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/* */
/* Copyright 2003-2012 by Gunnar Kedenburg and Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* ( Version 1.3.0, Sep 10 2004 ) */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
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/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
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/* */
/************************************************************************/
#ifndef VIGRA_MULTI_ITERATOR_HXX
#define VIGRA_MULTI_ITERATOR_HXX
#include <sys/types.h>
#include "multi_fwd.hxx"
#include "iteratortags.hxx"
#include "multi_iterator_coupled.hxx"
namespace vigra {
/** \addtogroup MultiIteratorGroup
*/
//@{
/** \brief Iterate over a virtual array where each element contains its coordinate.
MultiCoordinateIterator behaves like a read-only random access iterator.
It moves accross the given region of interest in scan-order (with the first
index changing most rapidly), and dereferencing the iterator returns the
coordinate (i.e. multi-dimensional index) of the current array element.
The functionality is thus similar to a meshgrid in Matlab or numpy.
Internally, it is just a wrapper of a \ref CoupledScanOrderIterator that
has been created without any array and whose reference type is not a
\ref CoupledHandle, but the coordinate itself.
The iterator supports all functions listed in the STL documentation for
<a href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">Random Access Iterators</a>.
<b>Usage:</b>
<b>\#include</b> \<vigra/multi_iterator.hxx\><br/>
Namespace: vigra
\code
MultiCoordinateIterator<3> i(Shape3(3,2,1)), end = i.getEndIterator();
for(; i != end; ++i)
std::cout << *i << "\n";
// Output:
// (0, 0, 0)
// (1, 0, 0)
// (2, 0, 0)
// (0, 1, 0)
// (1, 1, 0)
// (2, 1, 0)
\endcode
*/
template<unsigned int N>
class MultiCoordinateIterator
: public CoupledScanOrderIterator<N>
{
public:
typedef CoupledScanOrderIterator<N> base_type;
typedef typename base_type::shape_type shape_type;
typedef typename base_type::difference_type difference_type;
typedef MultiCoordinateIterator iterator;
typedef std::random_access_iterator_tag iterator_category;
typedef typename base_type::value_type handle_type;
typedef typename handle_type::value_type value_type;
typedef typename handle_type::reference reference;
typedef typename handle_type::const_reference const_reference;
typedef typename handle_type::pointer pointer;
typedef typename handle_type::const_pointer const_pointer;
MultiCoordinateIterator()
: base_type(handle_type())
{}
explicit MultiCoordinateIterator(shape_type const & shape)
: base_type(handle_type(shape))
{}
explicit MultiCoordinateIterator(shape_type const & start, shape_type const & end)
: base_type(handle_type(end))
{
this->restrictToSubarray(start, end);
}
template<class DirectedTag>
explicit MultiCoordinateIterator(GridGraph<N, DirectedTag> const & g)
: base_type(handle_type(g.shape()))
{}
template<class DirectedTag>
explicit MultiCoordinateIterator(GridGraph<N, DirectedTag> const & g, const typename GridGraph<N, DirectedTag>::Node & node)
: base_type(handle_type(g.shape()))
{
if( isInside(g,node))
(*this)+=node;
else
*this=this->getEndIterator();
}
// dereferencing the iterator yields the coordinate object
// (used as vertex_descriptor)
reference operator*()
{
return this->template get<0>();
}
const_reference operator*() const
{
return this->template get<0>();
}
operator value_type() const
{
return *(*this);
}
pointer operator->()
{
return &this->template get<0>();
}
const_pointer operator->() const
{
return &this->template get<0>();
}
value_type operator[](MultiArrayIndex i) const
{
return *(MultiCoordinateIterator(*this) += i);
}
MultiCoordinateIterator & operator++()
{
base_type::operator++();
return *this;
}
MultiCoordinateIterator operator++(int)
{
MultiCoordinateIterator res(*this);
++*this;
return res;
}
MultiCoordinateIterator & operator+=(MultiArrayIndex i)
{
base_type::operator+=(i);
return *this;
}
MultiCoordinateIterator & operator+=(const shape_type &coordOffset)
{
base_type::operator+=(coordOffset);
return *this;
}
MultiCoordinateIterator & operator--()
{
base_type::operator--();
return *this;
}
MultiCoordinateIterator operator--(int)
{
MultiCoordinateIterator res(*this);
--*this;
return res;
}
MultiCoordinateIterator & operator-=(MultiArrayIndex i)
{
return operator+=(-i);
}
MultiCoordinateIterator & operator-=(const shape_type &coordOffset)
{
return operator+=(-coordOffset);
}
MultiCoordinateIterator getEndIterator() const
{
return MultiCoordinateIterator(base_type::getEndIterator());
}
MultiCoordinateIterator operator+(MultiArrayIndex d) const
{
return MultiCoordinateIterator(*this) += d;
}
MultiCoordinateIterator operator-(MultiArrayIndex d) const
{
return MultiCoordinateIterator(*this) -= d;
}
MultiCoordinateIterator operator+(const shape_type &coordOffset) const
{
return MultiCoordinateIterator(*this) += coordOffset;
}
MultiCoordinateIterator operator-(const shape_type &coordOffset) const
{
return MultiCoordinateIterator(*this) -= coordOffset;
}
MultiArrayIndex operator-(const MultiCoordinateIterator & other) const
{
return base_type::operator-(other);
}
protected:
MultiCoordinateIterator(base_type const & base)
: base_type(base)
{}
};
/** \brief Sequential iterator for MultiArrayView.
This iterator provides STL-compatible random access iterator functionality for arbitrary
\ref MultiArrayView instances, regardless of their shapes and strides. The
class uses an implementation that minimizes speed penalties that could result from
non-trivial strides. The <i>scan-order</i> is defined such that dimensions are iterated
from front to back (first to last).
You normally construct instances of this class by calling \ref MultiArrayView::begin()
and \ref MultiArrayView::end().
The iterator supports all functions listed in the STL documentation for
<a href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">Random Access Iterators</a>.
