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--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--              ADA.CONTAINERS.HASH_TABLES.GENERIC_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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--  Hash_Table_Type is used to implement hashed containers. This package

--  declares hash-table operations that do not depend on keys.

with Ada.Streams;

generic

   with package HT_Types is

     new Generic_Hash_Table_Types (<>);

   use HT_Types;

   with function Hash_Node (Node : Node_Access) return Hash_Type;

   with function Next (Node : Node_Access) return Node_Access;

   with procedure Set_Next

     (Node : Node_Access;

      Next : Node_Access);

    with function Copy_Node (Source : Node_Access) return Node_Access;

   with procedure Free (X : in out Node_Access);

package Ada.Containers.Hash_Tables.Generic_Operations is

   pragma Preelaborate;

   procedure Free_Hash_Table (Buckets : in out Buckets_Access);

   --  First frees the nodes in all non-null buckets of Buckets, and then frees

   --  the Buckets array itself.

   function Index

     (Buckets : Buckets_Type;

      Node    : Node_Access) return Hash_Type;

   pragma Inline (Index);

   --  Uses the hash value of Node to compute its Buckets array index

   function Index

     (Hash_Table : Hash_Table_Type;

      Node       : Node_Access) return Hash_Type;

   pragma Inline (Index);

   --  Uses the hash value of Node to compute its Hash_Table buckets array

   --  index.

   procedure Adjust (HT : in out Hash_Table_Type);

   --  Used to implement controlled Adjust. It is assumed that HT has the value

   --  of the bit-wise copy that immediately follows controlled Finalize.

   --  Adjust first allocates a new buckets array for HT (having the same

   --  length as the source), and then allocates a copy of each node of source.

   procedure Finalize (HT : in out Hash_Table_Type);

   --  Used to implement controlled Finalize. It first calls Clear to

   --  deallocate any remaining nodes, and then deallocates the buckets array.

   generic

      with function Find

        (HT  : Hash_Table_Type;

         Key : Node_Access) return Boolean;

   function Generic_Equal

     (L, R : Hash_Table_Type) return Boolean;

   --  Used to implement hashed container equality. For each node in hash table

   --  L, it calls Find to search for an equivalent item in hash table R. If

   --  Find returns False for any node then Generic_Equal terminates

   --  immediately and returns False. Otherwise if Find returns True for every

   --  node then Generic_Equal returns True.

   procedure Clear (HT : in out Hash_Table_Type);

   --  Deallocates each node in hash table HT. (Note that it only deallocates

   --  the nodes, not the buckets array.)  Program_Error is raised if the hash

   --  table is busy.

   procedure Move (Target, Source : in out Hash_Table_Type);

   --  Moves (not copies) the buckets array and nodes from Source to

   --  Target. Program_Error is raised if Source is busy. The Target is first

   --  cleared to deallocate its nodes (implying that Program_Error is also

   --  raised if Target is busy). Source is empty following the move.

   function Capacity (HT : Hash_Table_Type) return Count_Type;

   --  Returns the length of the buckets array

   procedure Reserve_Capacity

     (HT : in out Hash_Table_Type;

      N  : Count_Type);

   --  If N is greater than the current capacity, then it expands the buckets

   --  array to at least the value N. If N is less than the current capacity,

   --  then it contracts the buckets array. In either case existing nodes are

   --  rehashed onto the new buckets array, and the old buckets array is

   --  deallocated. Program_Error is raised if the hash table is busy.

   procedure Delete_Node_Sans_Free

     (HT : in out Hash_Table_Type;

      X  : Node_Access);

   --  Removes node X from the hash table without deallocating the node

   function First (HT : Hash_Table_Type) return Node_Access;

   --  Returns the head of the list in the first (lowest-index) non-empty

   --  bucket.

   function Next

     (HT   : Hash_Table_Type;

      Node : Node_Access) return Node_Access;

   --  Returns the node that immediately follows Node. This corresponds to

   --  either the next node in the same bucket, or (if Node is the last node in

   --  its bucket) the head of the list in the first non-empty bucket that

   --  follows.

   generic

      with procedure Process (Node : Node_Access);

   procedure Generic_Iteration (HT : Hash_Table_Type);

   --  Calls Process for each node in hash table HT

   generic

      use Ada.Streams;

      with procedure Write

        (Stream : not null access Root_Stream_Type'Class;

         Node   : Node_Access);

   procedure Generic_Write

     (Stream : not null access Root_Stream_Type'Class;

      HT     : Hash_Table_Type);

   --  Used to implement the streaming attribute for hashed containers. It

   --  calls Write for each node to write its value into Stream.

   generic

      use Ada.Streams;

      with function New_Node (Stream : not null access Root_Stream_Type'Class)

         return Node_Access;

   procedure Generic_Read

     (Stream : not null access Root_Stream_Type'Class;

      HT     : out Hash_Table_Type);

   --  Used to implement the streaming attribute for hashed containers. It

   --  first clears hash table HT, then populates the hash table by calling

   --  New_Node for each item in Stream.

   function New_Buckets (Length : Hash_Type) return Buckets_Access;

   pragma Inline (New_Buckets);

   --  Allocate a new Buckets_Type array with bounds 0..Length-1

   procedure Free_Buckets (Buckets : in out Buckets_Access);

   pragma Inline (Free_Buckets);

   --  Unchecked_Deallocate Buckets

   --  Note: New_Buckets and Free_Buckets are needed because Buckets_Access has

   --  an empty pool.

end Ada.Containers.Hash_Tables.Generic_Operations;