Re: Common exception handling

[Georg Bauhaus <rm.dash-bauhaus@futureapps.de>]

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