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Date: Wed, 29 Jan 2003 17:54:02 -0500
From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: Anybody in US using ADA ? One silly idea..
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Date: 2003-01-29T17:54:02-05:00
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Mark Biggar wrote:
> What is going on here is the fundamential paradox of OO systems.

The OO lesson notwithstanding, I still don't see how
anyone thinks they can inherit method implementations
while not inheriting data representations. Aren't the
methods inextricably tied to the data they manipulate?

And this whole "isa" business is just a matter of what
methods the classes implement. A Circle "isa" Ellipse
as long as the interface doesn't include changing the
axes. I think the main problem is that people are
thinking instead of programming. What is going on here
is the fundamental mistake of OO systems, which is
imagining that these things that you are writing in
order to get a computer program to produce a useful
result have all the properties of the things whose
names they bear, rather than the tiny subset which is
implemented.