mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
218 lines
7.1 KiB
C++
218 lines
7.1 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_STATEFUL_RAND_HPP
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#define SPROUT_STATEFUL_RAND_HPP
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#include <cstdlib>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/utility/as_const.hpp>
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#include <sprout/random/default_random_engine.hpp>
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#include <sprout/random/random_result.hpp>
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#include <sprout/random/unique_seed.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/workaround/detail/uniform_int_distribution.hpp>
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namespace sprout {
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#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
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namespace detail {
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typedef sprout::random::default_random_engine rand_generator_type;
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typedef SPROUT_WORKAROUND_DETAIL_UNIFORM_INT_DISTRIBUTION<int> rand_distribution_type;
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typedef sprout::random::random_result<
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sprout::detail::rand_generator_type,
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sprout::detail::rand_distribution_type
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> rand_result_type;
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SPROUT_STATIC_CONSTEXPR std::size_t rand_default_seed = SPROUT_UNIQUE_SEED;
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} // namespace detail
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namespace rand_detail {
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#if defined(__GNUC__) && !defined(__clang__)
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wnon-template-friend"
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#endif
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#if defined(__clang__)
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wundefined-inline"
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#endif
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template<int N>
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struct tag {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::rand_detail::tag<N>);
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friend SPROUT_CONSTEXPR bool adl_is_srand(sprout::rand_detail::tag<N>);
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friend SPROUT_CONSTEXPR unsigned adl_seed(sprout::rand_detail::tag<N>);
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};
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#if defined(__clang__)
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# pragma clang diagnostic pop
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#endif
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#if defined(__GNUC__) && !defined(__clang__)
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# pragma GCC diagnostic pop
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#endif
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template<int N, bool IsSrand = false, unsigned Seed = 0>
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struct state {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::rand_detail::tag<N>) {
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return N;
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}
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friend SPROUT_CONSTEXPR bool adl_is_srand(sprout::rand_detail::tag<N>) {
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return IsSrand;
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}
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friend SPROUT_CONSTEXPR unsigned adl_seed(sprout::rand_detail::tag<N>) {
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return Seed;
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}
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// generate a next random number
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SPROUT_STATIC_CONSTEXPR sprout::detail::rand_result_type result
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_INNER((
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!IsSrand
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? sprout::rand_detail::state<
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N - 1,
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adl_is_srand(sprout::rand_detail::tag<N - 1>()),
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adl_seed(sprout::rand_detail::tag<N - 1>())
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>::result()
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: sprout::detail::rand_result_type(
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Seed,
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sprout::detail::rand_generator_type(Seed),
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sprout::detail::rand_distribution_type(0, RAND_MAX)
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)
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))
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;
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SPROUT_STATIC_CONSTEXPR int value = result;
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};
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template<int N, bool IsSrand, unsigned Seed>
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SPROUT_CONSTEXPR_OR_CONST sprout::detail::rand_result_type sprout::rand_detail::state<N, IsSrand, Seed>::result
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_OUTER((
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!IsSrand
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? sprout::rand_detail::state<
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N - 1,
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adl_is_srand(sprout::rand_detail::tag<N - 1>()),
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adl_seed(sprout::rand_detail::tag<N - 1>())
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>::result()
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: sprout::detail::rand_result_type(
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0,
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sprout::detail::rand_generator_type(Seed),
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sprout::detail::rand_distribution_type(0, RAND_MAX)
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)
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))
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;
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template<int N, bool IsSrand, unsigned Seed>
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SPROUT_CONSTEXPR_OR_CONST int sprout::rand_detail::state<N, IsSrand, Seed>::value;
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template<bool IsSrand, unsigned Seed>
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struct state<0, IsSrand, Seed> {
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friend SPROUT_CONSTEXPR int adl_counter(sprout::rand_detail::tag<0>) {
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return 0;
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}
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friend SPROUT_CONSTEXPR bool adl_is_srand(sprout::rand_detail::tag<0>) {
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return IsSrand;
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}
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friend SPROUT_CONSTEXPR unsigned adl_seed(sprout::rand_detail::tag<0>) {
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return Seed;
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}
