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Date: Tue, 26 Jun 2018 07:42:23 -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:53330
Date: 2018-06-26T07:42:23-07:00
List-Id: <comp.lang.ada>

On Tuesday, June 26, 2018 at 9:17:02 AM UTC-5, Dmitry A. Kazakov wrote:
> On 2018-06-26 15:59, Dan'l Miller wrote:
> > On Tuesday, June 26, 2018 at 2:44:26 AM UTC-5, Dmitry A. Kazakov wrote:
> >> On 2018-06-25 18:21, Dan'l Miller wrote:
> >>> On Monday, June 25, 2018 at 10:19:15 AM UTC-5, Dmitry A. Kazakov wrot=
e:
> >>>> 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:
> >>>>
> >>>>>> Ada could allow T'Class for untagged T. T'Class would be an indefi=
nite
> >>>>>> type with values consisting of the actual type's tag and its value=
. When
> >>>>>> T is by-value type, you pass T'Class to a subprogram as tag + valu=
e.
> >>>>>> When T is by-reference type, you pass tag + reference.
> >>>>>>
> >>>>>> Upon dispatch, you strip the tag from the value or reference befor=
e
> >>>>>> passing value/reference down.
> >>>>>
> >>>>> It was a requirement of Ada95 that OOP be strictly contained, and t=
hat
> >>>>> the same typing system as Ada83 be kept for those who don't want OO=
P.
> >>>>
> >>>> 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.  Y=
our proposal violates the Principal of Least Surprise.
> >>
> >> Remember, Ada is a strongly typed language, T'Class is not T, there is
> >> no way it could break or change anything in T.
> >=20
> > Quit putting non sequitur words in my mouth.  I never said that it woul=
d break anything in T.  I said that it would break T'Class in =E2=80=A2some=
=E2=80=A2 situations of the untagged extended records,
>=20
> Such situations are strictly non-existent for neither T'Class nor record=
=20
> extensions are presently allowed for non-tagged types.

And yet, you propose them.