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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) 2008 Gael Guennebaud <g.gael@free.fr>
// 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_NESTBYVALUE_H
#define EIGEN_NESTBYVALUE_H
/** \class NestByValue
*
* \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<NestByValue<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 NestByValue
: public MatrixBase<NestByValue<ExpressionType> >
{
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(NestByValue)
inline NestByValue(const ExpressionType& matrix) : m_expression(matrix) {}
private:
inline int _rows() const { return m_expression.rows(); }
inline int _cols() const { return m_expression.cols(); }
inline int _stride() const { return m_expression.stride(); }
inline const Scalar _coeff(int row, int col) const
{
return m_expression.coeff(row, col);
}
inline Scalar& _coeffRef(int row, int col)
{
return m_expression.const_cast_derived().coeffRef(row, col);
}
template<int LoadMode>
inline const PacketScalar _packetCoeff(int row, int col) const
{
return m_expression.template packetCoeff<LoadMode>(row, col);
}
template<int LoadMode>
inline void _writePacketCoeff(int row, int col, const PacketScalar& x)
{
m_expression.const_cast_derived().template writePacketCoeff<LoadMode>(row, col, x);
}
protected:
const ExpressionType m_expression;
};
/** \returns an expression of the temporary version of *this.
*/
template<typename Derived>
inline const NestByValue<Derived>
MatrixBase<Derived>::nestByValue() const
{
return NestByValue<Derived>(derived());
}
#endif // EIGEN_NESTBYVALUE_H
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