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=ham autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,73cb216d191f0fef
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
X-Received: by 10.224.17.140 with SMTP id s12mr2057089qaa.3.1363278161444;
        Thu, 14 Mar 2013 09:22:41 -0700 (PDT)
X-Received: by 10.50.151.205 with SMTP id us13mr3414333igb.2.1363278161266;
 Thu, 14 Mar 2013 09:22:41 -0700 (PDT)
Path: 
 k8ni188qas.0!nntp.google.com!dd2no690240qab.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Thu, 14 Mar 2013 09:22:40 -0700 (PDT)
In-Reply-To: <18r2kop6fyozu.tctrjnghfxqs.dlg@40tude.net>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com;
 posting-host=69.20.190.126;
 posting-account=lJ3JNwoAAAAQfH3VV9vttJLkThaxtTfC
NNTP-Posting-Host: 69.20.190.126
References: <c988e09f-8532-4840-9749-b61aa39551b4@googlegroups.com>
 <wccfw017lkv.fsf@shell01.TheWorld.com>
 <b9c8e444-4fcc-489f-8101-0a2873807987@googlegroups.com>
 <mtz6eyrgv524.r2yf3jw9vid3$.dlg@40tude.net>
 <wccmwu8r0xh.fsf@shell01.TheWorld.com>
 <8klywqh2pf$.1f949flc1xeia.dlg@40tude.net>
 <513f6e2f$0$6572$9b4e6d93@newsspool3.arcor-online.net>
 <b3jec1s37hwu$.bg5cvsul0r5$.dlg@40tude.net>
 <513faaf7$0$6626$9b4e6d93@newsspool2.arcor-online.net>
 <aufd7vornmrk.2dxqrc3egrtg$.dlg@40tude.net> <khphpb$5f1$1@dont-email.me>
 <w46epyd1vjc2.1e1bviaog2kwi$.dlg@40tude.net>
 <51408e81$0$6577$9b4e6d93@newsspool3.arcor-online.net>
 <1xqmd3386hvns.1og1uql2cgnuf$.dlg@40tude.net>
 <5140b812$0$6575$9b4e6d93@newsspool3.arcor-online.net>
 <vxjicagtvzjg.1bcu3fzy711ux$.dlg@40tude.net>
 <5140f1ad$0$6634$9b4e6d93@newsspool2.arcor-online.net>
 <7jct0noryc1v.1rnj5kkzx6m35.dlg@40tude.net>
 <5141c499$0$6642$9b4e6d93@newsspool2.arcor-online.net>
 <18r2kop6fyozu.tctrjnghfxqs.dlg@40tude.net>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <9fdb6a77-aea8-4cb6-aebd-2dd7d3baaefa@googlegroups.com>
Subject: Re: Is this expected behavior or not
From: Shark8 <onewingedshark@gmail.com>
Cc: mailbox@dmitry-kazakov.de
Injection-Date: Thu, 14 Mar 2013 16:22:41 +0000
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Date: 2013-03-14T09:22:40-07:00
List-Id: <comp.lang.ada>

On Thursday, March 14, 2013 8:26:56 AM UTC-6, Dmitry A. Kazakov wrote:
> On Thu, 14 Mar 2013 13:37:44 +0100, Georg Bauhaus wrote:
>=20
> >> We don't talk about Positive'Base. We do about Positive.
> >=20
> > Positive'Succ does *not* declare parameters whose subtype is Positive.
>=20
> Surely it does. Proof:
>=20
>    X : Positive :=3D 1;
>    Y : Positive :=3D Positive'Succ (X);
>=20
> Either Ada is untyped or else Positive'Succ is effectively defined on
> Positive and returns Positive.

Objection!
The LRM says this about Types and Subtypes in 3.2 (8/2):=20

A subtype of a given type is a combination of the type, a constraint on val=
ues of the type, and certain attributes specific to the subtype. The given =
type is called the type of the subtype. Similarly, the associated constrain=
t is called the constraint of the subtype. The set of values of a subtype c=
onsists of the values of its type that satisfy its constraint and any exclu=
sion of the null value. Such values belong to the subtype.

So then the TYPE of Positive is it's base, Integer (even if declared as a s=
ubtype of Natural, precisely because the TYPE of natural would also be Inte=
ger). If the parameters and results of 'Succ & 'Pred are of 'Base then they=
 must obviously be able to take parameters of the given [SUB]TYPE because i=
t's TYPE *is* 'Base.