/usr/include/wfmath-1.0/wfmath/MersenneTwister.h is in libwfmath-1.0-dev 1.0.2+dfsg1-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | // MersenneTwister.h
//
// The WorldForge Project
// Copyright (C) 2013 The WorldForge Project
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// For information about WorldForge and its authors, please contact
// the Worldforge Web Site at http://www.worldforge.org.
//
#ifndef WFMATH_MERSENNE_TWISTER_H_
#define WFMATH_MERSENNE_TWISTER_H_
#include <iosfwd>
#include <climits>
#include <cmath>
#include <stdint.h>
namespace WFMath {
class MTRand {
public:
typedef uint32_t uint32;
static const uint32 state_size = 624;
public:
MTRand();
MTRand(uint32 oneSeed);
MTRand(uint32* const bigSeed, uint32 const seedLength = state_size);
// real-valued random numbers on [0, 1] or [0, n]
template<typename FloatT>
FloatT rand();
double rand();
double rand(const double& n);
// integer-valued random numbers on [0, 2^32-1] or [0, n]
uint32 randInt();
uint32 randInt(uint32 n);
void seed();
void seed(uint32 oneSeed);
void seed(uint32* const init_vector, uint32 init_vector_length = state_size);
std::ostream& save(std::ostream&) const;
std::istream& load(std::istream&);
static MTRand instance;
private:
uint32 state[state_size];
uint32 index;
};
inline MTRand::MTRand(uint32 s)
: index(0)
{ seed(s); }
inline MTRand::MTRand(uint32* const bigSeed, const uint32 seedLength)
: index(0)
{ seed(bigSeed, seedLength); }
inline MTRand::MTRand()
: index(0)
{ seed(); }
template<>
inline float MTRand::rand<float>()
{ return float(randInt()) * (1.0f/4294967295.0f); }
template<>
inline double MTRand::rand<double>()
{ return double(randInt()) * (1.0/4294967295.0); }
inline double MTRand::rand()
{ return double(randInt()) * (1.0/4294967295.0); }
inline double MTRand::rand( const double& n )
{ return rand() * n; }
inline MTRand::uint32 MTRand::randInt(uint32 n)
{
uint32 used = n;
used |= used >> 1;
used |= used >> 2;
used |= used >> 4;
used |= used >> 8;
used |= used >> 16;
uint32 i;
do
i = randInt() & used;
while( i > n );
return i;
}
#if 0
inline void MTRand::save(uint32* saveArray) const
{
register uint32 *sa = saveArray;
register const uint32 *s = state;
register int i = state_size;
for( ; i--; *sa++ = *s++ ) {}
*sa = left;
}
inline void MTRand::load(uint32 *const loadArray)
{
register uint32 *s = state;
register uint32 *la = loadArray;
register int i = state_size;
for( ; i--; *s++ = *la++ ) {}
left = *la;
pNext = &state[state_size-left];
}
#endif
std::ostream& operator<<(std::ostream& os, MTRand const& mtrand);
std::istream& operator>>(std::istream& is, MTRand& mtrand);
} // namespace
#endif // WFMATH_MERSENNE_TWISTER_H_
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