From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,5f260a1d9f0c280c
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news2.google.com!eweka.nl!lightspeed.eweka.nl!npeer.de.kpn-eurorings.net!npeer-ng2.kpn.DE!newsfeed.arcor.de!newsspool1.arcor-online.net!news.arcor.de.POSTED!not-for-mail
Date: Wed, 27 Aug 2008 11:20:12 +0200
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
User-Agent: Thunderbird 2.0.0.16 (Macintosh/20080707)
MIME-Version: 1.0
Newsgroups: comp.lang.ada
Subject: Re: Common exception handling
References: 
 <88961e92-80a8-4e96-b231-9d67eca0adf5@v26g2000prm.googlegroups.com>
 	<1d1a76fa-a537-4994-9578-7c7604b26ca2@w24g2000prd.googlegroups.com>
 	<e475f941-5d8c-432d-ae90-c41bc8ee2990@r15g2000prh.googlegroups.com>
 	<e9b71aab-1f19-4602-afc7-4420ab8823e3@a3g2000prm.googlegroups.com>
 	<f3921f63-7e3e-409e-b346-f9a62d976f1a@x16g2000prn.googlegroups.com>
 	<ba811359-e5b7-4e06-90e6-479755d9d28c@25g2000prz.googlegroups.com>
 	<3263z19x9l0r.1bbulsb9dbwjm.dlg@40tude.net>
 <02ecfd28-f2f5-4323-962b-e75706e5a48a@1g2000pre.googlegroups.com>
 	<yeiqrb7l5nbc$.6rxfedy8qmir.dlg@40tude.net>
 <62aa47f1-5712-4455-8f2d-8fbc65d12871@25g2000hsx.googlegroups.com>
In-Reply-To: 
 <62aa47f1-5712-4455-8f2d-8fbc65d12871@25g2000hsx.googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Message-ID: <48b51c4c$0$20706$9b4e6d93@newsspool4.arcor-online.net>
Organization: Arcor
NNTP-Posting-Date: 27 Aug 2008 11:20:12 CEST
NNTP-Posting-Host: 7c2b4fdf.newsspool4.arcor-online.net
X-Trace: 
 DXC=nfIJD<TCH3:RLigj];iP=84IUK<Cl32<14Fo<]lROoR1Fl8W>\BH3Y2mb<kVYGU[[0;9OJDO8_SK6NSZ1n^B98i:9^0IP@;G??:
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:7531
Date: 2008-08-27T11:20:12+02:00
List-Id: <comp.lang.ada>

Maciej Sobczak schrieb:
> On 26 Sie, 21:14, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
> wrote:
> 
>> I wished to have ranges of exceptions
> 
> Hierarchies, not ranges.
> 
> The difference is that entities in the hierarchy can be not only
> extended but also specialized and that would nicely fit in the OO part
> of the language.

Meanwhile, using a nested programming language,
we can do

   type Throwable is tagged private;
   ...

   procedure Outer is
      Fail: exception;

      package OO_Exception is
         type Relevant_Info is new Throwable with
            -- everything needed to known what
            -- has happened deep down the call chain
            record
               ...
            end record;
         procedure Prim_Op(Recording: Relevant_Info);

      end OO_Exception;

      package body OO_Exception is separate;
      use OO_Exception;

      procedure Inner is
      begin
         ...
      end Inner;


      Scrap_Book: Relevant_Info;

   begin
      Inner;
   exception
      when Fail =>
         Prim_Op(Scrap_Book);
   end Outer;

--
Georg Bauhaus
Y A Time Drain  http://www.9toX.de