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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) 2004-2012, 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.                  --

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

with Ada.Iterator_Interfaces;

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

   with

      Constant_Indexing => Constant_Reference,

      Variable_Indexing => Reference,

      Default_Iterator  => Iterate,

      Iterator_Element  => Element_Type;

   pragma Preelaborable_Initialization (List);

   type Cursor is private;

   pragma Preelaborable_Initialization (Cursor);

   Empty_List : constant List;

   No_Element : constant Cursor;

   function Has_Element (Position : Cursor) return Boolean;

   package List_Iterator_Interfaces is new

     Ada.Iterator_Interfaces (Cursor, Has_Element);

   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));

   type Constant_Reference_Type

      (Element : not null access constant Element_Type) is private

   with

      Implicit_Dereference => Element;

   type Reference_Type

     (Element : not null access Element_Type) is private

   with

      Implicit_Dereference => Element;

   function Constant_Reference

     (Container : aliased List;

      Position  : Cursor) return Constant_Reference_Type;

   pragma Inline (Constant_Reference);

   function Reference

     (Container : aliased in out List;

      Position  : Cursor) return Reference_Type;

   pragma Inline (Reference);

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

   function Copy (Source : List) return List;

   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);

   function Iterate (Container : List)

      return List_Iterator_Interfaces.Reversible_Iterator'Class;

   function Iterate (Container : List; Start : Cursor)

      return List_Iterator_Interfaces.Reversible_Iterator'Class;

   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;

   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 : aliased Element_Type;

         Next    : Node_Access;

         Prev    : Node_Access;

      end record;

   use Ada.Finalization;

   use Ada.Streams;

   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;

   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 all 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;

   type Reference_Control_Type is

      new Controlled with record

         Container : List_Access;

      end record;

   overriding procedure Adjust (Control : in out Reference_Control_Type);

   pragma Inline (Adjust);

   overriding procedure Finalize (Control : in out Reference_Control_Type);

   pragma Inline (Finalize);

   type Constant_Reference_Type

      (Element : not null access constant Element_Type) is

      record

         Control : Reference_Control_Type;

      end record;

   procedure Write

     (Stream : not null access Root_Stream_Type'Class;

      Item   : Constant_Reference_Type);

   for Constant_Reference_Type'Write use Write;

   procedure Read

     (Stream : not null access Root_Stream_Type'Class;

      Item   : out Constant_Reference_Type);

   for Constant_Reference_Type'Read use Read;

   type Reference_Type

      (Element : not null access Element_Type) is

      record

         Control : Reference_Control_Type;

      end record;

   procedure Write

     (Stream : not null access Root_Stream_Type'Class;

      Item   : Reference_Type);

   for Reference_Type'Write use Write;

   procedure Read

     (Stream : not null access Root_Stream_Type'Class;

      Item   : out Reference_Type);

   for Reference_Type'Read use Read;

   Empty_List : constant List := (Controlled with null, null, 0, 0, 0);

   No_Element : constant Cursor := Cursor'(null, null);

end Ada.Containers.Doubly_Linked_Lists;