140 lines
5.4 KiB
C++
140 lines
5.4 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef EIGEN_CWISE_UNARY_VIEW_H
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#define EIGEN_CWISE_UNARY_VIEW_H
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namespace Eigen {
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/** \class CwiseUnaryView
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* \ingroup Core_Module
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*
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* \brief Generic lvalue expression of a coefficient-wise unary operator of a matrix or a vector
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*
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* \param ViewOp template functor implementing the view
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* \param MatrixType the type of the matrix we are applying the unary operator
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*
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* This class represents a lvalue expression of a generic unary view operator of a matrix or a vector.
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* It is the return type of real() and imag(), and most of the time this is the only way it is used.
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*
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* \sa MatrixBase::unaryViewExpr(const CustomUnaryOp &) const, class CwiseUnaryOp
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*/
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namespace internal {
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template<typename ViewOp, typename MatrixType>
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struct traits<CwiseUnaryView<ViewOp, MatrixType> >
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: traits<MatrixType>
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{
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typedef typename result_of<
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ViewOp(typename traits<MatrixType>::Scalar)
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>::type Scalar;
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typedef typename MatrixType::Nested MatrixTypeNested;
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typedef typename remove_all<MatrixTypeNested>::type _MatrixTypeNested;
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enum {
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Flags = (traits<_MatrixTypeNested>::Flags & (HereditaryBits | LvalueBit | LinearAccessBit | DirectAccessBit)),
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CoeffReadCost = traits<_MatrixTypeNested>::CoeffReadCost + functor_traits<ViewOp>::Cost,
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MatrixTypeInnerStride = inner_stride_at_compile_time<MatrixType>::ret,
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// need to cast the sizeof's from size_t to int explicitly, otherwise:
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// "error: no integral type can represent all of the enumerator values
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InnerStrideAtCompileTime = MatrixTypeInnerStride == Dynamic
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? int(Dynamic)
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: int(MatrixTypeInnerStride) * int(sizeof(typename traits<MatrixType>::Scalar) / sizeof(Scalar)),
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OuterStrideAtCompileTime = outer_stride_at_compile_time<MatrixType>::ret == Dynamic
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? int(Dynamic)
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: outer_stride_at_compile_time<MatrixType>::ret * int(sizeof(typename traits<MatrixType>::Scalar) / sizeof(Scalar))
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};
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};
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}
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template<typename ViewOp, typename MatrixType, typename StorageKind>
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class CwiseUnaryViewImpl;
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template<typename ViewOp, typename MatrixType>
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class CwiseUnaryView : public CwiseUnaryViewImpl<ViewOp, MatrixType, typename internal::traits<MatrixType>::StorageKind>
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{
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public:
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typedef typename CwiseUnaryViewImpl<ViewOp, MatrixType,typename internal::traits<MatrixType>::StorageKind>::Base Base;
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EIGEN_GENERIC_PUBLIC_INTERFACE(CwiseUnaryView)
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inline CwiseUnaryView(const MatrixType& mat, const ViewOp& func = ViewOp())
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: m_matrix(mat), m_functor(func) {}
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EIGEN_INHERIT_ASSIGNMENT_OPERATORS(CwiseUnaryView)
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EIGEN_STRONG_INLINE Index rows() const { return m_matrix.rows(); }
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EIGEN_STRONG_INLINE Index cols() const { return m_matrix.cols(); }
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/** \returns the functor representing unary operation */
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const ViewOp& functor() const { return m_functor; }
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/** \returns the nested expression */
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const typename internal::remove_all<typename MatrixType::Nested>::type&
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nestedExpression() const { return m_matrix; }
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/** \returns the nested expression */
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typename internal::remove_all<typename MatrixType::Nested>::type&
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nestedExpression() { return m_matrix.const_cast_derived(); }
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protected:
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// FIXME changed from MatrixType::Nested because of a weird compilation error with sun CC
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typename internal::nested<MatrixType>::type m_matrix;
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ViewOp m_functor;
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};
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template<typename ViewOp, typename MatrixType>
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class CwiseUnaryViewImpl<ViewOp,MatrixType,Dense>
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: public internal::dense_xpr_base< CwiseUnaryView<ViewOp, MatrixType> >::type
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{
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public:
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typedef CwiseUnaryView<ViewOp, MatrixType> Derived;
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typedef typename internal::dense_xpr_base< CwiseUnaryView<ViewOp, MatrixType> >::type Base;
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EIGEN_DENSE_PUBLIC_INTERFACE(Derived)
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EIGEN_INHERIT_ASSIGNMENT_OPERATORS(CwiseUnaryViewImpl)
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inline Scalar* data() { return &coeffRef(0); }
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inline const Scalar* data() const { return &coeff(0); }
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inline Index innerStride() const
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{
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return derived().nestedExpression().innerStride() * sizeof(typename internal::traits<MatrixType>::Scalar) / sizeof(Scalar);
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}
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inline Index outerStride() const
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{
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return derived().nestedExpression().outerStride() * sizeof(typename internal::traits<MatrixType>::Scalar) / sizeof(Scalar);
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}
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EIGEN_STRONG_INLINE CoeffReturnType coeff(Index row, Index col) const
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{
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return derived().functor()(derived().nestedExpression().coeff(row, col));
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}
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EIGEN_STRONG_INLINE CoeffReturnType coeff(Index index) const
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{
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return derived().functor()(derived().nestedExpression().coeff(index));
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}
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EIGEN_STRONG_INLINE Scalar& coeffRef(Index row, Index col)
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{
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return derived().functor()(const_cast_derived().nestedExpression().coeffRef(row, col));
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}
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EIGEN_STRONG_INLINE Scalar& coeffRef(Index index)
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{
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return derived().functor()(const_cast_derived().nestedExpression().coeffRef(index));
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}
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};
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} // end namespace Eigen
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#endif // EIGEN_CWISE_UNARY_VIEW_H
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