mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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91 lines
3 KiB
C++
91 lines
3 KiB
C++
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#ifndef SPROUT_RANDOM_XOR_COMBINE_HPP
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#define SPROUT_RANDOM_XOR_COMBINE_HPP
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#include <ios>
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#include <istream>
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#include <sprout/config.hpp>
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#include <sprout/random/random_result.hpp>
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#include HDR_ALGORITHM_SSCRISK_CEL_OR_SPROUT_DETAIL
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namespace sprout {
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namespace random {
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//
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// xor_combine_engine
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//
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template<typename URNG1, int s1, typename URNG2, int s2>
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class xor_combine_engine {
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public:
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typedef URNG1 base1_type;
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typedef URNG2 base2_type;
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typedef typename base1_type::result_type result_type;
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public:
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SPROUT_STATIC_CONSTEXPR int shift1 = s1;
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SPROUT_STATIC_CONSTEXPR int shift2 = s2;
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private:
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base1_type rng1_;
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base2_type rng2_;
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private:
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template<typename Random1, typename Random2>
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SPROUT_CONSTEXPR sprout::random::random_result<xor_combine_engine> generate(Random1 const& rnd1, Random2 const& rnd2) const {
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return sprout::random::random_result<xor_combine_engine>(
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(rnd1.result() << s1) ^ (rnd2.result() << s2),
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xor_combine_engine(
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rnd1.engine(),
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rnd2.engine()
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)
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);
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}
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public:
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SPROUT_CONSTEXPR xor_combine_engine()
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: rng1_()
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, rng2_()
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{}
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SPROUT_CONSTEXPR explicit xor_combine_engine(result_type const& seed)
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: rng1_(seed)
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, rng2_(seed)
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{}
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SPROUT_CONSTEXPR xor_combine_engine(base1_type const& rng1, base2_type const& rng2)
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: rng1_(rng1)
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, rng2_(rng2)
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{}
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SPROUT_CONSTEXPR result_type min() const {
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return NS_SSCRISK_CEL_OR_SPROUT_DETAIL::min(rng1_.min(), rng2_.min());
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}
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SPROUT_CONSTEXPR result_type max() const {
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return NS_SSCRISK_CEL_OR_SPROUT_DETAIL::max(rng1_.max(), rng2_.max());
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}
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SPROUT_CONSTEXPR sprout::random::random_result<xor_combine_engine> operator()() const {
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return generate(rng1_(), rng2_());
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}
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friend SPROUT_CONSTEXPR bool operator==(xor_combine_engine const& lhs, xor_combine_engine const& rhs) {
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return lhs.rng1_ == rhs.rng1_ && lhs.rng2_ == rhs.rng2_;
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}
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friend SPROUT_CONSTEXPR bool operator!=(xor_combine_engine const& lhs, xor_combine_engine const& rhs) {
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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 std::basic_istream<Elem, Traits>& operator>>(
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std::basic_istream<Elem, Traits>& lhs,
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xor_combine_engine& rhs
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)
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{
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return lhs >> rhs.rng1_ >> std::ws >> rhs.rng2_;
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}
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template<typename Elem, typename Traits>
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friend std::basic_ostream<Elem, Traits>& operator<<(
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std::basic_ostream<Elem, Traits>& lhs,
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xor_combine_engine const& rhs
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)
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{
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return lhs << rhs.rng1_ << ' ' << rhs.rng2_;
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}
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};
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template<typename URNG1, int s1, typename URNG2, int s2>
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SPROUT_CONSTEXPR int sprout::random::xor_combine_engine<URNG1, s1, URNG2, s2>::shift1;
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template<typename URNG1, int s1, typename URNG2, int s2>
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SPROUT_CONSTEXPR int sprout::random::xor_combine_engine<URNG1, s1, URNG2, s2>::shift2;
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} // namespace random
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_XOR_COMBINE_HPP
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