#ifndef SPROUT_MATH_ACOS_HPP #define SPROUT_MATH_ACOS_HPP #include #include #include #include #include #include #include namespace sprout { namespace math { namespace detail { template< typename FloatType, typename sprout::enabler_if::value>::type = sprout::enabler > inline SPROUT_CONSTEXPR FloatType acos(FloatType x) { return x == 1 ? FloatType(0) : x > 1 || x < -1 ? std::numeric_limits::quiet_NaN() : sprout::math::half_pi() - sprout::math::asin(x) ; } template< typename IntType, typename sprout::enabler_if::value>::type = sprout::enabler > inline SPROUT_CONSTEXPR double acos(IntType x) { return sprout::math::detail::acos(static_cast(x)); } } // namespace detail using NS_SPROUT_MATH_DETAIL::acos; } // namespace math using sprout::math::acos; } // namespace sprout #endif // #ifndef SPROUT_MATH_ACOS_HPP