used,
such as in declarations of pointers to them, or as function
parameters - basically those places where knowing the innards
of the type is unnecessary.
It is true in C or C++ that if you never have a context in
which you need the complete type, you need not supply it,
even at link time.
next prev parent reply other threads:[~2004-06-17 12:28 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-31 13:32 Typing in Ada Empit
2004-05-31 14:04 ` Poul-Erik Andreasen
2004-05-31 17:01 ` Jeffrey Carter
2004-05-31 20:03 ` Peter C. Chapin
2004-05-31 22:56 ` tmoran
2004-06-01 1:09 ` Peter C. Chapin
2004-06-01 4:40 ` tmoran
2004-06-01 11:26 ` Peter C. Chapin
2004-06-10 3:01 ` Dave Thompson
2004-06-10 3:00 ` Dave Thompson
2004-05-31 23:22 ` Nick Roberts
2004-06-01 1:04 ` Peter C. Chapin
2004-06-01 2:29 ` Nick Roberts
2004-06-02 4:39 ` Robert I. Eachus
2004-06-02 15:17 ` Hyman Rosen
2004-06-01 2:36 ` Hyman Rosen
2004-06-01 4:27 ` Larry Kilgallen
2004-06-01 4:05 ` Hyman Rosen
[not found] ` <d4vnb0tepd4togdrvdrbqpok1ne6n9i2vp@4ax.com>
2004-06-01 14:36 ` Wes Groleau
2004-06-01 20:24 ` Niklas Holsti
2004-06-02 4:43 ` Wes Groleau
2004-06-02 5:28 ` Robert I. Eachus
2004-06-02 8:19 ` tmoran
2004-06-02 14:47 ` Wes Groleau
2004-06-02 11:26 ` Marin David Condic
2004-06-02 14:54 ` gratuitous restrictions (was:Typing in Ada) Wes Groleau
2004-06-02 5:04 ` Typing in Ada Robert I. Eachus
2004-06-01 2:14 ` David C. Hoos
2004-06-02 1:30 ` Jeffrey Carter
2004-06-02 10:53 ` Peter C. Chapin
2004-06-02 11:38 ` Marin David Condic
2004-06-17 2:50 ` Dave Thompson
2004-06-17 4:24 ` James Rogers
2004-06-17 12:28 ` Hyman Rosen [this message]
2004-06-17 23:42 ` James Rogers
2004-06-20 11:27 ` Nick Roberts
2004-06-20 23:29 ` new revision ada Brian May
2004-06-21 2:16 ` tmoran
2004-06-21 2:34 ` James Rogers
2004-06-22 2:16 ` Roland Illig
2004-06-22 3:41 ` James Rogers
2004-06-22 6:53 ` Martin Krischik
2004-06-21 23:33 ` Brian May
2004-06-22 20:26 ` Simon Wright
2004-06-23 0:50 ` Larry Elmore
2004-06-22 22:06 ` tmoran
2004-06-21 5:31 ` Wes Groleau
2004-06-21 12:27 ` new revision ada (limited with, excpetion handling) Nick Roberts
2004-06-21 13:04 ` Martin Dowie
2004-06-22 10:38 ` new revision ada Georg Bauhaus
2004-06-22 12:45 ` James Rogers
2004-06-22 15:17 ` Martin Krischik
2004-06-22 16:09 ` new revision ada (exception handling) Nick Roberts
2004-06-23 7:55 ` Pascal Obry
2004-06-23 8:40 ` Martin Krischik
2004-06-23 19:33 ` Randy Brukardt
2004-06-24 6:57 ` Martin Krischik
2004-06-24 21:13 ` Randy Brukardt
2004-06-25 8:05 ` Dmitry A. Kazakov
2004-06-25 17:28 ` Randy Brukardt
2004-06-23 4:31 ` new revision ada Brian May
2004-06-23 19:47 ` Randy Brukardt
2004-06-22 16:37 ` Georg Bauhaus
2004-06-26 14:57 ` Robert I. Eachus
2004-06-01 1:02 ` Typing in Ada Alexander E. Kopilovich
-- strict thread matches above, loose matches on Subject: below --
2004-06-01 2:11 David C. Hoos, Sr.
2004-06-01 2:13 David C. Hoos, Sr.
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