finally add a Array class with storage via the introduction of a DenseStorageBase

base class shared by both Matrix and Array

Eigen/src/Core/util/ForwardDeclarations.h

@@ -115,6 +115,9 @@ template<typename Scalar1,typename Scalar2> struct ei_scalar_multiple2_op;
 struct IOFormat;
 
 // Array module
+template<typename _Scalar, int _Rows, int _Cols,
+         int _Options = EIGEN_DEFAULT_MATRIX_STORAGE_ORDER_OPTION | AutoAlign,
+         int _MaxRows = _Rows, int _MaxCols = _Cols> class Array;
 template<typename ConditionMatrixType, typename ThenMatrixType, typename ElseMatrixType> class Select;
 template<typename MatrixType, typename BinaryOp, int Direction> class PartialReduxExpr;
 template<typename ExpressionType, int Direction> class VectorwiseOp;

Eigen/src/Core/util/Macros.h

@@ -353,4 +353,17 @@ using Eigen::ei_cos;
     return CwiseBinaryOp<FUNCTOR<Scalar>, Derived, OtherDerived>(derived(), other.derived()); \
   }
 
+// the expression type of a cwise product
+#define EIGEN_CWISE_PRODUCT_RETURN_TYPE(LHS,RHS) \
+    CwiseBinaryOp< \
+      ei_scalar_product_op< \
+        typename ei_scalar_product_traits< \
+          typename ei_traits<LHS>::Scalar, \
+          typename ei_traits<RHS>::Scalar \
+        >::ReturnType \
+      >, \
+      LHS, \
+      RHS \
+    >
+
 #endif // EIGEN_MACROS_H