// This file is part of Eigen, a lightweight C++ template library // for linear algebra. // // Copyright (C) 2006-2008 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_SWAP_H #define EIGEN_SWAP_H namespace Eigen { /** \class SwapWrapper * \ingroup Core_Module * * \internal * * \brief Internal helper class for swapping two expressions */ namespace internal { template<typename ExpressionType> struct traits<SwapWrapper<ExpressionType> > : traits<ExpressionType> {}; } template<typename ExpressionType> class SwapWrapper : public internal::dense_xpr_base<SwapWrapper<ExpressionType> >::type { public: typedef typename internal::dense_xpr_base<SwapWrapper>::type Base; EIGEN_DENSE_PUBLIC_INTERFACE(SwapWrapper) typedef typename internal::packet_traits<Scalar>::type Packet; inline SwapWrapper(ExpressionType& xpr) : m_expression(xpr) {} inline Index rows() const { return m_expression.rows(); } inline Index cols() const { return m_expression.cols(); } inline Index outerStride() const { return m_expression.outerStride(); } inline Index innerStride() const { return m_expression.innerStride(); } typedef typename internal::conditional< internal::is_lvalue<ExpressionType>::value, Scalar, const Scalar >::type ScalarWithConstIfNotLvalue; inline ScalarWithConstIfNotLvalue* data() { return m_expression.data(); } inline const Scalar* data() const { return m_expression.data(); } inline Scalar& coeffRef(Index rowId, Index colId) { return m_expression.const_cast_derived().coeffRef(rowId, colId); } inline Scalar& coeffRef(Index index) { return m_expression.const_cast_derived().coeffRef(index); } inline Scalar& coeffRef(Index rowId, Index colId) const { return m_expression.coeffRef(rowId, colId); } inline Scalar& coeffRef(Index index) const { return m_expression.coeffRef(index); } template<typename OtherDerived> void copyCoeff(Index rowId, Index colId, const DenseBase<OtherDerived>& other) { OtherDerived& _other = other.const_cast_derived(); eigen_internal_assert(rowId >= 0 && rowId < rows() && colId >= 0 && colId < cols()); Scalar tmp = m_expression.coeff(rowId, colId); m_expression.coeffRef(rowId, colId) = _other.coeff(rowId, colId); _other.coeffRef(rowId, colId) = tmp; } template<typename OtherDerived> void copyCoeff(Index index, const DenseBase<OtherDerived>& other) { OtherDerived& _other = other.const_cast_derived(); eigen_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(Index rowId, Index colId, const DenseBase<OtherDerived>& other) { OtherDerived& _other = other.const_cast_derived(); eigen_internal_assert(rowId >= 0 && rowId < rows() && colId >= 0 && colId < cols()); Packet tmp = m_expression.template packet<StoreMode>(rowId, colId); m_expression.template writePacket<StoreMode>(rowId, colId, _other.template packet<LoadMode>(rowId, colId) ); _other.template writePacket<LoadMode>(rowId, colId, tmp); } template<typename OtherDerived, int StoreMode, int LoadMode> void copyPacket(Index index, const DenseBase<OtherDerived>& other) { OtherDerived& _other = other.const_cast_derived(); eigen_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); } ExpressionType& expression() const { return m_expression; } protected: ExpressionType& m_expression; }; } // end namespace Eigen #endif // EIGEN_SWAP_H