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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008-2014 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// 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_SPARSETRANSPOSE_H
#define EIGEN_SPARSETRANSPOSE_H
namespace Eigen {
// Implement nonZeros() for transpose. I'm not sure that's the best approach for that.
// Perhaps it should be implemented in Transpose<> itself.
template<typename MatrixType> class TransposeImpl<MatrixType,Sparse>
: public SparseMatrixBase<Transpose<MatrixType> >
{
protected:
typedef SparseMatrixBase<Transpose<MatrixType> > Base;
public:
inline typename MatrixType::Index nonZeros() const { return Base::derived().nestedExpression().nonZeros(); }
};
namespace internal {
template<typename ArgType>
struct unary_evaluator<Transpose<ArgType>, IteratorBased>
: public evaluator_base<Transpose<ArgType> >
{
typedef typename evaluator<ArgType>::InnerIterator EvalIterator;
typedef typename evaluator<ArgType>::ReverseInnerIterator EvalReverseIterator;
public:
typedef Transpose<ArgType> XprType;
typedef typename XprType::Index Index;
class InnerIterator : public EvalIterator
{
public:
EIGEN_STRONG_INLINE InnerIterator(const unary_evaluator& unaryOp, typename XprType::Index outer)
: EvalIterator(unaryOp.m_argImpl,outer)
{}
Index row() const { return EvalIterator::col(); }
Index col() const { return EvalIterator::row(); }
};
class ReverseInnerIterator : public EvalReverseIterator
{
public:
EIGEN_STRONG_INLINE ReverseInnerIterator(const unary_evaluator& unaryOp, typename XprType::Index outer)
: EvalReverseIterator(unaryOp.m_argImpl,outer)
{}
Index row() const { return EvalReverseIterator::col(); }
Index col() const { return EvalReverseIterator::row(); }
};
enum {
CoeffReadCost = evaluator<ArgType>::CoeffReadCost,
Flags = XprType::Flags
};
explicit unary_evaluator(const XprType& op) :m_argImpl(op.nestedExpression()) {}
protected:
typename evaluator<ArgType>::nestedType m_argImpl;
};
} // end namespace internal
} // end namespace Eigen
#endif // EIGEN_SPARSETRANSPOSE_H
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