#ifndef COMMON_ALNUMBERS_H #define COMMON_ALNUMBERS_H #include <utility> namespace al { namespace numbers { namespace detail_ { template<typename T> using as_fp = std::enable_if_t<std::is_floating_point<T>::value, T>; } // detail_ template<typename T> static constexpr auto pi_v = detail_::as_fp<T>(3.141592653589793238462643383279502884L); template<typename T> static constexpr auto inv_pi_v = detail_::as_fp<T>(0.318309886183790671537767526745028724L); template<typename T> static constexpr auto sqrt2_v = detail_::as_fp<T>(1.414213562373095048801688724209698079L); template<typename T> static constexpr auto sqrt3_v = detail_::as_fp<T>(1.732050807568877293527446341505872367L); static constexpr auto pi = pi_v<double>; static constexpr auto inv_pi = inv_pi_v<double>; static constexpr auto sqrt2 = sqrt2_v<double>; static constexpr auto sqrt3 = sqrt3_v<double>; } // namespace numbers } // namespace al #endif /* COMMON_ALNUMBERS_H */