Orange/include/Orange/Math/Angle.h

#pragma once

#include <Orange/Math/Unit.h>
#include <Orange/Math/Constants.h>

namespace orange
{
    namespace detail
    {
        template <typename T>
        class Radian;

        template <typename T>
        class Degree : public Unit<Degree, T>
        {
        public:
            constexpr Degree() {}

            constexpr  explicit Degree(T value)
            : Unit<orange::detail::Degree, T>(value)
            {
            }

            constexpr Degree(Unit<orange::detail::Degree, T> value)
            : Unit<orange::detail::Degree, T>(value)
            {
            }

            template <typename U>
            constexpr explicit Degree(Unit<orange::detail::Degree, U> value)
            : Unit<orange::detail::Degree, T>(value)
            {
            }

            constexpr Degree(Unit<Radian, T> value);
        };

        template <typename T>
        class Radian : public Unit<Radian, T>
        {
        public:
            Radian() {}

            constexpr explicit Radian(T value)
            : Unit<orange::detail::Radian, T>(value)
            {
            }

            constexpr Radian(Unit<orange::detail::Radian, T> value)
            : Unit<orange::detail::Radian, T>(value)
            {
            }
            template <typename U>
            constexpr explicit Radian(Unit<orange::detail::Radian, U> value)
            : Unit<orange::detail::Radian, T>(value)
            {
            }

            constexpr Radian(Unit<Degree, T> value);
        };

        template <typename T>
        constexpr Degree<T>::Degree(Unit<Radian, T> value)
        : Unit<orange::detail::Degree, T>(T(360) * T(value) / Math::Tau)
        {
        }

        template <typename T>
        constexpr Radian<T>::Radian(Unit<Degree, T> value)
        : Unit<orange::detail::Radian, T>(T(value) * Math::Tau / T(360))
        {
        }
    }

    using Radian = detail::Radian<float>;
    using Degree = detail::Degree<float>;

    constexpr Radian operator"" _rad(long double value)        { return Radian{static_cast<float>(value)}; }
    constexpr Radian operator"" _rad(unsigned long long value) { return Radian{static_cast<float>(value)}; }

    constexpr Degree operator"" _deg(long double value)        { return Degree{static_cast<float>(value)}; }
    constexpr Degree operator"" _deg(unsigned long long value) { return Degree{static_cast<float>(value)}; }

    struct EulerAngles
    {
        Radian pitch;
        Radian yaw;
        Radian roll;
    };

}