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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2011 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2010 Daniel Lowengrub <lowdanie@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_SPARSEVIEW_H
#define EIGEN_SPARSEVIEW_H
namespace Eigen {
namespace internal {
template<typename MatrixType>
struct traits<SparseView<MatrixType> > : traits<MatrixType>
{
typedef typename MatrixType::Index Index;
typedef Sparse StorageKind;
enum {
Flags = int(traits<MatrixType>::Flags) & (RowMajorBit)
};
};
} // end namespace internal
template<typename MatrixType>
class SparseView : public SparseMatrixBase<SparseView<MatrixType> >
{
typedef typename MatrixType::Nested MatrixTypeNested;
typedef typename internal::remove_all<MatrixTypeNested>::type _MatrixTypeNested;
public:
EIGEN_SPARSE_PUBLIC_INTERFACE(SparseView)
SparseView(const MatrixType& mat, const Scalar& m_reference = Scalar(0),
typename NumTraits<Scalar>::Real m_epsilon = NumTraits<Scalar>::dummy_precision()) :
m_matrix(mat), m_reference(m_reference), m_epsilon(m_epsilon) {}
class InnerIterator;
inline Index rows() const { return m_matrix.rows(); }
inline Index cols() const { return m_matrix.cols(); }
inline Index innerSize() const { return m_matrix.innerSize(); }
inline Index outerSize() const { return m_matrix.outerSize(); }
protected:
MatrixTypeNested m_matrix;
Scalar m_reference;
typename NumTraits<Scalar>::Real m_epsilon;
};
template<typename MatrixType>
class SparseView<MatrixType>::InnerIterator : public _MatrixTypeNested::InnerIterator
{
typedef typename SparseView::Index Index;
public:
typedef typename _MatrixTypeNested::InnerIterator IterBase;
InnerIterator(const SparseView& view, Index outer) :
IterBase(view.m_matrix, outer), m_view(view)
{
incrementToNonZero();
}
EIGEN_STRONG_INLINE InnerIterator& operator++()
{
IterBase::operator++();
incrementToNonZero();
return *this;
}
using IterBase::value;
protected:
const SparseView& m_view;
private:
void incrementToNonZero()
{
while((bool(*this)) && internal::isMuchSmallerThan(value(), m_view.m_reference, m_view.m_epsilon))
{
IterBase::operator++();
}
}
};
template<typename Derived>
const SparseView<Derived> MatrixBase<Derived>::sparseView(const Scalar& m_reference,
const typename NumTraits<Scalar>::Real& m_epsilon) const
{
return SparseView<Derived>(derived(), m_reference, m_epsilon);
}
} // end namespace Eigen
#endif
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