hash_table.h

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// -*- C++ -*-

// $Id: Hash_Table.h 80826 2008-03-04 14:51:23Z wotte $

// Copyright (C) 1989 Free Software Foundation, Inc.
// written by Douglas C. Schmidt ([e-mail])

// This file is part of GNU GPERF.

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#ifndef HASH_TABLE_H
#define HASH_TABLE_H

#include "ace/config-all.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "Options.h"
#include "List_Node.h"

#if defined (ACE_HAS_GPERF)
// @@ This class should be replaced by something in ACE, e.g.,
// ACE_Hash_Map_Manager.  Perhaps we should implement a new
// ACE_Hash_Map that uses double hashing, however!
class Hash_Table
{
  // = TITLE
  //   Hash table used to check for duplicate keyword entries.
  //
  // = DESCRIPTION
  //   This implementation uses "double hashing."
public:
  Hash_Table (size_t s);

  ~Hash_Table (void);

  List_Node *find (List_Node *item, int ignore_length);

private:
  List_Node **table_;
  // Vector of pointers to linked lists of List_Node's.

  size_t size_;
  // Size of the vector.

  int collisions_;
  // Find out how well our double hashing is working!
};

#endif /* ACE_HAS_GPERF */
#endif /* HASH_TABLE_H */