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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) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, 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 of
// the License, 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 Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_SUM_H
#define EIGEN_SUM_H
/** \class Sum
*
* \brief Expression of the sum of two matrices or vectors
*
* \param Lhs the type of the left-hand side
* \param Rhs the type of the right-hand side
*
* This class represents an expression of the sum of two matrices or vectors.
* It is the return type of the operator+ between matrices or vectors, and most
* of the time this is the only way it is used.
*
* \sa class Difference
*/
template<typename Lhs, typename Rhs> class Sum : NoOperatorEquals,
public MatrixBase<typename Lhs::Scalar, Sum<Lhs, Rhs> >
{
public:
typedef typename Lhs::Scalar Scalar;
typedef typename Lhs::Ref LhsRef;
typedef typename Rhs::Ref RhsRef;
friend class MatrixBase<Scalar, Sum>;
typedef MatrixBase<Scalar, Sum> Base;
Sum(const LhsRef& lhs, const RhsRef& rhs)
: m_lhs(lhs), m_rhs(rhs)
{
assert(lhs.rows() == rhs.rows() && lhs.cols() == rhs.cols());
}
private:
enum {
RowsAtCompileTime = Lhs::Traits::RowsAtCompileTime,
ColsAtCompileTime = Lhs::Traits::ColsAtCompileTime,
MaxRowsAtCompileTime = Lhs::Traits::MaxRowsAtCompileTime,
MaxColsAtCompileTime = Lhs::Traits::MaxColsAtCompileTime
};
const Sum& _ref() const { return *this; }
int _rows() const { return m_lhs.rows(); }
int _cols() const { return m_lhs.cols(); }
Scalar _coeff(int row, int col) const
{
return m_lhs.coeff(row, col) + m_rhs.coeff(row, col);
}
protected:
const LhsRef m_lhs;
const RhsRef m_rhs;
};
/** \relates MatrixBase
*
* \returns an expression of the sum of \a mat1 and \a mat2
*
* \sa class Sum, MatrixBase::operator+=()
*/
template<typename Scalar, typename Derived1, typename Derived2>
const Sum<Derived1, Derived2>
operator+(const MatrixBase<Scalar, Derived1> &mat1, const MatrixBase<Scalar, Derived2> &mat2)
{
return Sum<Derived1, Derived2>(mat1.ref(), mat2.ref());
}
/** replaces \c *this by \c *this + \a other.
*
* \returns a reference to \c *this
*/
template<typename Scalar, typename Derived>
template<typename OtherDerived>
Derived &
MatrixBase<Scalar, Derived>::operator+=(const MatrixBase<Scalar, OtherDerived>& other)
{
return *this = *this + other;
}
#endif // EIGEN_SUM_H
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