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--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--           ADA.CONTAINERS.RED_BLACK_TREES.GENERIC_SET_OPERATIONS          --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2004-2009, 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 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.                  --

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--  Tree_Type is used to implement ordered containers. This package declares

--  set-based tree operations.

with Ada.Containers.Red_Black_Trees.Generic_Operations;

generic

   with package Tree_Operations is new Generic_Operations (<>);

   use Tree_Operations.Tree_Types;

   with procedure Insert_With_Hint

     (Dst_Tree : in out Tree_Type;

      Dst_Hint : Node_Access;

      Src_Node : Node_Access;

      Dst_Node : out Node_Access);

   with function Copy_Tree (Source_Root : Node_Access)

       return Node_Access;

   with procedure Delete_Tree (X : in out Node_Access);

   with function Is_Less (Left, Right : Node_Access) return Boolean;

   with procedure Free (X : in out Node_Access);

package Ada.Containers.Red_Black_Trees.Generic_Set_Operations is

   pragma Pure;

   procedure Union (Target : in out Tree_Type; Source : Tree_Type);

   --  Attempts to insert each element of Source in Target. If Target is

   --  busy then Program_Error is raised. We say "attempts" here because

   --  if these are unique-element sets, then the insertion should fail

   --  (not insert a new item) when the insertion item from Source is

   --  equivalent to an item already in Target. If these are multisets

   --  then of course the attempt should always succeed.

   function Union (Left, Right : Tree_Type) return Tree_Type;

   --  Makes a copy of Left, and attempts to insert each element of

   --  Right into the copy, then returns the copy.

   procedure Intersection (Target : in out Tree_Type; Source : Tree_Type);

   --  Removes elements from Target that are not equivalent to items in

   --  Source. If Target is busy then Program_Error is raised.

   function Intersection (Left, Right : Tree_Type) return Tree_Type;

   --  Returns a set comprising all the items in Left equivalent to items in

   --  Right.

   procedure Difference (Target : in out Tree_Type; Source : Tree_Type);

   --  Removes elements from Target that are equivalent to items in Source. If

   --  Target is busy then Program_Error is raised.

   function Difference (Left, Right : Tree_Type) return Tree_Type;

   --  Returns a set comprising all the items in Left not equivalent to items

   --  in Right.

   procedure Symmetric_Difference

     (Target : in out Tree_Type;

      Source : Tree_Type);

   --  Removes from Target elements that are equivalent to items in Source, and

   --  inserts into Target items from Source not equivalent elements in

   --  Target. If Target is busy then Program_Error is raised.

   function Symmetric_Difference (Left, Right : Tree_Type) return Tree_Type;

   --  Returns a set comprising the union of the elements in Left not

   --  equivalent to items in Right, and the elements in Right not equivalent

   --  to items in Left.

   function Is_Subset (Subset : Tree_Type; Of_Set : Tree_Type) return Boolean;

   --  Returns False if Subset contains at least one element not equivalent to

   --  any item in Of_Set; returns True otherwise.

   function Overlap (Left, Right : Tree_Type) return Boolean;

   --  Returns True if at least one element of Left is equivalent to an item in

   --  Right; returns False otherwise.

end Ada.Containers.Red_Black_Trees.Generic_Set_Operations;