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=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail
From: G. B. <nonlegitur@nmhp.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Exception_Occurence and language designers
Date: Tue, 5 Dec 2017 20:05:55 -0000 (UTC)
Organization: A noiseless patient Spider
Message-ID: <p06u73$719$1@dont-email.me>
References: <cf032577-f65e-4ce9-b356-6f70f4c117e7@googlegroups.com>
 <lypo7uptae.fsf@pushface.org>
 <f8e70027-fc10-4412-b6a7-0c55ada9b4b5@googlegroups.com>
 <p03m7u$nip$1@gioia.aioe.org>
 <p04b4d$mr4$1@dont-email.me>
 <p04cnn$5jk$1@gioia.aioe.org>
 <p04ohh$kaa$1@dont-email.me>
 <p05lnv$1p12$1@gioia.aioe.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Tue, 5 Dec 2017 20:05:55 -0000 (UTC)
Injection-Info: reader02.eternal-september.org;
 posting-host="fac5082076c8a981d64c62ae20fe5db6";
	logging-data="7209"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1+mK6eM8A5B5V8ADpbV3uE6LNIL1jr4eCc="
User-Agent: NewsTap/5.3.1 (iPhone/iPod Touch)
Cancel-Lock: sha1:c+OHqVwHc4d1lGkFkVq2dJXKa80=
	sha1:XrMHXTLSzPtXf0yCsCeWDpQmZaE=
Xref: reader02.eternal-september.org comp.lang.ada:49382
Date: 2017-12-05T20:05:55+00:00
List-Id: <comp.lang.ada>

Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
> On 05/12/2017 01:16, G. B. wrote:
>
>> How about this: the idea of creating normal,
>> typed objects as payload of wild jumps in
>> abnormal (exceptional) situations is rather optimistic.
> 
> The problem is upward closures. (...):
> 
> This works in C++ because there all types are global.

Creating objects in exceptional situations,
if meaningfully possible at all, will work in
C++ as long as the programmer manages
to copy the closure of data into the thrown
object, IINM.

>  Root_Exception_Attachment (...)
> 
> Apart from being not very useful and requiring a lot of overhead

If non-local jumps should pass information up the
call chain, then why not ask for a mechanism that
does just that? Trying to load exceptions with this
seems like misusing a concept.