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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_SWAP_H
#define EIGEN_SWAP_H
template <typename Derived, typename OtherDerived, bool IsVector = Derived::IsVectorAtCompileTime>
struct ei_swap_selector;
/** swaps *this with the expression \a other.
*
* \note \a other is only marked const because I couln't find another way
* to get g++ (4.2 and 4.3) to accept that template parameter resolution.
* The problem seems to be that when swapping expressions as in
* m.row(i).swap(m.row(j)); the Row object returned by row(j) is a temporary
* and g++ doesn't dare to pass it by non-constant reference.
* It gets const_cast'd of course. TODO: get rid of const here.
*/
template<typename Derived>
template<typename OtherDerived>
void MatrixBase<Derived>::swap(const MatrixBase<OtherDerived>& other)
{
MatrixBase<OtherDerived> *_other = const_cast<MatrixBase<OtherDerived>*>(&other);
if(SizeAtCompileTime == Dynamic)
{
ei_swap_selector<Derived,OtherDerived>::run(derived(),other.const_cast_derived());
}
else // SizeAtCompileTime != Dynamic
{
typename Derived::Eval buf(*this);
*this = other;
*_other = buf;
}
}
template<typename Derived, typename OtherDerived>
struct ei_swap_selector<Derived,OtherDerived,true>
{
inline static void run(Derived& src, OtherDerived& other)
{
typename Derived::Scalar tmp;
ei_assert(OtherDerived::IsVectorAtCompileTime && src.size() == other.size());
for(int i = 0; i < src.size(); i++)
{
tmp = src.coeff(i);
src.coeffRef(i) = other.coeff(i);
other.coeffRef(i) = tmp;
}
}
};
template<typename Derived, typename OtherDerived>
struct ei_swap_selector<Derived,OtherDerived,false>
{
inline void run(Derived& src, OtherDerived& other)
{
typename Derived::Scalar tmp;
for(int j = 0; j < src.cols(); j++)
for(int i = 0; i < src.rows(); i++)
{
tmp = src.coeff(i, j);
src.coeffRef(i, j) = other.coeff(i, j);
other.coeffRef(i, j) = tmp;
}
}
};
#endif // EIGEN_SWAP_H
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