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=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD,
	FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,913ffb3586d7a026
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news2.google.com!postnews.google.com!25g2000yqn.googlegroups.com!not-for-mail
From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: What is the best method for transmitting objects/tagged records?
Date: Tue, 7 Jun 2011 07:19:18 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: <96fa41f6-fe4f-4067-a524-f9e5d94b6137@25g2000yqn.googlegroups.com>
References: <b5077222-5c19-40c0-b038-f15cad7f7daa@s9g2000yqm.googlegroups.com>
 <isk0hd$4v9$1@tornado.tornevall.net>
 <5e5bc0bb-8b39-4655-8c9d-f93ec24b3529@p21g2000yqh.googlegroups.com>
 <isk5mu$2vv$1@munin.nbi.dk>
NNTP-Posting-Host: 24.230.151.194
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1307456358 29841 127.0.0.1 (7 Jun 2011 14:19:18
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Tue, 7 Jun 2011 14:19:18 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: 25g2000yqn.googlegroups.com; posting-host=24.230.151.194;
 posting-account=lJ3JNwoAAAAQfH3VV9vttJLkThaxtTfC
User-Agent: G2/1.0
X-Google-Web-Client: true
X-Google-Header-Order: HUALESNKRC
X-HTTP-UserAgent: Mozilla/5.0 (Windows NT 6.1;
 rv:2.0.1) Gecko/20100101 Firefox/4.0.1,gzip(gfe)
Xref: g2news2.google.com comp.lang.ada:20645
Date: 2011-06-07T07:19:18-07:00
List-Id: <comp.lang.ada>

On Jun 6, 10:25=A0pm, "Randy Brukardt" <ra...@rrsoftware.com> wrote:
> "Shark8" <onewingedsh...@gmail.com> wrote in message
>
> news:5e5bc0bb-8b39-4655-8c9d-f93ec24b3529@p21g2000yqh.googlegroups.com...
>
>
>
>
>
>
>
>
>
> >...
> >"(75)
> > =A0 =A0S'External_Tag
>
> > =A0 =A0 =A0 =A0S'External_Tag denotes an external string representation=
 for
> >S'Tag; it is of the predefined type String. External_Tag may be
> >specified for a specific tagged type via an
> >attribute_definition_clause; the expression of such a clause shall be
> >static. The default external tag representation is implementation
> >defined. See 3.9.2 and 13.13.2."
> >Per
> >http://www.univ-orleans.fr/mapmo/systeme/Recup/systeme/logiciels/GRAS...
>
> >* I had an application that did some working on external tags to check/
> >change the structure a bit; then one day I updated GNAT and, lo and
> >behold, everything there quit working because GNAT's external-tag
> >formatting had been changed.
>
> If you are depending on the format of the external tags, you surely shoul=
d
> not be depending on the default values for external tag for those particu=
lar
> tags. But you can specify these youself, and if you do that compiler won'=
t
> change them. Note that the text you quote says that 'External_Tag can be
> specified.
>
> This is exactly how you stream tagged values -- there too it is a bad ide=
a
> to depend on the default external tags unless everything will always use =
the
> same compiler version everywhere. Specifying the tags is better.
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 Randy.

Good idea. Thank you.