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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_EVALUATOR_H
#define EIGEN_CXX11_TENSOR_TENSOR_EVALUATOR_H
namespace Eigen {
/** \class TensorEvaluator
* \ingroup CXX11_Tensor_Module
*
* \brief The tensor evaluator classes.
*
* These classes are responsible for the evaluation of the tensor expression.
*
* TODO: add support for more types of expressions, in particular expressions
* leading to lvalues (slicing, reshaping, etc...)
* TODO: add support for vectorization
*/
template<typename Derived>
struct TensorEvaluator
{
typedef typename Derived::Index Index;
typedef typename Derived::Scalar Scalar;
typedef typename Derived::Scalar& CoeffReturnType;
TensorEvaluator(Derived& m)
: m_data(const_cast<Scalar*>(m.data()))
{ }
CoeffReturnType coeff(Index index) const {
return m_data[index];
}
Scalar& coeffRef(Index index) {
return m_data[index];
}
// to do: vectorized evaluation.
/* template<int LoadMode>
PacketReturnType packet(Index index) const
{
return ploadt<PacketScalar, LoadMode>(m_data + index);
}
template<int StoreMode>
void writePacket(Index index, const PacketScalar& x)
{
return pstoret<Scalar, PacketScalar, StoreMode>(const_cast<Scalar*>(m_data) + index, x);
}*/
protected:
Scalar* m_data;
};
// -------------------- CwiseUnaryOp --------------------
template<typename UnaryOp, typename ArgType>
struct TensorEvaluator<const TensorCwiseUnaryOp<UnaryOp, ArgType> >
{
typedef TensorCwiseUnaryOp<UnaryOp, ArgType> XprType;
TensorEvaluator(const XprType& op)
: m_functor(op.functor()),
m_argImpl(op.nestedExpression())
{ }
typedef typename XprType::Index Index;
typedef typename XprType::CoeffReturnType CoeffReturnType;
CoeffReturnType coeff(Index index) const
{
return m_functor(m_argImpl.coeff(index));
}
private:
const UnaryOp m_functor;
TensorEvaluator<ArgType> m_argImpl;
};
// -------------------- CwiseBinaryOp --------------------
template<typename BinaryOp, typename LeftArgType, typename RightArgType>
struct TensorEvaluator<const TensorCwiseBinaryOp<BinaryOp, LeftArgType, RightArgType> >
{
typedef TensorCwiseBinaryOp<BinaryOp, LeftArgType, RightArgType> XprType;
TensorEvaluator(const XprType& op)
: m_functor(op.functor()),
m_leftImpl(op.lhsExpression()),
m_rightImpl(op.rhsExpression())
{ }
typedef typename XprType::Index Index;
typedef typename XprType::CoeffReturnType CoeffReturnType;
CoeffReturnType coeff(Index index) const
{
return m_functor(m_leftImpl.coeff(index), m_rightImpl.coeff(index));
}
private:
const BinaryOp m_functor;
TensorEvaluator<LeftArgType> m_leftImpl;
TensorEvaluator<RightArgType> m_rightImpl;
};
} // end namespace Eigen
#endif // EIGEN_CXX11_TENSOR_TENSOR_EVALUATOR_H
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