random.h

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/*
 * random.h
 *
 * ISAAC random number generator by Bob Jenkins.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-2000 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): ______________________________________.
 *
 * $Revision: 21788 $
 * $Author: rjongbloed $
 * $Date: 2008-12-12 16:42:13 +1100 (Fri, 12 Dec 2008) $
 */

#ifndef PTLIB_RANDOM_H
#define PTLIB_RANDOM_H


#ifdef P_USE_PRAGMA
#pragma interface
#endif


class PRandom
{
  public:
    PRandom();

    PRandom(
      DWORD seed    
    );

    void SetSeed(
      DWORD seed    
    );

    unsigned Generate();

    unsigned Generate(unsigned maximum);

    unsigned Generate(unsigned minimum, unsigned maximum);

    inline operator unsigned() { return Generate(); }


    static unsigned Number();

    static unsigned Number(unsigned maximum);

    static unsigned Number(unsigned minimum, unsigned maximum);

  protected:
    enum {
      RandBits = 8, 
      RandSize = 1<<RandBits
    };

    DWORD randcnt;
    DWORD randrsl[RandSize];
    DWORD randmem[RandSize];
    DWORD randa;
    DWORD randb;
    DWORD randc;
};


#endif  // PTLIB_RANDOM_H


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