template < unsigned int stride = 0 >
class __Vector4
{
private:
    __declspec(align(16)) union
    {
        __declspec(align(16)) __m128  vec;
        __declspec(align(16)) float   f [ 4 ];
    };

    // Constructores.
public:
    __Vector4 ()
    : f ( { 0, 0, 0, 0 } )
    {
#ifdef _DEBUG
        assert ( ( (unsigned int)&f[0] % 16 ) == 0 );
#endif
    }