1 // This file is part of Eigen, a lightweight C++ template library 2 // for linear algebra. 3 // 4 // Copyright (C) 2009-2010 Gael Guennebaud <[email protected]> 5 // 6 // This Source Code Form is subject to the terms of the Mozilla 7 // Public License v. 2.0. If a copy of the MPL was not distributed 8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 9 10 #ifndef EIGEN_CWISE_UNARY_VIEW_H 11 #define EIGEN_CWISE_UNARY_VIEW_H 12 13 namespace Eigen { 14 15 namespace internal { 16 template<typename ViewOp, typename MatrixType> 17 struct traits<CwiseUnaryView<ViewOp, MatrixType> > 18 : traits<MatrixType> 19 { 20 typedef typename result_of< 21 ViewOp(const typename traits<MatrixType>::Scalar&) 22 >::type Scalar; 23 typedef typename MatrixType::Nested MatrixTypeNested; 24 typedef typename remove_all<MatrixTypeNested>::type _MatrixTypeNested; 25 enum { 26 FlagsLvalueBit = is_lvalue<MatrixType>::value ? LvalueBit : 0, 27 Flags = traits<_MatrixTypeNested>::Flags & (RowMajorBit | FlagsLvalueBit | DirectAccessBit), // FIXME DirectAccessBit should not be handled by expressions 28 MatrixTypeInnerStride = inner_stride_at_compile_time<MatrixType>::ret, 29 // need to cast the sizeof's from size_t to int explicitly, otherwise: 30 // "error: no integral type can represent all of the enumerator values 31 InnerStrideAtCompileTime = MatrixTypeInnerStride == Dynamic 32 ? int(Dynamic) 33 : int(MatrixTypeInnerStride) * int(sizeof(typename traits<MatrixType>::Scalar) / sizeof(Scalar)), 34 OuterStrideAtCompileTime = outer_stride_at_compile_time<MatrixType>::ret == Dynamic 35 ? int(Dynamic) 36 : outer_stride_at_compile_time<MatrixType>::ret * int(sizeof(typename traits<MatrixType>::Scalar) / sizeof(Scalar)) 37 }; 38 }; 39 } 40 41 template<typename ViewOp, typename MatrixType, typename StorageKind> 42 class CwiseUnaryViewImpl; 43 44 /** \class CwiseUnaryView 45 * \ingroup Core_Module 46 * 47 * \brief Generic lvalue expression of a coefficient-wise unary operator of a matrix or a vector 48 * 49 * \tparam ViewOp template functor implementing the view 50 * \tparam MatrixType the type of the matrix we are applying the unary operator 51 * 52 * This class represents a lvalue expression of a generic unary view operator of a matrix or a vector. 53 * It is the return type of real() and imag(), and most of the time this is the only way it is used. 54 * 55 * \sa MatrixBase::unaryViewExpr(const CustomUnaryOp &) const, class CwiseUnaryOp 56 */ 57 template<typename ViewOp, typename MatrixType> 58 class CwiseUnaryView : public CwiseUnaryViewImpl<ViewOp, MatrixType, typename internal::traits<MatrixType>::StorageKind> 59 { 60 public: 61 62 typedef typename CwiseUnaryViewImpl<ViewOp, MatrixType,typename internal::traits<MatrixType>::StorageKind>::Base Base; 63 EIGEN_GENERIC_PUBLIC_INTERFACE(CwiseUnaryView) 64 typedef typename internal::ref_selector<MatrixType>::non_const_type MatrixTypeNested; 65 typedef typename internal::remove_all<MatrixType>::type NestedExpression; 66 67 explicit EIGEN_DEVICE_FUNC inline CwiseUnaryView(MatrixType& mat, const ViewOp& func = ViewOp()) 68 : m_matrix(mat), m_functor(func) {} 69 70 EIGEN_INHERIT_ASSIGNMENT_OPERATORS(CwiseUnaryView) 71 72 EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR 73 Index rows() const EIGEN_NOEXCEPT { return m_matrix.rows(); } 74 EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR 75 Index cols() const EIGEN_NOEXCEPT { return m_matrix.cols(); } 76 77 /** \returns the functor representing unary operation */ 78 EIGEN_DEVICE_FUNC const ViewOp& functor() const { return m_functor; } 79 80 /** \returns the nested expression */ 81 EIGEN_DEVICE_FUNC const typename internal::remove_all<MatrixTypeNested>::type& 82 nestedExpression() const { return m_matrix; } 83 84 /** \returns the nested expression */ 85 EIGEN_DEVICE_FUNC typename internal::remove_reference<MatrixTypeNested>::type& 86 nestedExpression() { return m_matrix; } 87 88 protected: 89 MatrixTypeNested m_matrix; 90 ViewOp m_functor; 91 }; 92 93 // Generic API dispatcher 94 template<typename ViewOp, typename XprType, typename StorageKind> 95 class CwiseUnaryViewImpl 96 : public internal::generic_xpr_base<CwiseUnaryView<ViewOp, XprType> >::type 97 { 98 public: 99 typedef typename internal::generic_xpr_base<CwiseUnaryView<ViewOp, XprType> >::type Base; 100 }; 101 102 template<typename ViewOp, typename MatrixType> 103 class CwiseUnaryViewImpl<ViewOp,MatrixType,Dense> 104 : public internal::dense_xpr_base< CwiseUnaryView<ViewOp, MatrixType> >::type 105 { 106 public: 107 108 typedef CwiseUnaryView<ViewOp, MatrixType> Derived; 109 typedef typename internal::dense_xpr_base< CwiseUnaryView<ViewOp, MatrixType> >::type Base; 110 111 EIGEN_DENSE_PUBLIC_INTERFACE(Derived) 112 EIGEN_INHERIT_ASSIGNMENT_OPERATORS(CwiseUnaryViewImpl) 113 114 EIGEN_DEVICE_FUNC inline Scalar* data() { return &(this->coeffRef(0)); } 115 EIGEN_DEVICE_FUNC inline const Scalar* data() const { return &(this->coeff(0)); } 116 117 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index innerStride() const 118 { 119 return derived().nestedExpression().innerStride() * sizeof(typename internal::traits<MatrixType>::Scalar) / sizeof(Scalar); 120 } 121 122 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index outerStride() const 123 { 124 return derived().nestedExpression().outerStride() * sizeof(typename internal::traits<MatrixType>::Scalar) / sizeof(Scalar); 125 } 126 protected: 127 EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(CwiseUnaryViewImpl) 128 }; 129 130 } // end namespace Eigen 131 132 #endif // EIGEN_CWISE_UNARY_VIEW_H 133