<b>\#include</b> \<vigra/multi_iterator.hxx\><br/>
Namespace: vigra
*/
template <unsigned int N, class V, class REFERENCE, class POINTER>
class StridedScanOrderIterator
: public CoupledIteratorType<N, V>::type
{
public:
typedef typename CoupledIteratorType<N, V>::type base_type;
typedef typename base_type::value_type handle_type;
typedef typename base_type::shape_type shape_type;
typedef typename base_type::difference_type difference_type;
typedef StridedScanOrderIterator iterator;
typedef std::random_access_iterator_tag iterator_category;
typedef typename detail::ResolveChunkedMemory<V>::type T;
typedef T value_type;
typedef REFERENCE reference;
typedef T const & const_reference;
typedef POINTER pointer;
typedef T const * const_pointer;
StridedScanOrderIterator()
: base_type()
{}
template <class S>
explicit StridedScanOrderIterator(MultiArrayView<N, T, S> const & view)
: base_type(createCoupledIterator(view))
{}
StridedScanOrderIterator(POINTER p, shape_type const & shape, shape_type const & strides)
: base_type(createCoupledIterator(MultiArrayView<N, T, StridedArrayTag>(shape, strides, const_cast<T *>(p))))
{}
StridedScanOrderIterator(handle_type const & handle)
: base_type(handle)
{}
reference operator*()
{
return this->template get<1>();
}
const_reference operator*() const
{
return this->template get<1>();
}
pointer operator->()
{
return &this->template get<1>();
}
const_pointer operator->() const
{
return &this->template get<1>();
}
reference operator[](MultiArrayIndex i)
{
return *(StridedScanOrderIterator(*this) += i);
}
const_reference operator[](MultiArrayIndex i) const
{
return *(StridedScanOrderIterator(*this) += i);
}
reference operator[](const shape_type& coordOffset)
{
return *(StridedScanOrderIterator(*this) += coordOffset);
}
const_reference operator[](const shape_type& coordOffset) const
{
return *(StridedScanOrderIterator(*this) += coordOffset);
}
StridedScanOrderIterator & operator++()
{
base_type::operator++();
return *this;
}
StridedScanOrderIterator operator++(int)
{
StridedScanOrderIterator res(*this);
++*this;
return res;
}
StridedScanOrderIterator & operator+=(MultiArrayIndex i)
{
base_type::operator+=(i);
return *this;
}
StridedScanOrderIterator & operator+=(const shape_type &coordOffset)
{
base_type::operator+=(coordOffset);
return *this;
}
StridedScanOrderIterator & operator--()
{
base_type::operator--();
return *this;
}
StridedScanOrderIterator operator--(int)
{
StridedScanOrderIterator res(*this);
--*this;
return res;
}
StridedScanOrderIterator & operator-=(MultiArrayIndex i)
{
return operator+=(-i);
}
StridedScanOrderIterator & operator-=(const shape_type &coordOffset)
{
return operator+=(-coordOffset);
}
StridedScanOrderIterator getEndIterator() const
{
return StridedScanOrderIterator(base_type::getEndIterator());
}
StridedScanOrderIterator operator+(MultiArrayIndex d) const
{
return StridedScanOrderIterator(*this) += d;
}
StridedScanOrderIterator operator-(MultiArrayIndex d) const
{
return StridedScanOrderIterator(*this) -= d;
}
MultiArrayIndex operator-(StridedScanOrderIterator const & other) const
{
return base_type::operator-(other);
}
StridedScanOrderIterator operator+(const shape_type &coordOffset) const
{
return StridedScanOrderIterator(*this) += coordOffset;
}
StridedScanOrderIterator operator-(const shape_type &coordOffset) const
{
return StridedScanOrderIterator(*this) -= coordOffset;
}
MultiArrayIndex index() const
{
return this->scanOrderIndex();
}
StridedScanOrderIterator &
restrictToSubarray(shape_type const & start, shape_type const & stop)
{
base_type::restrictToSubarray(start, stop);
return *this;
}
protected:
StridedScanOrderIterator(base_type const & base)
: base_type(base)
{}
};
//@}
/** \page MultiIteratorPage Multi-dimensional Array Iterators
General iterators for arrays of arbitrary dimension.
<p>
<UL style="list-style-image:url(documents/bullet.gif)">
<LI> \ref vigra::MultiArrayShape
<BR> <em>Difference type for \ref vigra::MultiArrayView or \ref vigra::MultiIterator</em>
<LI> \ref vigra::MultiIterator
<BR> <em>Iterator for unstrided \ref vigra::MultiArrayView</em>
<LI> \ref vigra::StridedMultiIterator
<BR> <em>Iterator for strided \ref vigra::MultiArrayView</em>
<LI> \ref vigra::StridedScanOrderIterator
<BR> <em>STL-compatible random access iterator for \ref vigra::MultiArrayView</em>
<LI> \ref vigra::CoupledScanOrderIterator
<BR> <em>Iterate over multiple images simultaneously in scan order</em>
</UL>
</p>
<p>
The Multidimensional Iterator concept allows navigation on arrays
of arbitrary dimension. It provides two modes of iteration:
<em>direct traversal</em>, and <em>hierarchical traversal</em>.
In general, hierarchical traversal will be faster, while only
direct traversal allows for true random access in all dimensions.
Via the <tt>dim<K>()</tt> function, operations applying to a particular
dimension can be used in the direct traversal mode. In contrast,
direct traversal functions should not be used in the hierarchical mode
because the hierarchical functions are only well-defined if the
iterator points to element 0 in all dimensions below its current dimension.
The current dimension of a <tt>MultiIterator<N, ...></tt> is <tt>N-1</tt>.
