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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Structured exception information
Date: Mon, 15 Jan 2007 18:22:23 -0500
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2007-01-15T18:22:23-05:00
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"Adam Beneschan" <adam@irvine.com> writes:

>    procedure My_Own_Raise (E : in Ada.Exceptions.Exception_ID;
>                            Info : Extra_Info;
>                            Message : in String := "");
>
> The implementation of this routine would call
> Ada.Exceptions.Raise_Exception(E,Message), and at the same time attach
> "Info" to the exception occurrence, so that another routine in this
> package could retrieve the information from the exception occurrence.
> (Is this the sort of design you had in mind?)

You could have:

    procedure My_Own_Raise (E : in Ada.Exceptions.Exception_ID;
                            Info : Extra_Info);

and the implementation could encode Info as a String, and use that as
the Message passed to Raise_Excpetion.  The handler then decodes the
String.  The stream attributes could be used for encoding/decoding.
Maybe wrapping this mess in some generics could make it more type safe.

Yuck.

- Bob