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: 103376,2a3157e5254b8223
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news2.google.com!postnews.google.com!d77g2000hsb.googlegroups.com!not-for-mail
From: Maciej Sobczak <see.my.homepage@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Array slices and types
Date: Thu, 21 Aug 2008 14:16:20 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: 
 <48b63de7-5990-4612-8129-83d9262587f4@d77g2000hsb.googlegroups.com>
References: <5886ab95-8744-4b72-b911-e4cb8889c7e7@d1g2000hsg.googlegroups.com>
	<1eb141ff-82f8-4969-a525-5e931419d631@1g2000pre.googlegroups.com>
NNTP-Posting-Host: 85.3.252.233
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1219353380 26427 127.0.0.1 (21 Aug 2008 21:16:20
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Thu, 21 Aug 2008 21:16:20 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: d77g2000hsb.googlegroups.com; posting-host=85.3.252.233;
	posting-account=bMuEOQoAAACUUr_ghL3RBIi5neBZ5w_S
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US;
	rv:1.9.0.1) Gecko/2008070206 Firefox/3.0.1,gzip(gfe),gzip(gfe)
Xref: g2news2.google.com comp.lang.ada:7470
Date: 2008-08-21T14:16:20-07:00
List-Id: <comp.lang.ada>

On 20 Sie, 22:45, Adam Beneschan <a...@irvine.com> wrote:

> Do you really need a new *type*, as opposed to:
>
> =A0 =A0subtype Name is String (1 .. 10);
>
> ???

Good question. If I make it a subtype, then I have no protection
against mixing First_Name with Device_Name with File_Name with
Signal_Name with Any_Other_Name - and that would defeat the whole
purpose of defining them.

Consider:

declare

   subtype First_Name is String (1 .. 4);
   subtype Device_Name is String (1 .. 4);

   Someone : First_Name :=3D "Adam";
   Something : Device_Name :=3D "usb1";

begin
   Someone :=3D Something;  -- oops
end;

That's why I was thinking about distinct types. I'm OK with type casts
when assigning them from regular String.

--
Maciej Sobczak * www.msobczak.com * www.inspirel.com

Database Access Library for Ada: www.inspirel.com/soci-ada