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// generate a first random number between [0, RAND_MAX]
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SPROUT_STATIC_CONSTEXPR sprout::detail::rand_result_type result
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_INNER((
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!IsSrand
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? sprout::detail::rand_distribution_type(0, RAND_MAX)
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(sprout::as_const(sprout::detail::rand_generator_type(!IsSrand ? sprout::detail::rand_default_seed : Seed)))
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: sprout::detail::rand_result_type(
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Seed,
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sprout::detail::rand_generator_type(Seed),
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sprout::detail::rand_distribution_type(0, RAND_MAX)
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)
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))
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;
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static SPROUT_CONSTEXPR int value = result;
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};
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template<bool IsSrand, unsigned Seed>
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SPROUT_CONSTEXPR_OR_CONST sprout::detail::rand_result_type sprout::rand_detail::state<0, IsSrand, Seed>::result
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SPROUT_STATIC_CONSTEXPR_DATA_MEMBER_OUTER(
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!IsSrand
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? sprout::detail::rand_distribution_type(0, RAND_MAX)
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(sprout::as_const(sprout::detail::rand_generator_type(!IsSrand ? sprout::detail::rand_default_seed : Seed)))
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: sprout::detail::rand_result_type(
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Seed,
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sprout::detail::rand_generator_type(Seed),
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sprout::detail::rand_distribution_type(0, RAND_MAX)
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)
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)
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;
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template<bool IsSrand, unsigned Seed>
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SPROUT_CONSTEXPR_OR_CONST int sprout::rand_detail::state<0, IsSrand, Seed>::value;
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template<int N, int = adl_counter(sprout::rand_detail::tag<N>())>
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inline SPROUT_CONSTEXPR bool check(int, sprout::rand_detail::tag<N>) {
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return true;
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}
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template<int N>
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inline SPROUT_CONSTEXPR bool check(long, sprout::rand_detail::tag<N>) {
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return false;
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}
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template<int N>
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inline SPROUT_CONSTEXPR bool check(bool R = sprout::rand_detail::check(0, sprout::rand_detail::tag<N>())) {
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return R;
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}
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template<int N>
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inline SPROUT_CONSTEXPR int counter(sprout::false_type, sprout::rand_detail::tag<N>) {
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return 0;
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}
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template<int N>
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inline SPROUT_CONSTEXPR int counter(
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sprout::true_type, sprout::rand_detail::tag<N>,
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int R = !sprout::rand_detail::check<N>() ? N
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: counter(sprout::bool_constant<sprout::rand_detail::check<N>()>(), sprout::rand_detail::tag<N + 1>())
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)
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{
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return R;
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}
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template<int N = 0>
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inline SPROUT_CONSTEXPR int counter(int R = sprout::rand_detail::counter(sprout::true_type(), sprout::rand_detail::tag<N>())) {
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return R;
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}
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} // namespace rand_detail
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//
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// rand
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//
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template<
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int N = 1,
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int R = sprout::rand_detail::state<
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sprout::rand_detail::counter() + N - 1
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>::value
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>
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inline SPROUT_CONSTEXPR int rand() {
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return R;
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}
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//
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// srand
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// srand_return
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//
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template<
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unsigned Seed,
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int N = 1,
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int = sprout::rand_detail::state<
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sprout::rand_detail::counter() + N - 1,
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true, Seed
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>::value
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>
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SPROUT_CXX14_CONSTEXPR void srand() {}
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template<
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unsigned Seed,
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int N = 1,
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int R = sprout::rand_detail::state<
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sprout::rand_detail::counter() + N - 1,
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true, Seed
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>::value
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>
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inline SPROUT_CONSTEXPR unsigned srand_return() {
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return R;
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}
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#endif
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} // namespace sprout
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#endif // #ifndef SPROUT_STATEFUL_RAND_HPP
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