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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--    A D A . C O N T A I N E R S . I N D E F I N I T E _ H O L D E R S     --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--             Copyright (C) 2011, Free Software Foundation, Inc.           --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the  contents of the part following the private keyword. --

--                                                                          --

-- 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

------------------------------------------------------------------------------

private with Ada.Finalization;

private with Ada.Streams;

generic

   type Element_Type (<>) is private;

   with function "=" (Left, Right : Element_Type) return Boolean is <>;

package Ada.Containers.Indefinite_Holders is

   pragma Preelaborate (Indefinite_Holders);

   pragma Remote_Types (Indefinite_Holders);

   type Holder is tagged private;

   pragma Preelaborable_Initialization (Holder);

   Empty_Holder : constant Holder;

   function "=" (Left, Right : Holder) return Boolean;

   function To_Holder (New_Item : Element_Type) return Holder;

   function Is_Empty (Container : Holder) return Boolean;

   procedure Clear (Container : in out Holder);

   function Element (Container : Holder) return Element_Type;

   procedure Replace_Element

     (Container : in out Holder;

      New_Item  : Element_Type);

   procedure Query_Element

     (Container : Holder;

      Process   : not null access procedure (Element : Element_Type));

   procedure Update_Element

     (Container : Holder;

      Process   : not null access procedure (Element : in out Element_Type));

   procedure Assign (Target : in out Holder; Source : Holder);

   function Copy (Source : Holder) return Holder;

   procedure Move (Target : in out Holder; Source : in out Holder);

private

   package AF renames Ada.Finalization;

   type Element_Access is access all Element_Type;

   procedure Read

     (Stream    : not null access Ada.Streams.Root_Stream_Type'Class;

      Container : out Holder);

   procedure Write

     (Stream    : not null access Ada.Streams.Root_Stream_Type'Class;

      Container : Holder);

   type Holder is new Ada.Finalization.Controlled with record

      Element : Element_Access;

      Busy    : Natural := 0;

   end record;

   for Holder'Read use Read;

   for Holder'Write use Write;

   overriding procedure Adjust (Container : in out Holder);

   overriding procedure Finalize (Container : in out Holder);

   Empty_Holder : constant Holder := (AF.Controlled with null, 0);

end Ada.Containers.Indefinite_Holders;