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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2010 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_DENSEDIRECTACCESSBASE_H
#define EIGEN_DENSEDIRECTACCESSBASE_H
template<typename Derived> struct ei_has_direct_access
{
enum { ret = (ei_traits<Derived>::Flags & DirectAccessBit) ? 1 : 0 };
};
template<typename Derived, bool _HasDirectAccess = ei_has_direct_access<Derived>::ret>
struct ei_inner_stride_at_compile_time
{
enum { ret = ei_traits<Derived>::InnerStrideAtCompileTime };
};
template<typename Derived>
struct ei_inner_stride_at_compile_time<Derived, false>
{
enum { ret = 0 };
};
template<typename Derived, bool _HasDirectAccess = ei_has_direct_access<Derived>::ret>
struct ei_outer_stride_at_compile_time
{
enum { ret = ei_traits<Derived>::OuterStrideAtCompileTime };
};
template<typename Derived>
struct ei_outer_stride_at_compile_time<Derived, false>
{
enum { ret = 0 };
};
template<typename Derived, typename XprKind = typename ei_traits<Derived>::XprKind>
struct ei_dense_xpr_base
{
/* ei_dense_xpr_base should only ever be used on dense expressions, thus falling either into the MatrixXpr or into the ArrayXpr cases */
};
template<typename Derived>
struct ei_dense_xpr_base<Derived, MatrixXpr>
{
typedef MatrixBase<Derived> type;
};
template<typename Derived>
struct ei_dense_xpr_base<Derived, ArrayXpr>
{
typedef ArrayBase<Derived> type;
};
template<typename Derived> class DenseDirectAccessBase
: public ei_dense_xpr_base<Derived>::type
{
public:
typedef typename ei_dense_xpr_base<Derived>::type Base;
using Base::IsVectorAtCompileTime;
using Base::IsRowMajor;
using Base::derived;
using Base::operator=;
typedef typename Base::CoeffReturnType CoeffReturnType;
enum {
InnerStrideAtCompileTime = ei_traits<Derived>::InnerStrideAtCompileTime,
OuterStrideAtCompileTime = ei_traits<Derived>::OuterStrideAtCompileTime
};
/** \returns the pointer increment between two consecutive elements within a slice in the inner direction.
*
* \sa outerStride(), rowStride(), colStride()
*/
inline int innerStride() const
{
return derived().innerStride();
}
/** \returns the pointer increment between two consecutive inner slices (for example, between two consecutive columns
* in a column-major matrix).
*
* \sa innerStride(), rowStride(), colStride()
*/
inline int outerStride() const
{
return derived().outerStride();
}
inline int stride() const
{
return IsVectorAtCompileTime ? innerStride() : outerStride();
}
/** \returns the pointer increment between two consecutive rows.
*
* \sa innerStride(), outerStride(), colStride()
*/
inline int rowStride() const
{
return IsRowMajor ? outerStride() : innerStride();
}
/** \returns the pointer increment between two consecutive columns.
*
* \sa innerStride(), outerStride(), rowStride()
*/
inline int colStride() const
{
return IsRowMajor ? innerStride() : outerStride();
}
};
#endif // EIGEN_DENSEDIRECTACCESSBASE_H
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