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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2008-2009 Gael Guennebaud <g.gael@free.fr>
+// Copyright (C) 2006-2008 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_SPARSENESTBYVALUE_H
+#define EIGEN_SPARSENESTBYVALUE_H
+
+/** \class SparseNestByValue
+  *
+  * \brief Expression which must be nested by value
+  *
+  * \param ExpressionType the type of the object of which we are requiring nesting-by-value
+  *
+  * This class is the return type of MatrixBase::nestByValue()
+  * and most of the time this is the only way it is used.
+  *
+  * \sa SparseMatrixBase::nestByValue(), class NestByValue
+  */
+template<typename ExpressionType>
+struct ei_traits<SparseNestByValue<ExpressionType> > : public ei_traits<ExpressionType>
+{};
+
+template<typename ExpressionType> class SparseNestByValue
+  : public SparseMatrixBase<SparseNestByValue<ExpressionType> >
+{
+  public:
+
+    typedef typename ExpressionType::InnerIterator InnerIterator;
+
+    EIGEN_SPARSE_GENERIC_PUBLIC_INTERFACE(SparseNestByValue)
+
+    inline SparseNestByValue(const ExpressionType& matrix) : m_expression(matrix) {}
+
+    EIGEN_STRONG_INLINE int rows() const { return m_expression.rows(); }
+    EIGEN_STRONG_INLINE int cols() const { return m_expression.cols(); }
+
+    operator const ExpressionType&() const { return m_expression; }
+
+  protected:
+    const ExpressionType m_expression;
+};
+
+/** \returns an expression of the temporary version of *this.
+  */
+template<typename Derived>
+inline const SparseNestByValue<Derived>
+SparseMatrixBase<Derived>::nestByValue() const
+{
+  return SparseNestByValue<Derived>(derived());
+}
+
+// template<typename MatrixType>
+// class SparseNestByValue<MatrixType>::InnerIterator : public MatrixType::InnerIterator
+// {
+//     typedef typename MatrixType::InnerIterator Base;
+//   public:
+// 
+//     EIGEN_STRONG_INLINE InnerIterator(const SparseNestByValue& expr, int outer)
+//       : Base(expr.m_expression, outer)
+//     {}
+// };
+
+#endif // EIGEN_SPARSENESTBYVALUE_H