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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.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_SPARSE_TRIANGULARVIEW_H
#define EIGEN_SPARSE_TRIANGULARVIEW_H
namespace Eigen {
namespace internal {
template<typename MatrixType, int Mode>
struct traits<SparseTriangularView<MatrixType,Mode> >
: public traits<MatrixType>
{};
} // namespace internal
template<typename MatrixType, int Mode> class SparseTriangularView
: public SparseMatrixBase<SparseTriangularView<MatrixType,Mode> >
{
enum { SkipFirst = ((Mode&Lower) && !(MatrixType::Flags&RowMajorBit))
|| ((Mode&Upper) && (MatrixType::Flags&RowMajorBit)),
SkipLast = !SkipFirst,
HasUnitDiag = (Mode&UnitDiag) ? 1 : 0
};
public:
EIGEN_SPARSE_PUBLIC_INTERFACE(SparseTriangularView)
class InnerIterator;
class ReverseInnerIterator;
inline Index rows() const { return m_matrix.rows(); }
inline Index cols() const { return m_matrix.cols(); }
typedef typename MatrixType::Nested MatrixTypeNested;
typedef typename internal::remove_reference<MatrixTypeNested>::type MatrixTypeNestedNonRef;
typedef typename internal::remove_all<MatrixTypeNested>::type MatrixTypeNestedCleaned;
inline SparseTriangularView(const MatrixType& matrix) : m_matrix(matrix) {}
/** \internal */
inline const MatrixTypeNestedCleaned& nestedExpression() const { return m_matrix; }
template<typename OtherDerived>
typename internal::plain_matrix_type_column_major<OtherDerived>::type
solve(const MatrixBase<OtherDerived>& other) const;
template<typename OtherDerived> void solveInPlace(MatrixBase<OtherDerived>& other) const;
template<typename OtherDerived> void solveInPlace(SparseMatrixBase<OtherDerived>& other) const;
protected:
MatrixTypeNested m_matrix;
};
template<typename MatrixType, int Mode>
class SparseTriangularView<MatrixType,Mode>::InnerIterator : public MatrixTypeNestedCleaned::InnerIterator
{
typedef typename MatrixTypeNestedCleaned::InnerIterator Base;
public:
EIGEN_STRONG_INLINE InnerIterator(const SparseTriangularView& view, Index outer)
: Base(view.nestedExpression(), outer), m_returnOne(false)
{
if(SkipFirst)
{
while((*this) && (HasUnitDiag ? this->index()<=outer : this->index()<outer))
Base::operator++();
if(HasUnitDiag)
m_returnOne = true;
}
else if(HasUnitDiag && ((!Base::operator bool()) || Base::index()>=Base::outer()))
{
if((!SkipFirst) && Base::operator bool())
Base::operator++();
m_returnOne = true;
}
}
EIGEN_STRONG_INLINE InnerIterator& operator++()
{
if(HasUnitDiag && m_returnOne)
m_returnOne = false;
else
{
Base::operator++();
if(HasUnitDiag && (!SkipFirst) && ((!Base::operator bool()) || Base::index()>=Base::outer()))
{
if((!SkipFirst) && Base::operator bool())
Base::operator++();
m_returnOne = true;
}
}
return *this;
}
inline Index row() const { return Base::row(); }
inline Index col() const { return Base::col(); }
inline Index index() const
{
if(HasUnitDiag && m_returnOne) return Base::outer();
else return Base::index();
}
inline Scalar value() const
{
if(HasUnitDiag && m_returnOne) return Scalar(1);
else return Base::value();
}
EIGEN_STRONG_INLINE operator bool() const
{
if(HasUnitDiag && m_returnOne)
return true;
return (SkipFirst ? Base::operator bool() : (Base::operator bool() && this->index() <= this->outer()));
}
protected:
bool m_returnOne;
};
template<typename MatrixType, int Mode>
class SparseTriangularView<MatrixType,Mode>::ReverseInnerIterator : public MatrixTypeNestedCleaned::ReverseInnerIterator
{
typedef typename MatrixTypeNestedCleaned::ReverseInnerIterator Base;
public:
EIGEN_STRONG_INLINE ReverseInnerIterator(const SparseTriangularView& view, Index outer)
: Base(view.nestedExpression(), outer)
{
eigen_assert((!HasUnitDiag) && "ReverseInnerIterator does not support yet triangular views with a unit diagonal");
if(SkipLast)
while((*this) && this->index()>outer)
--(*this);
}
EIGEN_STRONG_INLINE InnerIterator& operator--()
{ Base::operator--(); return *this; }
inline Index row() const { return Base::row(); }
inline Index col() const { return Base::col(); }
EIGEN_STRONG_INLINE operator bool() const
{
return SkipLast ? Base::operator bool() : (Base::operator bool() && this->index() >= this->outer());
}
};
template<typename Derived>
template<int Mode>
inline const SparseTriangularView<Derived, Mode>
SparseMatrixBase<Derived>::triangularView() const
{
return derived();
}
} // end namespace Eigen
#endif // EIGEN_SPARSE_TRIANGULARVIEW_H
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