</p>
<h3>General Requirements for MultiIterator</h3>
<p>
<table border=2 cellspacing=0 cellpadding=2 width="100%">
<tr><th colspan=2>
Local Types
</th><th>
Meaning
</th>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::value_type</tt></td><td>the underlying arrays's pixel type</td>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::reference</tt></td>
<td>the iterator's reference type (return type of <TT>*iter</TT>). Will be
<tt>value_type &</tt> for a mutable iterator, and convertible to
<tt>value_type const &</tt> for a const iterator.</td>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::pointer</tt></td>
<td>the iterator's pointer type (return type of <TT>iter.operator->()</TT>). Will be
<tt>value_type *</tt> for a mutable iterator, and convertible to
<tt>value_type const *</tt> for a const iterator.</td>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::iterator_category</tt></td>
<td>the iterator tag (<tt>vigra::multi_dimensional_traverser_tag</tt>)</td>
</tr>
<tr><th>
Operation
</th><th>
Result
</th><th>
Semantics
</th>
</tr>
<tr><td colspan=2>
<tt>MultiIterator k;</tt></td><td>default constructor</td>
</tr>
<tr><td colspan=2>
<tt>MultiIterator k(i);</tt></td><td>copy constructor</td>
</tr>
<tr>
<td><tt>k = i</tt></td>
<td><tt>MultiIterator &</tt></td><td>assignment</td>
</tr>
<tr>
<td><tt>i == j</tt></td><td><tt>bool</tt></td>
<td>equality (iterators point to the same element)</td>
</tr>
<tr>
<td><tt>i != j</tt></td><td><tt>bool</tt></td>
<td>inequality (iterators don't point to the same element)</td>
</tr>
<tr>
<td><tt>*i</tt></td><td><tt>MultiIterator::reference</tt></td>
<td>access the current element</td>
</tr>
<tr>
<td><tt>i->member()</tt></td><td>depends on operation</td>
<td>call member function of underlying pixel type via <tt>operator-></tt> of iterator</td>
</tr>
</table>
</p>
<h3>Requirements for Direct Traversal</h3>
<p>
<table border=2 cellspacing=0 cellpadding=2 width="100%">
<tr><th colspan=2>
Local Types
</th><th>
Meaning
</th>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::multi_difference_type</tt></td>
<td>the iterator's multi-dimensional difference type (<TT>TinyVector<MultiArrayIndex, N></TT>)</td>
</tr>
<tr><th>
Operation
</th><th>
Result
</th><th>
Semantics
</th>
</tr>
<tr>
<td><tt>i += diff</tt></td><td><tt>MultiIterator &</tt></td>
<td>add offset to current position</td>
</tr>
<tr>
<td><tt>i -= diff</tt></td><td><tt>MultiIterator &</tt></td>
<td>subtract offset from current position</td>
</tr>
<tr>
<td><tt>i + diff</tt></td><td><tt>MultiIterator</tt></td>
<td>create traverser by adding offset</td>
</tr>
<tr>
<td><tt>i - diff</tt></td><td><tt>MultiIterator</tt></td>
<td>create traverser by subtracting offset</td>
</tr>
<tr>
<td><tt>i[diff]</tt></td><td><tt>MultiIterator::reference</tt></td>
<td>access element at offset <tt>diff</tt></td>
</tr>
<tr>
<td><tt>i.dim<K>()</tt></td><td><tt>MultiIterator<K+1, T, ...></tt></td>
<td>Access the traverser with the current dimension set to K. Typically used to call
navigation functions referring to a particular dimension.<br>
Example (assuming <tt>i, j</tt> are 3-dimensional):<br>
\code
i.dim<0>()++; // increment dimension 0
i.dim<1>()++; // increment dimension 1
i.dim<2>()++; // increment dimension 2
j += MultiIterator::multi_difference_type(1,1,1); // same effect
\endcode
</td>
</tr>
<tr><td colspan=3>
<tt>i, j</tt> are of type <tt>MultiIterator</tt><br>
<tt>diff</tt> is of type <tt>MultiIterator::multi_difference_type</tt><br>
<tt>K</tt> is an integer compile-time constant
</td>
</tr>
</table>
</p>
<p>
Note that it is impossible to support an <tt>operator-</tt> between two iterators which returns
a <tt>MultiIterator::multi_difference_type</tt> because it is impossible to decide to which
dimension a difference applies. Consider for example, a 2-dimensional iterator <tt>i</tt>, and
let <tt>j = i + multi_difference_type(width, 0)</tt>, <tt>k = i + multi_difference_type(0,1)</tt>,
where <tt>width</tt> is the array's total width. In general, <tt>j</tt> and <tt>k</tt> point to
the same memory location, so that the two cases cannot easily be distinguished (it is possible,
but iterator performance will suffer significantly, as is experienced with
\ref vigra::ImageIterator where differencing is allowed).
</p>
<h3>Requirements for Hierarchical Traversal</h3>
<p>
<table border=2 cellspacing=0 cellpadding=2 width="100%">
<tr><th colspan=2>
Local Types
</th><th>
Meaning
</th>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::difference_type</tt></td>
<td>the iterator's difference type (<TT>MultiArrayIndex</TT>)</td>
</tr>
<tr><td colspan=2>
<tt>MultiIterator::next_type</tt></td><td>type of the next iterator
(referring to the next lower dimension) in the hierarchy</td>
</tr>
<tr><th>
Operation
</th><th>
Result
</th><th>
Semantics
</th>
</tr>
<tr>
<td><tt>++i</tt></td><td><tt>MultiIterator &</tt></td>
<td>pre-increment iterator in its current dimension</td>
</tr>
<tr>
<td><tt>i++</tt></td><td><tt>MultiIterator</tt></td>
<td>post-increment iterator in its current dimension</td>
</tr>
<tr>
<td><tt>--i</tt></td><td><tt>MultiIterator &</tt></td>
<td>pre-decrement iterator in its current dimension</td>
</tr>
<tr>
<td><tt>i--</tt></td><td><tt>MultiIterator</tt></td>
<td>post-decrement iterator in its current dimension</td>
</tr>
<tr>
<td><tt>i += d</tt></td><td><tt>MultiIterator &</tt></td>
<td>add <tt>d</tt> in current dimension</td>
</tr>
<tr>
<td><tt>i -= d</tt></td><td><tt>MultiIterator &</tt></td>
<td>subtract <tt>d</tt> in from dimension</td>
</tr>
<tr>
<td><tt>i + d</tt></td><td><tt>MultiIterator</tt></td>
<td>create new iterator by adding <tt>d</tt> in current dimension</td>
</tr>
<tr>
<td><tt>i - d</tt></td><td><tt>MultiIterator</tt></td>
<td>create new iterator by subtracting <tt>d</tt> in current dimension</td>
</tr>
<tr>
<td><tt>i - j</tt></td><td><tt>difference_type</tt></td>
<td>difference of <tt>i</tt> and <tt>j</tt> in the current dimension<br>
<em>Note:</em> The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.</td>
</tr>
<tr>
<td><tt>i < j</tt></td><td><tt>bool</tt></td>
<td><tt>i - j < 0</tt><br>
<em>Note:</em> The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.</td>
</tr>
<tr>
<td><tt>i[d]</tt></td><td><tt>MultiIterator::reference</tt></td>
<td>access element by adding offset <tt>d</tt> in current dimension</td>
</tr>
<tr>
<td><tt>i.begin()</tt></td><td><tt>next_type</tt></td>
<td>create the hierarchical iterator pointing to the first element in the
next lower dimension.<br>
<em>Note:</em> The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.<br>
Usage:<br>
\code
MultiIterator<3, int> i3 = ..., end3 = ...;
for(; i3 != end3; ++i3)
{
MultiIterator<3, int>::next_type i2 = i3.begin(), end2 = i3.end();
for(; i2 != end2; ++i2)
{
MultiIterator<3, int>::next_type::next_type i1 = i2.begin(), end1 = i2.end();
for(; i1 != end1; ++i1)
{
... // do something with the current element
}
}
}
\endcode
</td>
</tr>
<tr>
<td><tt>i.end()</tt></td><td><tt>next_type</tt></td>
<td>create the hierarchical iterator pointing to the past-the-end location in the
next lower dimension.<br>
<em>Note:</em> The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.</td>
</tr>
<tr><td colspan=3>
<tt>i, j</tt> are of type <tt>MultiIterator</tt><br>
<tt>d</tt> is of type <tt>MultiIterator::difference_type</tt>
