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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) 2006-2008 Benoit Jacob <jacob@math.jussieu.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_SWAP_H
#define EIGEN_SWAP_H
/** \class SwapWrapper
*
* \brief Expression which must be nested by value
*
* \param ExpressionType the type of the object of which we are requiring nesting-by-value
*
* This class is the return type of MatrixBase::nestByValue()
* and most of the time this is the only way it is used.
*
* \sa MatrixBase::nestByValue()
*/
template<typename ExpressionType>
struct ei_traits<SwapWrapper<ExpressionType> >
{
typedef typename ExpressionType::Scalar Scalar;
enum {
RowsAtCompileTime = ExpressionType::RowsAtCompileTime,
ColsAtCompileTime = ExpressionType::ColsAtCompileTime,
MaxRowsAtCompileTime = ExpressionType::MaxRowsAtCompileTime,
MaxColsAtCompileTime = ExpressionType::MaxColsAtCompileTime,
Flags = ExpressionType::Flags,
CoeffReadCost = ExpressionType::CoeffReadCost
};
};
template<typename ExpressionType> class SwapWrapper
: public MatrixBase<SwapWrapper<ExpressionType> >
{
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(SwapWrapper)
typedef typename ei_packet_traits<Scalar>::type Packet;
inline SwapWrapper(ExpressionType& matrix) : m_expression(matrix) {}
inline int rows() const { return m_expression.rows(); }
inline int cols() const { return m_expression.cols(); }
inline int stride() const { return m_expression.stride(); }
template<typename OtherDerived>
void copyCoeff(int row, int col, const MatrixBase<OtherDerived>& other)
{
OtherDerived& _other = other.const_cast_derived();
ei_internal_assert(row >= 0 && row < rows()
&& col >= 0 && col < cols());
Scalar tmp = m_expression.coeff(row, col);
m_expression.coeffRef(row, col) = _other.coeff(row, col);
_other.coeffRef(row, col) = tmp;
}
template<typename OtherDerived>
void copyCoeff(int index, const MatrixBase<OtherDerived>& other)
{
OtherDerived& _other = other.const_cast_derived();
ei_internal_assert(index >= 0 && index < m_expression.size());
Scalar tmp = m_expression.coeff(index);
m_expression.coeffRef(index) = _other.coeff(index);
_other.coeffRef(index) = tmp;
}
template<typename OtherDerived, int LoadStoreMode>
void copyPacket(int row, int col, const MatrixBase<OtherDerived>& other)
{
OtherDerived& _other = other.const_cast_derived();
ei_internal_assert(row >= 0 && row < rows()
&& col >= 0 && col < cols());
Packet tmp = m_expression.template packet<LoadStoreMode>(row, col);
m_expression.template writePacket<LoadStoreMode>(row, col,
_other.template packet<LoadStoreMode>(row, col)
);
_other.template writePacket<LoadStoreMode>(row, col, tmp);
}
template<typename OtherDerived, int LoadStoreMode>
void copyPacket(int index, const MatrixBase<OtherDerived>& other)
{
OtherDerived& _other = other.const_cast_derived();
ei_internal_assert(index >= 0 && index < m_expression.size());
Packet tmp = m_expression.template packet<LoadStoreMode>(index);
m_expression.template writePacket<LoadStoreMode>(index,
_other.template packet<LoadStoreMode>(index)
);
_other.template writePacket<LoadStoreMode>(index, tmp);
}
protected:
ExpressionType m_expression;
};
/** swaps *this with the expression \a other.
*
* \note \a other is only marked const because I couln't find another way
* to get g++ (4.2 and 4.3) to accept that template parameter resolution.
* The problem seems to be that when swapping expressions as in
* m.row(i).swap(m.row(j)); the Row object returned by row(j) is a temporary
* and g++ doesn't dare to pass it by non-constant reference.
* It gets const_cast'd of course. TODO: get rid of const here.
*/
template<typename Derived>
template<typename OtherDerived>
void MatrixBase<Derived>::swap(const MatrixBase<OtherDerived>& other)
{
SwapWrapper<Derived>(derived()).lazyAssign(other);
}
#endif // EIGEN_SWAP_H
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