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- #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 */
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