</td>
</tr>
</table>
</p>
*/
/** \addtogroup MultiIteratorGroup
*/
//@{
template <class POINTER>
struct MultiIteratorStrideTraits
{
typedef MultiArrayIndex stride_type;
typedef const stride_type* stride_array_type;
typedef stride_array_type shape_array_type;
static stride_array_type shift(stride_array_type s, unsigned d)
{
return s + d;
}
};
/********************************************************/
/* */
/* MultiIterator */
/* */
/********************************************************/
/********************************************************/
/* */
/* MultiIterator<1> */
/* */
/********************************************************/
//
template <class T, class REFERENCE, class POINTER>
class MultiIterator<1, T, REFERENCE, POINTER>
{
public:
enum { level = 0 };
typedef T value_type;
typedef REFERENCE reference;
typedef const value_type &const_reference;
typedef POINTER pointer;
typedef const value_type *const_pointer;
typedef typename MultiArrayShape<1>::type multi_difference_type;
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
typedef typename stride_traits::shape_array_type shape_array_type;
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
typedef std::random_access_iterator_tag iterator_category;
protected:
pointer m_ptr;
public:
MultiIterator ()
: m_ptr (0)
{}
MultiIterator (pointer ptr,
const difference_array_type &,
const shape_array_type &)
: m_ptr (ptr)
{}
void operator++ ()
{
++m_ptr;
}
void operator-- ()
{
--m_ptr;
}
MultiIterator operator++ (int)
{
MultiIterator ret = *this;
++(*this);
return ret;
}
MultiIterator operator-- (int)
{
MultiIterator ret = *this;
--(*this);
return ret;
}
MultiIterator &operator+= (difference_type n)
{
m_ptr += n;
return *this;
}
MultiIterator & operator+= (multi_difference_type const & d)
{
m_ptr += d[level];
return *this;
}
MultiIterator &operator-= (difference_type n)
{
m_ptr -= n;
return *this;
}
MultiIterator & operator-= (multi_difference_type const & d)
{
m_ptr -= d[level];
return *this;
}
MultiIterator operator+ (difference_type n) const
{
MultiIterator ret = *this;
ret += n;
return ret;
}
MultiIterator operator+ (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret += d;
return ret;
}
difference_type operator- (MultiIterator const & d) const
{
return (m_ptr - d.m_ptr);
}
MultiIterator operator- (difference_type n) const
{
MultiIterator ret = *this;
ret -= n;
return ret;
}
MultiIterator operator- (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret -= d;
return ret;
}
reference operator[] (difference_type n) const
{
return m_ptr [n];
}
reference operator[] (multi_difference_type const & d) const
{
return m_ptr [d[level]];
}
reference operator* () const
{
return *m_ptr;
}
pointer get () const
{
return m_ptr;
}
pointer operator->() const
{
return &(operator*());
}
bool operator!= (const MultiIterator &rhs) const
{
return m_ptr != rhs.m_ptr;
}
bool operator== (const MultiIterator &rhs) const
{
return m_ptr == rhs.m_ptr;
}
bool operator< (const MultiIterator &rhs) const
{
return m_ptr < rhs.m_ptr;
}
bool operator<= (const MultiIterator &rhs) const
{
return m_ptr <= rhs.m_ptr;
}
bool operator> (const MultiIterator &rhs) const
{
return m_ptr > rhs.m_ptr;
}
bool operator>= (const MultiIterator &rhs) const
{
return m_ptr >= rhs.m_ptr;
}
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d == 0,
"MultiIterator<1>::iteratorForDimension(d): d == 0 required");
const difference_type stride = 1;
return iterator(m_ptr, &stride, 0);
}
template <unsigned int K>
MultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
MultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level];
}
};
/********************************************************/
/* */
/* MultiIterator<2> */
/* */
/********************************************************/
//
template <class T, class REFERENCE, class POINTER>
class MultiIterator<2, T, REFERENCE, POINTER>
#ifndef DOXYGEN // doxygen doesn't understand this inheritance
: public MultiIterator<1, T, REFERENCE, POINTER>
#endif
{
public:
typedef MultiIterator<1, T, REFERENCE, POINTER> base_type;
enum { level = 1 };
typedef T value_type;
typedef REFERENCE reference;
typedef const value_type &const_reference;
typedef POINTER pointer;
typedef const value_type *const_pointer;
typedef typename MultiArrayShape<2>::type multi_difference_type;
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
typedef typename stride_traits::shape_array_type shape_array_type;
typedef base_type next_type;
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
typedef multi_dimensional_traverser_tag iterator_category;
protected:
difference_array_type m_stride;
shape_array_type m_shape;
public:
/* use default copy constructor and assignment operator */
MultiIterator ()
: base_type (),
m_stride (0), m_shape (0)
{}
MultiIterator (pointer ptr,
const difference_array_type & stride,
const shape_array_type & shape)
: base_type (ptr, stride, shape),
m_stride (stride), m_shape (shape)
{}
void operator++ ()
{
this->m_ptr += m_stride [level];
}
void operator-- ()
{
this->m_ptr -= m_stride [level];
}
MultiIterator operator++ (int)
{
MultiIterator ret = *this;
++(*this);
return ret;
}
MultiIterator operator-- (int)
{
MultiIterator ret = *this;
--(*this);
return ret;
}
MultiIterator & operator+= (difference_type n)
{
this->m_ptr += n * m_stride [level];
return *this;
}
MultiIterator & operator+= (multi_difference_type const & d)
{
this->m_ptr += total_stride(d.begin());
return *this;
}
MultiIterator &operator-= (difference_type n)
{
this->m_ptr -= n * m_stride [level];
return *this;
}
MultiIterator & operator-= (multi_difference_type const & d)
{
this->m_ptr -= total_stride(d.begin());
return *this;
}
MultiIterator operator+ (difference_type n) const
{
MultiIterator ret = *this;
ret += n;
return ret;
}
MultiIterator operator+ (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret += d;
return ret;
}
difference_type operator- (MultiIterator const & d) const
{
return (this->m_ptr - d.m_ptr) / this->m_stride[level];
}
MultiIterator operator- (difference_type n) const
{
MultiIterator ret = *this;
ret -= n;
return ret;
}
MultiIterator operator- (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret -= d;
return ret;
}
reference operator[] (difference_type n) const
{
return this->m_ptr [n*m_stride [level]];
}
reference operator[] (multi_difference_type const & d) const
{
return this->m_ptr [total_stride(d.begin())];
}
next_type begin () const
{
return *this;
}
next_type end () const
{
next_type ret = *this;
ret += m_shape [level-1];
return ret;
}
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d <= level,
"MultiIterator<N>::iteratorForDimension(d): d < N required");
return iterator(this->m_ptr, stride_traits::shift(m_stride, d), 0);
}
template <unsigned int K>
MultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
MultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
MultiIterator<2, T, REFERENCE, POINTER> &
dim1() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level]*m_stride[level] + base_type::total_stride(d);
}
};
/********************************************************/
/* */
/* MultiIterator<N> */
/* */
/********************************************************/
/** \brief A multi-dimensional hierarchical iterator to be used with
\ref vigra::MultiArrayView if it is not strided.
