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From: mojemj@unidhp.uni-c.dk (Mogens Jensen)
Newsgroups: comp.lang.ada
Subject: Why no exception hierarchy ?
Date: 23 Mar 1995 23:10:20 GMT
Organization: News Server at UNI-C,
 Danish Computing Centre for Research and Education.
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Date: 1995-03-23T23:10:20+00:00
List-Id: <comp.lang.ada>

Hi all,
I am, as many others, looking into Ada95. I am currently using C++, and 
am increasingly aware of some more or less serious flaws in the C++ 
language.
  One thing that puzzles me in Ada95 is that exceptions isn't 
hierarchical like in C++ and Delphi (and others, that I don't know of :) 
). This would also help in the Numeric_Error is_a Constraint_Error problem.

As OOP has been built into the language, class hierarchies/libraries will 
be built (or transferred from C++, maybe?); and these will probably throw 
exceptions.
  As far as I can see, a hierarchy of exceptions would help a lot in such 
a library.

What is the rationale for this (I couldn't find it in either the AARM or 
the Rationale).


Greetings from Jens Jakob Jensen, Denmark  (using my fathers account)