From bc6625ab870f7d7c26b21d0ad287edbddb8815a9 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Sun, 6 Feb 2011 11:57:04 -0500
Subject: [PATCH] fix const correctness in Diagonal::coeffRef (fix found by
 failtests)

---
 Eigen/src/Core/Diagonal.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Eigen/src/Core/Diagonal.h b/Eigen/src/Core/Diagonal.h
index 222a5be64..0fa374101 100644
--- a/Eigen/src/Core/Diagonal.h
+++ b/Eigen/src/Core/Diagonal.h
@@ -103,6 +103,7 @@ template<typename MatrixType, int DiagIndex> class Diagonal
 
     inline Scalar& coeffRef(Index row, Index)
     {
+      EIGEN_STATIC_ASSERT_LVALUE(MatrixType)
       return m_matrix.const_cast_derived().coeffRef(row+rowOffset(), row+colOffset());
     }
 
@@ -118,6 +119,7 @@ template<typename MatrixType, int DiagIndex> class Diagonal
 
     inline Scalar& coeffRef(Index index)
     {
+      EIGEN_STATIC_ASSERT_LVALUE(MatrixType)
       return m_matrix.const_cast_derived().coeffRef(index+rowOffset(), index+colOffset());
     }