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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