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--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                       S Y S T E M . P A C K _ 2 1                        --
--                                                                          --
--                                 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, --
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-- 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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--  Handling of packed arrays with Component_Size = 21
 
package System.Pack_21 is
   pragma Preelaborate;
 
   Bits : constant := 21;
 
   type Bits_21 is mod 2 ** Bits;
   for Bits_21'Size use Bits;
 
   function Get_21 (Arr : System.Address; N : Natural) return Bits_21;
   --  Arr is the address of the packed array, N is the zero-based
   --  subscript. This element is extracted and returned.
 
   procedure Set_21 (Arr : System.Address; N : Natural; E : Bits_21);
   --  Arr is the address of the packed array, N is the zero-based
   --  subscript. This element is set to the given value.
 
end System.Pack_21;