i have this c struct from a third party library:

typedef struct Point3d
{
  enum{ SIZE = 3 };
  typedef double value_type;                                          ///< type export 
  double&       operator[](size_t index)       { return vec[index];}  ///< random-access
  const double& operator[](size_t index) const { return vec[index];}  ///< random-access

  double vec[3];        ///< point data, e.g. 0=x,1=y,2=z
  void* data; ///< pointer to additional user-defined data
} Point3d;

this struct is used as an array like this:

Point3d* mypoints = new Point3d[200];

i now want to map this array – specifically the 3 doubles saved in Point3d::vec – to an Eigen::Matrix<double, 3, Eigen::Dynamic>.
I do this by following this answer:

/a/58980755/10825362

which resulted in this function:

Eigen::Matrix<double, 3, Eigen::Dynamic> exportToEigen(Point3d *points, int size)
{
    Eigen::MatrixXd result(size, 3);
    constexpr int stride = sizeof(ALG3D_Point3d)/sizeof(double);

    Eigen::VectorXd X = 
        Eigen::Map<Eigen::VectorXd, Eigen::Unaligned, Eigen::InnerStride<stride>>(
            &points[0].vec[0], size
        );

    Eigen::VectorXd Y = 
        Eigen::Map<Eigen::VectorXd, Eigen::Unaligned, Eigen::InnerStride<stride>>(
            &points[0].vec[1], size
        );

    Eigen::VectorXd Z = 
        Eigen::Map<Eigen::VectorXd, Eigen::Unaligned, Eigen::InnerStride<stride>>(
            &points[0].vec[2], size
        );

    result << X, Y, Z;
    return result.transpose();
}

now i was wondering if this can be done without the need for the temporary X, Y, Z Eigen::VectorXds?