mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
255 lines
7.6 KiB
C++
255 lines
7.6 KiB
C++
#ifndef SPROUT_RANDOM_UNIFORM_SMALLINT_HPP
|
|
#define SPROUT_RANDOM_UNIFORM_SMALLINT_HPP
|
|
|
|
#include <iosfwd>
|
|
#include <istream>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/random/detail/signed_unsigned_tools.hpp>
|
|
#include <sprout/random/random_result.hpp>
|
|
#include <sprout/random/uniform_01.hpp>
|
|
|
|
namespace sprout {
|
|
namespace random {
|
|
//
|
|
// uniform_smallint
|
|
//
|
|
template<typename IntType = int>
|
|
class uniform_smallint {
|
|
public:
|
|
typedef IntType input_type;
|
|
typedef IntType result_type;
|
|
public:
|
|
//
|
|
// param_type
|
|
//
|
|
class param_type {
|
|
public:
|
|
typedef uniform_smallint distribution_type;
|
|
private:
|
|
static SPROUT_CONSTEXPR IntType arg_check(IntType min_arg, IntType max_arg) {
|
|
return min_arg <= max_arg
|
|
? min_arg
|
|
: throw "assert(min_arg <= max_arg)"
|
|
;
|
|
}
|
|
private:
|
|
IntType min_;
|
|
IntType max_;
|
|
public:
|
|
SPROUT_CONSTEXPR param_type()
|
|
: min_(0)
|
|
, max_(9)
|
|
{}
|
|
SPROUT_CONSTEXPR explicit param_type(IntType min_arg, IntType max_arg = 9)
|
|
: min_(arg_check(min_arg, max_arg))
|
|
, max_(max_arg)
|
|
{}
|
|
SPROUT_CONSTEXPR IntType a() const {
|
|
return min_;
|
|
}
|
|
SPROUT_CONSTEXPR IntType b() const {
|
|
return max_;
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend std::basic_ostream<Elem, Traits>& operator>>(
|
|
std::basic_istream<Elem, Traits>& lhs,
|
|
param_type const& rhs
|
|
)
|
|
{
|
|
return lhs >> rhs.min_ >> std::ws >> rhs.max_;
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend std::basic_ostream<Elem, Traits>& operator<<(
|
|
std::basic_ostream<Elem, Traits>& lhs,
|
|
param_type const& rhs
|
|
)
|
|
{
|
|
return lhs << rhs.min_ << " " << rhs.max_;
|
|
}
|
|
SPROUT_CONSTEXPR friend bool operator==(param_type const& lhs, param_type const& rhs) {
|
|
return lhs.min_ == rhs.min_ && lhs.max_ == rhs.max_;
|
|
}
|
|
SPROUT_CONSTEXPR friend bool operator!=(param_type const& lhs, param_type const& rhs) {
|
|
return !(lhs == rhs);
|
|
}
|
|
};
|
|
private:
|
|
result_type min_;
|
|
result_type max_;
|
|
private:
|
|
template<typename Engine, typename RangeType, typename BaseUnsigned>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate_true_2(
|
|
Engine const& eng,
|
|
sprout::random::random_result<Engine> const& rnd,
|
|
RangeType range,
|
|
BaseUnsigned base_range,
|
|
BaseUnsigned val
|
|
) const
|
|
{
|
|
return range >= base_range
|
|
? sprout::random::random_result<Engine, uniform_smallint>(
|
|
sprout::random::detail::add<RangeType, result_type>()(static_cast<RangeType>(val), min_),
|
|
rnd.engine(),
|
|
*this
|
|
)
|
|
: sprout::random::random_result<Engine, uniform_smallint>(
|
|
sprout::random::detail::add<RangeType, result_type>()(static_cast<RangeType>(val % (static_cast<BaseUnsigned>(range) + 1)), min_),
|
|
rnd.engine(),
|
|
*this
|
|
)
|
|
;
|
|
}
|
|
template<typename Engine, typename RangeType, typename BaseUnsigned>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate_true_1(
|
|
Engine const& eng,
|
|
sprout::random::random_result<Engine> const& rnd,
|
|
RangeType range,
|
|
BaseUnsigned base_range
|
|
) const
|
|
{
|
|
typedef typename Engine::result_type base_result;
|
|
return generate_true_2(
|
|
eng,
|
|
rnd,
|
|
range,
|
|
base_range,
|
|
BaseUnsigned(sprout::random::detail::subtract<base_result>()(rnd.result(), eng.min()))
|
|
);
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate(
|
|
Engine const& eng,
|
|
std::true_type
|
|
) const
|
|
{
|
|
typedef typename Engine::result_type base_result;
|
|
typedef typename std::make_unsigned<base_result>::type base_unsigned;
|
|
typedef typename std::make_unsigned<result_type>::type range_type;
|
|
return generate_true_1(
|
|
eng,
|
|
