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Newsgroups: comp.lang.ada
Date: Mon, 25 Jun 2018 09:21:36 -0700 (PDT)
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Subject: Re: Ada Successor Language
From: "Dan'l Miller" <optikos@verizon.net>
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Xref: reader02.eternal-september.org comp.lang.ada:53306
Date: 2018-06-25T09:21:36-07:00
List-Id: <comp.lang.ada>

On Monday, June 25, 2018 at 10:19:15 AM UTC-5, Dmitry A. Kazakov wrote:
> On 2018-06-25 16:44, J-P. Rosen wrote:
> > Le 25/06/2018 =C3=A0 16:21, Dmitry A. Kazakov a =C3=A9crit=C2=A0:
>=20
> >> Ada could allow T'Class for untagged T. T'Class would be an indefinite
> >> type with values consisting of the actual type's tag and its value. Wh=
en
> >> T is by-value type, you pass T'Class to a subprogram as tag + value.
> >> When T is by-reference type, you pass tag + reference.
> >>
> >> Upon dispatch, you strip the tag from the value or reference before
> >> passing value/reference down.
> >=20
> > It was a requirement of Ada95 that OOP be strictly contained, and that
> > the same typing system as Ada83 be kept for those who don't want OOP.
>=20
> Don't want OO, don't declare T'Class objects. Where is a problem?

The problem is that you just proposed 'Class for non-OO semantics.  Your pr=
oposal violates the Principal of Least Surprise.