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