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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Ada 2005 puzzle
Date: Thu, 12 Jul 2012 14:54:08 +0200
Organization: cbb software GmbH
Message-ID: <1arp60wtxes8h$.1qs6bt732ztgp.dlg@40tude.net>
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Date: 2012-07-12T14:54:08+02:00
List-Id: <comp.lang.ada>

Here is a simplified case illustrating an issue with constructing functions
and limited aggregates:

-------------------------------------------- package P
with Ada.Finalization;
package P is
   type T (<>) is new Ada.Finalization.Limited_Controlled with private;
   function Create return T;
private
   type T is new Ada.Finalization.Limited_Controlled with null record;
end P;
- - - - - - - - - - - - - - - - - - - - - - - - 
package body P is
   function Create return T is
   begin
      return (Ada.Finalization.Limited_Controlled with null record);
   end Create;
end P;
-------------------------------------------- package Q
with P;  use P;
package Q is
   type S is abstract new T with null record;
   type R is new S with null record;
   overriding function Create return R;
end Q;
- - - - - - - - - - - - - - - - - - - - - - - - 
package body Q is
   function Create return R is
   begin
      return (T'(Create) with null record); -- Error!
   end Create;
end Q;

Is there a way to implement Create (without compromising the package P)?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de