From 99d952466f23308f87a7edda1d6b833cdd391754 Mon Sep 17 00:00:00 2001
From: Hauke Heibel <hauke.heibel@gmail.com>
Date: Tue, 15 Jun 2010 10:26:12 +0200
Subject: [PATCH] This scalar needs to be passed by ref to preserve its
 alignment.

---
 Eigen/src/Core/MatrixBase.h   | 2 +-
 Eigen/src/Sparse/SparseView.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Eigen/src/Core/MatrixBase.h b/Eigen/src/Core/MatrixBase.h
index 986806e43..ac5951d1e 100644
--- a/Eigen/src/Core/MatrixBase.h
+++ b/Eigen/src/Core/MatrixBase.h
@@ -226,7 +226,7 @@ template<typename Derived> class MatrixBase
     template<unsigned int UpLo> SelfAdjointView<Derived, UpLo> selfadjointView();
     template<unsigned int UpLo> const SelfAdjointView<Derived, UpLo> selfadjointView() const;
 
-    const SparseView<Derived> sparseView(const Scalar m_reference = Scalar(0),
+    const SparseView<Derived> sparseView(const Scalar& m_reference = Scalar(0),
                                          typename NumTraits<Scalar>::Real m_epsilon = NumTraits<Scalar>::dummy_precision()) const;
     static const IdentityReturnType Identity();
     static const IdentityReturnType Identity(Index rows, Index cols);
diff --git a/Eigen/src/Sparse/SparseView.h b/Eigen/src/Sparse/SparseView.h
index 3ee9b0024..56d00b396 100644
--- a/Eigen/src/Sparse/SparseView.h
+++ b/Eigen/src/Sparse/SparseView.h
@@ -35,7 +35,7 @@ class SparseView : public SparseMatrixBase<SparseView<MatrixType> >
 public:
   EIGEN_SPARSE_PUBLIC_INTERFACE(SparseView)
 
-  SparseView(const MatrixType& mat, const Scalar m_reference = Scalar(0),
+  SparseView(const MatrixType& mat, const Scalar& m_reference = Scalar(0),
              typename NumTraits<Scalar>::Real m_epsilon = NumTraits<Scalar>::dummy_precision()) : 
     m_matrix(mat), m_reference(m_reference), m_epsilon(m_epsilon) {}
   class InnerIterator;
@@ -86,7 +86,7 @@ private:
 };
 
 template<typename Derived>
-const SparseView<Derived> MatrixBase<Derived>::sparseView(const Scalar m_reference,
+const SparseView<Derived> MatrixBase<Derived>::sparseView(const Scalar& m_reference,
                                                           typename NumTraits<Scalar>::Real m_epsilon) const
 {
   return SparseView<Derived>(derived(), m_reference, m_epsilon);