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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) 2008 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// 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_XPRHELPER_H
#define EIGEN_XPRHELPER_H
// just a workaround because GCC seems to not really like empty structs
#ifdef __GNUG__
struct ei_empty_struct{char _ei_dummy_;};
#define EIGEN_EMPTY_STRUCT : Eigen::ei_empty_struct
#else
#define EIGEN_EMPTY_STRUCT
#endif
//classes inheriting ei_no_assignment_operator don't generate a default operator=.
class ei_no_assignment_operator
{
private:
ei_no_assignment_operator& operator=(const ei_no_assignment_operator&);
};
template<int Value> class ei_int_if_dynamic EIGEN_EMPTY_STRUCT
{
public:
ei_int_if_dynamic() {}
explicit ei_int_if_dynamic(int) {}
static int value() { return Value; }
void setValue(int) {}
};
template<> class ei_int_if_dynamic<Dynamic>
{
int m_value;
ei_int_if_dynamic() {}
public:
explicit ei_int_if_dynamic(int value) : m_value(value) {}
int value() const { return m_value; }
void setValue(int value) { m_value = value; }
};
template<typename T> struct ei_functor_traits
{
enum
{
Cost = 10,
PacketAccess = false
};
};
template<typename T> struct ei_packet_traits
{
typedef T type;
enum {size=1};
};
template<typename T> struct ei_unpacket_traits
{
typedef T type;
enum {size=1};
};
template<typename Scalar, int Rows, int Cols, int StorageOrder, int MaxRows, int MaxCols>
class ei_compute_matrix_flags
{
enum {
row_major_bit = (Rows != 1 && Cols != 1) // if this is not a vector,
// then the storage order really matters,
// so let us strictly honor the user's choice.
? StorageOrder
: Cols > 1 ? RowMajorBit : 0,
inner_max_size = row_major_bit ? MaxCols : MaxRows,
is_big = inner_max_size == Dynamic,
is_packet_size_multiple = (Cols * Rows)%ei_packet_traits<Scalar>::size==0,
packet_access_bit = ei_packet_traits<Scalar>::size > 1
&& (is_big || is_packet_size_multiple) ? PacketAccessBit : 0,
aligned_bit = packet_access_bit && (is_big || is_packet_size_multiple) ? AlignedBit : 0
};
public:
enum { ret = LinearAccessBit | DirectAccessBit | packet_access_bit | row_major_bit | aligned_bit };
};
template<int _Rows, int _Cols> struct ei_size_at_compile_time
{
enum { ret = (_Rows==Dynamic || _Cols==Dynamic) ? Dynamic : _Rows * _Cols };
};
template<typename T, int Sparseness = ei_traits<T>::Flags&SparseBit> class ei_eval;
template<typename T> struct ei_eval<T,IsDense>
{
typedef Matrix<typename ei_traits<T>::Scalar,
ei_traits<T>::RowsAtCompileTime,
ei_traits<T>::ColsAtCompileTime,
ei_traits<T>::Flags&RowMajorBit ? RowMajor : ColMajor,
ei_traits<T>::MaxRowsAtCompileTime,
ei_traits<T>::MaxColsAtCompileTime
> type;
};
template<typename T> struct ei_eval_to_column_major
{
typedef Matrix<typename ei_traits<T>::Scalar,
ei_traits<T>::RowsAtCompileTime,
ei_traits<T>::ColsAtCompileTime,
ColMajor,
ei_traits<T>::MaxRowsAtCompileTime,
ei_traits<T>::MaxColsAtCompileTime
> type;
};
template<typename T> struct ei_must_nest_by_value { enum { ret = false }; };
template<typename T> struct ei_must_nest_by_value<NestByValue<T> > { enum { ret = true }; };
template<typename T, int n=1, typename EvalType = typename ei_eval<T>::type> struct ei_nested
{
enum {
CostEval = (n+1) * int(NumTraits<typename ei_traits<T>::Scalar>::ReadCost),
CostNoEval = (n-1) * int(ei_traits<T>::CoeffReadCost)
};
typedef typename ei_meta_if<
ei_must_nest_by_value<T>::ret,
T,
typename ei_meta_if<
(int(ei_traits<T>::Flags) & EvalBeforeNestingBit)
|| ( int(CostEval) <= int(CostNoEval) ),
EvalType,
const T&
>::ret
>::ret type;
};
template<unsigned int Flags> struct ei_are_flags_consistent
{
enum { ret = !( (Flags&UnitDiagBit && Flags&ZeroDiagBit) )
};
};
/** \internal Gives the type of a sub-matrix or sub-vector of a matrix of type \a ExpressionType and size \a Size
* TODO: could be a good idea to define a big ReturnType struct ??
*/
template<typename ExpressionType, int RowsOrSize=Dynamic, int Cols=Dynamic> struct BlockReturnType {
typedef Block<ExpressionType, (ei_traits<ExpressionType>::RowsAtCompileTime == 1 ? 1 : RowsOrSize),
(ei_traits<ExpressionType>::ColsAtCompileTime == 1 ? 1 : RowsOrSize)> SubVectorType;
typedef Block<ExpressionType, RowsOrSize, Cols> Type;
};
template<typename CurrentType, typename NewType> struct ei_cast_return_type
{
typedef typename ei_meta_if<ei_is_same_type<CurrentType,NewType>::ret,const CurrentType&,NewType>::ret type;
};
#endif // EIGEN_XPRHELPER_H
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