From: dennison@telepath.com
Subject: Abstract realizations can't be inherited??
Date: 1998/08/27
Date: 1998-08-27T00:00:00+00:00 [thread overview]
Message-ID: <6s491q$usm$1@nnrp1.dejanews.com> (raw)
I had a situation today where I wanted to declare a new tagged type which is
very similar to an existing one I had. Ahh, classic OO. I just derive it from
the existing type, and redefine the one operation that changed, right? Wrong!
The existing type's operations that I wanted to inherit are overrides of
abstract subprograms inherited from its parent type. The compiler blows up
and points to 3.9.3(6), which appears to say that I have to explicitly
override every abstract subprogram any "ancestor" type has. That means that
if a type is declared abstract, none of the "standard" operations you declare
for it can ever be inherited! What on earth is the logic behind that
restriction?
--
T.E.D.
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next reply other threads:[~1998-08-27 0:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-08-27 0:00 dennison [this message]
1998-08-27 0:00 ` Abstract realizations can't be inherited?? Tucker Taft
1998-08-28 0:00 ` dennison
1998-08-29 0:00 ` Tucker Taft
1998-08-31 0:00 ` dennison
1998-08-31 0:00 ` Tucker Taft
1998-08-31 0:00 ` dennison
1998-08-27 0:00 ` dewar
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