126 lines
3.7 KiB
C++
Executable File
126 lines
3.7 KiB
C++
Executable File
/* boost random/additive_combine.hpp header file
|
|
*
|
|
* Copyright Jens Maurer 2000-2001
|
|
* 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)
|
|
*
|
|
* See http://www.boost.org for most recent version including documentation.
|
|
*
|
|
* $Id: additive_combine.hpp 41369 2007-11-25 18:07:19Z bemandawes $
|
|
*
|
|
* Revision history
|
|
* 2001-02-18 moved to individual header files
|
|
*/
|
|
|
|
#ifndef BOOST_RANDOM_ADDITIVE_COMBINE_HPP
|
|
#define BOOST_RANDOM_ADDITIVE_COMBINE_HPP
|
|
|
|
#include <iostream>
|
|
#include <algorithm> // for std::min and std::max
|
|
#include <boost/config.hpp>
|
|
#include <boost/cstdint.hpp>
|
|
#include <boost/random/linear_congruential.hpp>
|
|
|
|
namespace boost {
|
|
namespace random {
|
|
|
|
// L'Ecuyer 1988
|
|
template<class MLCG1, class MLCG2,
|
|
#ifndef BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS
|
|
typename MLCG1::result_type
|
|
#else
|
|
int32_t
|
|
#endif
|
|
val>
|
|
class additive_combine
|
|
{
|
|
public:
|
|
typedef MLCG1 first_base;
|
|
typedef MLCG2 second_base;
|
|
typedef typename MLCG1::result_type result_type;
|
|
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
|
|
static const bool has_fixed_range = true;
|
|
static const result_type min_value = 1;
|
|
static const result_type max_value = MLCG1::max_value-1;
|
|
#else
|
|
enum { has_fixed_range = false };
|
|
#endif
|
|
result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return 1; }
|
|
result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return (_mlcg1.max)()-1; }
|
|
|
|
additive_combine() : _mlcg1(), _mlcg2() { }
|
|
additive_combine(typename MLCG1::result_type seed1,
|
|
typename MLCG2::result_type seed2)
|
|
: _mlcg1(seed1), _mlcg2(seed2) { }
|
|
template<class It> additive_combine(It& first, It last)
|
|
: _mlcg1(first, last), _mlcg2(first, last) { }
|
|
|
|
void seed()
|
|
{
|
|
_mlcg1.seed();
|
|
_mlcg2.seed();
|
|
}
|
|
|
|
void seed(typename MLCG1::result_type seed1,
|
|
typename MLCG2::result_type seed2)
|
|
{
|
|
_mlcg1.seed(seed1);
|
|
_mlcg2.seed(seed2);
|
|
}
|
|
|
|
template<class It> void seed(It& first, It last)
|
|
{
|
|
_mlcg1.seed(first, last);
|
|
_mlcg2.seed(first, last);
|
|
}
|
|
|
|
result_type operator()() {
|
|
result_type z = _mlcg1() - _mlcg2();
|
|
if(z < 1)
|
|
z += MLCG1::modulus-1;
|
|
return z;
|
|
}
|
|
static bool validation(result_type x) { return val == x; }
|
|
|
|
#ifndef BOOST_NO_OPERATORS_IN_NAMESPACE
|
|
|
|
#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
|
|
template<class CharT, class Traits>
|
|
friend std::basic_ostream<CharT,Traits>&
|
|
operator<<(std::basic_ostream<CharT,Traits>& os, const additive_combine& r)
|
|
{ os << r._mlcg1 << " " << r._mlcg2; return os; }
|
|
|
|
template<class CharT, class Traits>
|
|
friend std::basic_istream<CharT,Traits>&
|
|
operator>>(std::basic_istream<CharT,Traits>& is, additive_combine& r)
|
|
{ is >> r._mlcg1 >> std::ws >> r._mlcg2; return is; }
|
|
#endif
|
|
|
|
friend bool operator==(const additive_combine& x, const additive_combine& y)
|
|
{ return x._mlcg1 == y._mlcg1 && x._mlcg2 == y._mlcg2; }
|
|
friend bool operator!=(const additive_combine& x, const additive_combine& y)
|
|
{ return !(x == y); }
|
|
#else
|
|
// Use a member function; Streamable concept not supported.
|
|
bool operator==(const additive_combine& rhs) const
|
|
{ return _mlcg1 == rhs._mlcg1 && _mlcg2 == rhs._mlcg2; }
|
|
bool operator!=(const additive_combine& rhs) const
|
|
{ return !(*this == rhs); }
|
|
#endif
|
|
private:
|
|
MLCG1 _mlcg1;
|
|
MLCG2 _mlcg2;
|
|
};
|
|
|
|
} // namespace random
|
|
|
|
typedef random::additive_combine<
|
|
random::linear_congruential<int32_t, 40014, 0, 2147483563, 0>,
|
|
random::linear_congruential<int32_t, 40692, 0, 2147483399, 0>,
|
|
2060321752> ecuyer1988;
|
|
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_RANDOM_ADDITIVE_COMBINE_HPP
|