mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
#ifndef SPROUT_MATH_COSH_HPP
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#define SPROUT_MATH_COSH_HPP
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#include <cstddef>
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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/factorial.hpp>
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#include <sprout/type_traits/enabler_if.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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cosh_impl(T x2, std::size_t n, std::size_t last) {
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return last - n == 1
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? sprout::detail::pow_n(x2, n) / sprout::math::factorial<T>(2 * n)
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: sprout::math::detail::cosh_impl(x2, n, n + (last - n) / 2)
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+ sprout::math::detail::cosh_impl(x2, n + (last - n) / 2, last)
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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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cosh(FloatType x) {
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typedef double type;
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return static_cast<FloatType>(
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type(1) + sprout::math::detail::cosh_impl(
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static_cast<type>(x) * static_cast<type>(x),
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1, sprout::math::factorial_limit<type>() / 2 + 1
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)
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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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cosh(IntType x) {
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return sprout::math::detail::cosh(static_cast<double>(x));
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}
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} // namespace detail
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using NS_SPROUT_MATH_DETAIL::cosh;
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} // namespace math
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using sprout::math::cosh;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_COSH_HPP
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