mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
104 lines
4.6 KiB
C++
104 lines
4.6 KiB
C++
#ifndef SPROUT_ALGORITHM_FIXED_RANDOM_SWAP_RESULT_HPP
|
|
#define SPROUT_ALGORITHM_FIXED_RANDOM_SWAP_RESULT_HPP
|
|
|
|
#include <cstddef>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/array/array.hpp>
|
|
#include <sprout/tuple/tuple/tuple.hpp>
|
|
#include <sprout/tuple/tuple/get.hpp>
|
|
#include <sprout/container/traits.hpp>
|
|
#include <sprout/container/functions.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/utility/forward.hpp>
|
|
#include <sprout/utility/pair/pair.hpp>
|
|
#include <sprout/utility/pair/access.hpp>
|
|
#include <sprout/algorithm/fixed/result_of.hpp>
|
|
#include <sprout/algorithm/fixed/swap_element.hpp>
|
|
#include <sprout/workaround/detail/uniform_int_distribution.hpp>
|
|
|
|
namespace sprout {
|
|
namespace fixed {
|
|
namespace detail {
|
|
template<typename UniformRandomNumberGenerator, typename Random>
|
|
inline SPROUT_CONSTEXPR sprout::pair<sprout::array<std::ptrdiff_t, 2>, typename std::decay<UniformRandomNumberGenerator>::type>
|
|
make_random_swap_result_indexes_2(Random const& rnd, std::ptrdiff_t i0) {
|
|
typedef sprout::pair<sprout::array<std::ptrdiff_t, 2>, typename std::decay<UniformRandomNumberGenerator>::type> result_type;
|
|
return result_type(
|
|
sprout::array<std::ptrdiff_t, 2>{{i0, rnd.result()}},
|
|
rnd.engine()
|
|
);
|
|
}
|
|
template<typename UniformRandomNumberGenerator, typename Random>
|
|
inline SPROUT_CONSTEXPR sprout::pair<sprout::array<std::ptrdiff_t, 2>, typename std::decay<UniformRandomNumberGenerator>::type>
|
|
make_random_swap_result_indexes_1(Random const& rnd) {
|
|
return sprout::fixed::detail::make_random_swap_result_indexes_2<UniformRandomNumberGenerator>(
|
|
rnd(),
|
|
rnd.result()
|
|
);
|
|
}
|
|
template<typename UniformRandomNumberGenerator>
|
|
inline SPROUT_CONSTEXPR sprout::pair<sprout::array<std::ptrdiff_t, 2>, typename std::decay<UniformRandomNumberGenerator>::type>
|
|
make_random_swap_result_indexes(std::ptrdiff_t n, UniformRandomNumberGenerator&& g) {
|
|
typedef sprout::pair<sprout::array<std::ptrdiff_t, 2>, typename std::decay<UniformRandomNumberGenerator>::type> result_type;
|
|
return n > 1
|
|
? sprout::fixed::detail::make_random_swap_result_indexes_1<UniformRandomNumberGenerator>(
|
|
SPROUT_WORKAROUND_DETAIL_UNIFORM_INT_DISTRIBUTION<std::ptrdiff_t>(0, n - 1)(
|
|
sprout::forward<UniformRandomNumberGenerator>(g)
|
|
)
|
|
)
|
|
: result_type(
|
|
sprout::array<std::ptrdiff_t, 2>{{}},
|
|
sprout::forward<UniformRandomNumberGenerator>(g)
|
|
)
|
|
;
|
|
}
|
|
template<typename UniformRandomNumberGenerator, typename Container, typename RandomSwapped>
|
|
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::shuffle<Container, UniformRandomNumberGenerator>::type
|
|
random_swap_result_impl_1(Container const& cont, RandomSwapped const& random_swapped) {
|
|
typedef typename sprout::fixed::result_of::shuffle<Container, UniformRandomNumberGenerator>::type result_type;
|
|
return sprout::first(random_swapped)[0] == sprout::first(random_swapped)[1]
|
|
? result_type(sprout::deep_copy(cont), sprout::second(random_swapped))
|
|
: result_type(
|
|
sprout::fixed::swap_element(
|
|
cont,
|
|
sprout::next(sprout::begin(cont), sprout::first(random_swapped)[0]),
|
|
sprout::next(sprout::begin(cont), sprout::first(random_swapped)[1])
|
|
),
|
|
sprout::second(random_swapped)
|
|
)
|
|
;
|
|
}
|
|
template<typename Container, typename UniformRandomNumberGenerator>
|
|
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::shuffle<Container, UniformRandomNumberGenerator>::type
|
|
random_swap_result_impl(
|
|
Container const& cont, UniformRandomNumberGenerator&& g,
|
|
typename sprout::container_traits<Container>::size_type size
|
|
)
|
|
{
|
|
return sprout::fixed::detail::random_swap_result_impl_1<UniformRandomNumberGenerator>(
|
|
cont,
|
|
sprout::fixed::detail::make_random_swap_result_indexes(
|
|
size,
|
|
sprout::forward<UniformRandomNumberGenerator>(g)
|
|
)
|
|
);
|
|
}
|
|
} // namespace detail
|
|
//
|
|
// random_swap_result
|
|
//
|
|
template<typename Container, typename UniformRandomNumberGenerator>
|
|
inline SPROUT_CONSTEXPR typename sprout::fixed::result_of::shuffle<Container, UniformRandomNumberGenerator>::type
|
|
random_swap_result(Container const& cont, UniformRandomNumberGenerator&& g) {
|
|
return sprout::fixed::detail::random_swap_result_impl(
|
|
cont, sprout::forward<UniformRandomNumberGenerator>(g),
|
|
sprout::size(cont)
|
|
);
|
|
}
|
|
} // namespace fixed
|
|
|
|
using sprout::fixed::random_swap_result;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_ALGORITHM_FIXED_RANDOM_SWAP_RESULT_HPP
|