// This file is part of Eigen, a lightweight C++ template library // for linear algebra. // // Copyright (C) 2010 Benoit Jacob <jacob.benoit.1@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_STRIDE_H #define EIGEN_STRIDE_H
namespace Eigen {
/** \class Stride * \ingroup Core_Module * * \brief Holds strides information for Map * * This class holds the strides information for mapping arrays with strides with class Map. * * It holds two values: the inner stride and the outer stride. * * The inner stride is the pointer increment between two consecutive entries within a given row of a * row-major matrix or within a given column of a column-major matrix. * * The outer stride is the pointer increment between two consecutive rows of a row-major matrix or * between two consecutive columns of a column-major matrix. * * These two values can be passed either at compile-time as template parameters, or at runtime as * arguments to the constructor. * * Indeed, this class takes two template parameters: * \tparam _OuterStrideAtCompileTime the outer stride, or Dynamic if you want to specify it at runtime. * \tparam _InnerStrideAtCompileTime the inner stride, or Dynamic if you want to specify it at runtime. * * Here is an example: * \include Map_general_stride.cpp * Output: \verbinclude Map_general_stride.out * * Both strides can be negative, however, a negative stride of -1 cannot be specified at compiletime * because of the ambiguity with Dynamic which is defined to -1 (historically, negative strides were * not allowed). * * \sa class InnerStride, class OuterStride, \ref TopicStorageOrders
*/ template<int _OuterStrideAtCompileTime, int _InnerStrideAtCompileTime> class Stride
{ public: typedef Eigen::Index Index; ///< \deprecated since Eigen 3.3 enum {
InnerStrideAtCompileTime = _InnerStrideAtCompileTime,
OuterStrideAtCompileTime = _OuterStrideAtCompileTime
};
/** Default constructor, for use when strides are fixed at compile time */
EIGEN_DEVICE_FUNC
Stride()
: m_outer(OuterStrideAtCompileTime), m_inner(InnerStrideAtCompileTime)
{ // FIXME: for Eigen 4 we should use DynamicIndex instead of Dynamic. // FIXME: for Eigen 4 we should also unify this API with fix<>
eigen_assert(InnerStrideAtCompileTime != Dynamic && OuterStrideAtCompileTime != Dynamic);
}
/** Constructor allowing to pass the strides at runtime */
EIGEN_DEVICE_FUNC
Stride(Index outerStride, Index innerStride)
: m_outer(outerStride), m_inner(innerStride)
{
}
/** \brief Convenience specialization of Stride to specify only an inner stride
* See class Map for some examples */ template<int Value> class InnerStride : public Stride<0, Value>
{ typedef Stride<0, Value> Base; public:
EIGEN_DEVICE_FUNC InnerStride() : Base() {}
EIGEN_DEVICE_FUNC InnerStride(Index v) : Base(0, v) {} // FIXME making this explicit could break valid code
};
/** \brief Convenience specialization of Stride to specify only an outer stride
* See class Map for some examples */ template<int Value> class OuterStride : public Stride<Value, 0>
{ typedef Stride<Value, 0> Base; public:
EIGEN_DEVICE_FUNC OuterStride() : Base() {}
EIGEN_DEVICE_FUNC OuterStride(Index v) : Base(v,0) {} // FIXME making this explicit could break valid code
};
} // end namespace Eigen
#endif// EIGEN_STRIDE_H
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