mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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549 lines
20 KiB
C++
549 lines
20 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2013 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_UNIFORM_REAL_DISTRIBUTION_HPP
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#define SPROUT_RANDOM_UNIFORM_REAL_DISTRIBUTION_HPP
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#include <ios>
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#include <istream>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/random/detail/signed_unsigned_tools.hpp>
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#include <sprout/random/random_result.hpp>
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#include <sprout/assert.hpp>
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namespace sprout {
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namespace random {
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namespace detail {
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template<typename T, typename Engine>
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struct generate_uniform_real_result {
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public:
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T result;
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Engine engine;
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};
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template<typename Engine, typename T>
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inline SPROUT_CXX14_CONSTEXPR T
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generate_uniform_real(
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Engine& eng, T min_value, T max_value,
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std::false_type
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)
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{
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for(;;) {
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typedef T result_type;
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typedef typename Engine::result_type base_result;
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result_type numerator = static_cast<T>(static_cast<base_result>(eng()) - eng.min());
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result_type divisor = static_cast<T>(eng.max() - eng.min());
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SPROUT_ASSERT(divisor > 0);
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SPROUT_ASSERT(numerator >= 0 && numerator <= divisor);
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result_type result = numerator / divisor * (max_value - min_value) + min_value;
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if (result < max_value) {
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return result;
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}
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}
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}
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template<typename Engine, typename T>
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inline SPROUT_CXX14_CONSTEXPR T
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generate_uniform_real(
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Engine& eng, T min_value, T max_value,
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std::true_type
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)
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{
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for(;;) {
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typedef T result_type;
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typedef typename Engine::result_type base_result;
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result_type numerator = static_cast<T>(sprout::random::detail::subtract<base_result>()(static_cast<base_result>(eng()), eng.min()));
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result_type divisor = static_cast<T>(sprout::random::detail::subtract<base_result>()(eng.max(), eng.min())) + 1;
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SPROUT_ASSERT(divisor > 0);
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SPROUT_ASSERT(numerator >= 0 && numerator <= divisor);
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result_type result = numerator / divisor * (max_value - min_value) + min_value;
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if (result < max_value) {
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return result;
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}
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}
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}
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template<typename Engine, typename T>
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inline SPROUT_CXX14_CONSTEXPR T
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generate_uniform_real(
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Engine& eng, T min_value, T max_value
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)
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{
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return sprout::random::detail::generate_uniform_real(
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eng, min_value, max_value,
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typename std::is_integral<typename Engine::result_type>::type()
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);
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}
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#ifdef SPROUT_WORKAROUND_NOT_TERMINATE_RECURSIVE_CONSTEXPR_FUNCTION_TEMPLATE
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template<int D = 16, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<int D = 16, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_3(
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Engine const& eng,
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T min_value, T max_value,
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T result
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)
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{
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return result < max_value
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? sprout::random::detail::generate_uniform_real_result<T, Engine>{result, eng}
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: sprout::random::detail::generate_uniform_real_false_1<D + 1>(eng(), min_value, max_value)
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;
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_3(
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Engine const&,
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T, T,
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T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_2(
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Engine const& eng,
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T min_value, T max_value,
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T numerator, T divisor
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)
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{
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return SPROUT_ASSERT(divisor > 0), SPROUT_ASSERT(numerator >= 0 && numerator <= divisor),
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sprout::random::detail::generate_uniform_real_false_3<D + 1>(
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eng,
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min_value, max_value,
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numerator / divisor * (max_value - min_value) + min_value
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)
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;
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_2(
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Engine const&,
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T, T,
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T, T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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template<int D, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE_DECL(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const& rnd,
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T min_value, T max_value
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)
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{
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return sprout::random::detail::generate_uniform_real_false_2<D + 1>(
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rnd.engine(),
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min_value, max_value,
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static_cast<T>(rnd.result() - rnd.engine().min()), static_cast<T>(rnd.engine().max() - rnd.engine().min())
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);
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}
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template<int D, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK_DECL(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const&,
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T, T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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template<int D = 16, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<int D = 16, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_3(
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Engine const& eng,
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T min_value, T max_value,
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T result
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)
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{
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return result < max_value
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? sprout::random::detail::generate_uniform_real_result<T, Engine>{result, eng}
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: sprout::random::detail::generate_uniform_real_true_1<D + 1>(eng(), min_value, max_value)
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;