See \ref MultiIteratorPage for further documentation.
<b>\#include</b> \<vigra/multi_iterator.hxx\> <br>
Namespace: vigra
*/
template <unsigned int N, class T, class REFERENCE, class POINTER>
class MultiIterator
#ifndef DOXYGEN // doxygen doesn't understand this inheritance
: public MultiIterator<N-1, T, REFERENCE, POINTER>
#endif
{
public:
/** the type of the parent in the inheritance hierarchy.
*/
typedef MultiIterator<N-1, T, REFERENCE, POINTER> base_type;
/** the iterator's level in the dimension hierarchy
*/
enum { level = N-1 };
/** the iterator's value type
*/
typedef T value_type;
/** reference type (result of operator[])
*/
typedef REFERENCE reference;
/** const reference type (result of operator[] const)
*/
typedef const value_type &const_reference;
/** pointer type
*/
typedef POINTER pointer;
/** const pointer type
*/
typedef const value_type *const_pointer;
/** multi difference type
(used for offsetting along all axes simultaneously)
*/
typedef typename MultiArrayShape<N>::type multi_difference_type;
/** difference type (used for offsetting)
*/
#ifndef DOXYGEN
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
typedef typename stride_traits::shape_array_type shape_array_type;
#else
typedef MultiArrayIndex difference_type;
#endif
/** the MultiIterator for the next lower dimension.
*/
typedef base_type next_type;
/** the 1-dimensional iterator for this iterator hierarchy
(result of iteratorForDimension()).
*/
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
/** the iterator tag (image traverser)
*/
typedef multi_dimensional_traverser_tag iterator_category;
/* use default copy constructor and assignment operator */
/** default constructor.
*/
MultiIterator ()
{}
/** construct from pointer, strides (offset of a sample to the
next) for every dimension, and the shape.
*/
MultiIterator (pointer ptr,
const difference_array_type & stride,
const shape_array_type & shape)
: base_type (ptr, stride, shape)
{}
/** prefix-increment the iterator in its current dimension
*/
void operator++ ()
{
this->m_ptr += this->m_stride [level];
}
/** prefix-decrement the iterator in its current dimension
*/
void operator-- ()
{
this->m_ptr -= this->m_stride [level];
}
/** postfix-increment the iterator in its current dimension
*/
MultiIterator operator++ (int)
{
MultiIterator ret = *this;
++(*this);
return ret;
}
/** postfix-decrement the iterator in its current dimension
*/
MultiIterator operator-- (int)
{
MultiIterator ret = *this;
--(*this);
return ret;
}
/** increment the iterator in its current dimension
by the given value.
*/
MultiIterator & operator+= (difference_type n)
{
this->m_ptr += n * this->m_stride [level];
return *this;
}
/** increment the iterator in all dimensions
by the given offset.
*/
MultiIterator & operator+= (multi_difference_type const & d)
{
this->m_ptr += total_stride(d.begin());
return *this;
}
/** decrement the iterator in its current dimension
by the given value.
*/
MultiIterator & operator-= (difference_type n)
{
this->m_ptr -= n * this->m_stride [level];
return *this;
}
/** decrement the iterator in all dimensions
by the given offset.
*/
MultiIterator & operator-= (multi_difference_type const & d)
{
this->m_ptr -= total_stride(d.begin());
return *this;
}
/** addition within current dimension
*/
MultiIterator operator+ (difference_type n) const
{
MultiIterator ret = *this;
ret += n;
return ret;
}
/** addition along all dimensions
*/
MultiIterator operator+ (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret += d;
return ret;
}
/** difference of two iterators in the current dimension.
The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.
*/
difference_type operator- (MultiIterator const & d) const
{
return (this->m_ptr - d.m_ptr) / this->m_stride[level];
}
/** subtraction within current dimension
*/
MultiIterator operator- (difference_type n) const
{
MultiIterator ret = *this;
ret -= n;
return ret;
}
/** subtraction along all dimensions
*/
MultiIterator operator- (multi_difference_type const & d) const
{
MultiIterator ret = *this;
ret -= d;
return ret;
}
#ifdef DOXYGEN /* documentation only: operators *, ->, ==, !=, <, <=, >, >= are inherited */
/** derefenrence item
*/
reference operator* () const;
/** get address of current item
*/
pointer get () const;
/** call method of current item
*/
pointer operator->() const;
/** inequality. True if iterators reference different items.
*/
bool operator!= (const MultiIterator &rhs) const;
/** equality. True if iterators reference the same items.
*/
bool operator== (const MultiIterator &rhs) const;
/** less than.
*/
bool operator< (const MultiIterator &rhs) const;
/** less or equal.
*/
bool operator<= (const MultiIterator &rhs) const;
/** greater than.
*/
bool operator> (const MultiIterator &rhs) const;
/** greater or equal.
*/
bool operator>= (const MultiIterator &rhs) const;
#endif
/** access the array element at the given offset in
the current dimension.
