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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT LIBRARY COMPONENTS                          --
--                                                                          --
--   A D A . C O N T A I N E R S . D O U B L Y _ L I N K E D _ L I S T S    --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 2004-2009, 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/>.                                          --
--                                                                          --
-- This unit was originally developed by Matthew J Heaney.                  --
------------------------------------------------------------------------------
 
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.Doubly_Linked_Lists is
   pragma Preelaborate;
   pragma Remote_Types;
 
   type List is tagged private;
   pragma Preelaborable_Initialization (List);
 
   type Cursor is private;
   pragma Preelaborable_Initialization (Cursor);
 
   Empty_List : constant List;
 
   No_Element : constant Cursor;
 
   function "=" (Left, Right : List) return Boolean;
 
   function Length (Container : List) return Count_Type;
 
   function Is_Empty (Container : List) return Boolean;
 
   procedure Clear (Container : in out List);
 
   function Element (Position : Cursor) return Element_Type;
 
   procedure Replace_Element
     (Container : in out List;
      Position  : Cursor;
      New_Item  : Element_Type);
 
   procedure Query_Element
     (Position : Cursor;
      Process  : not null access procedure (Element : Element_Type));
 
   procedure Update_Element
     (Container : in out List;
      Position  : Cursor;
      Process   : not null access procedure (Element : in out Element_Type));
 
   procedure Move
     (Target : in out List;
      Source : in out List);
 
   procedure Insert
     (Container : in out List;
      Before    : Cursor;
      New_Item  : Element_Type;
      Count     : Count_Type := 1);
 
   procedure Insert
     (Container : in out List;
      Before    : Cursor;
      New_Item  : Element_Type;
      Position  : out Cursor;
      Count     : Count_Type := 1);
 
   procedure Insert
     (Container : in out List;
      Before    : Cursor;
      Position  : out Cursor;
      Count     : Count_Type := 1);
 
   procedure Prepend
     (Container : in out List;
      New_Item  : Element_Type;
      Count     : Count_Type := 1);
 
   procedure Append
     (Container : in out List;
      New_Item  : Element_Type;
      Count     : Count_Type := 1);
 
   procedure Delete
     (Container : in out List;
      Position  : in out Cursor;
      Count     : Count_Type := 1);
 
   procedure Delete_First
     (Container : in out List;
      Count     : Count_Type := 1);
 
   procedure Delete_Last
     (Container : in out List;
      Count     : Count_Type := 1);
 
   procedure Reverse_Elements (Container : in out List);
 
   procedure Swap
     (Container : in out List;
      I, J      : Cursor);
 
   procedure Swap_Links
     (Container : in out List;
      I, J      : Cursor);
 
   procedure Splice
     (Target : in out List;
      Before : Cursor;
      Source : in out List);
 
   procedure Splice
     (Target   : in out List;
      Before   : Cursor;
      Source   : in out List;
      Position : in out Cursor);
 
   procedure Splice
     (Container : in out List;
      Before    : Cursor;
      Position  : Cursor);
 
   function First (Container : List) return Cursor;
 
   function First_Element (Container : List) return Element_Type;
 
   function Last (Container : List) return Cursor;
 
   function Last_Element (Container : List) return Element_Type;
 
   function Next (Position : Cursor) return Cursor;
 
   procedure Next (Position : in out Cursor);
 
   function Previous (Position : Cursor) return Cursor;
 
   procedure Previous (Position : in out Cursor);
 
   function Find
     (Container : List;
      Item      : Element_Type;
      Position  : Cursor := No_Element) return Cursor;
 
   function Reverse_Find
     (Container : List;
      Item      : Element_Type;
      Position  : Cursor := No_Element) return Cursor;
 
   function Contains
     (Container : List;
      Item      : Element_Type) return Boolean;
 
   function Has_Element (Position : Cursor) return Boolean;
 
   procedure Iterate
     (Container : List;
      Process   : not null access procedure (Position : Cursor));
 
   procedure Reverse_Iterate
     (Container : List;
      Process   : not null access procedure (Position : Cursor));
 
   generic
      with function "<" (Left, Right : Element_Type) return Boolean is <>;
   package Generic_Sorting is
 
      function Is_Sorted (Container : List) return Boolean;
 
      procedure Sort (Container : in out List);
 
      procedure Merge (Target, Source : in out List);
 
   end Generic_Sorting;
 
private
 
   pragma Inline (Next);
   pragma Inline (Previous);
 
   type Node_Type;
   type Node_Access is access Node_Type;
 
   type Node_Type is
      limited record
         Element : Element_Type;
         Next    : Node_Access;
         Prev    : Node_Access;
      end record;
 
   use Ada.Finalization;
 
   type List is
     new Controlled with record
        First  : Node_Access;
        Last   : Node_Access;
        Length : Count_Type := 0;
        Busy   : Natural := 0;
        Lock   : Natural := 0;
     end record;
 
   overriding
   procedure Adjust (Container : in out List);
 
   overriding
   procedure Finalize (Container : in out List) renames Clear;
 
   use Ada.Streams;
 
   procedure Read
     (Stream : not null access Root_Stream_Type'Class;
      Item   : out List);
 
   for List'Read use Read;
 
   procedure Write
     (Stream : not null access Root_Stream_Type'Class;
      Item   : List);
 
   for List'Write use Write;
 
   type List_Access is access constant List;
   for List_Access'Storage_Size use 0;
 
   type Cursor is
      record
         Container : List_Access;
         Node      : Node_Access;
      end record;
 
   procedure Read
     (Stream : not null access Root_Stream_Type'Class;
      Item   : out Cursor);
 
   for Cursor'Read use Read;
 
   procedure Write
     (Stream : not null access Root_Stream_Type'Class;
      Item   : Cursor);
 
   for Cursor'Write use Write;
 
   Empty_List : constant List := (Controlled with null, null, 0, 0, 0);
 
   No_Element : constant Cursor := Cursor'(null, null);
 
end Ada.Containers.Doubly_Linked_Lists;
 

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