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_3(
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Engine const&,
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T, T,
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T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_2(
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Engine const& eng,
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T min_value, T max_value,
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T numerator, T divisor
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)
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{
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return SPROUT_ASSERT(divisor > 0), SPROUT_ASSERT(numerator >= 0 && numerator <= divisor),
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sprout::random::detail::generate_uniform_real_true_3<D + 1>(
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eng,
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min_value, max_value,
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numerator / divisor * (max_value - min_value) + min_value
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)
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;
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}
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template<int D, typename Engine, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_2(
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Engine const&,
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T, T,
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T, T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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template<int D, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_CONTINUE_DECL(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const& rnd,
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T min_value, T max_value
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)
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{
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typedef typename EngineResult::result_type base_result;
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return sprout::random::detail::generate_uniform_real_true_2<D + 1>(
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rnd.engine(),
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min_value, max_value,
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static_cast<T>(sprout::random::detail::subtract<base_result>()(rnd.result(), rnd.engine().min())),
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static_cast<T>(sprout::random::detail::subtract<base_result>()(rnd.engine().max(), rnd.engine().min())) + 1
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);
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}
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template<int D, typename EngineResult, typename T, SPROUT_RECURSIVE_FUNCTION_TEMPLATE_BREAK_DECL(D)>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const&,
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T, T
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)
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{
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return sprout::throw_recursive_function_template_instantiation_exeeded();
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}
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#else
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template<typename EngineResult, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_3(
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Engine const& eng,
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T min_value, T max_value,
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T result
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)
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{
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return result < max_value
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? sprout::random::detail::generate_uniform_real_result<T, Engine>{result, eng}
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: sprout::random::detail::generate_uniform_real_false_1(eng(), min_value, max_value)
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;
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}
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_false_2(
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Engine const& eng,
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T min_value, T max_value,
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T numerator, T divisor
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)
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{
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return SPROUT_ASSERT(divisor > 0), SPROUT_ASSERT(numerator >= 0 && numerator <= divisor),
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sprout::random::detail::generate_uniform_real_false_3(
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eng,
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min_value, max_value,
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numerator / divisor * (max_value - min_value) + min_value
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)
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;
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}
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template<typename EngineResult, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_false_1(
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EngineResult const& rnd,
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T min_value, T max_value
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)
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{
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return sprout::random::detail::generate_uniform_real_false_2(
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rnd.engine(),
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min_value, max_value,
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static_cast<T>(rnd.result() - rnd.engine().min()), static_cast<T>(rnd.engine().max() - rnd.engine().min())
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);
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}
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template<typename EngineResult, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const& rnd,
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T min_value, T max_value
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);
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_3(
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Engine const& eng,
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T min_value, T max_value,
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T result
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)
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{
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return result < max_value
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? sprout::random::detail::generate_uniform_real_result<T, Engine>{result, eng}
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: sprout::random::detail::generate_uniform_real_true_1(eng(), min_value, max_value)
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;
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}
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real_true_2(
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Engine const& eng,
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T min_value, T max_value,
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T numerator, T divisor
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)
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{
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return SPROUT_ASSERT(divisor > 0), SPROUT_ASSERT(numerator >= 0 && numerator <= divisor),
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sprout::random::detail::generate_uniform_real_true_3(
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eng,
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min_value, max_value,
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numerator / divisor * (max_value - min_value) + min_value
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)
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;
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}
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template<typename EngineResult, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, typename EngineResult::engine_type>
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generate_uniform_real_true_1(
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EngineResult const& rnd,
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T min_value, T max_value
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)
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{
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typedef typename EngineResult::result_type base_result;
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return sprout::random::detail::generate_uniform_real_true_2(
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rnd.engine(),
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min_value, max_value,
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static_cast<T>(sprout::random::detail::subtract<base_result>()(rnd.result(), rnd.engine().min())),
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static_cast<T>(sprout::random::detail::subtract<base_result>()(rnd.engine().max(), rnd.engine().min())) + 1
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);
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}
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#endif
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real(
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Engine const& eng,
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T min_value, T max_value,
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std::false_type
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)
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{
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return sprout::random::detail::generate_uniform_real_false_1(
