From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!mx05.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Seeking for papers about tagged types vs access to subprograms
Date: Sun, 12 May 2013 11:25:51 +0200
Organization: cbb software GmbH
Message-ID: <18iybsmtjt4ay.efhc3ordxiua$.dlg@40tude.net>
References: <op.wv8jh1c1ule2fv@cardamome>
 <p0pf97g5w6xg.jhca6ztjwpde$.dlg@40tude.net> <op.wwq9s4l6ule2fv@cardamome>
 <1bfhq7jo34xpi.p8n2vq6yjsea.dlg@40tude.net> <op.wwrefx1pule2fv@cardamome>
 <cps71yzogw24$.7ol98fxcaurj$.dlg@40tude.net> <op.wwriky0dule2fv@cardamome>
 <nd22gfeezrwf$.tlj4yyygrwq3$.dlg@40tude.net> <kmecg6$et4$1@loke.gir.dk>
 <12gn9wvv1gwfk.10ikfju4rzmnj.dlg@40tude.net> <kmh7d4$up3$1@loke.gir.dk>
 <1oy5rmprgawqs.1jz36okze0xju$.dlg@40tude.net> <kmk45u$v45$1@loke.gir.dk>
 <1q2ql1e4rcgko.diszzq1mhaq8$.dlg@40tude.net> <op.wwwtznpsule2fv@cardamome>
 <1msoad3apbkf.1optea1ujjydv.dlg@40tude.net>
 <wcc61ypi100.fsf@shell01.TheWorld.com>
 <otnq8fecgbel.1itrfodtky6d0.dlg@40tude.net> <op.wwyj4vovule2fv@cardamome>
 <xrlivgfvo6vp.1w3qblmw5gfzr.dlg@40tude.net> <op.wwypinhaule2fv@cardamome>
Reply-To: mailbox@dmitry-kazakov.de
NNTP-Posting-Host: 15waz9CoS+eMakbyhTPyFQ.user.speranza.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
X-Complaints-To: abuse@aioe.org
User-Agent: 40tude_Dialog/2.0.15.1
X-Notice: Filtered by postfilter v. 0.8.2
Xref: news.eternal-september.org comp.lang.ada:15524
Date: 2013-05-12T11:25:51+02:00
List-Id: <comp.lang.ada>

On Sun, 12 May 2013 10:21:49 +0200, Yannick Duchêne (Hibou57) wrote:

> We may diverge here, in short I would say: I don't want bricks giving the  
> illusions I may always be able to use it to build something which may or  
> may not fails, I want bricks which will tell the sooner I will not be able  
> to use it in some invalid ways if I want something which will not fail (or  
> at least reduce potentials for failures, as program proof is more than  
> that).

It is impossible to achieve. It also contradicts the basic principle of
design: divide and conquer. You want bricks to learn architecture? Even if
that were possible such bricks would be unaffordable. And how would you
validate, test, certify such bricks?

> What I don't understand is: how something which give the illusion it has  
> no prerequisites, can help in constructing safer and more trustable  
> architectures?

Simplicity, abstraction, Occam's razor, the principle of minimum energy,
basic customs of engineering etc.

> Seems the invariably `True`  
> precondition wants to give the illusion of universal reuse without  
> conditions.

No, "true" means what that the contract was not a lie. If you say that the
argument of sqrt is Float and another person say that it is not negative,
then somebody is lying here.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de