Degrees.hpp

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#pragma once
 
#include <AH/STL/type_traits>
#include <AH/Settings/NamespaceSettings.hpp>
 
BEGIN_AH_NAMESPACE
 
namespace detail {
constexpr long double pi_inv_l = 0.318309886183790671537767526745028724L;
constexpr long double pi_l = 3.141592653589793238462643383279502884L;
} // namespace detail


template <class T>
constexpr inline
    typename std::enable_if<std::is_floating_point<T>::value, T>::type
    rad2deg(T r) {
    return r * static_cast<T>(detail::pi_inv_l) * 180;
}

template <class T>
constexpr inline
    typename std::enable_if<std::is_floating_point<T>::value, T>::type
    deg2rad(T d) {
    return d * static_cast<T>(detail::pi_l) / 180;
}

constexpr long double operator"" _deg(long double deg) { return deg2rad(deg); }
constexpr long double operator"" _deg(unsigned long long deg) {
    return deg2rad(static_cast<long double>(deg));
}

 
END_AH_NAMESPACE