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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_MATRIXXPR_H
#define EIGEN_MATRIXXPR_H
namespace Eigen {
//forward declarations
template<typename MatrixType> class MatrixRow;
template<typename MatrixType> class MatrixCol;
template<typename MatrixType> class MatrixMinor;
template<typename MatrixType> class MatrixBlock;
template<typename Content> class MatrixXpr
{
public:
typedef typename Content::Scalar Scalar;
MatrixXpr(const Content& content)
: m_content(content) {}
MatrixXpr(const MatrixXpr& other)
: m_content(other.m_content) {}
~MatrixXpr() {}
int rows() const { return m_content.rows(); }
int cols() const { return m_content.cols(); }
Scalar& write(int row, int col)
{
return m_content.write(row, col);
}
Scalar read(int row, int col) const
{
return m_content.read(row, col);
}
template<typename OtherContent>
MatrixXpr& operator=(const MatrixXpr<OtherContent>& other)
{
assert(rows() == other.rows() && cols() == other.cols());
for(int i = 0; i < rows(); i++)
for(int j = 0; j < cols(); j++)
write(i, j) = other.read(i, j);
return *this;
}
//special case of the above template operator=. Strangely, g++ 4.1 failed to use
//that template when OtherContent == Content
MatrixXpr& operator=(const MatrixXpr& other)
{
assert(rows() == other.rows() && cols() == other.cols());
for(int i = 0; i < rows(); i++)
for(int j = 0; j < cols(); j++)
write(i, j) = other.read(i, j);
return *this;
}
template<typename Derived>
MatrixXpr& operator=(const MatrixBase<Derived>& matrix);
MatrixXpr<MatrixRow<MatrixXpr<Content> > > row(int i);
MatrixXpr<MatrixCol<MatrixXpr<Content> > > col(int i);
MatrixXpr<MatrixMinor<MatrixXpr<Content> > > minor(int row, int col);
MatrixXpr<MatrixBlock<MatrixXpr<Content> > >
block(int startRow, int endRow, int startCol= 0, int endCol = 0);
template<typename Content2>
MatrixXpr& operator+=(const MatrixXpr<Content2> &other);
template<typename Content2>
MatrixXpr& operator-=(const MatrixXpr<Content2> &other);
template<typename Derived>
MatrixXpr& operator+=(MatrixBase<Derived> &matrix);
template<typename Derived>
MatrixXpr& operator-=(MatrixBase<Derived> &matrix);
protected:
Content m_content;
};
} // namespace Eigen
#endif // EIGEN_MATRIXXPR_H
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