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eng(),
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min_value, max_value
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);
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}
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real(
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Engine const& eng,
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T min_value, T max_value,
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std::true_type
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)
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{
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return sprout::random::detail::generate_uniform_real_true_1(
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eng(),
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min_value, max_value
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);
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}
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template<typename Engine, typename T>
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inline SPROUT_CONSTEXPR sprout::random::detail::generate_uniform_real_result<T, Engine>
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generate_uniform_real(
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Engine const& eng,
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T min_value, T max_value
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)
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{
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return sprout::random::detail::generate_uniform_real(
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eng,
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min_value, max_value,
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typename std::is_integral<typename Engine::result_type>::type()
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);
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}
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} // namespace detail
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//
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// uniform_real_distribution
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//
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template<typename RealType = double>
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class uniform_real_distribution {
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public:
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typedef RealType input_type;
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typedef RealType result_type;
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public:
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//
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// param_type
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//
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class param_type {
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public:
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typedef uniform_real_distribution distribution_type;
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private:
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RealType min_;
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RealType max_;
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public:
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SPROUT_CONSTEXPR param_type()
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: min_(RealType(0.0))
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, max_(RealType(1.0))
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{}
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explicit SPROUT_CONSTEXPR param_type(RealType min_arg, RealType max_arg = RealType(1.0))
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: min_((SPROUT_ASSERT(min_arg <= max_arg), min_arg))
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, max_(max_arg)
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{}
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SPROUT_CONSTEXPR RealType a() const SPROUT_NOEXCEPT {
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return min_;
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}
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SPROUT_CONSTEXPR RealType b() const SPROUT_NOEXCEPT {
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return max_;
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}
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template<typename Elem, typename Traits>
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friend SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>& operator>>(
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std::basic_istream<Elem, Traits>& lhs,
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param_type& rhs
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)
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{
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RealType min;
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RealType max;
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if (lhs >> min >> std::ws >> max) {
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if (min <= max) {
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rhs.min_ = min;
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rhs.max_ = max;
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} else {
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lhs.setstate(std::ios_base::failbit);
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}
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}
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return lhs;
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}
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template<typename Elem, typename Traits>
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friend SPROUT_NON_CONSTEXPR std::basic_ostream<Elem, Traits>& operator<<(
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std::basic_ostream<Elem, Traits>& lhs,
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param_type const& rhs
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)
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{
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return lhs << rhs.min_ << " " << rhs.max_;
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}
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friend SPROUT_CONSTEXPR bool operator==(param_type const& lhs, param_type const& rhs) SPROUT_NOEXCEPT {
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return lhs.min_ == rhs.min_ && lhs.max_ == rhs.max_;
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}
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friend SPROUT_CONSTEXPR bool operator!=(param_type const& lhs, param_type const& rhs) SPROUT_NOEXCEPT {
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return !(lhs == rhs);
|
|
}
|
|
};
|
|
private:
|
|
RealType min_;
|
|
RealType max_;
|
|
private:
|
|
template<typename Engine, typename Result>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_real_distribution> generate(Result const& rnd) const {
|
|
return sprout::random::random_result<Engine, uniform_real_distribution>(
|
|
rnd.result,
|
|
rnd.engine,
|
|
*this
|
|
);
|
|
}
|
|
public:
|
|
SPROUT_CONSTEXPR uniform_real_distribution() SPROUT_NOEXCEPT
|
|
: min_(RealType(0.0))
|
|
, max_(RealType(1.0))
|
|
{}
|
|
explicit SPROUT_CONSTEXPR uniform_real_distribution(RealType min_arg, RealType max_arg = RealType(1.0))
|
|
: min_((SPROUT_ASSERT(min_arg <= max_arg), min_arg))
|
|
, max_(max_arg)
|
|
{}
|
|
explicit SPROUT_CONSTEXPR uniform_real_distribution(param_type const& parm) SPROUT_NOEXCEPT
|
|
: min_(parm.a())
|
|
, max_(parm.b())
|
|
{}
|
|
SPROUT_CONSTEXPR result_type a() const SPROUT_NOEXCEPT {
|
|
return min_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type b() const SPROUT_NOEXCEPT {
|
|
return max_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
|
|
return min_;
|
|
}
|
|
SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
|
|
return max_;
|
|
}
|
|
SPROUT_CXX14_CONSTEXPR void reset() SPROUT_NOEXCEPT {}
|
|
SPROUT_CONSTEXPR param_type param() const SPROUT_NOEXCEPT {
|
|
return param_type(min_, max_);
|
|
}
|
|
SPROUT_CXX14_CONSTEXPR void param(param_type const& parm) {
|
|
min_ = parm.a();
|
|
max_ = parm.b();
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CXX14_CONSTEXPR result_type operator()(Engine& eng) const {
|
|
return sprout::random::detail::generate_uniform_real(eng, min_, max_);
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_real_distribution> const operator()(Engine const& eng) const {
|
|
return generate<Engine>(sprout::random::detail::generate_uniform_real(eng, min_, max_));
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CXX14_CONSTEXPR result_type operator()(Engine& eng, param_type const& parm) const {
|
|
return sprout::random::detail::generate_uniform_real(eng, parm.a(), parm.b());
|
|
}
|
|
template<typename Engine>
|
|
SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_real_distribution> const operator()(Engine const& eng, param_type const& parm) const {
|
|
return generate<Engine>(sprout::random::detail::generate_uniform_real(eng, parm.a(), parm.b()));
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>& operator>>(
|
|
std::basic_istream<Elem, Traits>& lhs,
|
|
uniform_real_distribution& rhs
|
|
)
|
|
{
|
|
param_type parm;
|
|
if (lhs >> parm) {
|
|
rhs.param(parm);
|
|
}
|
|
return lhs;
|
|
}
|
|
template<typename Elem, typename Traits>
|
|
friend SPROUT_NON_CONSTEXPR std::basic_ostream<Elem, Traits>& operator<<(
|
|
std::basic_ostream<Elem, Traits>& lhs,
|
|
uniform_real_distribution const& rhs
|
|
)
|
|
{
|
|
return lhs << rhs.param();
|
|
}
|
|
friend SPROUT_CONSTEXPR bool operator==(uniform_real_distribution const& lhs, uniform_real_distribution const& rhs) SPROUT_NOEXCEPT {
|
|
return lhs.param() == rhs.param();
|
|
}
|
|
friend SPROUT_CONSTEXPR bool operator!=(uniform_real_distribution const& lhs, uniform_real_distribution const& rhs) SPROUT_NOEXCEPT {
|
|
return !(lhs == rhs);
|
|
}
|
|
};
|
|
} // namespace random
|
|
|
|
using sprout::random::uniform_real_distribution;
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_RANDOM_UNIFORM_REAL_DISTRIBUTION_HPP
|