diff --git a/Eigen/src/Core/DenseDirectAccessBase.h b/Eigen/src/Core/DenseDirectAccessBase.h
new file mode 100644
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+++ b/Eigen/src/Core/DenseDirectAccessBase.h
@@ -0,0 +1,138 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_DENSEDIRECTACCESSBASE_H
+#define EIGEN_DENSEDIRECTACCESSBASE_H
+
+template<typename Derived> struct ei_has_direct_access
+{
+  enum { ret = (ei_traits<Derived>::Flags & DirectAccessBit) ? 1 : 0 };
+};
+
+template<typename Derived, bool _HasDirectAccess = ei_has_direct_access<Derived>::ret>
+struct ei_inner_stride_at_compile_time
+{
+  enum { ret = ei_traits<Derived>::InnerStrideAtCompileTime };
+};
+
+template<typename Derived>
+struct ei_inner_stride_at_compile_time<Derived, false>
+{
+  enum { ret = 0 };
+};
+
+template<typename Derived, bool _HasDirectAccess = ei_has_direct_access<Derived>::ret>
+struct ei_outer_stride_at_compile_time
+{
+  enum { ret = ei_traits<Derived>::OuterStrideAtCompileTime };
+};
+
+template<typename Derived>
+struct ei_outer_stride_at_compile_time<Derived, false>
+{
+  enum { ret = 0 };
+};
+
+template<typename Derived, typename XprKind = typename ei_traits<Derived>::XprKind>
+struct ei_dense_xpr_base
+{
+  /* ei_dense_xpr_base should only ever be used on dense expressions, thus falling either into the MatrixXpr or into the ArrayXpr cases */
+};
+
+template<typename Derived>
+struct ei_dense_xpr_base<Derived, MatrixXpr>
+{
+  typedef MatrixBase<Derived> type;
+};
+
+template<typename Derived>
+struct ei_dense_xpr_base<Derived, ArrayXpr>
+{
+  typedef ArrayBase<Derived> type;
+};
+
+template<typename Derived> class DenseDirectAccessBase
+  : public ei_dense_xpr_base<Derived>::type
+{
+  public:
+
+    typedef typename ei_dense_xpr_base<Derived>::type Base;
+
+    using Base::IsVectorAtCompileTime;
+    using Base::IsRowMajor;
+    using Base::derived;
+    using Base::operator=;
+
+    typedef typename Base::CoeffReturnType CoeffReturnType;
+
+    enum {
+      InnerStrideAtCompileTime = ei_traits<Derived>::InnerStrideAtCompileTime,
+      OuterStrideAtCompileTime = ei_traits<Derived>::OuterStrideAtCompileTime
+    };
+
+    /** \returns the pointer increment between two consecutive elements within a slice in the inner direction.
+      *
+      * \sa outerStride(), rowStride(), colStride()
+      */
+    inline int innerStride() const
+    {
+      return derived().innerStride();
+    }
+
+    /** \returns the pointer increment between two consecutive inner slices (for example, between two consecutive columns
+      *          in a column-major matrix).
+      *
+      * \sa innerStride(), rowStride(), colStride()
+      */
+    inline int outerStride() const
+    {
+      return derived().outerStride();
+    }
+
+    inline int stride() const
+    {
+      return IsVectorAtCompileTime ? innerStride() : outerStride();
+    }
+
+    /** \returns the pointer increment between two consecutive rows.
+      *
+      * \sa innerStride(), outerStride(), colStride()
+      */
+    inline int rowStride() const
+    {
+      return IsRowMajor ? outerStride() : innerStride();
+    }
+
+    /** \returns the pointer increment between two consecutive columns.
+      *
+      * \sa innerStride(), outerStride(), rowStride()
+      */
+    inline int colStride() const
+    {
+      return IsRowMajor ? innerStride() : outerStride();
+    }
+
+};
+
+#endif // EIGEN_DENSEDIRECTACCESSBASE_H