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: 103376,93d7def3eeefbc26
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!postnews.google.com!z14g2000cwz.googlegroups.com!not-for-mail
From: danmcleran@hotmail.com
Newsgroups: comp.lang.ada
Subject: Re: Private area and child packages
Date: 30 Dec 2004 07:31:48 -0800
Organization: http://groups.google.com
Message-ID: <1104420708.559607.11230@z14g2000cwz.googlegroups.com>
References: <1104293158.276241.42640@f14g2000cwb.googlegroups.com>
   <aHqAd.11670$RH4.11125@newsread1.news.pas.earthlink.net>
NNTP-Posting-Host: 172.157.129.68
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
X-Trace: posting.google.com 1104420747 16205 127.0.0.1 (30 Dec 2004 15:32:27
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Thu, 30 Dec 2004 15:32:27 +0000 (UTC)
User-Agent: G2/0.2
Complaints-To: groups-abuse@google.com
Injection-Info: z14g2000cwz.googlegroups.com; posting-host=172.157.129.68;
   posting-account=LSix6gsAAACmBFWMCbh6syCaua0lawvj
Xref: g2news1.google.com comp.lang.ada:7326
Date: 2004-12-30T07:31:48-08:00
List-Id: <comp.lang.ada>

What about using Ada's Limited_Controlled type? Then, since no copies
could be made, I could do something like this:

with Ada.Finalization;

package Some_Package is
type Secret_Type is tagged limited private;
private
type Implementation_Type;
type Implementation_Access_Type is access Implementation_Type;
type Secret_Type is new Ada.Finalization.Limited_Controlled with
record
Implementation_Access : Implementation_Access_Type := null;
end record;   
end Some_Package;