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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 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_SPARSE_REF_H
#define EIGEN_SPARSE_REF_H
namespace Eigen {
enum {
StandardCompressedFormat = 2
};
namespace internal {
template<typename Derived> class SparseRefBase;
template<typename MatScalar, int MatOptions, typename MatIndex, int _Options, typename _StrideType>
struct traits<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, _Options, _StrideType> >
: public traits<SparseMatrix<MatScalar,MatOptions,MatIndex> >
{
typedef SparseMatrix<MatScalar,MatOptions,MatIndex> PlainObjectType;
enum {
Options = _Options,
Flags = traits<SparseMatrix<MatScalar,MatOptions,MatIndex> >::Flags | CompressedAccessBit | NestByRefBit
};
template<typename Derived> struct match {
enum {
StorageOrderMatch = PlainObjectType::IsVectorAtCompileTime || Derived::IsVectorAtCompileTime || ((PlainObjectType::Flags&RowMajorBit)==(Derived::Flags&RowMajorBit)),
MatchAtCompileTime = (Derived::Flags&CompressedAccessBit) && StorageOrderMatch
};
typedef typename internal::conditional<MatchAtCompileTime,internal::true_type,internal::false_type>::type type;
};
};
template<typename MatScalar, int MatOptions, typename MatIndex, int _Options, typename _StrideType>
struct traits<Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, _Options, _StrideType> >
: public traits<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, _Options, _StrideType> >
{
enum {
Flags = (traits<SparseMatrix<MatScalar,MatOptions,MatIndex> >::Flags | CompressedAccessBit | NestByRefBit) & ~LvalueBit
};
};
template<typename Derived>
struct traits<SparseRefBase<Derived> > : public traits<Derived> {};
template<typename Derived> class SparseRefBase
: public SparseMapBase<Derived>
{
public:
typedef SparseMapBase<Derived> Base;
_EIGEN_SPARSE_PUBLIC_INTERFACE(SparseRefBase)
SparseRefBase()
: Base(RowsAtCompileTime==Dynamic?0:RowsAtCompileTime,ColsAtCompileTime==Dynamic?0:ColsAtCompileTime, 0, 0, 0, 0, 0)
{}
protected:
template<typename Expression>
void construct(Expression& expr)
{
::new (static_cast<Base*>(this)) Base(expr.rows(), expr.cols(), expr.nonZeros(), expr.outerIndexPtr(), expr.innerIndexPtr(), expr.valuePtr(), expr.innerNonZeroPtr());
}
};
} // namespace internal
/**
* \ingroup Sparse_Module
*
* \brief A sparse matrix expression referencing an existing sparse expression
*
* \tparam PlainObjectType the equivalent sparse matrix type of the referenced data
* \tparam Options specifies whether the a standard compressed format is required \c Options is \c #StandardCompressedFormat, or \c 0.
* The default is \c 0.
* \tparam StrideType Only used for dense Ref
*
* \sa class Ref
*/
template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
class Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType >
: public internal::SparseRefBase<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType > >
{
typedef SparseMatrix<MatScalar,MatOptions,MatIndex> PlainObjectType;
typedef internal::traits<Ref> Traits;
template<int OtherOptions>
inline Ref(const SparseMatrix<MatScalar,OtherOptions,MatIndex>& expr);
template<int OtherOptions>
inline Ref(const MappedSparseMatrix<MatScalar,OtherOptions,MatIndex>& expr);
public:
typedef internal::SparseRefBase<Ref> Base;
_EIGEN_SPARSE_PUBLIC_INTERFACE(Ref)
#ifndef EIGEN_PARSED_BY_DOXYGEN
template<int OtherOptions>
inline Ref(SparseMatrix<MatScalar,OtherOptions,MatIndex>& expr)
{
EIGEN_STATIC_ASSERT(bool(Traits::template match<SparseMatrix<MatScalar,OtherOptions,MatIndex> >::MatchAtCompileTime), STORAGE_LAYOUT_DOES_NOT_MATCH);
eigen_assert( ((Options & int(StandardCompressedFormat))==0) || (expr.isCompressed()) );
Base::construct(expr.derived());
}
template<int OtherOptions>
inline Ref(MappedSparseMatrix<MatScalar,OtherOptions,MatIndex>& expr)
{
EIGEN_STATIC_ASSERT(bool(Traits::template match<SparseMatrix<MatScalar,OtherOptions,MatIndex> >::MatchAtCompileTime), STORAGE_LAYOUT_DOES_NOT_MATCH);
eigen_assert( ((Options & int(StandardCompressedFormat))==0) || (expr.isCompressed()) );
Base::construct(expr.derived());
}
template<typename Derived>
inline Ref(const SparseCompressedBase<Derived>& expr)
#else
template<typename Derived>
inline Ref(SparseCompressedBase<Derived>& expr)
#endif
{
EIGEN_STATIC_ASSERT(bool(internal::is_lvalue<Derived>::value), THIS_EXPRESSION_IS_NOT_A_LVALUE__IT_IS_READ_ONLY);
EIGEN_STATIC_ASSERT(bool(Traits::template match<Derived>::MatchAtCompileTime), STORAGE_LAYOUT_DOES_NOT_MATCH);
eigen_assert( ((Options & int(StandardCompressedFormat))==0) || (expr.isCompressed()) );
Base::construct(expr.const_cast_derived());
}
};
// this is the const ref version
template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
class Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType>
: public internal::SparseRefBase<Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> >
{
typedef SparseMatrix<MatScalar,MatOptions,MatIndex> TPlainObjectType;
typedef internal::traits<Ref> Traits;
public:
typedef internal::SparseRefBase<Ref> Base;
_EIGEN_SPARSE_PUBLIC_INTERFACE(Ref)
template<typename Derived>
inline Ref(const SparseMatrixBase<Derived>& expr)
{
construct(expr.derived(), typename Traits::template match<Derived>::type());
}
inline Ref(const Ref& other) : Base(other) {
// copy constructor shall not copy the m_object, to avoid unnecessary malloc and copy
}
template<typename OtherRef>
inline Ref(const RefBase<OtherRef>& other) {
construct(other.derived(), typename Traits::template match<OtherRef>::type());
}
protected:
template<typename Expression>
void construct(const Expression& expr,internal::true_type)
{
if((Options & int(StandardCompressedFormat)) && (!expr.isCompressed()))
{
m_object = expr;
Base::construct(m_object);
}
else
{
Base::construct(expr);
}
}
template<typename Expression>
void construct(const Expression& expr, internal::false_type)
{
m_object = expr;
Base::construct(m_object);
}
protected:
TPlainObjectType m_object;
};
namespace internal {
template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
struct evaluator<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> >
: evaluator<SparseCompressedBase<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> > >
{
typedef evaluator<SparseCompressedBase<Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> > > Base;
typedef Ref<SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> XprType;
evaluator() : Base() {}
explicit evaluator(const XprType &mat) : Base(mat) {}
};
template<typename MatScalar, int MatOptions, typename MatIndex, int Options, typename StrideType>
struct evaluator<Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> >
: evaluator<SparseCompressedBase<Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> > >
{
typedef evaluator<SparseCompressedBase<Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> > > Base;
typedef Ref<const SparseMatrix<MatScalar,MatOptions,MatIndex>, Options, StrideType> XprType;
evaluator() : Base() {}
explicit evaluator(const XprType &mat) : Base(mat) {}
};
}
} // end namespace Eigen
#endif // EIGEN_SPARSE_REF_H
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