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-rw-r--r--Eigen/src/Core/Difference.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/Eigen/src/Core/Difference.h b/Eigen/src/Core/Difference.h
index 99cf5674f..645de9151 100644
--- a/Eigen/src/Core/Difference.h
+++ b/Eigen/src/Core/Difference.h
@@ -47,7 +47,8 @@ template<typename Lhs, typename Rhs> class Difference : NoOperatorEquals,
typedef typename Lhs::Ref LhsRef;
typedef typename Rhs::Ref RhsRef;
friend class MatrixBase<Scalar, Difference>;
-
+ typedef MatrixBase<Scalar, Difference> Base;
+
Difference(const LhsRef& lhs, const RhsRef& rhs)
: m_lhs(lhs), m_rhs(rhs)
{