template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
struct Eigen::doxygen::dense_xpr_base_dispatcher< Array< _Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols > >
This class is just a workaround for Doxygen and it does not not actually exist.