[136] | 1 | // This file is part of Eigen, a lightweight C++ template library
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| 2 | // for linear algebra.
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| 3 | //
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| 4 | // Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
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| 5 | //
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| 6 | // This Source Code Form is subject to the terms of the Mozilla
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| 7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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| 8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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| 9 |
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| 10 | #ifndef EIGEN_SWAP_H
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| 11 | #define EIGEN_SWAP_H
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| 12 |
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| 13 | namespace Eigen {
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| 14 |
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| 15 | /** \class SwapWrapper
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| 16 | * \ingroup Core_Module
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| 17 | *
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| 18 | * \internal
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| 19 | *
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| 20 | * \brief Internal helper class for swapping two expressions
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| 21 | */
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| 22 | namespace internal {
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| 23 | template<typename ExpressionType>
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| 24 | struct traits<SwapWrapper<ExpressionType> > : traits<ExpressionType> {};
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| 25 | }
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| 26 |
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| 27 | template<typename ExpressionType> class SwapWrapper
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| 28 | : public internal::dense_xpr_base<SwapWrapper<ExpressionType> >::type
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| 29 | {
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| 30 | public:
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| 31 |
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| 32 | typedef typename internal::dense_xpr_base<SwapWrapper>::type Base;
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| 33 | EIGEN_DENSE_PUBLIC_INTERFACE(SwapWrapper)
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| 34 | typedef typename internal::packet_traits<Scalar>::type Packet;
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| 35 |
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| 36 | inline SwapWrapper(ExpressionType& xpr) : m_expression(xpr) {}
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| 37 |
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| 38 | inline Index rows() const { return m_expression.rows(); }
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| 39 | inline Index cols() const { return m_expression.cols(); }
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| 40 | inline Index outerStride() const { return m_expression.outerStride(); }
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| 41 | inline Index innerStride() const { return m_expression.innerStride(); }
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| 42 |
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| 43 | typedef typename internal::conditional<
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| 44 | internal::is_lvalue<ExpressionType>::value,
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| 45 | Scalar,
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| 46 | const Scalar
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| 47 | >::type ScalarWithConstIfNotLvalue;
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| 48 |
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| 49 | inline ScalarWithConstIfNotLvalue* data() { return m_expression.data(); }
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| 50 | inline const Scalar* data() const { return m_expression.data(); }
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| 51 |
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| 52 | inline Scalar& coeffRef(Index rowId, Index colId)
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| 53 | {
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| 54 | return m_expression.const_cast_derived().coeffRef(rowId, colId);
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| 55 | }
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| 56 |
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| 57 | inline Scalar& coeffRef(Index index)
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| 58 | {
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| 59 | return m_expression.const_cast_derived().coeffRef(index);
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| 60 | }
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| 61 |
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| 62 | inline Scalar& coeffRef(Index rowId, Index colId) const
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| 63 | {
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| 64 | return m_expression.coeffRef(rowId, colId);
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| 65 | }
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| 66 |
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| 67 | inline Scalar& coeffRef(Index index) const
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| 68 | {
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| 69 | return m_expression.coeffRef(index);
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| 70 | }
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| 71 |
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| 72 | template<typename OtherDerived>
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| 73 | void copyCoeff(Index rowId, Index colId, const DenseBase<OtherDerived>& other)
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| 74 | {
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| 75 | OtherDerived& _other = other.const_cast_derived();
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| 76 | eigen_internal_assert(rowId >= 0 && rowId < rows()
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| 77 | && colId >= 0 && colId < cols());
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| 78 | Scalar tmp = m_expression.coeff(rowId, colId);
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| 79 | m_expression.coeffRef(rowId, colId) = _other.coeff(rowId, colId);
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| 80 | _other.coeffRef(rowId, colId) = tmp;
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| 81 | }
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| 82 |
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| 83 | template<typename OtherDerived>
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| 84 | void copyCoeff(Index index, const DenseBase<OtherDerived>& other)
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| 85 | {
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| 86 | OtherDerived& _other = other.const_cast_derived();
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| 87 | eigen_internal_assert(index >= 0 && index < m_expression.size());
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| 88 | Scalar tmp = m_expression.coeff(index);
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| 89 | m_expression.coeffRef(index) = _other.coeff(index);
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| 90 | _other.coeffRef(index) = tmp;
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| 91 | }
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| 92 |
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| 93 | template<typename OtherDerived, int StoreMode, int LoadMode>
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| 94 | void copyPacket(Index rowId, Index colId, const DenseBase<OtherDerived>& other)
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| 95 | {
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| 96 | OtherDerived& _other = other.const_cast_derived();
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| 97 | eigen_internal_assert(rowId >= 0 && rowId < rows()
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| 98 | && colId >= 0 && colId < cols());
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| 99 | Packet tmp = m_expression.template packet<StoreMode>(rowId, colId);
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| 100 | m_expression.template writePacket<StoreMode>(rowId, colId,
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| 101 | _other.template packet<LoadMode>(rowId, colId)
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| 102 | );
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| 103 | _other.template writePacket<LoadMode>(rowId, colId, tmp);
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| 104 | }
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| 105 |
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| 106 | template<typename OtherDerived, int StoreMode, int LoadMode>
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| 107 | void copyPacket(Index index, const DenseBase<OtherDerived>& other)
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| 108 | {
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| 109 | OtherDerived& _other = other.const_cast_derived();
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| 110 | eigen_internal_assert(index >= 0 && index < m_expression.size());
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| 111 | Packet tmp = m_expression.template packet<StoreMode>(index);
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| 112 | m_expression.template writePacket<StoreMode>(index,
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| 113 | _other.template packet<LoadMode>(index)
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| 114 | );
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| 115 | _other.template writePacket<LoadMode>(index, tmp);
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| 116 | }
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| 117 |
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| 118 | ExpressionType& expression() const { return m_expression; }
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| 119 |
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| 120 | protected:
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| 121 | ExpressionType& m_expression;
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| 122 | };
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| 123 |
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| 124 | } // end namespace Eigen
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| 125 |
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| 126 | #endif // EIGEN_SWAP_H
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