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74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra. Eigen itself is part of the KDE project.
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//
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// Copyright (C) 2006-2007 Benoit Jacob <jacob@math.jussieu.fr>
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//
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// Eigen is free software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the Free Software
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// Foundation; either version 2 or (at your option) any later version.
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//
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// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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// details.
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//
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// You should have received a copy of the GNU General Public License along
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// with Eigen; if not, write to the Free Software Foundation, Inc., 51
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// Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. This exception does not invalidate any other reasons why a work
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// based on this file might be covered by the GNU General Public License.
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#ifndef EIGEN_DIAGONALCOEFFS_H
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#define EIGEN_DIAGONALCOEFFS_H
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template<typename MatrixType> class DiagonalCoeffs
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: public MatrixBase<typename MatrixType::Scalar, DiagonalCoeffs<MatrixType> >
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{
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public:
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typedef typename MatrixType::Scalar Scalar;
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typedef typename MatrixType::Ref MatRef;
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friend class MatrixBase<Scalar, DiagonalCoeffs<MatrixType> >;
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DiagonalCoeffs(const MatRef& matrix) : m_matrix(matrix) {}
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DiagonalCoeffs(const DiagonalCoeffs& other) : m_matrix(other.m_matrix) {}
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EIGEN_INHERIT_ASSIGNMENT_OPERATORS(DiagonalCoeffs)
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private:
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static const int _RowsAtCompileTime = MatrixType::RowsAtCompileTime,
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_ColsAtCompileTime = 1;
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const DiagonalCoeffs& _ref() const { return *this; }
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int _rows() const { return std::min(m_matrix.rows(), m_matrix.cols()); }
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int _cols() const { return 1; }
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Scalar& _coeffRef(int row, int)
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{
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return m_matrix.coeffRef(row, row);
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}
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Scalar _coeff(int row, int) const
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{
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return m_matrix.coeff(row, row);
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}
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protected:
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MatRef m_matrix;
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};
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template<typename Scalar, typename Derived>
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DiagonalCoeffs<Derived>
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MatrixBase<Scalar, Derived>::diagonal() const
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{
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return DiagonalCoeffs<Derived>
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(static_cast<Derived*>(const_cast<MatrixBase*>(this))->ref());
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}
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#endif // EIGEN_DIAGONALCOEFFS_H
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