mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
#ifndef SPROUT_MATH_SINH_HPP
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#define SPROUT_MATH_SINH_HPP
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#include <cstddef>
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#include <limits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/detail/pow.hpp>
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#include <sprout/math/detail/config.hpp>
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#include <sprout/math/detail/float_compute.hpp>
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#include <sprout/math/copysign.hpp>
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#include <sprout/math/factorial.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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#include <sprout/type_traits/float_promote.hpp>
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namespace sprout {
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namespace math {
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namespace detail {
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template<typename T>
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inline SPROUT_CONSTEXPR T
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sinh_impl_1(T x, std::size_t n, std::size_t last) {
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return last - n == 1
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? sprout::detail::pow_n(x, 2 * n + 1) / sprout::math::unchecked_factorial<T>(2 * n + 1)
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: sprout::math::detail::sinh_impl_1(x, n, n + (last - n) / 2)
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+ sprout::math::detail::sinh_impl_1(x, n + (last - n) / 2, last)
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;
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}
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template<typename T>
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inline SPROUT_CONSTEXPR T
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sinh_impl(T x) {
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return x + sprout::math::detail::sinh_impl_1(
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x,
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1, (sprout::math::factorial_limit<T>() - 1) / 2 + 1
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);
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}
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template<
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typename FloatType,
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typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR FloatType
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sinh(FloatType x) {
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return x == std::numeric_limits<FloatType>::infinity() ? std::numeric_limits<FloatType>::infinity()
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: x == -std::numeric_limits<FloatType>::infinity() ? -std::numeric_limits<FloatType>::infinity()
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#if SPROUT_USE_BUILTIN_CMATH_FUNCTION
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: std::sinh(x)
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#else
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: x == 0 ? sprout::math::copysign(FloatType(0), x)
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: static_cast<FloatType>(sprout::math::detail::sinh_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
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#endif
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;
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}
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template<
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typename IntType,
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typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR double
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sinh(IntType x) {
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return sprout::math::detail::sinh(static_cast<double>(x));
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}
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} // namespace detail
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//
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// sinh
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//
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template<
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typename ArithmeticType,
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typename sprout::enabler_if<std::is_arithmetic<ArithmeticType>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType>::type
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sinh(ArithmeticType x) {
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return sprout::math::detail::sinh(x);
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}
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} // namespace math
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using sprout::math::sinh;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_SINH_HPP
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