From: george.priv@gmail.com
Subject: Re: another way to shoot yourself in the foot?
Date: Mon, 23 Jun 2008 21:02:29 -0700 (PDT)
Date: 2008-06-23T21:02:29-07:00 [thread overview]
Message-ID: <21d80cc3-a3fb-49f5-a46e-6056bbef2ba7@y21g2000hsf.googlegroups.com> (raw)
In-Reply-To: 12dhu8e1w5ac9.1s9hzkf9d2rsy$.dlg@40tude.net
On Jun 23, 3:49 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Sun, 22 Jun 2008 16:44:08 -0400, Robert A Duff wrote:
> > I don't see that as a problem, and anyway, the same thing can happen
> > with the existing syntax:
>
> > function Foo (...) return String is
> > begin
> > return Result : String (1..200) do -- Going to return 200 characters
> > Result (1) := 'a'; -- Here the result has to be allocated
> > if HALT (x) then
> > goto Label;
> > end if;
> > end; -- Drop already allocated and initialized result
> > <<Label>>
> > return "Hallo!"; -- Return a completely different thing
> > end Foo;
>
> > The implementation of this is "interesting" (if we replace String by a
> > build-in-place type). ;-)
>
> How much interesting is it? (:-))
>
> Unfortunately the following crazy sample crashes GNAT, but I wonder what
> could be the result if it compiled:
>
> procedure Return_Task is
> Just_For_Fun : exception;
>
> task type T is
> entry A;
> end T;
>
> task body T is
> begin
> accept A;
> end T;
>
> function Interesting return T is
> begin
> return X : T do
> raise Just_For_Fun;
> end return;
> exception
> when Just_For_Fun =>
> return X : T;
> end Interesting;
>
> X : T := Interesting;
> begin
> X.A;
> end Return_Task;
>
> Should it block?
>
> Another question is about the semantics such stuff. In which sense in-place
> is it? It seems that an in-place initialization might result in n
> finalizations and n+1 initializations (n>=0) of the same thing.
>
> --
> Regards,
> Dmitry A. Kazakovhttp://www.dmitry-kazakov.de
Aren't tasks limited types by definitions? In which case compiler
should be giving error message..
next prev parent reply other threads:[~2008-06-24 4:02 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-20 9:03 another way to shoot yourself in the foot? fedya_fedyakoff
2008-06-20 9:34 ` Dmitry A. Kazakov
2008-06-20 9:48 ` fedya_fedyakoff
2008-06-20 10:01 ` Ludovic Brenta
2008-06-20 10:05 ` christoph.grein
2008-06-20 10:26 ` Dmitry A. Kazakov
2008-06-20 16:12 ` Adam Beneschan
2008-06-20 15:48 ` Adam Beneschan
2008-06-20 19:27 ` Robert A Duff
2008-06-20 23:37 ` Jeffrey R. Carter
2008-06-21 8:56 ` Dmitry A. Kazakov
2008-06-22 20:44 ` Robert A Duff
2008-06-23 7:49 ` Dmitry A. Kazakov
2008-06-24 4:02 ` george.priv [this message]
2008-06-24 7:30 ` Dmitry A. Kazakov
2008-06-24 17:16 ` Robert A Duff
2008-06-24 19:15 ` Jeffrey R. Carter
2008-06-24 20:31 ` Robert A Duff
2008-06-24 20:50 ` Ludovic Brenta
2008-06-24 23:02 ` Robert A Duff
2008-06-24 23:42 ` Georg Bauhaus
2008-06-24 21:24 ` Jeffrey R. Carter
2008-06-24 23:24 ` Robert A Duff
2008-06-25 15:07 ` Adam Beneschan
2008-06-24 14:59 ` Adam Beneschan
2008-06-24 16:41 ` Dmitry A. Kazakov
2008-06-24 17:20 ` Robert A Duff
2008-06-24 17:52 ` Dmitry A. Kazakov
2008-06-24 23:35 ` Georg Bauhaus
2008-06-25 8:09 ` Dmitry A. Kazakov
2008-06-25 10:32 ` Georg Bauhaus
2008-06-25 12:06 ` Dmitry A. Kazakov
2008-06-22 20:37 ` Robert A Duff
2008-06-22 21:25 ` Jeffrey R. Carter
2008-07-04 20:52 ` Colin Paul Gloster
2008-07-04 22:15 ` (see below)
2008-07-05 16:06 ` Colin Paul Gloster
2008-07-05 13:38 ` Gary Scott
2008-07-05 16:42 ` Colin Paul Gloster
2008-07-05 19:00 ` Gary Scott
2008-07-09 19:39 ` Colin Paul Gloster
2008-07-09 20:35 ` Richard Maine
2008-07-09 22:49 ` Terence
2008-07-10 1:07 ` Gary Scott
2008-07-10 14:10 ` Colin Paul Gloster
2008-07-10 14:57 ` fj
2008-07-10 16:47 ` Richard Maine
2008-07-10 17:03 ` Dick Hendrickson
2008-07-10 17:26 ` Craig Powers
2008-07-10 19:55 ` James Giles
2008-07-10 20:45 ` Dick Hendrickson
2008-07-10 21:22 ` Richard Maine
2008-07-10 21:29 ` Craig Powers
2008-07-10 20:45 ` Craig Powers
2008-07-10 19:51 ` James Giles
2008-07-11 15:02 ` Colin Paul Gloster
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