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--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--                 ADA.CONTAINERS.HASH_TABLES.GENERIC_KEYS                  --

--                                                                          --

--                                 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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--  Hash_Table_Type is used to implement hashed containers. This package

--  declares hash-table operations that depend on keys.

generic

   with package HT_Types is

     new Generic_Hash_Table_Types (<>);

   use HT_Types;

   with function Next (Node : Node_Access) return Node_Access;

   with procedure Set_Next

     (Node : Node_Access;

      Next : Node_Access);

   type Key_Type (<>) is limited private;

   with function Hash (Key : Key_Type) return Hash_Type;

   with function Equivalent_Keys

     (Key  : Key_Type;

      Node : Node_Access) return Boolean;

package Ada.Containers.Hash_Tables.Generic_Keys is

   pragma Preelaborate;

   function Index

     (HT  : Hash_Table_Type;

      Key : Key_Type) return Hash_Type;

   pragma Inline (Index);

   --  Returns the bucket number (array index value) for the given key

   procedure Delete_Key_Sans_Free

     (HT  : in out Hash_Table_Type;

      Key : Key_Type;

      X   : out Node_Access);

   --  Removes the node (if any) with the given key from the hash table,

   --  without deallocating it. Program_Error is raised if the hash

   --  table is busy.

   function Find (HT : Hash_Table_Type; Key : Key_Type) return Node_Access;

   --  Returns the node (if any) corresponding to the given key

   generic

      with function New_Node (Next : Node_Access) return Node_Access;

   procedure Generic_Conditional_Insert

     (HT       : in out Hash_Table_Type;

      Key      : Key_Type;

      Node     : out Node_Access;

      Inserted : out Boolean);

   --  Attempts to insert a new node with the given key into the hash table.

   --  If a node with that key already exists in the table, then that node

   --  is returned and Inserted returns False. Otherwise New_Node is called

   --  to allocate a new node, and Inserted returns True. Program_Error is

   --  raised if the hash table is busy.

   generic

      with function Hash (Node : Node_Access) return Hash_Type;

      with procedure Assign (Node : Node_Access; Key : Key_Type);

   procedure Generic_Replace_Element

     (HT   : in out Hash_Table_Type;

      Node : Node_Access;

      Key  : Key_Type);

   --  Assigns Key to Node, possibly changing its equivalence class. If Node

   --  is in the same equivalence class as Key (that is, it's already in the

   --  bucket implied by Key), then if the hash table is locked then

   --  Program_Error is raised; otherwise Assign is called to assign Key to

   --  Node. If Node is in a different bucket from Key, then Program_Error is

   --  raised if the hash table is busy. Otherwise it Assigns Key to Node and

   --  moves the Node from its current bucket to the bucket implied by Key.

   --  Note that it is never proper to assign to Node a key value already

   --  in the map, and so if Key is equivalent to some other node then

   --  Program_Error is raised.

end Ada.Containers.Hash_Tables.Generic_Keys;