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=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=unavailable autolearn_force=no version=3.4.4
X-Received: by 10.157.61.102 with SMTP id a93mr16247699otc.147.1481057471181;
        Tue, 06 Dec 2016 12:51:11 -0800 (PST)
X-Received: by 10.157.56.132 with SMTP id p4mr4184810otc.20.1481057471134;
 Tue, 06 Dec 2016 12:51:11 -0800 (PST)
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!news.glorb.com!n6no3479097qtd.0!news-out.google.com!j8ni4315qtc.0!nntp.google.com!p16no3478253qta.1!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Tue, 6 Dec 2016 12:51:10 -0800 (PST)
In-Reply-To: <o24oqj$1no2$1@gioia.aioe.org>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=67.0.242.189;
 posting-account=lJ3JNwoAAAAQfH3VV9vttJLkThaxtTfC
NNTP-Posting-Host: 67.0.242.189
References: <c06ee4e6-d616-4e01-ba2e-cb111a81f6f6@googlegroups.com>
 <o1jdgk$tja$1@dont-email.me>
 <92ed75e9-baae-455c-9e34-53348dc6eaef@googlegroups.com>
 <o1kpbo$rni$1@gioia.aioe.org>
 <b777d7e3-4779-4566-b741-8617a9501fd0@googlegroups.com>
 <o1kqk9$tmk$1@gioia.aioe.org>
 <e5adb2c3-f526-4152-9ec9-6e4182e18825@googlegroups.com>
 <o1m2oi$g8l$1@gioia.aioe.org>
 <03847fd7-5699-48de-bb3c-ef5512398f26@googlegroups.com>
 <o1ndod$14ke$1@gioia.aioe.org>
 <3ef819e8-55f7-4ef7-9f37-77e6abc33f98@googlegroups.com>
 <o1oohd$13nu$1@gioia.aioe.org> <o1q81b$9kc$1@franka.jacob-sparre.dk>
 <o1s71b$oi7$1@gioia.aioe.org> <o1sj6s$9vp$1@dont-email.me>
 <o1u6en$1igc$2@gioia.aioe.org> <o1uj70$qe2$1@dont-email.me>
 <o1uroj$jsj$1@gioia.aioe.org>
 <47366b42-c0a3-41bf-a44a-5241c109d60f@googlegroups.com>
 <alpine.DEB.2.20.1612050922450.22845@debian> <o23a8a$11e9$1@gioia.aioe.org>
 <lywpfed43r.fsf@pushface.org>
 <58f477d2-8b01-4001-bad8-47ea73424f4c@googlegroups.com>
 <o24oqj$1no2$1@gioia.aioe.org>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <6e206c3b-d4a8-44ab-9e0e-adb0924983ef@googlegroups.com>
Subject: Re: Ada 2012 Constraints (WRT an Ada IR)
From: Shark8 <onewingedshark@gmail.com>
Injection-Date: Tue, 06 Dec 2016 20:51:11 +0000
Content-Type: text/plain; charset=UTF-8
Xref: news.eternal-september.org comp.lang.ada:32640
Date: 2016-12-06T12:51:10-08:00
List-Id: <comp.lang.ada>

On Monday, December 5, 2016 at 3:13:42 PM UTC-7, Dmitry A. Kazakov wrote:
> On 2016-12-05 19:42, Shark8 wrote:
> 
> > And now we come back full-circle to the topic of the thread:
> >
> >     Subtype P0 is Integer range 1..Integer'Last;
> >     Subtype P3 is Integer with
> >       Static_Predicate  => P3 in 1..Integer'Last,
> >       Predicate_Failure => raise Constraint_Error;
> >
> > are conceptually the same thing
> 
> What makes you think so?
> 
> > Since these are conceptually the same,
> 
> They are not, so long the programmer intentions are unclear. [They also 
> behave differently for some operations].
> 
> P0 is numeric range constraint. It is a well defined mathematical 
> concept the subtype models.
> 
> P1 is an arbitrary predicate supposedly expresses programmer's intention 
> unstated.
> 
> P0 is a contract (contiguous numeric subset) and implementation (built-in)
> 
> P1 is an implementation and no contract.
> 
> -- 
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de

That's funny --- there's no P1 in the post you replied to.