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From: Stephen Leake <Stephen.A.Leake@nasa.gov>
Newsgroups: comp.lang.ada
Subject: Re: Anybody in US using ADA ? One silly idea..
Date: 30 Jan 2003 12:12:01 -0500
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Date: 2003-01-30T17:25:17+00:00
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Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> writes:

> On Thu, 30 Jan 2003 10:01:18 -0500, Hyman Rosen <hyrosen@mail.com>
> wrote:
> 
> >Dmitry A. Kazakov wrote:
> >> On Wed, 29 Jan 2003 10:44:27 -0500, Hyman Rosen <hyrosen@mail.com>
> >> wrote:
> >>>If you want to inherit method implementation, how can
> >>>this not be tied to object representation?
> >> 
> >> Why should it be? When you do fabs (-100), do you care whether -100
> >> has same represenation as a double?
> >
> >When I *implement* fabs, I most certainly care about the
> >data representation!
> 
> But you don't. It is already here. You just reuse it, because int is
> to some extent a subtype of double.

He said "implement", not "reuse". Please don't confuse the issue.

To _implement_ fabs, you need to know the format of a floating point
number, so you know which bit to flip.

To _implement_ "area" for a circle, you need to know whether it is a
special case of ellipse (so the 'radius' is named 'minor_axis') or is
a separate type (so the 'radius' is named 'radius'). 

Perhaps you can show some code that demonstrates what you are talking
about. 

-- 
-- Stephe