96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
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#ifndef __RANDOM_H
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#define __RANDOM_H
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#pragma option push -b -a8 -pc -Vx- -Ve- -w-inl -w-aus -w-sig
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/***************************************************************************
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*
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* random.h - Header for the Standard Library random generator
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*
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* $Id: random.h,v 1.6 1996/08/28 01:30:28 smithey Exp $
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*
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***************************************************************************
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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***************************************************************************
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*
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* Copyright (c) 1994-1999 Rogue Wave Software, Inc. All Rights Reserved.
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*
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* This computer software is owned by Rogue Wave Software, Inc. and is
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* protected by U.S. copyright laws and other laws and by international
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* treaties. This computer software is furnished by Rogue Wave Software,
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* Inc. pursuant to a written license agreement and may be used, copied,
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* transmitted, and stored only in accordance with the terms of such
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* license and with the inclusion of the above copyright notice. This
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* computer software or any other copies thereof may not be provided or
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* otherwise made available to any other person.
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*
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* U.S. Government Restricted Rights. This computer software is provided
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* with Restricted Rights. Use, duplication, or disclosure by the
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* Government is subject to restrictions as set forth in subparagraph (c)
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* (1) (ii) of The Rights in Technical Data and Computer Software clause
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* at DFARS 252.227-7013 or subparagraphs (c) (1) and (2) of the
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* Commercial Computer Software <EFBFBD> Restricted Rights at 48 CFR 52.227-19,
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* as applicable. Manufacturer is Rogue Wave Software, Inc., 5500
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* Flatiron Parkway, Boulder, Colorado 80301 USA.
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*
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**************************************************************************/
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#include <stdcomp.h>
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#include <rw/stddefs.h>
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#ifdef _RWSTD_MULTI_THREAD
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#include <rw/stdmutex.h>
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#endif
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#ifndef _RWSTD_NO_NAMESPACE
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namespace __rwstd {
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#endif
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class _RWSTDExport __random_generator
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{
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protected:
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enum { LENGTH = 55 };
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unsigned long table[LENGTH];
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size_t index1;
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size_t index2;
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#ifdef _RWSTD_MULTI_THREAD
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_RWSTDMutex mutex;
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#endif
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void seed (unsigned long j);
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public:
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unsigned long operator() (unsigned long limit)
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{
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#ifdef _RWSTD_MULTI_THREAD
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_RWSTDGuard guard(mutex);
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#endif
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index1 = (index1 + 1) % LENGTH;
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index2 = (index2 + 1) % LENGTH;
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table[index1] = table[index1] - table[index2];
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return table[index1] % limit;
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}
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__random_generator (unsigned long j) { this->seed(j); }
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};
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#ifndef _RWSTD_NO_NAMESPACE
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}
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#endif
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#pragma option pop
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#endif /* __RANDOM_H */
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