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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) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
//
// Eigen is free software; 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 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 General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along
// with Eigen; if not, write to the Free Software Foundation, Inc., 51
// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. This exception does not invalidate any other reasons why a work
// based on this file might be covered by the GNU General Public License.
#ifndef EIGEN_MATRIXALIAS_H
#define EIGEN_MATRIXALIAS_H
namespace Eigen
{
template<typename Derived> class MatrixAlias
{
public:
typedef typename Derived::Scalar Scalar;
typedef MatrixRef<MatrixAlias<Derived> > Ref;
typedef MatrixXpr<Ref> Xpr;
MatrixAlias(Derived& matrix) : m_aliased(matrix), m_tmp(matrix) {}
MatrixAlias(const MatrixAlias& other) : m_aliased(other.m_aliased), m_tmp(other.m_tmp) {}
~MatrixAlias()
{
m_aliased.xpr() = m_tmp;
}
Ref ref()
{
return Ref(*this);
}
Xpr xpr()
{
return Xpr(ref());
}
static bool hasDynamicNumRows()
{
return MatrixBase<Derived>::hasDynamicNumRows();
}
static bool hasDynamicNumCols()
{
return MatrixBase<Derived>::hasDynamicNumCols();
}
int rows() const { return m_tmp.rows(); }
int cols() const { return m_tmp.cols(); }
Scalar& write(int row, int col)
{
return m_tmp.write(row, col);
}
MatrixXpr<MatrixRow<Xpr> > row(int i) { return xpr().row(i); };
MatrixXpr<MatrixCol<Xpr> > col(int i) { return xpr().col(i); };
MatrixXpr<MatrixMinor<Xpr> > minor(int row, int col) { return xpr().minor(row, col); };
MatrixXpr<MatrixBlock<Xpr> >
block(int startRow, int endRow, int startCol = 0, int endCol = 0)
{
return xpr().block(startRow, endRow, startCol, endCol);
}
template<typename XprContent>
void operator=(const MatrixXpr<XprContent> &other)
{
xpr() = other;
}
template<typename XprContent>
void operator+=(const MatrixXpr<XprContent> &other)
{
xpr() += other;
}
template<typename XprContent>
void operator-=(const MatrixXpr<XprContent> &other)
{
xpr() -= other;
}
protected:
MatrixRef<MatrixBase<Derived> > m_aliased;
Derived m_tmp;
};
template<typename Derived>
typename MatrixBase<Derived>::Alias
MatrixBase<Derived>::alias()
{
return Alias(*static_cast<Derived*>(this));
}
} // namespace Eigen
#endif // EIGEN_MATRIXALIAS_H
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