random.h

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00001 /*
00002  * random.h
00003  *
00004  * ISAAC random number generator by Bob Jenkins.
00005  *
00006  * Portable Windows Library
00007  *
00008  * Copyright (c) 1993-2000 Equivalence Pty. Ltd.
00009  *
00010  * The contents of this file are subject to the Mozilla Public License
00011  * Version 1.0 (the "License"); you may not use this file except in
00012  * compliance with the License. You may obtain a copy of the License at
00013  * http://www.mozilla.org/MPL/
00014  *
00015  * Software distributed under the License is distributed on an "AS IS"
00016  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
00017  * the License for the specific language governing rights and limitations
00018  * under the License.
00019  *
00020  * The Original Code is Portable Windows Library.
00021  *
00022  * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
00023  *
00024  * Contributor(s): ______________________________________.
00025  *
00026  * $Log: random.h,v $
00027  * Revision 1.6  2005/11/30 12:47:37  csoutheren
00028  * Removed tabs, reformatted some code, and changed tags for Doxygen
00029  *
00030  * Revision 1.5  2004/11/11 07:34:50  csoutheren
00031  * Added #include <ptlib.h>
00032  *
00033  * Revision 1.4  2002/09/16 01:08:59  robertj
00034  * Added #define so can select if #pragma interface/implementation is used on
00035  *   platform basis (eg MacOS) rather than compiler, thanks Robert Monaghan.
00036  *
00037  * Revision 1.3  2001/03/03 05:12:47  robertj
00038  * Fixed yet another transcription error of random number generator code.
00039  *
00040  * Revision 1.2  2001/02/27 03:33:44  robertj
00041  * Changed random number generator due to licensing issues.
00042  *
00043  * Revision 1.1  2000/02/17 12:05:02  robertj
00044  * Added better random number generator after finding major flaws in MSVCRT version.
00045  *
00046  */
00047 
00048 #ifndef _PRANDOM
00049 #define _PRANDOM
00050 
00051 
00052 #ifdef P_USE_PRAGMA
00053 #pragma interface
00054 #endif
00055 
00056 #include <ptlib.h>
00057 
00074 class PRandom
00075 {
00076   public:
00081     PRandom();
00082 
00087     PRandom(
00088       DWORD seed    
00089     );
00090 
00093     void SetSeed(
00094       DWORD seed    
00095     );
00096 
00101     unsigned Generate();
00102 
00105     inline operator unsigned() { return Generate(); }
00106 
00107 
00112     static unsigned Number();
00113 
00114 
00115   protected:
00116     enum {
00117       RandBits = 8, 
00118       RandSize = 1<<RandBits
00119     };
00120 
00121     DWORD randcnt;
00122     DWORD randrsl[RandSize];
00123     DWORD randmem[RandSize];
00124     DWORD randa;
00125     DWORD randb;
00126     DWORD randc;
00127 };
00128 
00129 
00130 #endif  // _PRANDOM
00131 
00132 
00133 // End Of File ///////////////////////////////////////////////////////////////

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