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115 lines
5.7 KiB
C++
115 lines
5.7 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_SCALARMULTIPLE_H
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#define EIGEN_SCALARMULTIPLE_H
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template<typename FactorType, typename MatrixType> class ScalarMultiple : NoOperatorEquals,
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public MatrixBase<typename MatrixType::Scalar, ScalarMultiple<FactorType, 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, ScalarMultiple<FactorType, MatrixType> >;
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ScalarMultiple(const MatRef& matrix, FactorType factor)
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: m_matrix(matrix), m_factor(factor) {}
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ScalarMultiple(const ScalarMultiple& other)
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: m_matrix(other.m_matrix), m_factor(other.m_factor) {}
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private:
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static const int _RowsAtCompileTime = MatrixType::RowsAtCompileTime,
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_ColsAtCompileTime = MatrixType::ColsAtCompileTime;
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const ScalarMultiple& _ref() const { return *this; }
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int _rows() const { return m_matrix.rows(); }
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int _cols() const { return m_matrix.cols(); }
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Scalar _coeff(int row, int col) const
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{
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return m_factor * m_matrix.coeff(row, col);
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}
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protected:
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const MatRef m_matrix;
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const FactorType m_factor;
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};
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#define EIGEN_MAKE_SCALAR_OPS(FactorType) \
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/** \relates MatrixBase */ \
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template<typename Scalar, typename Derived> \
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const ScalarMultiple<FactorType, Derived> \
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operator*(const MatrixBase<Scalar, Derived>& matrix, \
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FactorType scalar) \
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{ \
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return ScalarMultiple<FactorType, Derived>(matrix.ref(), scalar); \
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} \
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\
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/** \relates MatrixBase */ \
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template<typename Scalar, typename Derived> \
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const ScalarMultiple<FactorType, Derived> \
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operator*(FactorType scalar, \
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const MatrixBase<Scalar, Derived>& matrix) \
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{ \
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return ScalarMultiple<FactorType, Derived>(matrix.ref(), scalar); \
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} \
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\
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/** \relates MatrixBase */ \
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template<typename Scalar, typename Derived> \
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const ScalarMultiple<typename NumTraits<FactorType>::FloatingPoint, Derived> \
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operator/(const MatrixBase<Scalar, Derived>& matrix, \
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FactorType scalar) \
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{ \
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assert(NumTraits<Scalar>::HasFloatingPoint); \
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return matrix * (static_cast< \
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typename NumTraits<FactorType>::FloatingPoint \
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>(1) / scalar); \
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} \
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\
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template<typename Scalar, typename Derived> \
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Derived & \
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MatrixBase<Scalar, Derived>::operator*=(const FactorType &other) \
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{ \
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return *this = *this * other; \
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} \
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\
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template<typename Scalar, typename Derived> \
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Derived & \
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MatrixBase<Scalar, Derived>::operator/=(const FactorType &other) \
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{ \
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return *this = *this / other; \
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}
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EIGEN_MAKE_SCALAR_OPS(int)
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EIGEN_MAKE_SCALAR_OPS(float)
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EIGEN_MAKE_SCALAR_OPS(double)
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EIGEN_MAKE_SCALAR_OPS(std::complex<float>)
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EIGEN_MAKE_SCALAR_OPS(std::complex<double>)
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#undef EIGEN_MAKE_SCALAR_OPS
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#endif // EIGEN_SCALARMULTIPLE_H
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