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 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,78609accbfa860fe
X-Google-Attributes: gid103376,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news1.google.com!postnews.google.com!y1g2000pra.googlegroups.com!not-for-mail
From: Graham Stark <graham.stark@virtual-worlds.biz>
Newsgroups: comp.lang.ada
Subject: Re: usefulness of "data hiding"
Date: Sun, 18 Jan 2009 05:07:40 -0800 (PST)
Organization: http://groups.google.com
Message-ID: <c3c50c78-61f5-4961-bc6e-f8dcc71d625e@y1g2000pra.googlegroups.com>
References: 
 <72f07ba4-f06d-44bf-9759-0e6f0d0426d0@h20g2000yqn.googlegroups.com>
	<o029wq1r5hym.1r8ep5ye1ieoi$.dlg@40tude.net>
NNTP-Posting-Host: 86.130.78.66
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1232284061 9198 127.0.0.1 (18 Jan 2009 13:07:41
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Sun, 18 Jan 2009 13:07:41 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: y1g2000pra.googlegroups.com; posting-host=86.130.78.66;
	posting-account=04rmagoAAABZ9PN7u3MdbKIs6DPG57E-
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5)
	Gecko/2008121622 Ubuntu/8.04 (hardy) Firefox/3.0.5
 Ubiquity/0.1.5,gzip(gfe),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:3425
Date: 2009-01-18T05:07:40-08:00
List-Id: <comp.lang.ada>

On Jan 16, 8:57=A0am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Thu, 15 Jan 2009 16:51:38 -0800 (PST), Russ P. wrote:
> > As many of you probably know, Python had no data hiding.
>
> Python is a dynamically typed language. When dynamic typing is considered
> conceptually that inevitably leads you to weak and then to no typing. In =
an
> effectively untyped framework (this includes massive type inference as
> well), you necessarily have to drop encapsulation. There is nothing to
> hide, and nothing can be hidden.
>

There's not much relationship between weak typing and data hiding, is
there?

The least strongly typed language I know of is PHP
($s =3D "x" + 10; is legal, for instance)
but you can have complete encapsulation if you want it:

class A{
    private $a;
    function getA(){ return $this->a; }
    function setA( $a ){ $this->a =3D $a; }
}

and there are strongly typed languages, like Pascal, where you can't
do this at all.

Graham

 > Regards,
> Dmitry A. Kazakovhttp://www.dmitry-kazakov.de