chromium/third_party/eigen3/src/unsupported/Eigen/CXX11/src/Tensor/TensorRef.h

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <[email protected]>
//
// 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_REF_H
#define EIGEN_CXX11_TENSOR_TENSOR_REF_H

// IWYU pragma: private
#include "./InternalHeaderCheck.h"

namespace Eigen {

namespace internal {

template <typename Dimensions, typename Scalar>
class TensorLazyBaseEvaluator { … };

template <typename Dimensions, typename Expr, typename Device>
class TensorLazyEvaluatorReadOnly
    : public TensorLazyBaseEvaluator<Dimensions, typename TensorEvaluator<Expr, Device>::Scalar> { … };

template <typename Dimensions, typename Expr, typename Device>
class TensorLazyEvaluatorWritable : public TensorLazyEvaluatorReadOnly<Dimensions, Expr, Device> { … };

template <typename Dimensions, typename Expr, typename Device>
class TensorLazyEvaluator : public std::conditional_t<bool(internal::is_lvalue<Expr>::value),
                                                      TensorLazyEvaluatorWritable<Dimensions, Expr, Device>,
                                                      TensorLazyEvaluatorReadOnly<Dimensions, const Expr, Device> > { … };

}  // namespace internal

/** \class TensorRef
 * \ingroup CXX11_Tensor_Module
 *
 * \brief A reference to a tensor expression
 * The expression will be evaluated lazily (as much as possible).
 *
 */
template <typename PlainObjectType>
class TensorRef : public TensorBase<TensorRef<PlainObjectType> > { … };

// evaluator for rvalues
TensorEvaluator<const TensorRef<Derived>, Device>;

// evaluator for lvalues
TensorEvaluator<TensorRef<Derived>, Device>;

}  // end namespace Eigen

#endif  // EIGEN_CXX11_TENSOR_TENSOR_REF_H