mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
#ifndef SPROUT_RANDOM_UNIFORM_01_HPP
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#define SPROUT_RANDOM_UNIFORM_01_HPP
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#include <iosfwd>
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#include <istream>
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#include <limits>
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#include <sprout/config.hpp>
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#include <sprout/random/random_result.hpp>
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namespace sprout {
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namespace random {
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//
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// uniform_01
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//
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template<typename RealType = double>
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class uniform_01 {
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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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private:
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template<typename Engine>
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SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_01> generate_1(
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Engine const& eng,
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sprout::random::random_result<Engine> const& rnd,
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result_type result
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) const
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{
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return result < result_type(1)
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? sprout::random::random_result<Engine, uniform_01>(result, rnd.engine(), *this)
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: operator()(rnd.engine())
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;
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}
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template<typename Engine>
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SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_01> generate(
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Engine const& eng,
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sprout::random::random_result<Engine> const& rnd
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) const
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{
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typedef typename Engine::result_type base_result;
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return generate_1(
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eng,
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rnd,
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result_type(rnd.result() - eng.min()) * (
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result_type(1) / (
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result_type(eng.max() - eng.min()) + result_type(
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std::numeric_limits<base_result>::is_integer ? 1 : 0
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)
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)
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)
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);
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}
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public:
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SPROUT_CONSTEXPR result_type min() const {
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return result_type(0);
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}
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SPROUT_CONSTEXPR result_type max() const {
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return result_type(1);
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}
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template<typename Engine>
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SPROUT_CONSTEXPR sprout::random::random_result<Engine, uniform_01> operator()(Engine const& eng) const {
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return generate(eng, eng());
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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_istream<Elem, Traits>& lhs,
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uniform_01 const& rhs
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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 std::basic_ostream<Elem, Traits>& operator<<(
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std::basic_ostream<Elem, Traits>& lhs,
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uniform_01 const& rhs
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)
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{
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return lhs;
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}
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SPROUT_CONSTEXPR friend bool operator==(uniform_01 const& lhs, uniform_01 const& rhs) {
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return true;
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}
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SPROUT_CONSTEXPR friend bool operator!=(uniform_01 const& lhs, uniform_01 const& rhs) {
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return !(lhs == rhs);
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}
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};
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} // namespace random
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using sprout::random::uniform_01;
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_UNIFORM_01_HPP
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