42_vox/ScopEngine/Runtime/Includes/Maths/Constants.h

#ifndef __SCOP_MATHS_CONSTANTS__
#define __SCOP_MATHS_CONSTANTS__

#include <climits>
#include <limits>
#include <type_traits>

namespace Scop
{
	template<typename T> constexpr std::size_t BitCount = CHAR_BIT * sizeof(T);

	template<typename T>
	struct MathConstants
	{
		static constexpr T Infinity()
		{
			static_assert(std::numeric_limits<T>::has_infinity);
			return std::numeric_limits<T>::infinity();
		}

		static constexpr T Max()
		{
			return std::numeric_limits<T>::max();
		}

		static constexpr T Min()
		{
			return std::numeric_limits<T>::min();
		}

		static constexpr T NaN()
		{
			static_assert(std::numeric_limits<T>::has_signaling_NaN);
			return std::numeric_limits<T>::quiet_NaN();
		}

		// Math constants
		static constexpr T HalfPi()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(1.5707963267948966192313216916398);
		}

		static constexpr T Pi()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(3.1415926535897932384626433832795);
		}

		static constexpr T Sqrt2()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(1.4142135623730950488016887242097);
		}

		static constexpr T Sqrt3()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(1.7320508075688772935274463415059);
		}

		static constexpr T Sqrt5()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(2.2360679774997896964091736687313);
		}

		static constexpr T Tau()
		{
			static_assert(std::is_floating_point_v<T>);
			return T(6.2831853071795864769252867665590);
		}
	};

	template<typename T = void> constexpr auto Infinity() { return MathConstants<T>::Infinity(); }
	template<typename T = void> constexpr auto MaxValue() { return MathConstants<T>::Max(); }
	template<typename T = void> constexpr auto MinValue() { return MathConstants<T>::Min(); }
	template<typename T = void> constexpr auto NaN() { return MathConstants<T>::NaN(); }
	template<typename T = void> constexpr auto HalfPi() { return MathConstants<T>::HalfPi(); }
	template<typename T = void> constexpr auto Pi() { return MathConstants<T>::Pi(); }
	template<typename T = void> constexpr auto Sqrt2() { return MathConstants<T>::Sqrt2(); }
	template<typename T = void> constexpr auto Sqrt3() { return MathConstants<T>::Sqrt3(); }
	template<typename T = void> constexpr auto Sqrt5() { return MathConstants<T>::Sqrt5(); }
	template<typename T = void> constexpr auto Tau() { return MathConstants<T>::Tau(); }
}

#endif