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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT LIBRARY COMPONENTS                          --
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--                                                                          --
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--                 ADA.CONTAINERS.HASH_TABLES.GENERIC_KEYS                  --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 2004-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- This unit was originally developed by Matthew J Heaney.                  --
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------------------------------------------------------------------------------
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--  Hash_Table_Type is used to implement hashed containers. This package
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--  declares hash-table operations that depend on keys.
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generic
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   with package HT_Types is
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     new Generic_Hash_Table_Types (<>);
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   use HT_Types;
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   with function Next (Node : Node_Access) return Node_Access;
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   with procedure Set_Next
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     (Node : Node_Access;
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      Next : Node_Access);
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   type Key_Type (<>) is limited private;
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   with function Hash (Key : Key_Type) return Hash_Type;
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   with function Equivalent_Keys
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     (Key  : Key_Type;
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      Node : Node_Access) return Boolean;
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package Ada.Containers.Hash_Tables.Generic_Keys is
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   pragma Preelaborate;
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   function Index
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     (HT  : Hash_Table_Type;
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      Key : Key_Type) return Hash_Type;
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   pragma Inline (Index);
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   --  Returns the bucket number (array index value) for the given key
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   procedure Delete_Key_Sans_Free
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     (HT  : in out Hash_Table_Type;
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      Key : Key_Type;
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      X   : out Node_Access);
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   --  Removes the node (if any) with the given key from the hash table,
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   --  without deallocating it. Program_Error is raised if the hash
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   --  table is busy.
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   function Find (HT : Hash_Table_Type; Key : Key_Type) return Node_Access;
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   --  Returns the node (if any) corresponding to the given key
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   generic
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      with function New_Node (Next : Node_Access) return Node_Access;
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   procedure Generic_Conditional_Insert
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     (HT       : in out Hash_Table_Type;
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      Key      : Key_Type;
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      Node     : out Node_Access;
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      Inserted : out Boolean);
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   --  Attempts to insert a new node with the given key into the hash table.
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   --  If a node with that key already exists in the table, then that node
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   --  is returned and Inserted returns False. Otherwise New_Node is called
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   --  to allocate a new node, and Inserted returns True. Program_Error is
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   --  raised if the hash table is busy.
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   generic
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      with function Hash (Node : Node_Access) return Hash_Type;
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      with procedure Assign (Node : Node_Access; Key : Key_Type);
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   procedure Generic_Replace_Element
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     (HT   : in out Hash_Table_Type;
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      Node : Node_Access;
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      Key  : Key_Type);
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   --  Assigns Key to Node, possibly changing its equivalence class. If Node
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   --  is in the same equivalence class as Key (that is, it's already in the
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   --  bucket implied by Key), then if the hash table is locked then
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   --  Program_Error is raised; otherwise Assign is called to assign Key to
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   --  Node. If Node is in a different bucket from Key, then Program_Error is
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   --  raised if the hash table is busy. Otherwise it Assigns Key to Node and
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   --  moves the Node from its current bucket to the bucket implied by Key.
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   --  Note that it is never proper to assign to Node a key value already
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   --  in the map, and so if Key is equivalent to some other node then
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   --  Program_Error is raised.
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end Ada.Containers.Hash_Tables.Generic_Keys;

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