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: 103376,29c1212970bb6877
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: g2news1.google.com!postnews.google.com!not-for-mail
From: aschwarz@acm.org (skidmarks)
Newsgroups: comp.lang.ada
Subject: Re: String Pointer Bug
Date: 9 Nov 2004 08:47:19 -0800
Organization: http://groups.google.com
Message-ID: <35f054ea.0411090847.668b8d4e@posting.google.com>
References: <mailman.83.1099920902.10401.comp.lang.ada@ada-france.org>
NNTP-Posting-Host: 199.46.200.230
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: posting.google.com 1100018840 27438 127.0.0.1 (9 Nov 2004 16:47:20
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Tue, 9 Nov 2004 16:47:20 +0000 (UTC)
Xref: g2news1.google.com comp.lang.ada:6083
Date: 2004-11-09T08:47:19-08:00
List-Id: <comp.lang.ada>

"Christoph Karl Walter Grein" <AdaMagica@web.de> wrote in message news:<mailman.83.1099920902.10401.comp.lang.ada@ada-france.org>...
> A long time ago, I made an exegesis of this problem. You may find it below
> (sorry if the indentation should be lost, it's my mailer that swallows it, I do not know
> to avoid this):

Thank you. This is an excellent description. the only (fault) that I
can see is that it requires a copy operation (Y: aliased D := X).

I wonder, do you think that:

   Y: aliased D; for Y'Address use X'Address;

is a viable alternative (please note, I did not say GOOD alternative).

In this simple case, a copy serves no harm, other than some time. But
if the data is large the cost will certainly grow, perhaps to being
unacceptable.

Another (but unattractive) alternative might be:

    type S1 is String(1..1);
    type S2 is String(1..2);
             ooo
    type Sn is String(1..n);

    type S_Ptr  is access all String;
    type S1_Ptr is access all S1;
             ooo
    type Sn_Ptr is access all Sn;


and so on. But how really ugly.

thanks

art