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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada 'hello world' for Android; success!
Date: Mon, 7 Nov 2011 21:56:17 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Xref: news1.google.com comp.lang.ada:18851
Date: 2011-11-07T21:56:17-06:00
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message 
news:wccpqhapgr5.fsf@shell01.TheWorld.com...
> Stephen Leake <stephen_leake@stephe-leake.org> writes:
>
>> But in general, the 'super' keyword in Java is a nice feature. There has
>> been discussion of adding that feature to Ada; I forget what the problem
>> was that ended up killing it.
>
> I don't remember, either.  I can't think of any fatal flaws right now.

It wasn't really killed, it's just useless. (I.e., we have Parent_Tag in 
package Ada.Tags, there just isn't a way to use that tag to directly control 
dispatching. *That* we tried to do, but the solutions were all considered 
heavy and not likely to be used. We ended up with the more specialized 
generic dispatching constructor.)

> You would need to deal with the fact that a private type can have
> a different parent from the corresponding full type.

A private type doesn't have a parent, it has an "ancestor". That's probably 
what killed any high-level feature (Ada.Tags ignores privacy, of course, 
it's a runtime thing). There isn't any reasonable way to define the "parent" 
of a private type, and it would be trouble to have the result of T'Parent to 
be different depending on visibility.

                                Randy.