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98 lines (77 loc) · 2.5 KB
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// -*- c++ -*-
/*
* Copyright (c) 2010-2012, Jim Bosch
* All rights reserved.
*
* ndarray is distributed under a simple BSD-like license;
* see the LICENSE file that should be present in the root
* of the source distribution, or alternately available at:
* https://github.com/ndarray/ndarray
*/
#ifndef NDARRAY_DETAIL_StridedIterator_h_INCLUDED
#define NDARRAY_DETAIL_StridedIterator_h_INCLUDED
/**
* @file ndarray/detail/StridedIterator.h
*
* @brief Definition of StridedIterator.
*/
#include "ndarray_fwd.h"
#include <boost/iterator/iterator_facade.hpp>
namespace ndarray {
namespace detail {
/**
* @internal @brief Strided iterator for noncontiguous 1D arrays.
*
* @ingroup ndarrayInternalGroup
*/
template <typename T>
class StridedIterator : public boost::iterator_facade<
StridedIterator<T>,
T, boost::random_access_traversal_tag
>
{
public:
typedef T Value;
typedef T & Reference;
StridedIterator() : _data(0), _stride(0) {}
StridedIterator(T * data, Offset stride) : _data(data), _stride(stride) {}
StridedIterator(StridedIterator const & other) : _data(other._data), _stride(other._stride) {}
template <typename U>
StridedIterator(StridedIterator<U> const & other) : _data(other._data), _stride(other._stride) {
BOOST_STATIC_ASSERT((boost::is_convertible<U*,T*>::value));
}
StridedIterator & operator=(StridedIterator const & other) {
if (&other != this) {
_data = other._data;
_stride = other._stride;
}
return *this;
}
template <typename U>
StridedIterator & operator=(StridedIterator<U> const & other) {
BOOST_STATIC_ASSERT((boost::is_convertible<U*,T*>::value));
_data = other._data;
_stride = other._stride;
return *this;
}
private:
friend class boost::iterator_core_access;
template <typename OtherT> friend class StridedIterator;
Reference dereference() const { return *_data; }
void increment() { _data += _stride; }
void decrement() { _data -= _stride; }
void advance(Offset n) { _data += _stride * n; }
template <typename U>
Offset distance_to(StridedIterator<U> const & other) const {
return std::distance(_data, other._data) / _stride;
}
template <typename U>
bool equal(StridedIterator<U> const & other) const {
return _data == other._data;
}
T * _data;
Offset _stride;
};
} // namespace detail
} // namespace ndarray
#endif // !NDARRAY_DETAIL_StridedIterator_h_INCLUDED