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Diffstat (limited to 'extern/Eigen2/Eigen/src/Core/Swap.h')
| -rw-r--r-- | extern/Eigen2/Eigen/src/Core/Swap.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/extern/Eigen2/Eigen/src/Core/Swap.h b/extern/Eigen2/Eigen/src/Core/Swap.h new file mode 100644 index 00000000000..77d562cd3ac --- /dev/null +++ b/extern/Eigen2/Eigen/src/Core/Swap.h @@ -0,0 +1,142 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. Eigen itself is part of the KDE project. +// +// Copyright (C) 2006-2008 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_SWAP_H +#define EIGEN_SWAP_H + +/** \class SwapWrapper + * + * \internal + * + * \brief Internal helper class for swapping two expressions + */ +template<typename ExpressionType> +struct ei_traits<SwapWrapper<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 SwapWrapper + : public MatrixBase<SwapWrapper<ExpressionType> > +{ + public: + + EIGEN_GENERIC_PUBLIC_INTERFACE(SwapWrapper) + typedef typename ei_packet_traits<Scalar>::type Packet; + + inline SwapWrapper(ExpressionType& xpr) : m_expression(xpr) {} + + 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 Scalar& coeffRef(int row, int col) + { + return m_expression.const_cast_derived().coeffRef(row, col); + } + + inline Scalar& coeffRef(int index) + { + return m_expression.const_cast_derived().coeffRef(index); + } + + template<typename OtherDerived> + void copyCoeff(int row, int col, const MatrixBase<OtherDerived>& other) + { + OtherDerived& _other = other.const_cast_derived(); + ei_internal_assert(row >= 0 && row < rows() + && col >= 0 && col < cols()); + Scalar tmp = m_expression.coeff(row, col); + m_expression.coeffRef(row, col) = _other.coeff(row, col); + _other.coeffRef(row, col) = tmp; + } + + template<typename OtherDerived> + void copyCoeff(int index, const MatrixBase<OtherDerived>& other) + { + OtherDerived& _other = other.const_cast_derived(); + ei_internal_assert(index >= 0 && index < m_expression.size()); + Scalar tmp = m_expression.coeff(index); + m_expression.coeffRef(index) = _other.coeff(index); + _other.coeffRef(index) = tmp; + } + + template<typename OtherDerived, int StoreMode, int LoadMode> + void copyPacket(int row, int col, const MatrixBase<OtherDerived>& other) + { + OtherDerived& _other = other.const_cast_derived(); + ei_internal_assert(row >= 0 && row < rows() + && col >= 0 && col < cols()); + Packet tmp = m_expression.template packet<StoreMode>(row, col); + m_expression.template writePacket<StoreMode>(row, col, + _other.template packet<LoadMode>(row, col) + ); + _other.template writePacket<LoadMode>(row, col, tmp); + } + + template<typename OtherDerived, int StoreMode, int LoadMode> + void copyPacket(int index, const MatrixBase<OtherDerived>& other) + { + OtherDerived& _other = other.const_cast_derived(); + ei_internal_assert(index >= 0 && index < m_expression.size()); + Packet tmp = m_expression.template packet<StoreMode>(index); + m_expression.template writePacket<StoreMode>(index, + _other.template packet<LoadMode>(index) + ); + _other.template writePacket<LoadMode>(index, tmp); + } + + protected: + ExpressionType& m_expression; +}; + +/** swaps *this with the expression \a other. + * + * \note \a other is only marked for internal reasons, but of course + * it gets const-casted. One reason is that one will often call swap + * on temporary objects (hence non-const references are forbidden). + * Another reason is that lazyAssign takes a const argument anyway. + */ +template<typename Derived> +template<typename OtherDerived> +void MatrixBase<Derived>::swap(const MatrixBase<OtherDerived>& other) +{ + (SwapWrapper<Derived>(derived())).lazyAssign(other); +} + +#endif // EIGEN_SWAP_H + + + + + + |