diff --git a/Eigen/src/Core/Eval.h b/Eigen/src/Core/Eval.h
index abb8cafcd..b41ee0d7c 100644
--- a/Eigen/src/Core/Eval.h
+++ b/Eigen/src/Core/Eval.h
@@ -55,13 +55,15 @@ template<typename Expression> class Eval : NoOperatorEquals,
 {
   public:
     typedef typename Expression::Scalar Scalar;
-    typedef Matrix<Scalar, Expression::Traits::RowsAtCompileTime, Expression::Traits::ColsAtCompileTime, EIGEN_DEFAULT_MATRIX_STORAGE_ORDER,
-                 Expression::Traits::MaxRowsAtCompileTime,
-                 Expression::Traits::MaxColsAtCompileTime> MatrixType;
-    typedef Expression Base;
-    friend class MatrixBase<Scalar, Expression>;
-    
-    Eval(const Expression& expression) : MatrixType(expression) {}
+    typedef Matrix<Scalar,
+                   Expression::Traits::RowsAtCompileTime,
+                   Expression::Traits::ColsAtCompileTime,
+                   EIGEN_DEFAULT_MATRIX_STORAGE_ORDER,
+                   Expression::Traits::MaxRowsAtCompileTime,
+                   Expression::Traits::MaxColsAtCompileTime> Base;
+
+    Eval() : Base() {}
+    explicit Eval(const Expression& other) : Base(other) {}
 };
 
 /** Evaluates *this, which can be any expression, and returns the obtained matrix.
diff --git a/Eigen/src/Core/Matrix.h b/Eigen/src/Core/Matrix.h
index 6a1d22fda..df68553bf 100644
--- a/Eigen/src/Core/Matrix.h
+++ b/Eigen/src/Core/Matrix.h
@@ -149,6 +149,19 @@ class Matrix : public MatrixBase<_Scalar, Matrix<_Scalar, _Rows, _Cols,
     }
     
   public:
+    typedef Matrix<
+      Scalar,
+      RowsAtCompileTime == 1 ? 1 : Dynamic,
+      ColsAtCompileTime == 1 ? 1 : Dynamic,
+      StorageOrder,
+      RowsAtCompileTime == 1 ? 1 : MaxRowsAtCompileTime,
+      ColsAtCompileTime == 1 ? 1 : MaxColsAtCompileTime
+    > BlockType;
+    typedef Matrix<Scalar, RowsAtCompileTime, 1,
+                   StorageOrder, MaxRowsAtCompileTime, 1> ColumnType;
+    typedef Matrix<Scalar, 1, ColsAtCompileTime,
+                   StorageOrder, 1, MaxColsAtCompileTime> RowType;
+
     /** \returns a const pointer to the data array of this matrix */
     const Scalar *data() const
     { return m_array.data(); }