From: "Robert I. Eachus" <rieachus@earthlink.net>
Subject: Re: friend classes in ada95
Date: 2000/04/29
Date: 2000-04-29T00:00:00+00:00 [thread overview]
Message-ID: <390B0C62.CDF0FDAC@earthlink.net> (raw)
In-Reply-To: m3u2gk6hne.fsf@skinner.demon.co.uk
Aidan Skinner wrote:
> I'd tend to think that an object *shouldn't* be useful unless it's a
> descendent of a more abstract one. I like to have a base class which
> is abstract and then inherit from that, even if I've only got one
> descendant at the time and I don't forsee the need for any more. It
> saves having to rework stuff later.
Hmmm... I like to say that Ada class hierarchies are bushier. It
seems to turn out that if you take, say a Smalltalk class hierarchy and
re-implement it in Ada, you end up with a forest instead of a single
tree (no surprise), and most of the public derivation trees have either
a single entry or a root and a number of child classes. In the private
(implementation) part of the hierarchy there may be intermediate
classes, but unless you are extensively using generic mix-ins, the trees
are still short and fat.
(And yes I am working on a paper on this right now. And the funny
thing is, it ends up recommending mix-ins all over the implementation
space. But the public model is stays sparse, and does not make much use
of multi-level inheritance.)
next prev parent reply other threads:[~2000-04-29 0:00 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-04-14 0:00 friend classes in ada95 Stefan Folkesson
2000-04-14 0:00 ` swhalen
2000-04-14 0:00 ` Florian Weimer
2000-04-14 0:00 ` Stefan Folkesson
2000-04-14 0:00 ` Julian Day
2000-04-14 0:00 ` Steve Folly
2000-04-14 0:00 ` Robert A Duff
2000-04-17 0:00 ` John J. Rusnak
2000-04-18 0:00 ` Vincent Marciante
2000-04-18 0:00 ` John Rusnak
2000-04-18 0:00 ` Steve Folly
2000-04-14 0:00 ` John J. Rusnak
2000-04-15 0:00 ` Jeff Carter
2000-04-16 0:00 ` Robert Dewar
2000-04-16 0:00 ` Jeff Carter
2000-04-16 0:00 ` David Botton
2000-04-17 0:00 ` Robert Dewar
2000-04-17 0:00 ` Hyman Rosen
2000-04-17 0:00 ` Robert Dewar
2000-04-16 0:00 ` David Botton
2000-04-17 0:00 ` Robert Dewar
2000-04-17 0:00 ` David Botton
2000-04-17 0:00 ` David Botton
2000-04-18 0:00 ` friend classes in ada95 (long) tmoran
2000-04-18 0:00 ` David Botton
2000-04-18 0:00 ` friend classes in ada95 Stanley R. Allen
2000-04-19 0:00 ` friend classes in ada95 (long) Brian Rogoff
2000-04-19 0:00 ` Hyman Rosen
2000-04-19 0:00 ` Brian Rogoff
2000-04-23 0:00 ` Hyman Rosen
2000-04-23 0:00 ` Brian Rogoff
2000-04-24 0:00 ` Hyman Rosen
2000-04-25 0:00 ` Brian Rogoff
2000-04-25 0:00 ` Ole-Hjalmar Kristensen
2000-04-19 0:00 ` David Botton
2000-04-19 0:00 ` MI, was Re: friend classes in ada95 tmoran
2000-04-19 0:00 ` David Botton
2000-04-18 0:00 ` Geoff Bull
2000-04-18 0:00 ` Jean-Pierre Rosen
2000-04-18 0:00 ` tmoran
2000-04-18 0:00 ` John J. Rusnak
2000-04-19 0:00 ` Geoff Bull
2000-04-19 0:00 ` Robert Dewar
2000-04-19 0:00 ` David Botton
2000-04-19 0:00 ` Robert Dewar
2000-04-20 0:00 ` Geoff Bull
2000-04-19 0:00 ` Robert Dewar
2000-04-19 0:00 ` Ehud Lamm
2000-04-19 0:00 ` Jeff Susanj
2000-04-19 0:00 ` tmoran
2000-04-19 0:00 ` Robert Dewar
2000-04-19 0:00 ` Jeff Carter
2000-04-19 0:00 ` Ray Blaak
2000-04-20 0:00 ` Jean-Pierre Rosen
2000-04-20 0:00 ` Ray Blaak
2000-04-20 0:00 ` Jean-Pierre Rosen
2000-04-24 0:00 ` Ray Blaak
2000-04-20 0:00 ` Robert Dewar
2000-04-20 0:00 ` BSCrawford
2000-04-20 0:00 ` Jean-Pierre Rosen
2000-04-20 0:00 ` Brian Rogoff
2000-04-20 0:00 ` Robert Dewar
2000-04-20 0:00 ` Ray Blaak
2000-04-20 0:00 ` Charles Hixson
2000-04-21 0:00 ` Jean-Pierre Rosen
2000-04-29 0:00 ` Aidan Skinner
2000-04-29 0:00 ` Robert I. Eachus [this message]
2000-04-21 0:00 ` Jon S Anthony
2000-04-20 0:00 ` Robert Dewar
2000-04-20 0:00 ` Jeff Carter
2000-04-21 0:00 ` Robert Dewar
2000-04-21 0:00 ` Ken Garlington
2000-04-21 0:00 ` Jon S Anthony
2000-04-22 0:00 ` Robert Dewar
2000-04-19 0:00 ` Bill Greene
2000-04-19 0:00 ` Jean-Pierre Rosen
2000-04-19 0:00 ` Robert Dewar
2000-04-18 0:00 ` John Rusnak
2000-04-19 0:00 ` Robert Dewar
2000-04-18 0:00 ` David Botton
2000-04-18 0:00 ` Pascal Obry
2000-04-18 0:00 ` David Botton
2000-04-17 0:00 ` Robert I. Eachus
2000-04-18 0:00 ` Robert Dewar
2000-04-19 0:00 ` Robert I. Eachus
2000-04-20 0:00 ` Robert Dewar
2000-04-20 0:00 ` Ray Blaak
2000-04-23 0:00 ` Robert I. Eachus
2000-04-19 0:00 ` Alfred Hilscher
2000-04-19 0:00 ` Ray Blaak
2000-04-19 0:00 ` Robert Dewar
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