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-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,50137bb64a119cfc
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2003-02-21 12:09:52 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!news-feed.riddles.org.uk!sn-xit-03!sn-xit-06!sn-post-01!supernews.com!corp.supernews.com!not-for-mail
From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: "access constant" discriminant
Date: Fri, 21 Feb 2003 14:07:23 -0600
Organization: Posted via Supernews, http://www.supernews.com
Message-ID: <v5d1sfo9ib2df9@corp.supernews.com>
References: <_TO1a.14664$9y2.6601@nwrddc01.gnilink.net>
 <3CS1a.55972$2H6.1357@sccrnsc04> <3E4E9248.3E71D984@adaworks.com>
 <zwb0dJM87esk@eisner.encompasserve.org> <uu1eyluui.fsf@nasa.gov>
 <1ec946d1.0302201642.66eb93e5@posting.google.com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft Outlook Express 4.72.3612.1700
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3719.2500
X-Complaints-To: abuse@supernews.com
Xref: archiver1.google.com comp.lang.ada:34374
Date: 2003-02-21T14:07:23-06:00
List-Id: <comp.lang.ada>

Matthew Heaney wrote in message
<1ec946d1.0302201642.66eb93e5@posting.google.com>...

>Here we see the reason why we passed an access parameter: it's because
>we're returning an access value that designates one of our own
>components.


That reason being only that Ada doesn't support 'in out' parameters on
functions. If it did,

fuction Persistence_View
     (Object : in out T) return Persistence_Class_Access is
   begin
      return Object.Persistence_View'Access;
   end;

would work fine, and would be a lot easier to use as well.

But that's not going to happen, so we're stuck with terrible workarounds
like 'access' parameters.

             Randy.