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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2009 Gael Guennebaud <g.gael@free.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_CWISE_UNARY_VIEW_H
#define EIGEN_CWISE_UNARY_VIEW_H
/** \class CwiseUnaryView
*
* \brief Generic lvalue expression of a coefficient-wise unary operator of a matrix or a vector
*
* \param ViewOp template functor implementing the view
* \param MatrixType the type of the matrix we are applying the unary operator
*
* This class represents a lvalue expression of a generic unary view operator of a matrix or a vector.
* It is the return type of real() and imag(), and most of the time this is the only way it is used.
*
* \sa MatrixBase::unaryViewExpr(const CustomUnaryOp &) const, class CwiseUnaryOp
*/
template<typename ViewOp, typename MatrixType>
struct ei_traits<CwiseUnaryView<ViewOp, MatrixType> >
: ei_traits<MatrixType>
{
typedef typename ei_result_of<
ViewOp(typename MatrixType::Scalar)
>::type Scalar;
typedef typename MatrixType::Nested MatrixTypeNested;
typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
enum {
Flags = (_MatrixTypeNested::Flags & (HereditaryBits | LinearAccessBit | AlignedBit)),
CoeffReadCost = _MatrixTypeNested::CoeffReadCost + ei_functor_traits<ViewOp>::Cost
};
};
template<typename ViewOp, typename MatrixType>
class CwiseUnaryView : ei_no_assignment_operator,
public MatrixBase<CwiseUnaryView<ViewOp, MatrixType> >
{
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(CwiseUnaryView)
inline CwiseUnaryView(const MatrixType& mat, const ViewOp& func = ViewOp())
: m_matrix(mat), m_functor(func) {}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(CwiseUnaryView)
EIGEN_STRONG_INLINE int rows() const { return m_matrix.rows(); }
EIGEN_STRONG_INLINE int cols() const { return m_matrix.cols(); }
EIGEN_STRONG_INLINE const Scalar coeff(int row, int col) const
{
return m_functor(m_matrix.coeff(row, col));
}
EIGEN_STRONG_INLINE const Scalar coeff(int index) const
{
return m_functor(m_matrix.coeff(index));
}
EIGEN_STRONG_INLINE Scalar& coeffRef(int row, int col)
{
return m_functor(m_matrix.const_cast_derived().coeffRef(row, col));
}
EIGEN_STRONG_INLINE Scalar& coeffRef(int index)
{
return m_functor(m_matrix.const_cast_derived().coeffRef(index));
}
protected:
const typename MatrixType::Nested m_matrix;
const ViewOp m_functor;
};
/** \returns an expression of a custom coefficient-wise unary operator \a func of *this
*
* The template parameter \a CustomUnaryOp is the type of the functor
* of the custom unary operator.
*
* \addexample CustomCwiseUnaryFunctors \label How to use custom coeff wise unary functors
*
* Example:
* \include class_CwiseUnaryOp.cpp
* Output: \verbinclude class_CwiseUnaryOp.out
*
* \sa class CwiseUnaryOp, class CwiseBinarOp, MatrixBase::operator-, Cwise::abs
*/
template<typename Derived>
template<typename CustomViewOp>
EIGEN_STRONG_INLINE const CwiseUnaryView<CustomViewOp, Derived>
MatrixBase<Derived>::unaryViewExpr(const CustomViewOp& func) const
{
return CwiseUnaryView<CustomViewOp, Derived>(derived(), func);
}
/** \returns a non const expression of the real part of \c *this.
*
* \sa imag() */
template<typename Derived>
EIGEN_STRONG_INLINE typename MatrixBase<Derived>::NonConstRealReturnType
MatrixBase<Derived>::real() { return derived(); }
/** \returns a non const expression of the imaginary part of \c *this.
*
* \sa real() */
template<typename Derived>
EIGEN_STRONG_INLINE typename MatrixBase<Derived>::NonConstImagReturnType
MatrixBase<Derived>::imag() { return derived(); }
#endif // EIGEN_CWISE_UNARY_VIEW_H
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