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140 lines
4.0 KiB
140 lines
4.0 KiB
/***************************************************************************
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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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* This is an internal header file used to implement the C++ Standard
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* Library. It should never be #included directly by a program.
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*
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* $Id: _random.h 172106 2011-11-02 17:04:12Z statham $
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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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* Copyright (c) 1994-2001 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--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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#ifndef _RWSTD_RANDOM_H_INCLUDED
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#define _RWSTD_RANDOM_H_INCLUDED
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#include <rw/_defs.h>
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#include _RWSTD_CSTDDEF
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#ifdef _RWSTD_MULTI_THREAD
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# include <rw/_mutex.h>
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#endif // _RWSTD_MULTI_THREAD
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// prevent complaints by compilers such as g++ 2.95.2 that
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// cannot inline functions containing static local) variables
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#ifdef _INLINE_WITH_STATICS
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# define _INLINE _INLINE_WITH_STATICS
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#else
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# define _INLINE
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#endif
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_RWSTD_NAMESPACE_BEGIN (__rw)
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template <unsigned _SIZE>
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class _RWSTD_EXPORT __rw_random_generator
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{
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enum { _C_SIZE = _SIZE };
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unsigned long _C_table [_C_SIZE];
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_RWSTD_C::size_t _C_index1;
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_RWSTD_C::size_t _C_index2;
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public:
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__rw_random_generator (unsigned long __seed = 161803398) {
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seed (__seed);
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}
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void seed (unsigned long __seed);
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unsigned long operator() (unsigned long __limit);
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static unsigned long generate (unsigned long __limit);
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};
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template <unsigned _SIZE>
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inline unsigned long
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__rw_random_generator<_SIZE>::operator() (unsigned long __limit)
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{
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_RWSTD_ASSERT (0 != __limit);
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_C_table [++_C_index1 %= _C_SIZE] -= _C_table [++_C_index2 %= _C_SIZE];
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return _C_table [_C_index1] % __limit;
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}
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template <unsigned _SIZE>
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_INLINE unsigned long
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__rw_random_generator<_SIZE>::generate (unsigned long __limit)
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{
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_RWSTD_MT_STATIC_GUARD (__guard);
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static __rw_random_generator __gen;
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return __gen (__limit);
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}
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template <class _Distance>
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inline _Distance __rw_random (_Distance __limit)
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{
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return __rw_random_generator<55>::generate (__limit);
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}
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_RWSTD_INSTANTIATE_1 (class _RWSTD_EXPORT __rw_random_generator<55>);
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_RWSTD_NAMESPACE_END // __rw
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#undef _INLINE
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#ifdef _RWSTD_COMPILE_INSTANTIATE
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# include <rw/_random.cc>
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#endif
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#endif // _RWSTD_RANDOM_H_INCLUDED
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