From 2b17f345742f582daa2ce075d58c0d6a612bf021 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Tue, 16 Aug 2016 16:00:30 -0700
Subject: [PATCH] Properly detect the type of the result of a contraction.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h b/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
index 56d9c2025..a6001074b 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorContraction.h
@@ -25,8 +25,8 @@ template<typename Dimensions, typename LhsXprType, typename RhsXprType>
 struct traits<TensorContractionOp<Dimensions, LhsXprType, RhsXprType> >
 {
   // Type promotion to handle the case where the types of the lhs and the rhs are different.
-  typedef typename internal::promote_storage_type<typename LhsXprType::Scalar,
-                                                  typename RhsXprType::Scalar>::ret Scalar;
+  typedef typename gebp_traits<typename LhsXprType::Scalar, typename RhsXprType::Scalar>::ResScalar Scalar;
+
   typedef typename promote_storage_type<typename traits<LhsXprType>::StorageKind,
                                         typename traits<RhsXprType>::StorageKind>::ret StorageKind;
   typedef typename promote_index_type<typename traits<LhsXprType>::Index,
@@ -75,8 +75,8 @@ class TensorContractionOp : public TensorBase<TensorContractionOp<Indices, LhsXp
 {
   public:
   typedef typename Eigen::internal::traits<TensorContractionOp>::Scalar Scalar;
-  typedef typename internal::promote_storage_type<typename LhsXprType::CoeffReturnType,
-                                                  typename RhsXprType::CoeffReturnType>::ret CoeffReturnType;
+  typedef typename internal::gebp_traits<typename LhsXprType::CoeffReturnType,
+                                                   typename RhsXprType::CoeffReturnType>::ResScalar CoeffReturnType;
   typedef typename Eigen::internal::nested<TensorContractionOp>::type Nested;
   typedef typename Eigen::internal::traits<TensorContractionOp>::StorageKind StorageKind;
   typedef typename Eigen::internal::traits<TensorContractionOp>::Index Index;