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Diffstat (limited to 'runtimes/nn/depend/external/eigen/Eigen/src/Core/ReturnByValue.h')
-rw-r--r-- | runtimes/nn/depend/external/eigen/Eigen/src/Core/ReturnByValue.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/runtimes/nn/depend/external/eigen/Eigen/src/Core/ReturnByValue.h b/runtimes/nn/depend/external/eigen/Eigen/src/Core/ReturnByValue.h new file mode 100644 index 000000000..c44b7673b --- /dev/null +++ b/runtimes/nn/depend/external/eigen/Eigen/src/Core/ReturnByValue.h @@ -0,0 +1,117 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr> +// Copyright (C) 2009-2010 Benoit Jacob <jacob.benoit.1@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_RETURNBYVALUE_H +#define EIGEN_RETURNBYVALUE_H + +namespace Eigen { + +namespace internal { + +template<typename Derived> +struct traits<ReturnByValue<Derived> > + : public traits<typename traits<Derived>::ReturnType> +{ + enum { + // We're disabling the DirectAccess because e.g. the constructor of + // the Block-with-DirectAccess expression requires to have a coeffRef method. + // Also, we don't want to have to implement the stride stuff. + Flags = (traits<typename traits<Derived>::ReturnType>::Flags + | EvalBeforeNestingBit) & ~DirectAccessBit + }; +}; + +/* The ReturnByValue object doesn't even have a coeff() method. + * So the only way that nesting it in an expression can work, is by evaluating it into a plain matrix. + * So internal::nested always gives the plain return matrix type. + * + * FIXME: I don't understand why we need this specialization: isn't this taken care of by the EvalBeforeNestingBit ?? + * Answer: EvalBeforeNestingBit should be deprecated since we have the evaluators + */ +template<typename Derived,int n,typename PlainObject> +struct nested_eval<ReturnByValue<Derived>, n, PlainObject> +{ + typedef typename traits<Derived>::ReturnType type; +}; + +} // end namespace internal + +/** \class ReturnByValue + * \ingroup Core_Module + * + */ +template<typename Derived> class ReturnByValue + : public internal::dense_xpr_base< ReturnByValue<Derived> >::type, internal::no_assignment_operator +{ + public: + typedef typename internal::traits<Derived>::ReturnType ReturnType; + + typedef typename internal::dense_xpr_base<ReturnByValue>::type Base; + EIGEN_DENSE_PUBLIC_INTERFACE(ReturnByValue) + + template<typename Dest> + EIGEN_DEVICE_FUNC + inline void evalTo(Dest& dst) const + { static_cast<const Derived*>(this)->evalTo(dst); } + EIGEN_DEVICE_FUNC inline Index rows() const { return static_cast<const Derived*>(this)->rows(); } + EIGEN_DEVICE_FUNC inline Index cols() const { return static_cast<const Derived*>(this)->cols(); } + +#ifndef EIGEN_PARSED_BY_DOXYGEN +#define Unusable YOU_ARE_TRYING_TO_ACCESS_A_SINGLE_COEFFICIENT_IN_A_SPECIAL_EXPRESSION_WHERE_THAT_IS_NOT_ALLOWED_BECAUSE_THAT_WOULD_BE_INEFFICIENT + class Unusable{ + Unusable(const Unusable&) {} + Unusable& operator=(const Unusable&) {return *this;} + }; + const Unusable& coeff(Index) const { return *reinterpret_cast<const Unusable*>(this); } + const Unusable& coeff(Index,Index) const { return *reinterpret_cast<const Unusable*>(this); } + Unusable& coeffRef(Index) { return *reinterpret_cast<Unusable*>(this); } + Unusable& coeffRef(Index,Index) { return *reinterpret_cast<Unusable*>(this); } +#undef Unusable +#endif +}; + +template<typename Derived> +template<typename OtherDerived> +Derived& DenseBase<Derived>::operator=(const ReturnByValue<OtherDerived>& other) +{ + other.evalTo(derived()); + return derived(); +} + +namespace internal { + +// Expression is evaluated in a temporary; default implementation of Assignment is bypassed so that +// when a ReturnByValue expression is assigned, the evaluator is not constructed. +// TODO: Finalize port to new regime; ReturnByValue should not exist in the expression world + +template<typename Derived> +struct evaluator<ReturnByValue<Derived> > + : public evaluator<typename internal::traits<Derived>::ReturnType> +{ + typedef ReturnByValue<Derived> XprType; + typedef typename internal::traits<Derived>::ReturnType PlainObject; + typedef evaluator<PlainObject> Base; + + EIGEN_DEVICE_FUNC explicit evaluator(const XprType& xpr) + : m_result(xpr.rows(), xpr.cols()) + { + ::new (static_cast<Base*>(this)) Base(m_result); + xpr.evalTo(m_result); + } + +protected: + PlainObject m_result; +}; + +} // end namespace internal + +} // end namespace Eigen + +#endif // EIGEN_RETURNBYVALUE_H |