mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_MATH_LOG_A_HPP
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#define SPROUT_MATH_LOG_A_HPP
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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/detail/float_compute.hpp>
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#include <sprout/math/constants.hpp>
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#include <sprout/math/log.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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log_a_impl(T x, T y) {
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return x == 2 ? sprout::math::log(y) / sprout::math::ln_two<T>()
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: x == 10 ? sprout::math::log(y) / sprout::math::ln_ten<T>()
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: sprout::math::log(y) / sprout::math::log(x)
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;
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}
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} // namespace detail
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//
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// log_a
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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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log_a(FloatType x, FloatType y) {
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return static_cast<FloatType>(sprout::math::detail::log_a_impl(
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static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x),
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static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(y)
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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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log_a(ArithmeticType1 x, ArithmeticType2 y) {
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typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type;
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return sprout::math::log_a(static_cast<type>(x), static_cast<type>(y));
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}
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} // namespace math
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using sprout::math::log_a;
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} // namespace sprout
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#endif // #ifndef SPROUT_MATH_LOG_A_HPP
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