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Diffstat (limited to 'extern/Eigen3/Eigen/src/Core/ReturnByValue.h')
-rw-r--r-- | extern/Eigen3/Eigen/src/Core/ReturnByValue.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/extern/Eigen3/Eigen/src/Core/ReturnByValue.h b/extern/Eigen3/Eigen/src/Core/ReturnByValue.h new file mode 100644 index 00000000000..24c5a4e215d --- /dev/null +++ b/extern/Eigen3/Eigen/src/Core/ReturnByValue.h @@ -0,0 +1,99 @@ +// 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> +// +// Eigen is free software; you can redistribute it and/or +// modify it under the terms of the GNU Lesser General Public +// License as published by the Free Software Foundation; either +// version 3 of the License, or (at your option) any later version. +// +// Alternatively, you can redistribute it and/or +// modify it under the terms of the GNU General Public License as +// published by the Free Software Foundation; either version 2 of +// the License, or (at your option) any later version. +// +// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY +// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS +// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License and a copy of the GNU General Public License along with +// Eigen. If not, see <http://www.gnu.org/licenses/>. + +#ifndef EIGEN_RETURNBYVALUE_H +#define EIGEN_RETURNBYVALUE_H + +/** \class ReturnByValue + * \ingroup Core_Module + * + */ + +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 ?? + */ +template<typename Derived,int n,typename PlainObject> +struct nested<ReturnByValue<Derived>, n, PlainObject> +{ + typedef typename traits<Derived>::ReturnType type; +}; + +} // end namespace internal + +template<typename Derived> class ReturnByValue + : public internal::dense_xpr_base< ReturnByValue<Derived> >::type +{ + 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> + inline void evalTo(Dest& dst) const + { static_cast<const Derived*>(this)->evalTo(dst); } + inline Index rows() const { return static_cast<const Derived*>(this)->rows(); } + 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); } +#endif +}; + +template<typename Derived> +template<typename OtherDerived> +Derived& DenseBase<Derived>::operator=(const ReturnByValue<OtherDerived>& other) +{ + other.evalTo(derived()); + return derived(); +} + +#endif // EIGEN_RETURNBYVALUE_H |