From: jjjensen@cybernet.dk (Jens Jakob Jensen)
Subject: Re: Q. on Automatic Package Finalization
Date: 1996/09/25
Date: 1996-09-25T00:00:00+00:00 [thread overview]
Message-ID: <oBISyExFEStK086yn@cybernet.dk> (raw)
In-Reply-To: dewar.843529239@schonberg
In article <324837B8.2361@watson.ibm.com>,
"Norman H. Cohen" <ncohen@watson.ibm.com> wrote:
[snippety-snip]
>The feature we considered during the 9X design, by the way, was simple,
>succinct, and intuitive: Everywhere Ada allows
>
> begin
> ...
> exception
> ...
> end
>
>we would have allowed
>
> begin
> ...
> exception
> ...
> at end
> < sequence of frame finalization statements >
> end
>
>The semantics would have been the same as the
>
> try { ... } catch { ... } finally { ... }
>
>construct in Java or
>
> TRY
> TRY
> ...
> EXCEPT
> ...
> END
> FINALLY
> ...
> END
>
>in Modula-3: The frame-finalization statements get executed both after
>normal exit from a frame and after execution of an exception handler for
>the frame.
Does this include leaving the frame by return and abort ? I haven't looked
enough into these languages, I'm afraid.
If not, one could do something like:
procedure P is
...
procedure Finalize is
...
end Finalize;
...
begin
...
Finalize;
exception
when ... =>
...
Finalize;
when others =>
Finalize;
raise;
end P;
You have to be really sloppy to miss calling "Finalize" when adding an
exception handler later on. But it _will_ happen, of course...
>Norman H. Cohen
>mailto:ncohen@watson.ibm.com
>http://www.research.ibm.com/people/n/ncohen
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next prev parent reply other threads:[~1996-09-25 0:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-09-22 0:00 Q. on Automatic Package Finalization david scott gibson
1996-09-23 0:00 ` Robert Dewar
1996-09-24 0:00 ` Norman H. Cohen
1996-09-24 0:00 ` Tucker Taft
1996-09-25 0:00 ` Norman H. Cohen
1996-09-25 0:00 ` Jens Jakob Jensen [this message]
-- strict thread matches above, loose matches on Subject: below --
1996-09-28 0:00 Robert Dewar
1996-10-04 0:00 ` Norman H. Cohen
1996-10-06 0:00 ` Robert Dewar
1996-09-28 0:00 Robert Dewar
1996-10-04 0:00 ` Norman H. Cohen
1996-10-04 0:00 ` Robert Dewar
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