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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
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 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Fri, 10 May 2013 10:12:22 +0200
Organization: Ada @ Home
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Date: 2013-05-10T10:12:22+02:00
List-Id: <comp.lang.ada>

Le Fri, 10 May 2013 09:48:26 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =C3=A9crit:
>> Typing is too rigid to do a good job
>
> Typing is necessarily rigid because

I think he meant something else when he said =E2=80=9Crigid=E2=80=9D. I =
understood he  =

meant =E2=80=9Cnot expressive enough=E2=80=9D, =E2=80=9Cnot always appli=
cable=E2=80=9D. I would say  =

=E2=80=9Climited=E2=80=9D (which is less ambiguous, except in terms of A=
da wordings).

> it is on the next, higher level of
> power. Types describe the behavior of sets of values. Nothing you can =
do
> with individual values could come even close to that, except for trivi=
al
> cases like enumeration types.

To be able to apply types beyond trivial cases, would need to have types=
  =

beyond trivial types. If it is supposed type must be as they already are=
,  =

there is not solution. If it is supposed the concept of type must be  =

defined, I would say it is what holds a set of axioms which will be  =

automatically pulled in a context with each reference to that type.  =

Actually, and except with discriminated records and pre/post condition  =

(which are not statically checked), the only static capability of types,=
  =

is to enumerate a simple list of values and list operations applicable t=
o  =

that list of values. That's indeed too limited except for trivial cases.=


-- =

=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