111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
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// -*- C++ -*-
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// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 2, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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// MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free
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// software library without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to
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// produce an executable, this file does not by itself cause the
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// resulting executable to be covered by the GNU General Public
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// License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General
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// Public License.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file twister_rand_gen.hpp
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* Contains a random number generator invented and implemented by
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* Makoto Matsumoto
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* (http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html)
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*/
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#ifndef PB_DS_TWISTER_RAND_GEN_HPP
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#define PB_DS_TWISTER_RAND_GEN_HPP
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#include <ctime>
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#include <limits.h>
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namespace pb_ds
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{
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namespace test
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{
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class twister_rand_gen
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{
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private:
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enum
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{
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mers_n = 624,
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mers_m = 397,
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mers_r = 31,
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mers_u = 11,
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mers_s = 7,
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mers_t = 15,
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mers_l = 18,
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mers_a = 0x9908B0DF,
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mers_b = 0x9D2C5680,
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mers_c = 0xEFC60000
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};
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unsigned long m_a_mt[mers_n];
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unsigned long m_mti;
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enum endianess_type
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{
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little,
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big,
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none
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};
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endianess_type m_endianess;
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unsigned long
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get_unsigned_long_imp();
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public:
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twister_rand_gen(unsigned long seed = static_cast<unsigned long>(std::time(0)));
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void
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init(unsigned long seed);
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static unsigned long
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get_time_determined_seed()
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{ return (static_cast<unsigned long>(std::time(0))); }
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unsigned long
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get_unsigned_long(unsigned long min = 0, unsigned long max = UINT_MAX - 1);
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double
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get_prob();
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};
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} // namespace test
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} // namespace pb_ds
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#endif // #ifndef PB_DS_TWISTER_RAND_GEN_HPP
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