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=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD,
	FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,640b65cbfbab7216
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!postnews.google.com!k1g2000prb.googlegroups.com!not-for-mail
From: Eric Hughes <eric.eh9@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada.Strings.Bounded
Date: Mon, 14 Apr 2008 08:25:41 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: <927bd9bc-1de1-44ae-ae20-35c1cc599d17@k1g2000prb.googlegroups.com>
References: <q5CdnepU0ZzTxmzanZ2dnUVZ_t-nnZ2d@earthlink.com>
	<47F26C46.3010607@obry.net> <oYSdnZzY7_T8P2_anZ2dnUVZ_uGknZ2d@earthlink.com>
	<44d88b93-6a90-4c18-8785-2164934ba700@a9g2000prl.googlegroups.com>
	<47F652F7.9050502@obry.net>
 <d478eba3-b8d5-4727-bdd6-2fd68c341427@n1g2000prb.googlegroups.com>
	<e29ab2eb-4d08-4f15-96b4-de8318a94bab@1g2000prg.googlegroups.com>
	<47f7028d$1_6@news.bluewin.ch> <47F749CB.30806@obry.net>
 <f10fbaff-0546-4c3f-9d62-267bbdcea7ea@w4g2000prd.googlegroups.com>
	<480111a5$0$23695$9b4e6d93@newsspool2.arcor-online.net>
 <5d94b37c-20cd-46cf-b4c9-94bd2047c438@b5g2000pri.googlegroups.com>
	<wccmynx4itf.fsf@shell01.TheWorld.com>
 <0a2bbbb1-19d8-41d3-84a0-321cd045a48b@1g2000prf.googlegroups.com>
	<1oezq4ijzah23.18y7fwriuqe6s.dlg@40tude.net>
NNTP-Posting-Host: 166.70.57.218
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: posting.google.com 1208186741 18226 127.0.0.1 (14 Apr 2008 15:25:41
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 14 Apr 2008 15:25:41 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: k1g2000prb.googlegroups.com; posting-host=166.70.57.218;
	posting-account=5RIiTwoAAACt_Eu87gmPAJMoMTeMz-rn
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
 rv:1.8.1.13)
	Gecko/20080311 Firefox/2.0.0.13,gzip(gfe),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:20937
Date: 2008-04-14T08:25:41-07:00
List-Id: <comp.lang.ada>

On Apr 14, 2:00 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> If we had universal_string, it would have no assignment anyway, because all
> universal objects are immutable.

Sure, because you can't declare a variable of a universal type.  But
this critique misses the point, which is about the relationship of
types that partially implement a universal type.

> There is a difference between types and their constrained subtypes in terms
> of substitutability. That's why the language has Constraint_Error defined.
> The contracts extended by Constraint_Error aren't violated and everything
> is fine.

Sure, but again not the point.  The relationship between a universal
type and an implemented type is NOT the same as that between two
implemented types.

Eric