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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// 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_OP_H
#define EIGEN_CWISE_UNARY_OP_H
/** \class CwiseUnaryOp
*
* \brief Generic expression of a coefficient-wise unary operator of a matrix or a vector
*
* \param UnaryOp template functor implementing the operator
* \param MatrixType the type of the matrix we are applying the unary operator
*
* This class represents an expression of a generic unary operator of a matrix or a vector.
* It is the return type of the unary operator-, of a matrix or a vector, and most
* of the time this is the only way it is used.
*
* \sa MatrixBase::unaryExpr(const CustomUnaryOp &) const, class CwiseBinaryOp, class CwiseNullaryOp
*/
template<typename UnaryOp, typename MatrixType>
struct ei_traits<CwiseUnaryOp<UnaryOp, MatrixType> >
: ei_traits<MatrixType>
{
typedef typename ei_result_of<
UnaryOp(typename MatrixType::Scalar)
>::type Scalar;
typedef typename MatrixType::Nested MatrixTypeNested;
typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
enum {
Flags = (_MatrixTypeNested::Flags & (
HereditaryBits | LinearAccessBit | AlignedBit
| (ei_functor_traits<UnaryOp>::PacketAccess ? PacketAccessBit : 0))),
CoeffReadCost = _MatrixTypeNested::CoeffReadCost + ei_functor_traits<UnaryOp>::Cost
};
};
template<typename UnaryOp, typename MatrixType>
class CwiseUnaryOp : ei_no_assignment_operator,
public MatrixBase<CwiseUnaryOp<UnaryOp, MatrixType> >
{
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(CwiseUnaryOp)
inline CwiseUnaryOp(const MatrixType& mat, const UnaryOp& func = UnaryOp())
: m_matrix(mat), m_functor(func) {}
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));
}
template<int LoadMode>
EIGEN_STRONG_INLINE PacketScalar packet(int row, int col) const
{
return m_functor.packetOp(m_matrix.template packet<LoadMode>(row, col));
}
EIGEN_STRONG_INLINE const Scalar coeff(int index) const
{
return m_functor(m_matrix.coeff(index));
}
template<int LoadMode>
EIGEN_STRONG_INLINE PacketScalar packet(int index) const
{
return m_functor.packetOp(m_matrix.template packet<LoadMode>(index));
}
/** \internal used for introspection */
const UnaryOp& _functor() const { return m_functor; }
/** \internal used for introspection */
const typename ei_cleantype<typename MatrixType::Nested>::type&
_expression() const { return m_matrix; }
protected:
const typename MatrixType::Nested m_matrix;
const UnaryOp 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 CustomUnaryOp>
EIGEN_STRONG_INLINE const CwiseUnaryOp<CustomUnaryOp, Derived>
MatrixBase<Derived>::unaryExpr(const CustomUnaryOp& func) const
{
return CwiseUnaryOp<CustomUnaryOp, Derived>(derived(), func);
}
/** \returns an expression of the opposite of \c *this
*/
template<typename Derived>
EIGEN_STRONG_INLINE const CwiseUnaryOp<ei_scalar_opposite_op<typename ei_traits<Derived>::Scalar>,Derived>
MatrixBase<Derived>::operator-() const
{
return derived();
}
/** \returns an expression of the coefficient-wise absolute value of \c *this
*
* Example: \include Cwise_abs.cpp
* Output: \verbinclude Cwise_abs.out
*
* \sa abs2()
*/
template<typename ExpressionType>
EIGEN_STRONG_INLINE const EIGEN_CWISE_UNOP_RETURN_TYPE(ei_scalar_abs_op)
Cwise<ExpressionType>::abs() const
{
return _expression();
}
/** \returns an expression of the coefficient-wise squared absolute value of \c *this
*
* Example: \include Cwise_abs2.cpp
* Output: \verbinclude Cwise_abs2.out
*
* \sa abs(), square()
*/
template<typename ExpressionType>
EIGEN_STRONG_INLINE const EIGEN_CWISE_UNOP_RETURN_TYPE(ei_scalar_abs2_op)
Cwise<ExpressionType>::abs2() const
{
return _expression();
}
/** \returns an expression of the complex conjugate of \c *this.
*
* \sa adjoint() */
template<typename Derived>
EIGEN_STRONG_INLINE typename MatrixBase<Derived>::ConjugateReturnType
MatrixBase<Derived>::conjugate() const
{
return ConjugateReturnType(derived());
}
/** \returns a read-only expression of the real part of \c *this.
*
* \sa imag() */
template<typename Derived>
EIGEN_STRONG_INLINE typename MatrixBase<Derived>::RealReturnType
MatrixBase<Derived>::real() const { return derived(); }
/** \returns an read-only expression of the imaginary part of \c *this.
*
* \sa real() */
template<typename Derived>
EIGEN_STRONG_INLINE const typename MatrixBase<Derived>::ImagReturnType
MatrixBase<Derived>::imag() const { return derived(); }
/** \returns an expression of *this with the \a Scalar type casted to
* \a NewScalar.
*
* The template parameter \a NewScalar is the type we are casting the scalars to.
*
* \sa class CwiseUnaryOp
*/
template<typename Derived>
template<typename NewType>
EIGEN_STRONG_INLINE
typename ei_cast_return_type<
Derived,
const CwiseUnaryOp<ei_scalar_cast_op<typename ei_traits<Derived>::Scalar, NewType>, Derived>
>::type
MatrixBase<Derived>::cast() const
{
return derived();
}
/** \relates MatrixBase */
template<typename Derived>
EIGEN_STRONG_INLINE const typename MatrixBase<Derived>::ScalarMultipleReturnType
MatrixBase<Derived>::operator*(const Scalar& scalar) const
{
return CwiseUnaryOp<ei_scalar_multiple_op<Scalar>, Derived>
(derived(), ei_scalar_multiple_op<Scalar>(scalar));
}
/** \relates MatrixBase */
template<typename Derived>
EIGEN_STRONG_INLINE const CwiseUnaryOp<ei_scalar_quotient1_op<typename ei_traits<Derived>::Scalar>, Derived>
MatrixBase<Derived>::operator/(const Scalar& scalar) const
{
return CwiseUnaryOp<ei_scalar_quotient1_op<Scalar>, Derived>
(derived(), ei_scalar_quotient1_op<Scalar>(scalar));
}
template<typename Derived>
EIGEN_STRONG_INLINE Derived&
MatrixBase<Derived>::operator*=(const Scalar& other)
{
return *this = *this * other;
}
template<typename Derived>
EIGEN_STRONG_INLINE Derived&
MatrixBase<Derived>::operator/=(const Scalar& other)
{
return *this = *this / other;
}
#endif // EIGEN_CWISE_UNARY_OP_H
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