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Diffstat (limited to 'Eigen/src/Core/NestByValue.h')
-rw-r--r-- | Eigen/src/Core/NestByValue.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/Eigen/src/Core/NestByValue.h b/Eigen/src/Core/NestByValue.h new file mode 100644 index 000000000..dc2ea950e --- /dev/null +++ b/Eigen/src/Core/NestByValue.h @@ -0,0 +1,93 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. Eigen itself is part of the KDE project. +// +// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr> +// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr> +// +// 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_NESTBYVALUE_H +#define EIGEN_NESTBYVALUE_H + +/** \class NestByValue + * + * \brief Expression which must be nested by value + * + * \param ExpressionType the type of the object of which we are requiring nesting-by-value + * + * This class is the return type of MatrixBase::nestByValue() + * and most of the time this is the only way it is used. + * + * \sa MatrixBase::nestByValue() + */ +template<typename ExpressionType> +struct ei_traits<NestByValue<ExpressionType> > +{ + typedef typename ExpressionType::Scalar Scalar; + enum { + RowsAtCompileTime = ExpressionType::RowsAtCompileTime, + ColsAtCompileTime = ExpressionType::ColsAtCompileTime, + MaxRowsAtCompileTime = ExpressionType::MaxRowsAtCompileTime, + MaxColsAtCompileTime = ExpressionType::MaxColsAtCompileTime, + Flags = ExpressionType::Flags, + CoeffReadCost = ExpressionType::CoeffReadCost + }; +}; + +template<typename ExpressionType> class NestByValue + : public MatrixBase<NestByValue<ExpressionType> > +{ + public: + + EIGEN_GENERIC_PUBLIC_INTERFACE(NestByValue) + + inline NestByValue(const ExpressionType& matrix) : m_expression(matrix) {} + + private: + + inline int _rows() const { return m_expression.rows(); } + inline int _cols() const { return m_expression.cols(); } + inline int _stride() const { return m_expression.stride(); } + + inline const Scalar _coeff(int row, int col) const + { + return m_expression.coeff(row, col); + } + + template<int LoadMode> + inline const PacketScalar _packetCoeff(int row, int col) const + { + return m_expression.template packetCoeff<LoadMode>(row, col); + } + + protected: + const ExpressionType m_expression; +}; + +/** \returns an expression of the temporary version of *this. + */ +template<typename Derived> +inline const NestByValue<Derived> +MatrixBase<Derived>::nestByValue() const +{ + return NestByValue<Derived>(derived()); +} + +#endif // EIGEN_NESTBYVALUE_H |