Docs: Add references to TopicClassHierarchy

Eigen/src/Core/Array.h

@@ -37,7 +37,7 @@
   * API for the %Matrix class provides easy access to linear-algebra
   * operations.
   *
-  * \sa \ref TutorialArrayClass
+  * \sa \ref TutorialArrayClass, \ref TopicClassHierarchy
   */
 template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
 struct ei_traits<Array<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> > : ei_traits<Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> >

Eigen/src/Core/ArrayBase.h

@@ -44,7 +44,7 @@ template<typename ExpressionType> class MatrixWrapper;
   *
   * \param Derived is the derived type, e.g., an array or an expression type.
   *
-  * \sa class MatrixBase
+  * \sa class MatrixBase, \ref TopicClassHierarchy
   */
 template<typename Derived> class ArrayBase
   : public DenseBase<Derived>

Eigen/src/Core/DenseBase.h

@@ -35,6 +35,8 @@
   * and related expression types). The common Eigen API for dense objects is contained in this class.
   *
   * \param Derived is the derived type, e.g., a matrix type or an expression.
+  *
+  * \sa \ref TopicClassHierarchy
   */
 template<typename Derived> class DenseBase
 #ifndef EIGEN_PARSED_BY_DOXYGEN

Eigen/src/Core/DenseCoeffsBase.h

@@ -33,7 +33,8 @@
   * This class defines the \c operator() \c const function and friends, which can be used to read specific
   * entries of a matrix or array.
   * 
-  * \sa DenseCoeffsBase<Derived, WriteAccessors>, DenseCoeffsBase<Derived, DirectAccessors>
+  * \sa DenseCoeffsBase<Derived, WriteAccessors>, DenseCoeffsBase<Derived, DirectAccessors>,
+  *     \ref TopicClassHierarchy
   */
 template<typename Derived>
 class DenseCoeffsBase<Derived,ReadOnlyAccessors> : public EigenBase<Derived>
@@ -257,7 +258,7 @@ class DenseCoeffsBase<Derived,ReadOnlyAccessors> : public EigenBase<Derived>
   * entries of a matrix or array. This class inherits DenseCoeffsBase<Derived, ReadOnlyAccessors> which
   * defines the const variant for reading specific entries.
   * 
-  * \sa DenseCoeffsBase<Derived, DirectAccessors>
+  * \sa DenseCoeffsBase<Derived, DirectAccessors>, \ref TopicClassHierarchy
   */
 template<typename Derived>
 class DenseCoeffsBase<Derived, WriteAccessors> : public DenseCoeffsBase<Derived, ReadOnlyAccessors>
@@ -543,6 +544,8 @@ class DenseCoeffsBase<Derived, WriteAccessors> : public DenseCoeffsBase<Derived,
   * This class defines functions to work with strides which can be used to access entries directly. This class
   * inherits DenseCoeffsBase<Derived, WriteAccessors> which defines functions to access entries using 
   * \c operator() .
+  *
+  * \sa \ref TopicClassHierarchy
   */
 template<typename Derived>
 class DenseCoeffsBase<Derived, DirectAccessors> : public DenseCoeffsBase<Derived, WriteAccessors>

Eigen/src/Core/DenseStorageBase.h

@@ -36,8 +36,9 @@ template <typename Derived, typename OtherDerived = Derived, bool IsVector = sta
 template<typename MatrixTypeA, typename MatrixTypeB, bool SwapPointers> struct ei_matrix_swap_impl;
 
 /**
-* \brief %Dense storage base class for matrices and arrays.
-**/
+  * \brief %Dense storage base class for matrices and arrays.
+  * \sa \ref TopicClassHierarchy
+  */
 template<typename Derived>
 class DenseStorageBase : public ei_dense_xpr_base<Derived>::type
 {

Eigen/src/Core/EigenBase.h

@@ -34,6 +34,8 @@
   * Besides MatrixBase-derived classes, this also includes special matrix classes such as diagonal matrices, etc.
   *
   * Notice that this class is trivial, it is only used to disambiguate overloaded functions.
+  *
+  * \sa \ref TopicClassHierarchy
   */
 template<typename Derived> struct EigenBase
 {

Eigen/src/Core/Matrix.h

@@ -107,7 +107,7 @@
   * are the dimensions of the original matrix, while _Rows and _Cols are Dynamic.</dd>
   * </dl>
   *
-  * \see MatrixBase for the majority of the API methods for matrices
+  * \see MatrixBase for the majority of the API methods for matrices, \ref TopicClassHierarchy
   */
 template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
 struct ei_traits<Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> >

Eigen/src/Core/MatrixBase.h

@@ -52,6 +52,8 @@
       cout << x.row(0) << endl;
     }
   * \endcode
+  *
+  * \sa \ref TopicClassHierarchy
   */
 template<typename Derived> class MatrixBase
   : public DenseBase<Derived>