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/* haertel.hpp file
*
* Copyright Jens Maurer 2000, 2002
* Distributed under the Boost Software License, Version 1.0. (See
* accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* $Id$
*
* Revision history
*/
/*
* NOTE: This is not part of the official boost submission. It exists
* only as a collection of ideas.
*/
#ifndef BOOST_RANDOM_HAERTEL_HPP
#define BOOST_RANDOM_HAERTEL_HPP
#include <boost/cstdint.hpp>
#include <boost/random/linear_congruential.hpp>
#include <boost/random/inversive_congruential.hpp>
namespace boost {
namespace random {
// Wikramaratna 1989 ACORN
template<class IntType, int k, IntType m, IntType val>
class additive_congruential
{
public:
typedef IntType result_type;
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
static const bool has_fixed_range = true;
static const result_type min_value = 0;
static const result_type max_value = m-1;
#else
enum {
has_fixed_range = true,
min_value = 0,
max_value = m-1
};
#endif
template<class InputIterator>
explicit additive_congruential(InputIterator start) { seed(start); }
template<class InputIterator>
void seed(InputIterator start)
{
for(int i = 0; i <= k; ++i, ++start)
values[i] = *start;
}
result_type operator()()
{
for(int i = 1; i <= k; ++i) {
IntType tmp = values[i-1] + values[i];
if(tmp >= m)
tmp -= m;
values[i] = tmp;
}
return values[k];
}
result_type validation() const { return val; }
private:
IntType values[k+1];
};
template<class IntType, int r, int s, IntType m, IntType val>
class lagged_fibonacci_int
{
public:
typedef IntType result_type;
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
static const bool has_fixed_range = true;
static const result_type min_value = 0;
static const result_type max_value = m-1;
#else
enum {
has_fixed_range = true,
min_value = 0,
max_value = m-1
};
#endif
explicit lagged_fibonacci_int(IntType start) { seed(start); }
template<class Generator>
explicit lagged_fibonacci_int(Generator & gen) { seed(gen); }
void seed(IntType start)
{
linear_congruential<uint32_t, 299375077, 0, 0, 0> init;
seed(init);
}
template<class Generator>
void seed(Generator & gen)
{
assert(r > s);
for(int i = 0; i < 607; ++i)
values[i] = gen();
current = 0;
lag = r-s;
}
result_type operator()()
{
result_type tmp = values[current] + values[lag];
if(tmp >= m)
tmp -= m;
values[current] = tmp;
++current;
if(current >= r)
current = 0;
++lag;
if(lag >= r)
lag = 0;
return tmp;
}
result_type validation() const { return val; }
private:
result_type values[r];
int current, lag;
};
} // namespace random
} // namespace boost
// distributions from Haertel's dissertation
// (additional parameterizations of the basic templates)
namespace Haertel {
typedef boost::random::linear_congruential<boost::uint64_t, 45965, 453816691,
(boost::uint64_t(1)<<31), 0> LCG_Af2;
typedef boost::random::linear_congruential<boost::uint64_t, 211936855, 0,
(boost::uint64_t(1)<<29)-3, 0> LCG_Die1;
typedef boost::random::linear_congruential<boost::uint32_t, 2824527309u, 0,
0, 0> LCG_Fis;
typedef boost::random::linear_congruential<boost::uint64_t, 950706376u, 0,
(boost::uint64_t(1)<<31)-1, 0> LCG_FM;
typedef boost::random::linear_congruential<boost::int32_t, 51081, 0,
2147483647, 0> LCG_Hae;
typedef boost::random::linear_congruential<boost::uint32_t, 69069, 1,
0, 0> LCG_VAX;
typedef boost::random::inversive_congruential<boost::int64_t, 240318, 197,
1000081, 0> NLG_Inv1;
typedef boost::random::inversive_congruential<boost::int64_t, 15707262,
13262967, (1<<24)-17, 0> NLG_Inv2;
typedef boost::random::inversive_congruential<boost::int32_t, 1, 1,
2147483647, 0> NLG_Inv4;
typedef boost::random::inversive_congruential<boost::int32_t, 1, 2,
1<<30, 0> NLG_Inv5;
typedef boost::random::additive_congruential<boost::int32_t, 6,
(1<<30)-35, 0> MRG_Acorn7;
typedef boost::random::lagged_fibonacci_int<boost::uint32_t, 607, 273,
0, 0> MRG_Fib2;
} // namespace Haertel
#endif
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