template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
Eigen::doxygen::dense_xpr_base_dispatcher<Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols>> struct

This class is just a workaround for Doxygen and it does not not actually exist.

Base classes

template<typename Derived>
class Eigen::MatrixBase
Base class for all dense matrices, vectors, and expressions.

Derived classes

template<typename Derived>
class Eigen::PlainObjectBase
Dense storage base class for matrices and arrays.