eng(),
|
|
range_type(sprout::random::detail::subtract<result_type>()(max_, min_)),
|
|
base_unsigned(sprout::random::detail::subtract<result_type>()(eng.max(), eng.min()))
|
|
);
|
|
}
|
|
template<typename Engine, typename RangeType>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate_false_2(
|
|
Engine const& eng,
|
|
sprout::random::random_result<Engine, sprout::random::uniform_01<typename Engine::result_type> > const& rnd,
|
|
RangeType range,
|
|
RangeType offset
|
|
) const
|
|
{
|
|
return offset > range
|
|
? sprout::random::random_result<Engine, uniform_smallint>(
|
|
max_,
|
|
rnd.engine(),
|
|
*this
|
|
)
|
|
: sprout::random::random_result<Engine, uniform_smallint>(
|
|
sprout::random::detail::add<RangeType, result_type>()(offset , min_),
|
|
rnd.engine(),
|
|
*this
|
|
)
|
|
;
|
|
}
|
|
template<typename Engine, typename RangeType>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate_false_1(
|
|
Engine const& eng,
|
|
sprout::random::random_result<Engine, sprout::random::uniform_01<typename Engine::result_type> > const& rnd,
|
|
RangeType range
|
|
) const
|
|
{
|
|
typedef typename Engine::result_type base_result;
|
|
return generate_false_2(
|
|
eng,
|
|
rnd,
|
|
RangeType(sprout::random::detail::subtract<result_type>()(max_, min_)),
|
|
RangeType(static_cast<RangeType>(rnd.result() * (static_cast<base_result>(range) + 1)))
|
|
);
|
|
}
|
|
template<class Engine>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> generate(
|
|
Engine const& eng,
|
|
std::false_type
|
|
) const
|
|
{
|
|
typedef typename Engine::result_type base_result;
|
|
typedef typename std::make_unsigned<result_type>::type range_type;
|
|
return generate_false_1(
|
|
eng,
|
|
sprout::random::uniform_01<base_result>()(eng),
|
|
range_type(sprout::random::detail::subtract<result_type>()(max_, min_))
|
|
);
|
|
}
|
|
public:
|
|
SPROUT_CONSTEXPR uniform_smallint()
|
|
: min_(0)
|
|
, max_(9)
|
|
{}
|
|
SPROUT_CONSTEXPR explicit uniform_smallint(IntType min_arg, IntType max_arg = 9)
|
|
: min_(min_arg)
|
|
, max_(max_arg)
|
|
{}
|
|
explicit uniform_smallint(param_type const& parm)
|
|
: min_(parm.a())
|
|
, max_(parm.b())
|
|
{}
|
|
SPROUT_CONSTEXPR result_type a() const {
|
|
return min_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type b() const {
|
|
return max_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type min() const {
|
|
return min_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type max() const {
|
|
return max_;
|
|
}
|
|
SPROUT_CONSTEXPR param_type param() const {
|
|
return param_type(min_, max_);
|
|
}
|
|
void param(param_type const& parm) {
|
|
min_ = parm.a();
|
|
max_ = parm.b();
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_smallint> operator()(Engine const& eng) const {
|
|
typedef typename Engine::result_type base_result;
|
|
return generate(eng, typename std::is_integral<base_result>::type());
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend std::basic_ostream<Elem, Traits>& operator>>(
|
|
std::basic_istream<Elem, Traits>& lhs,
|
|
uniform_smallint const& rhs
|
|
)
|
|
{
|
|
param_type parm;
|
|
return lhs >> parm;
|
|
param(parm);
|
|
return lhs;
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend std::basic_ostream<Elem, Traits>& operator<<(
|
|
std::basic_ostream<Elem, Traits>& lhs,
|
|
uniform_smallint const& rhs
|
|
)
|
|
{
|
|
return lhs << param();
|
|
}
|
|
SPROUT_CONSTEXPR friend bool operator==(uniform_smallint const& lhs, uniform_smallint const& rhs) {
|
|
return lhs.param() == rhs.param();
|
|
}
|
|
SPROUT_CONSTEXPR friend bool operator!=(uniform_smallint const& lhs, uniform_smallint const& rhs) {
|
|
return !(lhs == rhs);
|
|
}
|
|
};
|
|
} // namespace random
|
|
|
|
using sprout::random::uniform_smallint;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_RANDOM_UNIFORM_SMALLINT_HPP
|
|
|