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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Tue, 14 May 2013 13:34:09 +0200
Organization: Ada @ Home
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Xref: news.eternal-september.org comp.lang.ada:15554
Date: 2013-05-14T13:34:09+02:00
List-Id: <comp.lang.ada>

Le Tue, 14 May 2013 09:44:00 +0200, Dmitry A. Kazakov  =

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

> On Mon, 13 May 2013 21:29:15 -0500, Randy Brukardt wrote:
>
>> The big disconnect is that you (and lots of other misguided people)  =

>> think
>> that types have something to do with operations. Types are more  =

>> fundamental
>> than operations; they get *used* in operations, rather than the  =

>> operations
>> being part of the type.
>
> Neither type nor operation nor value exist before other. You cannot
> separate them. It is like magnetic field and current.

An operation has a type, while a type may be defined without operations =
 =

(not a lot useful, however still possible). The type gets realised even =
 =

before runtime (except for some subtypes), most values too, while an  =

operation, is nothing but a value (with an implicit type) before runtime=
.  =

Values and types, seems to me the most fundamental concept. At least, th=
is  =

looks unavoidable for analysis, which looks at everything, as if it was =
 =

static.

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

(and the program as a whole, is a complex value). Functional programming=
,  =

where even a function is a value, won't say the opposite.

This fact is also what makes the differences between data (hopefully typ=
ed  =

data) and program, narrow, and a matter of interpretation (not that much=
  =

apparent with general purpose languages such as Ada; more apparent with =
 =

domain=E2=80=91specific=E2=80=91languages).


-- =

=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