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Date: Sat, 26 Mar 2005 14:55:19 +0100
From: Georg Bauhaus <sb463ba@user1.uni-duisburg.de>
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Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Class hierarchy of exceptions (Ada, C++)
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Date: 2005-03-26T14:54:04+01:00
List-Id: <comp.lang.ada>

Dmitry A. Kazakov wrote:
> On Sat, 26 Mar 2005 11:19:18 +0100, Ludovic Brenta wrote:

>>Perhaps a good middle-ground would be an addition to Ada along the
>>lines of:
>>
>>package Ada.Exceptions.Extra is
>>   type Extra_Information is abstract tagged null record;
>>
>>   procedure Raise_Exception (E : in Exception_Id;
>>                              Information : in Extra_Information'Class);
>>
>>   function Exception_Information (X : Exception_Occurrence)
>>      return Extra_Information'Class;
>>end Ada.Exceptions.Extra;


How about

declare
     ...
     procedure bounce is
     begin
        set_up_information_to_pass;
     end;
begin
    raise with bounce'access;
end;

>>Programs that want to carry rich information with exceptions would be
>>allowed to do so, while "pragma Restrictions (No_Dispatch)" or
>>"No_Dynamic_Allocation" would guarantee, to those interested, that no
>>such thing happens.

> A pair of simple questions: