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From: "Jean-Pierre Rosen" <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: Endless loop by dispatching
Date: Fri, 11 Jul 2003 11:46:09 +0200
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Date: 2003-07-11T11:46:09+02:00
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"Michael Erdmann" <michael.erdmann@snafu.de> a �crit dans le message de news:un82u-4kb.ln1@boavista.snafu.de...
[SNIP]
> Does any body know, what this loop causes?! I am not sure
> if this is a bug or simply i missed the point.
>
You missed the point :-)

Serialize is a general entry point, which dispatches to Write. If you call it again from Write, it will redispatch
to Write, hence the loop.

Now do you think that Write of B is really Serialize of A, plus something else?
Isn't it *Write* of A, plus something else? If you change your package to

package body B is

    procedure Write(
       This : in Object ) is
    begin
       A.Write( A.Object( This ) );
       Put_Line( "Q =" & Natural'Image(This.Q));
    end Write;

end B;

It will be OK.

Oh, by the way, why do you need Serialize at all? Since all it does is call Write, why don't you
call Write directly?

-- 
---------------------------------------------------------
           J-P. Rosen (rosen@adalog.fr)
Visit Adalog's web site at http://www.adalog.fr