From 9f945b6028b32ad452702f06dc0e3c3d2bad0780 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 25 Jul 2012 23:03:10 +0200
Subject: [PATCH] SparseMatrix: add missing ctor for ReturnByValue
 (transplanted from 7518201de8e4515bc60c9c68e3d1f7b974d3a24c )

---
 Eigen/src/SparseCore/SparseMatrix.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/SparseCore/SparseMatrix.h b/Eigen/src/SparseCore/SparseMatrix.h
index 9a198c913..dea84408e 100644
--- a/Eigen/src/SparseCore/SparseMatrix.h
+++ b/Eigen/src/SparseCore/SparseMatrix.h
@@ -572,6 +572,16 @@ class SparseMatrix
       *this = other.derived();
     }
 
+    /** \brief Copy constructor with in-place evaluation */
+    template<typename OtherDerived>
+    SparseMatrix(const ReturnByValue<OtherDerived>& other)
+      : Base(), m_outerSize(0), m_innerSize(0), m_outerIndex(0), m_innerNonZeros(0)
+    {
+      check_template_parameters();
+      initAssignment(other);
+      other.evalTo(*this);
+    }
+
     /** Swaps the content of two sparse matrices of the same type.
       * This is a fast operation that simply swaps the underlying pointers and parameters. */
     inline void swap(SparseMatrix& other)
@@ -613,7 +623,10 @@ class SparseMatrix
     
     template<typename OtherDerived>
     inline SparseMatrix& operator=(const ReturnByValue<OtherDerived>& other)
-    { return Base::operator=(other.derived()); }
+    {
+      initAssignment(other);
+      return Base::operator=(other.derived());
+    }
     
     template<typename OtherDerived>
     inline SparseMatrix& operator=(const EigenBase<OtherDerived>& other)