text: /*=============================================================================
    Copyright (c) 2011-2014 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_LOG10_HPP
  #define SPROUT_MATH_LOG10_HPP
  
  #include <type_traits>
  #include <sprout/config.hpp>
  #include <sprout/limits.hpp>
  #include <sprout/math/detail/config.hpp>
  #include <sprout/math/detail/float_compute.hpp>
  #include <sprout/math/constants.hpp>
  #include <sprout/math/isnan.hpp>
  #include <sprout/math/log.hpp>
  #include <sprout/type_traits/enabler_if.hpp>
  
  namespace sprout {
  	namespace math {
  		namespace detail {
  #if SPROUT_USE_BUILTIN_CMATH_FUNCTION
  			inline SPROUT_CONSTEXPR float
  			builtin_log10(float x) {
  				return __builtin_log10f(x);
  			}
  			inline SPROUT_CONSTEXPR double
  			builtin_log10(double x) {
  				return __builtin_log10(x);
  			}
  			inline SPROUT_CONSTEXPR long double
  			builtin_log10(long double x) {
  				return __builtin_log10l(x);
  			}
  #endif
  
  			template<typename T>
  			inline SPROUT_CONSTEXPR T
  			log10_impl(T x) {
  				return sprout::math::log(x) / sprout::math::ln_ten<T>();
  			}
  		}	// namespace detail
  		//
  		// log10
  		//
  		template<
  			typename FloatType,
  			typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
  		>
  		inline SPROUT_CONSTEXPR FloatType
  		log10(FloatType x) {
  			return sprout::math::isnan(x) ? x
  				: x == 0 ? -sprout::numeric_limits<FloatType>::infinity()
  				: x == sprout::numeric_limits<FloatType>::infinity() ? sprout::numeric_limits<FloatType>::infinity()
  				: x < 0 ? sprout::numeric_limits<FloatType>::quiet_NaN()
  #if SPROUT_USE_BUILTIN_CMATH_FUNCTION
  				: sprout::math::detail::builtin_log10(x)
  #else
  				: x == 1 ? FloatType(0)
  				: static_cast<FloatType>(sprout::math::detail::log10_impl(static_cast<typename sprout::math::detail::float_compute<FloatType>::type>(x)))
  #endif
  				;
  		}
  		template<
  			typename IntType,
  			typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
  		>
  		inline SPROUT_CONSTEXPR double
  		log10(IntType x) {
  			return sprout::math::log10(static_cast<double>(x));
  		}
  	}	// namespace math
  
  	using sprout::math::log10;
  }	// namespace sprout
  
  #endif	// #ifndef SPROUT_MATH_LOG10_HPP
  