mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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183 lines
7.7 KiB
C++
183 lines
7.7 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_INVERSIVE_CONGRUENTIAL_HPP
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#define SPROUT_RANDOM_INVERSIVE_CONGRUENTIAL_HPP
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#include <cstdint>
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#include <ios>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/random/detail/const_mod.hpp>
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#include <sprout/random/detail/seed_impl.hpp>
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#include <sprout/random/random_result.hpp>
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#include <sprout/random/type_traits.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/math/greater_equal.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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//
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// inversive_congruential_engine
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//
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template<typename IntType, IntType a, IntType b, IntType p>
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class inversive_congruential_engine {
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public:
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typedef IntType result_type;
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private:
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struct private_construct_t {};
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public:
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SPROUT_STATIC_CONSTEXPR result_type multiplier = a;
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SPROUT_STATIC_CONSTEXPR result_type increment = b;
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SPROUT_STATIC_CONSTEXPR result_type modulus = p;
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SPROUT_STATIC_CONSTEXPR result_type default_seed = 1;
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public:
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static SPROUT_CONSTEXPR result_type static_min() SPROUT_NOEXCEPT {
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return increment == 0 ? 1 : 0;
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}
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static SPROUT_CONSTEXPR result_type static_max() SPROUT_NOEXCEPT {
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return modulus - 1;
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}
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static SPROUT_CONSTEXPR result_type init_seed_3(result_type x0) {
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return SPROUT_ASSERT(sprout::math::greater_equal(x0, static_min())), SPROUT_ASSERT(x0 <= static_max()), x0;
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}
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static SPROUT_CONSTEXPR result_type init_seed_2(result_type x0) {
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return init_seed_3(increment == 0 && x0 == 0 ? 1 : x0);
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}
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static SPROUT_CONSTEXPR result_type init_seed_1(result_type x0) {
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return init_seed_2(x0 <= 0 && x0 != 0 ? x0 + modulus : x0);
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}
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static SPROUT_CONSTEXPR result_type init_seed(result_type x0 = default_seed) {
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return init_seed_1(modulus == 0 ? x0 : x0 % modulus);
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}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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static SPROUT_CXX14_CONSTEXPR result_type init_seed(Sseq& seq) {
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return init_seed(sprout::random::detail::seed_one_int<result_type, modulus>(seq));
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}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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static SPROUT_CONSTEXPR result_type init_seed(Sseq const& seq) {
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return init_seed(sprout::random::detail::seed_one_int<result_type, modulus>(seq));
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}
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template<typename InputIterator>
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static SPROUT_CONSTEXPR result_type init_seed(InputIterator first, InputIterator last) {
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return init_seed(sprout::random::detail::get_one_int<result_type, modulus>(first, last));
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}
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private:
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result_type x_;
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private:
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SPROUT_CONSTEXPR inversive_congruential_engine(result_type x, private_construct_t)
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: x_(x)
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{}
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SPROUT_CONSTEXPR sprout::random::random_result<inversive_congruential_engine>
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generate(result_type result) const {
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return sprout::random::random_result<inversive_congruential_engine>(
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result,
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inversive_congruential_engine(result, private_construct_t())
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);
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}
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public:
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SPROUT_CONSTEXPR inversive_congruential_engine()
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: x_(init_seed(default_seed))
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{}
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explicit SPROUT_CONSTEXPR inversive_congruential_engine(result_type x0)
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: x_(init_seed(x0))
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{}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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explicit SPROUT_CXX14_CONSTEXPR inversive_congruential_engine(Sseq& seq)
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: x_(init_seed(seq))
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{}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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explicit SPROUT_CONSTEXPR inversive_congruential_engine(Sseq const& seq)
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: x_(init_seed(seq))
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{}
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template<typename InputIterator>
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SPROUT_CONSTEXPR inversive_congruential_engine(InputIterator first, InputIterator last)
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: x_(init_seed(first, last))
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{}
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SPROUT_CXX14_CONSTEXPR void seed(result_type x0 = default_seed) {
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x_ = init_seed(x0);
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}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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SPROUT_CXX14_CONSTEXPR void seed(Sseq& seq) {
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x_ = init_seed(seq);
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}
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template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
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SPROUT_CXX14_CONSTEXPR void seed(Sseq const& seq) {
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x_ = init_seed(seq);
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}
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template<typename InputIterator>
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SPROUT_CXX14_CONSTEXPR void seed(InputIterator first, InputIterator last) {
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x_ = init_seed(first, last);
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}
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SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
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return static_min();
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}
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SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
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return static_max();
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}
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SPROUT_CXX14_CONSTEXPR result_type operator()() {
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typedef sprout::random::detail::const_mod<result_type, p> do_mod;
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x_ = do_mod::mult_add(a, do_mod::invert(x_), b);
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return x_;
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}
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SPROUT_CONSTEXPR sprout::random::random_result<inversive_congruential_engine> const operator()() const {
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typedef sprout::random::detail::const_mod<result_type, p> do_mod;
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return generate(do_mod::mult_add(a, do_mod::invert(x_), b));
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}
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friend SPROUT_CONSTEXPR bool operator==(inversive_congruential_engine const& lhs, inversive_congruential_engine const& rhs) SPROUT_NOEXCEPT {
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return lhs.x_ == rhs.x_;
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}
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friend SPROUT_CONSTEXPR bool operator!=(inversive_congruential_engine const& lhs, inversive_congruential_engine const& rhs) SPROUT_NOEXCEPT {
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return !(lhs == rhs);
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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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inversive_congruential_engine& rhs
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)
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{
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result_type x;
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if (lhs >> x) {
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if (sprout::math::greater_equal(x, static_min()) && x <= static_max()) {
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rhs.x_ = x;
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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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inversive_congruential_engine const& rhs
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)
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{
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return lhs << rhs.x_;
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}
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};
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template<typename IntType, IntType a, IntType b, IntType p>
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SPROUT_CONSTEXPR_OR_CONST IntType sprout::random::inversive_congruential_engine<IntType, a, b, p>::multiplier;
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template<typename IntType, IntType a, IntType b, IntType p>
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SPROUT_CONSTEXPR_OR_CONST IntType sprout::random::inversive_congruential_engine<IntType, a, b, p>::increment;
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template<typename IntType, IntType a, IntType b, IntType p>
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SPROUT_CONSTEXPR_OR_CONST IntType sprout::random::inversive_congruential_engine<IntType, a, b, p>::modulus;
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template<typename IntType, IntType a, IntType b, IntType p>
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SPROUT_CONSTEXPR_OR_CONST IntType sprout::random::inversive_congruential_engine<IntType, a, b, p>::default_seed;
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//
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// hellekalek1995
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//
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typedef sprout::random::inversive_congruential_engine<std::uint_fast32_t, 9102, 2147483647 - 36884165, 2147483647> hellekalek1995;
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} // namespace random
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using sprout::random::inversive_congruential_engine;
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using sprout::random::hellekalek1995;
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_INVERSIVE_CONGRUENTIAL_HPP
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