*/
reference operator[] (difference_type n) const
{
return this->m_ptr [n* this->m_stride [level]];
}
/** access the array element at the given offset.
*/
reference operator[] (multi_difference_type const & d) const
{
return this->m_ptr [total_stride(d.begin())];
}
/** Return the (N-1)-dimensional multi-iterator that points to
the first (N-1)-dimensional subarray of the
N-dimensional array this iterator is referring to.
The result is only valid if this iterator refers to location
0 in <em>all</em> dimensions below its current dimension N,
otherwise it is undefined. Usage:
\code
MultiIterator<2, int> outer = ...; // this iterator
MultiIterator<2, int>::next_type inner = outer.begin();
for(; inner != outer.end(); ++inner)
{
// manipulate current 1D subimage
}
\endcode
*/
next_type begin () const
{
return *this;
}
/** Return the (N-1)-dimensional multi-iterator that points beyond
the last (N-1)-dimensional subarray of the
N-dimensional array this iterator is referring to.
The result is only valid if this iterator refers to location
0 in <em>all</em> dimensions below its current dimension N,
otherwise it is undefined.
*/
next_type end () const
{
next_type ret = *this;
ret += this->m_shape [level-1];
return ret;
}
/** Get a 1-dimensional, STL-compatible iterator for the
given dimension, pointing to the current element of <TT>this</TT>.
Usage:
\code
MultiIterator<3, int> outer = ...; // this iterator
MultiIterator<3, int>::iterator i = outer.iteratorForDimension(1);
MultiIterator<3, int>::iterator end = i + height;
for(; i != end; ++i)
{
// go down the current column starting at the location of 'outer'
}
\endcode
*/
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d <= level,
"MultiIterator<N>::iteratorForDimension(d): d < N required");
return iterator(this->m_ptr, stride_traits::shift(this->m_stride, d),0);
}
/** Return the multi-iterator that operates on dimension K in order
to manipulate this dimension directly. Usage:
\code
MultiIterator<3, int> i3 = ...;
i3.template dim<2>()++; // increment outer dimension
i3.template dim<0>()++; // increment inner dimension
\endcode
For convenience, the same functionality is also available
as <tt>dim0()</tt>, <tt>dim1()</tt> etc. up to <tt>dim4()</tt>:
\code
MultiIterator<3, int> i3 = ...;
i3.dim2()++; // increment outer dimension
i3.dim0()++; // increment inner dimension
\endcode
*/
template <unsigned int K>
MultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
MultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
MultiIterator<2, T, REFERENCE, POINTER> &
dim1() { return *this; }
MultiIterator<3, T, REFERENCE, POINTER> &
dim2() { return *this; }
MultiIterator<4, T, REFERENCE, POINTER> &
dim3() { return *this; }
MultiIterator<5, T, REFERENCE, POINTER> &
dim4() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level]*this->m_stride[level] + base_type::total_stride(d);
}
};
/********************************************************/
/* */
/* StridedMultiIterator */
/* */
/********************************************************/
/********************************************************/
/* */
/* StridedMultiIterator<1> */
/* */
/********************************************************/
//
template <class T, class REFERENCE, class POINTER>
class StridedMultiIterator<1, T, REFERENCE, POINTER>
{
public:
enum { level = 0 };
typedef T value_type;
typedef REFERENCE reference;
typedef const value_type &const_reference;
typedef POINTER pointer;
typedef const value_type *const_pointer;
typedef typename MultiArrayShape<1>::type multi_difference_type;
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
typedef typename stride_traits::shape_array_type shape_array_type;
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
typedef std::random_access_iterator_tag iterator_category;
protected:
pointer m_ptr;
difference_type m_stride;
/* use default copy constructor and assignment operator */
public:
StridedMultiIterator ()
: m_ptr (0), m_stride (0)
{}
StridedMultiIterator (pointer ptr,
const difference_array_type & stride,
const shape_array_type &)
: m_ptr (ptr), m_stride (stride [level])
{}
void operator++ ()
{
m_ptr += m_stride;
}
void operator-- ()
{
m_ptr -= m_stride;
}
StridedMultiIterator operator++ (int)
{
StridedMultiIterator ret = *this;
++(*this);
return ret;
}
StridedMultiIterator operator-- (int)
{
StridedMultiIterator ret = *this;
--(*this);
return ret;
}
StridedMultiIterator &operator+= (difference_type n)
{
m_ptr += n * m_stride;
return *this;
}
StridedMultiIterator & operator+= (multi_difference_type const & d)
{
m_ptr += d[level] * m_stride;
return *this;
}
StridedMultiIterator &operator-= (difference_type n)
{
m_ptr -= n * m_stride;
return *this;
}
StridedMultiIterator & operator-= (multi_difference_type const & d)
{
m_ptr -= d[level] * m_stride;
return *this;
}
StridedMultiIterator operator+ (difference_type n) const
{
StridedMultiIterator ret = *this;
ret += n;
return ret;
}
StridedMultiIterator operator+ (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret += d;
return ret;
}
difference_type operator- (StridedMultiIterator const & d) const
{
return (m_ptr - d.m_ptr) / m_stride;
}
StridedMultiIterator operator- (difference_type n) const
{
StridedMultiIterator ret = *this;
ret -= n;
return ret;
}
StridedMultiIterator operator- (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret -= d;
return ret;
}
reference operator[] (difference_type n) const
{
return m_ptr [n*m_stride];
}
reference operator[] (multi_difference_type const & d) const
{
return m_ptr [d[level]*m_stride];
}
reference operator* () const
{
return *m_ptr;
}
pointer get () const
{
return m_ptr;
}
pointer operator->() const
{
return &(operator*());
}
bool operator!= (const StridedMultiIterator &rhs) const
{
return m_ptr != rhs.m_ptr;
}
bool operator== (const StridedMultiIterator &rhs) const
{
return m_ptr == rhs.m_ptr;
}
bool operator< (const StridedMultiIterator &rhs) const
{
return m_ptr < rhs.m_ptr;
}
bool operator<= (const StridedMultiIterator &rhs) const
{
return m_ptr <= rhs.m_ptr;
}
bool operator> (const StridedMultiIterator &rhs) const
{
return m_ptr > rhs.m_ptr;
}
bool operator>= (const StridedMultiIterator &rhs) const
{
return m_ptr >= rhs.m_ptr;
}
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d == 0,
"StridedMultiIterator<1>::iteratorForDimension(d): d == 0 required");
const difference_type stride = 1;
return iterator(m_ptr, &stride, 0);
}
template <unsigned int K>
StridedMultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
StridedMultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level] * m_stride;
}
};
