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122 lines
3.6 KiB
C++
122 lines
3.6 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_SCALAROPS_H
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#define EIGEN_SCALAROPS_H
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namespace Eigen {
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template<typename MatrixType> class ScalarProduct
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{
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public:
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typedef typename MatrixType::Scalar Scalar;
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ScalarProduct(const MatrixType& matrix, Scalar scalar)
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: m_matrix(matrix), m_scalar(scalar) {}
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ScalarProduct(const ScalarProduct& other)
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: m_matrix(other.m_matrix), m_scalar(other.m_scalar) {}
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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 operator()(int row, int col) const
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{
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return m_matrix(row, col) * m_scalar;
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}
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protected:
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const MatrixType m_matrix;
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const Scalar m_scalar;
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};
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template<typename Content>
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const MatrixConstXpr<
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const ScalarProduct<
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MatrixConstXpr<Content>
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>
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>
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operator *(const MatrixConstXpr<Content>& xpr,
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typename Content::Scalar scalar)
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{
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typedef const ScalarProduct<
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MatrixConstXpr<Content>
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> ProductType;
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typedef const MatrixConstXpr<ProductType> XprType;
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return XprType(ProductType(xpr, scalar));
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}
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template<typename Content>
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const MatrixConstXpr<
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const ScalarProduct<
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MatrixConstXpr<Content>
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>
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>
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operator *(typename Content::Scalar scalar,
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const MatrixConstXpr<Content>& xpr)
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{
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typedef const ScalarProduct<
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MatrixConstXpr<Content>
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> ProductType;
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typedef const MatrixConstXpr<ProductType> XprType;
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return XprType(ProductType(xpr, scalar));
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}
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template<typename Derived>
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const MatrixConstXpr<
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const ScalarProduct<
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MatrixConstRef<MatrixBase<Derived> >
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>
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>
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operator *(const MatrixBase<Derived>& matrix,
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typename Derived::Scalar scalar)
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{
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typedef const ScalarProduct<
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MatrixConstRef<MatrixBase<Derived> >
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> ProductType;
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typedef const MatrixConstXpr<ProductType> XprType;
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return XprType(ProductType(matrix.constRef(), scalar));
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}
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template<typename Derived>
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const MatrixConstXpr<
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const ScalarProduct<
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MatrixConstRef<MatrixBase<Derived> >
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>
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>
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operator *(typename Derived::Scalar scalar,
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const MatrixBase<Derived>& matrix)
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{
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typedef const ScalarProduct<
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MatrixConstRef<MatrixBase<Derived> >
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> ProductType;
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typedef const MatrixConstXpr<ProductType> XprType;
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return XprType(ProductType(matrix.constRef(), scalar));
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}
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} // namespace Eigen
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#endif // EIGEN_SCALAROPS_H
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