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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: What is the best method for transmitting objects/tagged records?
Date: Mon, 6 Jun 2011 18:24:25 -0700 (PDT)
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Date: 2011-06-06T18:24:25-07:00
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On Jun 6, 8:11=A0pm, Jeffrey Carter <spam.jrcarter....@spam.not.acm.org>
wrote:
> On 06/06/2011 05:26 PM, Shark8 wrote:
>
>
>
> > So, Dimitry kindly pointed me to the correct way of doing so:
> > - Entry: Read String
> > - Entry: Write Tag
> > - Entry: Write Object over a class-wide variable which had been
> > initialized to the correct type via the dispatching constructor.
>
> > But the package Ada.Tags is of the wrong type/level to be included in
> > a remote_types or remote_interface package, so I cannot use that
> > method.
>
> Possibly use the external tag for communication, converting to a tag at t=
he
> destination?
>
> --
> Jeff Carter
> "I fart in your general direction."
> Monty Python & the Holy Grail
> 05

Well, I can't even WITH Ada.Tags w/o breaking the rules for the DSA
package-pragmas...
and even if I could I'd be somewhat hesitant* because they're
implementation defined:
"(75)
    S'External_Tag

        S'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/GRASP_=
Documentation/ada95lrm/rm9x-13-03.html

* 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.