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From: christoph.grein@eurocopter.com
Newsgroups: comp.lang.ada
Subject: Re: The A-Z of Programming Languages: Ada, interview with S. Tucker
	Taft
Date: Thu, 12 Jun 2008 00:25:25 -0700 (PDT)
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On 12 Jun., 03:57, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> I personally thought that using derived types (which no one understood in
> Ada 83)

What do you mean? I used type derivation a lot in Ada 83 with much
benefit for handling physical types adding new operations on the
derived type.

And there is the trick attributed to John Goodenough to add user-
defined equality to any type.

> to implement classes was a mistake. Tucker was adamant on this
> point. I'm still not sure if he was right, but I'm used to it now.

Why this? I think that using the Ada 83 type derivation facility for
this is very natural. Why invent a completely new technique?