From 6fa6cdd2b988da98cbdd2b1a5fd2fd3b9d56a4b1 Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Wed, 4 Jun 2014 09:21:48 -0700
Subject: Added support for tensor contractions Updated expression evaluation
 mechanism to also compute the size of the tensor result Misc fixes and
 improvements.

---
 unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h | 36 ++++++++++++++-----------
 1 file changed, 20 insertions(+), 16 deletions(-)

(limited to 'unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h')

diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h b/unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
index 94cfae05c..60908ee94 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorExpr.h
@@ -28,13 +28,13 @@ namespace Eigen {
   *
   */
 namespace internal {
-template<typename NullaryOp, typename PlainObjectType>
-struct traits<TensorCwiseNullaryOp<NullaryOp, PlainObjectType> >
-    : traits<PlainObjectType>
+template<typename NullaryOp, typename XprType>
+struct traits<TensorCwiseNullaryOp<NullaryOp, XprType> >
+    : traits<XprType>
 {
-  typedef typename PlainObjectType::Packet Packet;
-  typedef typename PlainObjectType::Scalar Scalar;
-  typedef typename PlainObjectType::Nested XprTypeNested;
+  typedef typename XprType::Packet Packet;
+  typedef typename XprType::Scalar Scalar;
+  typedef typename XprType::Nested XprTypeNested;
   typedef typename remove_reference<XprTypeNested>::type _XprTypeNested;
 };
 
@@ -42,27 +42,31 @@ struct traits<TensorCwiseNullaryOp<NullaryOp, PlainObjectType> >
 
 
 
-template<typename NullaryOp, typename PlainObjectType>
-class TensorCwiseNullaryOp : public TensorBase<TensorCwiseNullaryOp<NullaryOp, PlainObjectType> >
+template<typename NullaryOp, typename XprType>
+class TensorCwiseNullaryOp : public TensorBase<TensorCwiseNullaryOp<NullaryOp, XprType> >
 {
   public:
     typedef typename Eigen::internal::traits<TensorCwiseNullaryOp>::Scalar Scalar;
     typedef typename Eigen::internal::traits<TensorCwiseNullaryOp>::Packet Packet;
     typedef typename Eigen::NumTraits<Scalar>::Real RealScalar;
-    typedef typename PlainObjectType::CoeffReturnType CoeffReturnType;
-    typedef typename PlainObjectType::PacketReturnType PacketReturnType;
-    typedef TensorCwiseNullaryOp<NullaryOp, PlainObjectType> Nested;
+    typedef typename XprType::CoeffReturnType CoeffReturnType;
+    typedef typename XprType::PacketReturnType PacketReturnType;
+    typedef TensorCwiseNullaryOp<NullaryOp, XprType> Nested;
     typedef typename Eigen::internal::traits<TensorCwiseNullaryOp>::StorageKind StorageKind;
     typedef typename Eigen::internal::traits<TensorCwiseNullaryOp>::Index Index;
 
-    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorCwiseNullaryOp(const NullaryOp& func = NullaryOp())
-      : m_functor(func) {}
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorCwiseNullaryOp(const XprType& xpr, const NullaryOp& func = NullaryOp())
+        : m_xpr(xpr), m_functor(func) {}
+
+    EIGEN_DEVICE_FUNC
+    const typename internal::remove_all<typename XprType::Nested>::type&
+    nestedExpression() const { return m_xpr; }
 
     EIGEN_DEVICE_FUNC
     const NullaryOp& functor() const { return m_functor; }
 
   protected:
-    // todo: add tensor dimension to be able to do some sanity checks
+    typename XprType::Nested m_xpr;
     const NullaryOp m_functor;
 };
 
@@ -71,7 +75,7 @@ class TensorCwiseNullaryOp : public TensorBase<TensorCwiseNullaryOp<NullaryOp, P
 namespace internal {
 template<typename UnaryOp, typename XprType>
 struct traits<TensorCwiseUnaryOp<UnaryOp, XprType> >
- : traits<XprType>
+    : traits<XprType>
 {
   typedef typename result_of<
                      UnaryOp(typename XprType::Scalar)
@@ -207,7 +211,7 @@ class TensorCwiseBinaryOp : public TensorBase<TensorCwiseBinaryOp<BinaryOp, LhsX
 namespace internal {
 template<typename IfXprType, typename ThenXprType, typename ElseXprType>
 struct traits<TensorSelectOp<IfXprType, ThenXprType, ElseXprType> >
- : traits<ThenXprType>
+    : traits<ThenXprType>
 {
   typedef typename traits<ThenXprType>::Scalar Scalar;
   typedef typename internal::packet_traits<Scalar>::type Packet;
-- 
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