/usr/include/linbox/randiter/gf2.h is in liblinbox-dev 1.4.2-3.
This file is owned by root:root, with mode 0o644.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | /* linbox/randiter/gf2.h
* Copyright (C) 2003 Bradford Hovinen
*
* Written by Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* ------------------------------------
*
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*.
*/
#ifndef __LINBOX_randiter_gf2_H
#define __LINBOX_randiter_gf2_H
#include <iostream>
#include <vector>
#include <time.h>
#include "linbox/linbox-config.h"
#include "linbox/integer.h"
// #include "linbox/field/modular.h"
#include "linbox/element/abstract.h"
#include "linbox/element/envelope.h"
#include "linbox/util/commentator.h"
#include "linbox/randiter/mersenne-twister.h"
#include "linbox/vector/bit-vector.h"
namespace LinBox
{
class GF2RandIter {
public:
typedef bool Element;
/** Constructor from field, sampling size, and seed.
* The random field element iterator works in the field F, is seeded
* by seed, and it returns any one element with probability no more
* than 1/min (size, F.cardinality (c)).
* A sampling size of zero means to sample from the entire field.
* A seed of zero means to use some arbitrary seed for the generator.
* Purely virtual.
* @param F LinBox field archetype object in which to do arithmetic
* @param size constant integer reference of sample size from which to
* sample (default = modulus of field)
* @param seed constant integer reference from which to seed random number
* generator (default = 0)
*/
GF2RandIter (const GF2 & F,
const integer &size = 0 ,
const integer &seed = 0)
{
int32_t _seed = seed;
if (_seed == 0) _seed = (int32_t)time (NULL);
MT.setSeed ((uint32_t)_seed);
}
/// constructor
GF2RandIter (const GF2RandIter &) {}
/** Destructor.
* This destructs the random field element generator object.
*/
~GF2RandIter () {}
/** Assignment operator.
* Assigns ModularRandIter object R to generator.
* @param R ModularRandIter object.
*/
GF2RandIter &operator = (const GF2RandIter & R)
{ return *this; }
/** Random field element creator.
* This returns a random field element from the information supplied
* at the creation of the generator.
* Required by abstract base class.
* @return reference to random field element
*/
bool &random (bool &a) const
{
return a = MT.randomIntRange (0, 2);
}
/** Random field element creator.
* This returns a random field element from the information supplied
* at the creation of the generator.
* Required by abstract base class.
* @return reference to random field element
*/
BitVector::reference random (BitVector::reference a) const
{ return a = MT.randomIntRange (0, 2); }
/** Random field element creator.
* This returns a random field element from the information supplied
* at the creation of the generator.
* Required by abstract base class.
* @return reference to random field element
*/
stdBitReference random (stdBitReference a) const
{ return a = MT.randomIntRange (0, 2); }
/** Random field element creator.
* This returns a random field element from the information supplied
* at the creation of the generator.
* Required by abstract base class.
* @return reference to random field element
*/
ElementAbstract &random (ElementAbstract &a) const
{
bool tmp;
random (tmp);
return (a = ElementEnvelope <GF2> (tmp));
}
uint32_t& random (uint32_t& a) const
{ return a = MT.randomInt(); }
MersenneTwister& getMT() { return MT; }
const MersenneTwister& getMT() const { return MT; }
private:
MersenneTwister MT;
}; // class GF2RandIter
} // namespace LinBox
namespace LinBox
{
template<size_t bitsize>
struct MTrandomInt {
template<typename M32Twister>
uint32_t operator() (M32Twister& MT) const
{
return MT.randomInt();
}
};
template<>
struct MTrandomInt<64> {
template<typename M32Twister>
uint64_t operator() (M32Twister& MT) const
{
uint64_t tmp = MT.randomInt();
tmp <<=32;
return tmp += MT.randomInt();
}
};
} // namespace LinBox
#endif // __LINBOX_randiter_gf2_H
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