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bolero-MURAKAMI 2011-09-29 22:46:32 +09:00
parent 305ae86d92
commit 4a345e8259
6 changed files with 544 additions and 8 deletions
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sprout/random/random_result.hpp Normal file
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#ifndef SPROUT_RANDOM_RANDOM_RESULT_HPP
#define SPROUT_RANDOM_RANDOM_RESULT_HPP
#include <type_traits>
#include <sprout/config.hpp>
namespace sprout {
namespace random {
//
// random_result
//
template<typename Engine, typename Distribution = void, typename Enable = void>
class random_result;
template<typename Engine, typename Distribution>
class random_result<
Engine,
Distribution,
typename std::enable_if<!std::is_same<Distribution, void>::value>::type
> {
public:
typedef Engine engine_type;
typedef Distribution distribution_type;
typedef typename distribution_type::result_type result_type;
private:
result_type result_;
engine_type engine_;
distribution_type distribution_;
public:
SPROUT_CONSTEXPR random_result(
result_type result,
engine_type const& engine,
distribution_type const& distribution
)
: result_(result)
, engine_(engine)
, distribution_(distribution)
{}
SPROUT_CONSTEXPR operator result_type() const {
return result_;
}
SPROUT_CONSTEXPR result_type operator*() const {
return result_;
}
SPROUT_CONSTEXPR random_result operator()() const {
return distribution_(engine_);
}
result_type& result() {
return result_;
}
SPROUT_CONSTEXPR result_type const& result() const {
return result_;
}
engine_type& engine() {
return engine_;
}
SPROUT_CONSTEXPR engine_type const& engine() const {
return engine_;
}
distribution_type& distribution() {
return distribution_;
}
SPROUT_CONSTEXPR distribution_type const& distribution() const {
return distribution_;
}
SPROUT_CONSTEXPR result_type min() const {
return distribution_.min();
}
SPROUT_CONSTEXPR result_type max() const {
return distribution_.max();
}
};
template<typename Engine, typename Distribution>
class random_result<
Engine,
Distribution,
typename std::enable_if<std::is_same<Distribution, void>::value>::type
> {
public:
typedef Engine engine_type;
typedef typename engine_type::result_type result_type;
private:
result_type result_;
engine_type engine_;
public:
SPROUT_CONSTEXPR random_result(
result_type result,
engine_type const& engine
)
: result_(result)
, engine_(engine)
{}
SPROUT_CONSTEXPR operator result_type() const {
return result_;
}
SPROUT_CONSTEXPR result_type operator*() const {
return result_;
}
SPROUT_CONSTEXPR random_result operator()() const {
return engine_();
}
result_type& result() {
return result_;
}
SPROUT_CONSTEXPR result_type const& result() const {
return result_;
}
engine_type& engine() {
return engine_;
}
SPROUT_CONSTEXPR engine_type const& engine() const {
return engine_;
}
SPROUT_CONSTEXPR result_type min() const {
return engine_.min();
}
SPROUT_CONSTEXPR result_type max() const {
return engine_.max();
}
};
} // namespace random
using sprout::random::random_result;
} // namespace sprout
#endif // #ifndef SPROUT_RANDOM_RANDOM_RESULT_HPP