1 files changed, 8 insertions, 4 deletions

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorScan.h b/unsupported/Eigen/CXX11/src/Tensor/TensorScan.h
index 031dbf6f2..5207f6a8d 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorScan.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorScan.h
@@ -81,7 +81,7 @@ struct TensorEvaluator<const TensorScanOp<Op, ArgType>, Device> {
   typedef typename XprType::Index Index;
   static const int NumDims = internal::array_size<typename TensorEvaluator<ArgType, Device>::Dimensions>::value;
   typedef DSizes<Index, NumDims> Dimensions;
-  typedef typename XprType::Scalar Scalar;
+  typedef typename internal::remove_const<typename XprType::Scalar>::type Scalar;
   typedef typename XprType::CoeffReturnType CoeffReturnType;
   typedef typename PacketType<CoeffReturnType, Device>::type PacketReturnType;
 
@@ -106,7 +106,7 @@ struct TensorEvaluator<const TensorScanOp<Op, ArgType>, Device> {
         m_output(NULL) {
 
     // Accumulating a scalar isn't supported.
-    EIGEN_STATIC_ASSERT(NumDims > 0, YOU_MADE_A_PROGRAMMING_MISTAKE);
+    EIGEN_STATIC_ASSERT((NumDims > 0), YOU_MADE_A_PROGRAMMING_MISTAKE);
     eigen_assert(m_axis >= 0 && m_axis < NumDims);
 
     // Compute stride of scan axis
@@ -122,7 +122,7 @@ struct TensorEvaluator<const TensorScanOp<Op, ArgType>, Device> {
   }
 
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const Dimensions& dimensions() const {
-      return m_dimensions;
+    return m_dimensions;
   }
 
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE bool evalSubExprsIfNeeded(Scalar* data) {
@@ -136,7 +136,7 @@ struct TensorEvaluator<const TensorScanOp<Op, ArgType>, Device> {
       return true;
     }
   }
-  
+
   template<int LoadMode>
   EIGEN_DEVICE_FUNC PacketReturnType packet(Index index) const {
     return internal::ploadt<PacketReturnType, LoadMode>(m_output + index);
@@ -152,6 +152,10 @@ struct TensorEvaluator<const TensorScanOp<Op, ArgType>, Device> {
     return m_output[index];
   }
 
+  EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorOpCost costPerCoeff(bool) const {
+    return TensorOpCost(sizeof(CoeffReturnType), 0, 0);
+  }
+
   EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void cleanup() {
     if (m_output != NULL) {
       m_device.deallocate(m_output);