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variate_generator 追加

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bolero-MURAKAMI 2011-09-30 00:06:24 +09:00
parent 4a345e8259
commit 8b357a75da
3 changed files with 158 additions and 0 deletions
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1
sprout/random.hpp
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@ -6,6 +6,7 @@
#include <sprout/random/linear_congruential.hpp>
#include <sprout/random/uniform_smallint.hpp>
#include <sprout/random/uniform_01.hpp>
#include <sprout/random/variate_generator.hpp>
#endif // #ifndef SPROUT_RANDOM_HPP

73
sprout/random/detail/ptr_helper.hpp Normal file
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#ifndef SPROUT_RANDOM_DETAIL_PTR_HELPER_HPP
#define SPROUT_RANDOM_DETAIL_PTR_HELPER_HPP
#include <sprout/config.hpp>
namespace sprout {
namespace random {
namespace detail {
template<typename T>
struct ptr_helper {
typedef T value_type;
typedef T& reference_type;
typedef T const& const_reference_type;
typedef T const& rvalue_type;
static reference_type ref(T& r) {
return r;
}
static SPROUT_CONSTEXPR const_reference_type ref(T const& r) {
return r;
}
};
template<typename T>
struct ptr_helper<T&> {
typedef T value_type;
typedef T& reference_type;
typedef T const& const_reference_type;
typedef T& rvalue_type;
static reference_type ref(T& r) {
return r;
}
static SPROUT_CONSTEXPR const_reference_type ref(T const& r) {
return r;
}
};
template<typename T>
struct ptr_helper<T const&> {
typedef T value_type;
typedef T const& reference_type;
typedef T const& const_reference_type;
typedef T const& rvalue_type;
static SPROUT_CONSTEXPR const_reference_type ref(T const& r) {
return r;
}
};
template<typename T>
struct ptr_helper<T*> {
typedef T value_type;
typedef T& reference_type;
typedef T const& const_reference_type;
typedef T* rvalue_type;
static reference_type ref(T* p) {
return *p;
}
static SPROUT_CONSTEXPR const_reference_type ref(T const* p) {
return *p;
}
};
template<typename T>
struct ptr_helper<T const*> {
typedef T value_type;
typedef T const& reference_type;
typedef T const& const_reference_type;
typedef T const* rvalue_type;
static SPROUT_CONSTEXPR const_reference_type ref(T const* p) {
return *p;
}
};
} // namespace detail
} // namespace random
} // namespace sprout
#endif // #ifndef SPROUT_RANDOM_DETAIL_PTR_HELPER_HPP

84
sprout/random/variate_generator.hpp Normal file
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#ifndef SPROUT_RANDOM_VARIATE_GENERATOR_HPP
#define SPROUT_RANDOM_VARIATE_GENERATOR_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/detail/if.hpp>
#include <sprout/random/detail/ptr_helper.hpp>
#include <sprout/random/random_result.hpp>
namespace sprout {
namespace random {
//
// variate_generator
//
template<typename Engine, typename Distribution>
class variate_generator {
private:
typedef sprout::random::detail::ptr_helper<Engine> engine_helper_type;
typedef sprout::random::detail::ptr_helper<Distribution> distribution_helper_type;
public:
typedef typename engine_helper_type::value_type engine_value_type;
typedef typename distribution_helper_type::value_type distribution_value_type;
typedef typename engine_helper_type::reference_type engine_reference_type;
typedef typename distribution_helper_type::reference_type distribution_reference_type;
typedef typename engine_helper_type::const_reference_type engine_const_reference_type;
typedef typename distribution_helper_type::const_reference_type distribution_const_reference_type;
typedef typename engine_helper_type::rvalue_type engine_param_type;
typedef typename distribution_helper_type::rvalue_type distribution_param_type;
public:
typedef Engine engine_type;
typedef Distribution distribution_type;
typedef typename distribution_value_type::result_type result_type;
private:
engine_type engine_;
distribution_type distribution_;
public:
SPROUT_CONSTEXPR variate_generator(
engine_param_type engine,
distribution_param_type distribution
)
: engine_(engine)
, distribution_(distribution)
{}
SPROUT_CONSTEXPR sprout::random::random_result<engine_value_type, distribution_value_type> operator()() const {
return distribution_(engine_);
}
engine_reference_type engine() {
return engine_helper_type::ref(engine_);
}
SPROUT_CONSTEXPR engine_const_reference_type engine() const {
return engine_helper_type::ref(engine_);
}
distribution_reference_type distribution() {
return distribution_helper_type::ref(distribution_);
}
SPROUT_CONSTEXPR distribution_const_reference_type distribution() const {
return distribution_helper_type::ref(distribution_);
}
SPROUT_CONSTEXPR result_type min() const {
return distribution_.min();
}
SPROUT_CONSTEXPR result_type max() const {
return distribution_.max();
}
};
//
// combine
//
template<typename Engine, typename Distribution>
SPROUT_CONSTEXPR sprout::random::variate_generator<Engine const&, Distribution const&> combine(
Engine const& engine,
Distribution const& distribution
)
{
return sprout::random::variate_generator<Engine const&, Distribution const&>(engine, distribution);
}
} // namespace random
using sprout::random::variate_generator;
} // namespace sprout
#endif // #ifndef SPROUT_RANDOM_VARIATE_GENERATOR_HPP