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Date: Sat, 5 Aug 2017 14:29:29 -0700 (PDT)
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Subject: Re: Musing on defining attributes and the ability to define an
 "abstract type X"-interface.
From: Shark8 <onewingedshark@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:47622
Date: 2017-08-05T14:29:29-07:00
List-Id: <comp.lang.ada>

On Saturday, August 5, 2017 at 11:18:44 AM UTC-6, Dmitry A. Kazakov wrote:
> On 2017-08-05 18:51, Shark8 wrote:
>=20
> > This is about having an "abstract type", it's about getting at the
> > underlying interface (general-sense, not OOP-sense)
> First, it is the same sense.  Second, Ada has abstract types (ADT is Ada =
85).

Why do you assert this?
It's demonstrably not the case that it's OOP because, as you point out, Ada=
 83 had the concepts w/o being an OOP language.

As to the second point, ADT is Abstract Data Type -- we're obviously *NOT* =
talking about data here so it doesn't apply... and even if it did, you *sti=
ll* would have to illustrate how and ADT provides the sort of access/unifor=
mity of interface being talked about.

> The point is having hierarchies of types =3D classes.
>=20
> - Ada 85 had built-in classes.
> - Ada 95 added classes of tagged types with representations built by -=20
> record extension.
> - Ada 2005 added classes of siblings sharing null representation (Ada=20
> interfaces).

And this proposal is about adding the ability to extend to the whole langua=
ge without having to depend on (or be restricted to) tagged types.

>=20
> There is a whole world beyond these.

Even within the Ada language there's more here.