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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_ROW_H
#define EIGEN_ROW_H
/** \class Row
*
* \brief Expression of a row
*
* \param MatrixType the type of the object in which we are taking a row
*
* This class represents an expression of a row. It is the return
* type of MatrixBase::row() and most of the time this is the only way it
* is used.
*
* However, if you want to directly maniputate row expressions,
* for instance if you want to write a function returning such an expression, you
* will need to use this class.
*
* Here is an example illustrating this:
* \include class_Row.cpp
* Output: \verbinclude class_Row.out
*
* \sa MatrixBase::row()
*/
template<typename MatrixType>
struct Scalar<Row<MatrixType> >
{ typedef typename Scalar<MatrixType>::Type Type; };
template<typename MatrixType> class Row
: public MatrixBase<Row<MatrixType> >
{
public:
typedef typename Scalar<MatrixType>::Type Scalar;
typedef typename MatrixType::AsArg MatRef;
friend class MatrixBase<Row>;
friend class MatrixBase<Row>::Traits;
typedef MatrixBase<Row> Base;
Row(const MatRef& matrix, int row)
: m_matrix(matrix), m_row(row)
{
assert(row >= 0 && row < matrix.rows());
}
EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Row)
private:
enum {
RowsAtCompileTime = 1,
ColsAtCompileTime = MatrixType::Traits::ColsAtCompileTime,
MaxRowsAtCompileTime = 1,
MaxColsAtCompileTime = MatrixType::Traits::MaxColsAtCompileTime
};
const Row& _asArg() const { return *this; }
int _rows() const { return 1; }
int _cols() const { return m_matrix.cols(); }
Scalar& _coeffRef(int, int col)
{
return m_matrix.coeffRef(m_row, col);
}
Scalar _coeff(int, int col) const
{
return m_matrix.coeff(m_row, col);
}
protected:
MatRef m_matrix;
const int m_row;
};
/** \returns an expression of the \a i-th row of *this. Note that the numbering starts at 0.
*
* Example: \include MatrixBase_row.cpp
* Output: \verbinclude MatrixBase_row.out
*
* \sa col(), class Row */
template<typename Derived>
Row<Derived>
MatrixBase<Derived>::row(int i)
{
return Row<Derived>(asArg(), i);
}
/** This is the const version of row(). */
template<typename Derived>
const Row<Derived>
MatrixBase<Derived>::row(int i) const
{
return Row<Derived>(asArg(), i);
}
#endif // EIGEN_ROW_H
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