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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Tue, 14 May 2013 15:13:45 +0200
Organization: Ada @ Home
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Xref: news.eternal-september.org comp.lang.ada:15557
Date: 2013-05-14T15:13:45+02:00
List-Id: <comp.lang.ada>

Le Tue, 14 May 2013 14:16:52 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:

> On Tue, 14 May 2013 13:34:09 +0200, Yannick Duch=C3=AAne (Hibou57) wro=
te:
>> An operation has a type,, while a type may be defined without operati=
ons
>> (not a lot useful, however still possible).
>
>    procedure Foo;

This is not random data, this has type. The type is implicit in most cas=
e  =

and becomes more explicit with access to sub=E2=80=91program (the same w=
ith many  =

other languages), and as well=E2=80=91known, there is nothing in Ada loo=
king like  =

an access to an untyped entity, which implies the sub=E2=80=91program ha=
s an  =

implicit type. You just can't dynamically create or manipulate value of =
 =

that type in Ada (unlike with say, SML or other LISP variant), which mak=
es  =

that type special, and prevented it to be given a name, a syntax or ever=
  =

be explicitly referred to in Ada (not the same with all languages).

>> If a program is mainly a structure, then it is mainly made of typed  =

>> values
>> (and the program as a whole, is a complex value).
>
> No idea, what does this mean.
>
> Value is not a programming language term, it belongs to the applicatio=
n
> domain.

Then think about meta=E2=80=91programming or =E2=80=9Cprogramming as a h=
uman activity=E2=80=9D.  =

That said, obviously, the concept of value I referred to, was either at =
a  =

level higher than values manipulated by the program, or else, constants =
 =

values referred to (and interpreted) by the program.


-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity