/*============================================================================= Copyright (c) 2011-2016 Bolero MURAKAMI https://github.com/bolero-MURAKAMI/Sprout Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ #ifndef SPROUT_MATH_LOG_A_HPP #define SPROUT_MATH_LOG_A_HPP #include <type_traits> #include <sprout/config.hpp> #include <sprout/math/detail/config.hpp> #include <sprout/math/detail/float_compute.hpp> #include <sprout/math/constants.hpp> #include <sprout/math/log.hpp> #include <sprout/type_traits/enabler_if.hpp> #include <sprout/type_traits/float_promote.hpp> namespace sprout { namespace math { namespace detail { template<typename T> inline SPROUT_CONSTEXPR T log_a_impl(T x, T y) { return x == 2 ? sprout::math::log(y) / sprout::math::ln_two<T>() : x == 10 ? sprout::math::log(y) / sprout::math::ln_ten<T>() : sprout::math::log(y) / sprout::math::log(x) ; } } // namespace detail // // log_a // template< typename FloatType, typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler > inline SPROUT_CONSTEXPR FloatType log_a(FloatType x, FloatType y) { return static_cast<FloatType>(sprout::math::detail::log_a_impl( static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x), static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(y) )); } template< typename ArithmeticType1, typename ArithmeticType2, typename sprout::enabler_if< std::is_arithmetic<ArithmeticType1>::value && std::is_arithmetic<ArithmeticType2>::value >::type = sprout::enabler > inline SPROUT_CONSTEXPR typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type log_a(ArithmeticType1 x, ArithmeticType2 y) { typedef typename sprout::float_promote<ArithmeticType1, ArithmeticType2>::type type; return sprout::math::log_a(static_cast<type>(x), static_cast<type>(y)); } } // namespace math using sprout::math::log_a; } // namespace sprout #endif // #ifndef SPROUT_MATH_LOG_A_HPP