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=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,90b27c91e19c3731
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news3.google.com!border1.nntp.dca.giganews.com!border2.nntp.dca.giganews.com!nntp.giganews.com!newspeer1.nwr.nac.net!newspeer.monmouth.com!newsfeed.icl.net!newsfeed.fjserv.net!colt.net!feeder.news-service.com!feed.xsnews.nl!feeder.xsnews.nl!151.189.20.20.MISMATCH!newsfeed.arcor.de!newsspool4.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: I/O streaming with custom data transport
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <ejv4u6$qvu$1@cernne03.cern.ch>
 <17ayrefpaw84a$.2qy8q0wbzzwk.dlg@40tude.net> <ek14pu$k4v$1@cernne03.cern.ch>
Date: Wed, 22 Nov 2006 11:31:15 +0100
Message-ID: <79hvsq397jad.gqs0q79z1smz.dlg@40tude.net>
NNTP-Posting-Date: 22 Nov 2006 11:31:13 CET
NNTP-Posting-Host: 09893bbd.newsspool3.arcor-online.net
X-Trace: 
 DXC=8YCOjDHX_fFk:C4l9A;OcOMcF=Q^Z^V3H4Fo<]lROoRAgUcjd<3m<;BA;PkK19L:TK[6LHn;2LCVN7enW;^6ZC`DF0oL<hNO29K?=Z@_mL2cFA
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:7637
Date: 2006-11-22T11:31:13+01:00
List-Id: <comp.lang.ada>

On Wed, 22 Nov 2006 10:21:02 +0100, Maciej Sobczak wrote:

> I don't understand. The focus here is on foo - which represents the set 
> of functions that can use the stream without really caring what the 
> stream is.

OK, then it is just what Ada calls a class-wide subprogram:

   type My_Abstract_Stream is abstract new Root_Stream_Type ...;

   -- Somewhere else
   procedure Foo (S : in out My_Abstract_Stream'Class);

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de