mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
#ifndef SPROUT_MATH_POW_HPP
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#define SPROUT_MATH_POW_HPP
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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/math/detail/config.hpp>
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#include <sprout/math/exp.hpp>
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#include <sprout/math/log.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/type_traits/float_promote.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<
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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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pow(FloatType x, FloatType y) {
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return x == 0
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? y < 0 ? std::numeric_limits<FloatType>::infinity()
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: y > 0 ? FloatType(0)
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: sprout::math::exp(y * sprout::math::log(x))
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: x == -1 && (y == std::numeric_limits<FloatType>::infinity() || y == -std::numeric_limits<FloatType>::infinity()) ? FloatType(1)
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: x == 1 ? FloatType(1)
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: y == 0 ? FloatType(1)
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: y == -std::numeric_limits<FloatType>::infinity()
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? x < 1 && x > -1 ? std::numeric_limits<FloatType>::infinity()
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: x > 1 || x < -1 ? FloatType(0)
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: sprout::math::exp(y * sprout::math::log(x))
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: y == std::numeric_limits<FloatType>::infinity()
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? x < 1 && x > -1 ? FloatType(0)
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: x > 1 || x < -1 ? std::numeric_limits<FloatType>::infinity()
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: sprout::math::exp(y * sprout::math::log(x))
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: x == -std::numeric_limits<FloatType>::infinity()
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? y < 0 ? FloatType(0)
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: y > 0 ? std::numeric_limits<FloatType>::infinity()
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: sprout::math::exp(y * sprout::math::log(x))
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: x == std::numeric_limits<FloatType>::infinity()
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? y < 0 ? FloatType(0)
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: y > 0 ? std::numeric_limits<FloatType>::infinity()
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: sprout::math::exp(y * sprout::math::log(x))
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: sprout::math::exp(y * sprout::math::log(x))
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;
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}
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template<
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typename ArithmeticType1,
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typename ArithmeticType2,
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typename sprout::enabler_if<
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std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value
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>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type
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pow(ArithmeticType1 x, ArithmeticType2 y) {
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typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
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return sprout::math::detail::pow(static_cast<type>(x), static_cast<type>(y));
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}
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} // namespace detail
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using NS_SPROUT_MATH_DETAIL::pow;
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} // namespace math
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using sprout::math::pow;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_POW_HPP
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