/********************************************************/
/* */
/* StridedMultiIterator<2> */
/* */
/********************************************************/
//
template <class T, class REFERENCE, class POINTER>
class StridedMultiIterator<2, T, REFERENCE, POINTER>
#ifndef DOXYGEN // doxygen doesn't understand this inheritance
: public StridedMultiIterator<1, T, REFERENCE, POINTER>
#endif
{
public:
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> base_type;
enum { level = 1 };
typedef T value_type;
typedef REFERENCE reference;
typedef const value_type &const_reference;
typedef POINTER pointer;
typedef const value_type *const_pointer;
typedef typename MultiArrayShape<2>::type multi_difference_type;
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
typedef typename stride_traits::shape_array_type shape_array_type;
typedef base_type next_type;
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
typedef multi_dimensional_traverser_tag iterator_category;
protected:
difference_array_type m_stride;
shape_array_type m_shape;
public:
/* use default copy constructor and assignment operator */
StridedMultiIterator ()
: base_type (),
m_stride (0), m_shape (0)
{}
StridedMultiIterator (pointer ptr,
const difference_array_type & stride,
const shape_array_type & shape)
: base_type (ptr, stride, shape),
m_stride (stride), m_shape (shape)
{}
void operator++ ()
{
this->m_ptr += m_stride [level];
}
void operator-- ()
{
this->m_ptr -= m_stride [level];
}
StridedMultiIterator operator++ (int)
{
StridedMultiIterator ret = *this;
++(*this);
return ret;
}
StridedMultiIterator operator-- (int)
{
StridedMultiIterator ret = *this;
--(*this);
return ret;
}
StridedMultiIterator & operator+= (difference_type n)
{
this->m_ptr += n * m_stride [level];
return *this;
}
StridedMultiIterator & operator+= (multi_difference_type const & d)
{
this->m_ptr += total_stride(d.begin());
return *this;
}
StridedMultiIterator &operator-= (difference_type n)
{
this->m_ptr -= n * m_stride [level];
return *this;
}
StridedMultiIterator & operator-= (multi_difference_type const & d)
{
this->m_ptr -= total_stride(d.begin());
return *this;
}
StridedMultiIterator operator+ (difference_type n) const
{
StridedMultiIterator ret = *this;
ret += n;
return ret;
}
StridedMultiIterator operator+ (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret += d;
return ret;
}
difference_type operator- (StridedMultiIterator const & d) const
{
return (this->m_ptr - d.m_ptr) / this->m_stride[level];
}
StridedMultiIterator operator- (difference_type n) const
{
StridedMultiIterator ret = *this;
ret -= n;
return ret;
}
StridedMultiIterator operator- (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret -= d;
return ret;
}
reference operator[] (difference_type n) const
{
return this->m_ptr [n*m_stride [level]];
}
reference operator[] (multi_difference_type const & d) const
{
return this->m_ptr [total_stride(d.begin())];
}
next_type begin () const
{
return *this;
}
next_type end () const
{
next_type ret = *this;
ret += m_shape [level-1];
return ret;
}
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d <= level,
"StridedMultiIterator<N>::iteratorForDimension(d): d < N required");
return iterator(this->m_ptr, stride_traits::shift(m_stride, d), 0);
}
template <unsigned int K>
StridedMultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
StridedMultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
StridedMultiIterator<2, T, REFERENCE, POINTER> &
dim1() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level]*m_stride[level] + base_type::total_stride(d);
}
};
/********************************************************/
/* */
/* StridedMultiIterator<N> */
/* */
/********************************************************/
/** \brief A multi-dimensional hierarchical iterator to be used with
\ref vigra::MultiArrayView if it is not strided.
See \ref MultiIteratorPage for further documentation.
<b>\#include</b> \<vigra/multi_iterator.hxx\> <br>
Namespace: vigra
*/
template <unsigned int N, class T, class REFERENCE, class POINTER>
class StridedMultiIterator
#ifndef DOXYGEN // doxygen doesn't understand this inheritance
: public StridedMultiIterator<N-1, T, REFERENCE, POINTER>
#endif
{
public:
/** the type of the parent in the inheritance hierarchy.
*/
typedef StridedMultiIterator<N-1, T, REFERENCE, POINTER> base_type;
/** the iterator's level in the dimension hierarchy
*/
enum { level = N-1 };
/** the iterator's value type
*/
typedef T value_type;
/** reference type (result of operator[])
*/
typedef REFERENCE reference;
/** const reference type (result of operator[] const)
*/
typedef const value_type &const_reference;
/** pointer type
*/
typedef POINTER pointer;
/** const pointer type
*/
typedef const value_type *const_pointer;
/** multi difference type
(used for offsetting along all axes simultaneously)
*/
typedef typename MultiArrayShape<N>::type multi_difference_type;
/** difference type (used for offsetting)
*/
#ifndef DOXYGEN
typedef MultiIteratorStrideTraits<POINTER> stride_traits;
typedef typename stride_traits::stride_type difference_type;
typedef typename stride_traits::stride_array_type difference_array_type;
#else
typedef MultiArrayIndex difference_type;
#endif
/** the StridedMultiIterator for the next lower dimension.
*/
typedef base_type next_type;
/** the 1-dimensional iterator for this iterator hierarchy
(result of iteratorForDimension()).
*/
typedef StridedMultiIterator<1, T, REFERENCE, POINTER> iterator;
/** the iterator tag (image traverser)
*/
typedef multi_dimensional_traverser_tag iterator_category;
/* use default copy constructor and assignment operator */
/** default constructor.
*/
StridedMultiIterator ()
{}
/** construct from pointer, strides (offset of a sample to the
next) for every dimension, and the shape.
*/
StridedMultiIterator (pointer ptr,
const difference_array_type & stride,
const difference_array_type & shape)
: base_type (ptr, stride, shape)
{}
/** prefix-increment the iterator in its current dimension
*/
void operator++ ()
{
this->m_ptr += this->m_stride [level];
}
/** prefix-decrement the iterator in its current dimension
*/
void operator-- ()
{
this->m_ptr -= this->m_stride [level];
}
/** postfix-increment the iterator in its current dimension
*/
StridedMultiIterator operator++ (int)
{
StridedMultiIterator ret = *this;
++(*this);
return ret;
}
/** postfix-decrement the iterator in its current dimension
*/
StridedMultiIterator operator-- (int)
{
StridedMultiIterator ret = *this;
--(*this);
return ret;
}
/** increment the iterator in its current dimension
by the given value.
