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diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorForcedEval.h b/unsupported/Eigen/CXX11/src/Tensor/TensorForcedEval.h
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+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef EIGEN_CXX11_TENSOR_TENSOR_FORCED_EVAL_H
+#define EIGEN_CXX11_TENSOR_TENSOR_FORCED_EVAL_H
+
+namespace Eigen {
+
+/** \class TensorForcedEval
+ * \ingroup CXX11_Tensor_Module
+ *
+ * \brief Tensor reshaping class.
+ *
+ *
+ */
+namespace internal {
+template<typename XprType>
+struct traits<TensorForcedEvalOp<XprType> >
+{
+ // Type promotion to handle the case where the types of the lhs and the rhs are different.
+ typedef typename XprType::Scalar Scalar;
+ typedef traits<XprType> XprTraits;
+ typedef typename packet_traits<Scalar>::type Packet;
+ typedef typename traits<XprType>::StorageKind StorageKind;
+ typedef typename traits<XprType>::Index Index;
+ typedef typename XprType::Nested Nested;
+ typedef typename remove_reference<Nested>::type _Nested;
+ static const int NumDimensions = XprTraits::NumDimensions;
+ static const int Layout = XprTraits::Layout;
+
+ enum {
+ Flags = 0,
+ };
+};
+
+template<typename XprType>
+struct eval<TensorForcedEvalOp<XprType>, Eigen::Dense>
+{
+ typedef const TensorForcedEvalOp<XprType>& type;
+};
+
+template<typename XprType>
+struct nested<TensorForcedEvalOp<XprType>, 1, typename eval<TensorForcedEvalOp<XprType> >::type>
+{
+ typedef TensorForcedEvalOp<XprType> type;
+};
+
+} // end namespace internal
+
+
+
+template<typename XprType>
+class TensorForcedEvalOp : public TensorBase<TensorForcedEvalOp<XprType> >
+{
+ public:
+ typedef typename Eigen::internal::traits<TensorForcedEvalOp>::Scalar Scalar;
+ typedef typename Eigen::internal::traits<TensorForcedEvalOp>::Packet Packet;
+ typedef typename Eigen::NumTraits<Scalar>::Real RealScalar;
+ typedef typename internal::remove_const<typename XprType::CoeffReturnType>::type CoeffReturnType;
+ typedef typename internal::remove_const<typename XprType::PacketReturnType>::type PacketReturnType;
+ typedef typename Eigen::internal::nested<TensorForcedEvalOp>::type Nested;
+ typedef typename Eigen::internal::traits<TensorForcedEvalOp>::StorageKind StorageKind;
+ typedef typename Eigen::internal::traits<TensorForcedEvalOp>::Index Index;
+
+ EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE TensorForcedEvalOp(const XprType& expr)
+ : m_xpr(expr) {}
+
+ EIGEN_DEVICE_FUNC
+ const typename internal::remove_all<typename XprType::Nested>::type&
+ expression() const { return m_xpr; }
+
+ protected:
+ typename XprType::Nested m_xpr;
+};
+
+
+template<typename ArgType, typename Device>
+struct TensorEvaluator<const TensorForcedEvalOp<ArgType>, Device>
+{
+ typedef TensorForcedEvalOp<ArgType> XprType;
+ typedef typename ArgType::Scalar Scalar;
+ typedef typename ArgType::Packet Packet;
+ typedef typename TensorEvaluator<ArgType, Device>::Dimensions Dimensions;
+
+ enum {
+ IsAligned = true,
+ PacketAccess = (internal::packet_traits<Scalar>::size > 1),
+ Layout = TensorEvaluator<ArgType, Device>::Layout,
+ };
+
+ EIGEN_DEVICE_FUNC TensorEvaluator(const XprType& op, const Device& device)
+ : m_impl(op.expression(), device), m_op(op.expression()), m_device(device), m_buffer(NULL)
+ { }
+
+ typedef typename XprType::Index Index;
+ typedef typename XprType::CoeffReturnType CoeffReturnType;
+ typedef typename XprType::PacketReturnType PacketReturnType;
+
+ EIGEN_DEVICE_FUNC const Dimensions& dimensions() const { return m_impl.dimensions(); }
+
+ EIGEN_STRONG_INLINE bool evalSubExprsIfNeeded(CoeffReturnType*) {
+ m_impl.evalSubExprsIfNeeded(NULL);
+ const Index numValues = m_impl.dimensions().TotalSize();
+ m_buffer = (CoeffReturnType*)m_device.allocate(numValues * sizeof(CoeffReturnType));
+ // Should initialize the memory in case we're dealing with non POD types.
+ if (!internal::is_arithmetic<CoeffReturnType>::value) {
+ for (Index i = 0; i < numValues; ++i) {
+ new(m_buffer+i) CoeffReturnType();
+ }
+ }
+ typedef TensorEvalToOp<const ArgType> EvalTo;
+ EvalTo evalToTmp(m_buffer, m_op);
+ internal::TensorExecutor<const EvalTo, Device, TensorEvaluator<ArgType, Device>::PacketAccess>::run(evalToTmp, m_device);
+ m_impl.cleanup();
+ return true;
+ }
+ EIGEN_STRONG_INLINE void cleanup() {
+ m_device.deallocate(m_buffer);
+ m_buffer = NULL;
+ }
+
+ EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE CoeffReturnType coeff(Index index) const
+ {
+ return m_buffer[index];
+ }
+
+ template<int LoadMode>
+ EIGEN_STRONG_INLINE PacketReturnType packet(Index index) const
+ {
+ return internal::ploadt<Packet, LoadMode>(m_buffer + index);
+ }
+
+ EIGEN_DEVICE_FUNC Scalar* data() const { return m_buffer; }
+
+ private:
+ TensorEvaluator<ArgType, Device> m_impl;
+ const ArgType m_op;
+ const Device& m_device;
+ CoeffReturnType* m_buffer;
+};
+
+
+} // end namespace Eigen
+
+#endif // EIGEN_CXX11_TENSOR_TENSOR_FORCED_EVAL_H