Class vec3

jni/venus/vec3.h:11–280

template <typename T>
class vec3
{
public:
// https://msdn.microsoft.com/en-us/library/2c8f766e.aspx
#ifdef _WIN32
#  pragma warning(push)
#  pragma warning(disable: 4201)  // warning C4201: nonstandard extension used: nameless struct/union
#endif

	union
	{
		T _data[3];
		struct { T x, y, z; };  // vertex
		struct { T r, g, b; };  // color
		struct { T u, v, w; };  // texture
		struct { T s, t, p; };  // texture
		struct { T i, j, k; };  // index
		struct { T start, step, stop; }; // arithmetic progression
		struct { T pitch, roll, yaw; };
		struct { T rho, theta, phi; };  // polar coordinate
		struct { T constant, linear, quadratic; };  // attenuation
	};

#ifdef _WIN32
#  pragma warning(pop)
#endif

	typedef T value_type;

public:
	vec3()  = default;
	~vec3() = default;

	explicit vec3(const T *array): x(array[0]), y(array[1]), z(array[2]) { }
	explicit vec3(T scalar): x(scalar), y(scalar), z(scalar) { }
	vec3(T x, T y, T z): x(x), y(y), z(z) { }

	vec3(const vec3<T>& v): x(v.x), y(v.y), z(v.z) { }
	vec3<T>& operator =(const vec3<T>& rhs)
	{
		if(this != &rhs)
		{
			x = rhs.x;
			y = rhs.y;
			z = rhs.z;
		}
		return *this;
	}

	vec3<T>& operator =(const vec3<T>&& rhs)
	{
		x = rhs.x;
		y = rhs.y;
		z = rhs.z;
		return *this;
	}

	T& operator[] (std::size_t i) { return _data[i]; }