From 8b83e66906d9e52047137c0e45fc81076f915e13 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 27 Sep 2012 09:37:05 +0200
Subject: add scalar multiple to diagonal matrices (transplanted from
 dc5b335f9fbc25b15a408d8b1458a0140c0a8248 )

---
 Eigen/src/Core/DiagonalMatrix.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'Eigen/src/Core/DiagonalMatrix.h')

diff --git a/Eigen/src/Core/DiagonalMatrix.h b/Eigen/src/Core/DiagonalMatrix.h
index f27ab798a..da0264b0e 100644
--- a/Eigen/src/Core/DiagonalMatrix.h
+++ b/Eigen/src/Core/DiagonalMatrix.h
@@ -20,6 +20,7 @@ class DiagonalBase : public EigenBase<Derived>
   public:
     typedef typename internal::traits<Derived>::DiagonalVectorType DiagonalVectorType;
     typedef typename DiagonalVectorType::Scalar Scalar;
+    typedef typename DiagonalVectorType::RealScalar RealScalar;
     typedef typename internal::traits<Derived>::StorageKind StorageKind;
     typedef typename internal::traits<Derived>::Index Index;
 
@@ -65,6 +66,17 @@ class DiagonalBase : public EigenBase<Derived>
       return diagonal().cwiseInverse();
     }
     
+    inline const DiagonalWrapper<const CwiseUnaryOp<internal::scalar_multiple_op<Scalar>, const DiagonalVectorType> >
+    operator*(const Scalar& scalar) const
+    {
+      return diagonal() * scalar;
+    }
+    friend inline const DiagonalWrapper<const CwiseUnaryOp<internal::scalar_multiple_op<Scalar>, const DiagonalVectorType> >
+    operator*(const Scalar& scalar, const DiagonalBase& other)
+    {
+      return other.diagonal() * scalar;
+    }
+    
     #ifdef EIGEN2_SUPPORT
     template<typename OtherDerived>
     bool isApprox(const DiagonalBase<OtherDerived>& other, typename NumTraits<Scalar>::Real precision = NumTraits<Scalar>::dummy_precision()) const
-- 
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