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https://github.com/bolero-MURAKAMI/Sprout.git
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90 lines
3.9 KiB
C++
90 lines
3.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 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_RANDOM_GENERATE_ARRAY_HPP
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#define SPROUT_RANDOM_GENERATE_ARRAY_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/array/array.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/pair/pair.hpp>
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#include <sprout/random/results.hpp>
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#include <sprout/generator/results.hpp>
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namespace sprout {
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namespace random {
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//
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// generate_array
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//
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template<std::size_t N, typename RandomNumberGenerator>
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inline SPROUT_CXX14_CONSTEXPR sprout::array<typename RandomNumberGenerator::result_type, N>
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generate_array(RandomNumberGenerator& rng) {
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sprout::array<typename RandomNumberGenerator::result_type, N> result{{}};
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for (std::size_t i = 0; i != N; ++i) {
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result[i] = rng();
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}
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return result;
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}
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template<std::size_t N, typename RandomNumberGenerator, typename Distribution>
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inline SPROUT_CXX14_CONSTEXPR sprout::array<typename std::remove_reference<Distribution>::type::result_type, N>
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generate_array(RandomNumberGenerator& rng, Distribution&& dist) {
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sprout::array<typename std::remove_reference<Distribution>::type::result_type, N> result{{}};
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for (std::size_t i = 0; i != N; ++i) {
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result[i] = SPROUT_FORWARD(Distribution, dist)(rng);
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}
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return result;
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}
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namespace detail {
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template<std::size_t N, typename RandomNumberGenerator, typename Random, typename... Args>
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static SPROUT_CONSTEXPR typename std::enable_if<
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(sizeof...(Args) + 1 == N),
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sprout::pair<
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sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
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typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
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> const
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>::type generate_array_impl(Random const& rnd, Args const&... args) {
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typedef sprout::pair<
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sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
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typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
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> const pair_type;
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return pair_type{
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sprout::array<typename RandomNumberGenerator::result_type, N>{{args..., sprout::random::result(rnd)}},
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sprout::random::next(rnd)
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};
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}
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template<std::size_t N, typename RandomNumberGenerator, typename Random, typename... Args>
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static SPROUT_CONSTEXPR typename std::enable_if<
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(sizeof...(Args) + 1 < N),
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sprout::pair<
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sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
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typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
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> const
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>::type generate_array_impl(Random const& rnd, Args const&... args) {
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return sprout::random::detail::generate_array_impl<N, RandomNumberGenerator>(
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sprout::random::next(rnd)(),
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args..., sprout::random::result(rnd)
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);
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}
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} // namespace detail
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//
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// generate_array
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//
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template<std::size_t N, typename RandomNumberGenerator>
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inline SPROUT_CONSTEXPR sprout::pair<
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sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
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typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
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> const
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generate_array(RandomNumberGenerator const& rng) {
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return sprout::random::detail::generate_array_impl<N, RandomNumberGenerator>(rng());
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}
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} // namespace random
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_GENERATE_ARRAY_HPP
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