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--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                S Y S T E M . F I N A L I Z A T I O N _ R O O T           --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--            Copyright (C) 1992-2005 Free Software Foundation, Inc.        --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
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--  This unit provides the basic support for controlled (finalizable) types
 
with Ada.Streams;
with Unchecked_Conversion;
 
package System.Finalization_Root is
   pragma Preelaborate;
 
   type Root_Controlled;
 
   type Finalizable_Ptr is access all Root_Controlled'Class;
 
   function To_Finalizable_Ptr is
     new Unchecked_Conversion (Address, Finalizable_Ptr);
 
   function To_Addr is
     new Unchecked_Conversion (Finalizable_Ptr, Address);
 
   type Empty_Root_Controlled is abstract tagged null record;
   --  Just for the sake of Controlled equality (see Ada.Finalization)
 
   type Root_Controlled is new Empty_Root_Controlled with record
      Prev, Next : Finalizable_Ptr;
   end record;
   subtype Finalizable is Root_Controlled'Class;
 
   procedure Initialize (Object : in out Root_Controlled);
   procedure Finalize   (Object : in out Root_Controlled);
   procedure Adjust     (Object : in out Root_Controlled);
 
   procedure Write
     (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
      Item   : in Root_Controlled);
 
   procedure Read
     (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
      Item   : out Root_Controlled);
 
   for Root_Controlled'Read use Read;
   for Root_Controlled'Write use Write;
end System.Finalization_Root;