*/
StridedMultiIterator & operator+= (difference_type n)
{
this->m_ptr += n * this->m_stride [level];
return *this;
}
/** increment the iterator in all dimensions
by the given offset.
*/
StridedMultiIterator & operator+= (multi_difference_type const & d)
{
this->m_ptr += total_stride(d.begin());
return *this;
}
/** decrement the iterator in its current dimension
by the given value.
*/
StridedMultiIterator & operator-= (difference_type n)
{
this->m_ptr -= n * this->m_stride [level];
return *this;
}
/** decrement the iterator in all dimensions
by the given offset.
*/
StridedMultiIterator & operator-= (multi_difference_type const & d)
{
this->m_ptr -= total_stride(d.begin());
return *this;
}
/** addition within current dimension
*/
StridedMultiIterator operator+ (difference_type n) const
{
StridedMultiIterator ret = *this;
ret += n;
return ret;
}
/** addition along all dimensions
*/
StridedMultiIterator operator+ (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret += d;
return ret;
}
/** difference of two iterators in the current dimension.
The result of this operation is undefined if the iterator
doesn't point to element 0 in all dimensions below its current dimension.
*/
difference_type operator- (StridedMultiIterator const & d) const
{
return (this->m_ptr - d.m_ptr) / this->m_stride[level];
}
/** subtraction within current dimension
*/
StridedMultiIterator operator- (difference_type n) const
{
StridedMultiIterator ret = *this;
ret -= n;
return ret;
}
/** subtraction along all dimensions
*/
StridedMultiIterator operator- (multi_difference_type const & d) const
{
StridedMultiIterator ret = *this;
ret -= d;
return ret;
}
#ifdef DOXYGEN /* documentation only: operators *, ->, ==, !=, <, <=, >, >= are inherited */
/** derefenrence item
*/
reference operator* () const;
/** get address of current item
*/
pointer get () const;
/** call method of current item
*/
pointer operator->() const;
/** inequality. True if iterators reference different items.
*/
bool operator!= (const StridedMultiIterator &rhs) const;
/** equality. True if iterators reference the same items.
*/
bool operator== (const StridedMultiIterator &rhs) const;
/** less than.
*/
bool operator< (const StridedMultiIterator &rhs) const;
/** less or equal.
*/
bool operator<= (const StridedMultiIterator &rhs) const;
/** greater than.
*/
bool operator> (const StridedMultiIterator &rhs) const;
/** greater or equal.
*/
bool operator>= (const StridedMultiIterator &rhs) const;
#endif
/** access the array element at the given offset in
the current dimension.
*/
reference operator[] (difference_type n) const
{
return this->m_ptr [n* this->m_stride [level]];
}
/** access the array element at the given offset.
*/
reference operator[] (multi_difference_type const & d) const
{
return this->m_ptr [total_stride(d.begin())];
}
/** Return the (N-1)-dimensional multi-iterator that points to
the first (N-1)-dimensional subarray of the
N-dimensional array this iterator is referring to.
The result is only valid if this iterator refers to location
0 in <em>all</em> dimensions below its current dimension N,
otherwise it is undefined. Usage:
\code
StridedMultiIterator<2, int> outer = ...; // this iterator
StridedMultiIterator<2, int>::next_type inner = outer.begin();
for(; inner != outer.end(); ++inner)
{
// manipulate current 1D subimage
}
\endcode
*/
next_type begin () const
{
return *this;
}
/** Return the (N-1)-dimensional multi-iterator that points beyond
the last (N-1)-dimensional subarray of the
N-dimensional array this iterator is referring to.
The result is only valid if this iterator refers to location
0 in <em>all</em> dimensions below its current dimension N,
otherwise it is undefined.
*/
next_type end () const
{
next_type ret = *this;
ret += this->m_shape [level-1];
return ret;
}
/** Get a 1-dimensional, STL-compatible iterator for the
given dimension, pointing to the current element of <TT>this</TT>.
Usage:
\code
StridedMultiIterator<3, int> outer = ...; // this iterator
StridedMultiIterator<3, int>::iterator i = outer.iteratorForDimension(1);
StridedMultiIterator<3, int>::iterator end = i + height;
for(; i != end; ++i)
{
// go down the current column starting at the location of 'outer'
}
\endcode
*/
iterator iteratorForDimension(unsigned int d) const
{
vigra_precondition(d <= level,
"StridedMultiIterator<N>::iteratorForDimension(d): d < N required");
return iterator(this->m_ptr, stride_traits::shift(this->m_stride, d),0);
}
/** Return the multi-iterator that operates on dimension K in order
to manipulate this dimension directly. Usage:
\code
StridedMultiIterator<3, int> i3 = ...;
i3.template dim<2>()++; // increment outer dimension
i3.template dim<0>()++; // increment inner dimension
\endcode
For convenience, the same functionality is also available
as <tt>dim0()</tt>, <tt>dim1()</tt> etc. up to <tt>dim4()</tt>:
\code
StridedMultiIterator<3, int> i3 = ...;
i3.dim2()++; // increment outer dimension
i3.dim0()++; // increment inner dimension
\endcode
*/
template <unsigned int K>
StridedMultiIterator<K+1, T, REFERENCE, POINTER> &
dim()
{
return *this;
}
StridedMultiIterator<1, T, REFERENCE, POINTER> &
dim0() { return *this; }
StridedMultiIterator<2, T, REFERENCE, POINTER> &
dim1() { return *this; }
StridedMultiIterator<3, T, REFERENCE, POINTER> &
dim2() { return *this; }
StridedMultiIterator<4, T, REFERENCE, POINTER> &
dim3() { return *this; }
StridedMultiIterator<5, T, REFERENCE, POINTER> &
dim4() { return *this; }
protected:
difference_type
total_stride(typename multi_difference_type::const_iterator d) const
{
return d[level]*this->m_stride[level] + base_type::total_stride(d);
}
};
//@}
} // namespace vigra
namespace std {
template <unsigned int N, class T, class REFERENCE, class POINTER>
ostream & operator<<(ostream & o, vigra::StridedScanOrderIterator<N, T, REFERENCE, POINTER> const & i)
{
o << *i;
return o;
}
} // namespace std
#endif // VIGRA_MULTI_ITERATOR_HXX
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