#include <itkConstNeighborhoodIteratorWithOnlyIndex.h>

Inheritance diagram for itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >:

Collaboration diagram for itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >:

Detailed Description

template<typename TImage>
class itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >

Index-only version of ConstNeighborhoodIterator, defining iteration of a local N-dimensional neighborhood of indecies across an itk::Image or itk::ImageBase.

ConstNeighborhoodIteratorWithOnlyIndex implements the index-only methods of NeighborhoodIterator. No image data is accessed, so this iterator can be used with type itk::ImageBase. It serves as a base class from which other iterators can be derived. See NeighborhoodIterator for more complete information.

The parent class itk::Neighborhood is declared with 'char' as its first template parameter, because the pixel type is not used in this class.

Other index-only iterators:

See Also: ImageConstIteratorWithOnlyIndex; ConstNeighborhoodIteratorWithOnlyIndex

Other iterators:

See Also: ImageIterator; NeighborhoodIterator; Neighborhood

Definition at line 60 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

Public Types
using	ConstIterator = typename Superclass::ConstIterator

using	DimensionValueType = unsigned int

using	DummyNeighborhoodPixelType = char

using	ImageType = TImage

using	IndexType = Index< Self::Dimension >

using	Iterator = typename Superclass::Iterator

using	NeighborhoodType = Neighborhood< DummyNeighborhoodPixelType, Self::Dimension >

using	NeighborIndexType = typename NeighborhoodType::NeighborIndexType

using	OffsetType = typename Superclass::OffsetType

using	RadiusType = typename Superclass::RadiusType

using	RegionType = typename TImage::RegionType

using	Self = ConstNeighborhoodIteratorWithOnlyIndex

using	SizeType = typename Superclass::SizeType

using	Superclass = Neighborhood< DummyNeighborhoodPixelType, Self::Dimension >

Public Types inherited from itk::Neighborhood< char, TImage::ImageDimension >
using	AllocatorType = NeighborhoodAllocator< char >

using	ConstIterator = typename AllocatorType::const_iterator

using	DimensionValueType = unsigned int

using	Iterator = typename AllocatorType::iterator

using	NeighborIndexType = SizeValueType

using	OffsetType = Offset< VDimension >

using	PixelType = char

using	RadiusType = ::itk::Size< VDimension >

using	Self = Neighborhood

using	SizeType = ::itk::Size< VDimension >

using	SizeValueType = typename SizeType::SizeValueType

using	SliceIteratorType = SliceIterator< char, Self >

Public Member Functions
OffsetType	ComputeInternalIndex (NeighborIndexType n) const

	ConstNeighborhoodIteratorWithOnlyIndex ()

	ConstNeighborhoodIteratorWithOnlyIndex (const ConstNeighborhoodIteratorWithOnlyIndex &)

	ConstNeighborhoodIteratorWithOnlyIndex (const SizeType &radius, const ImageType *ptr, const RegionType &region)

IndexType	GetBeginIndex () const

IndexType	GetBound () const

IndexValueType	GetBound (NeighborIndexType n) const

RegionType	GetBoundingBoxAsImageRegion () const

const ImageType *	GetImagePointer () const

ITK_ITERATOR_VIRTUAL IndexType	GetIndex () const ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL IndexType	GetIndex (const OffsetType &o) const ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL IndexType	GetIndex (NeighborIndexType i) const ITK_ITERATOR_FINAL

bool	GetNeedToUseBoundaryCondition () const

RegionType	GetRegion () const

ITK_ITERATOR_VIRTUAL void	GoToBegin () ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL void	GoToEnd () ITK_ITERATOR_FINAL

bool	InBounds () const

bool	IndexInBounds (const NeighborIndexType n, OffsetType &internalIndex, OffsetType &offset) const

ITK_ITERATOR_VIRTUAL void	Initialize (const SizeType &radius, const ImageType *ptr, const RegionType &region) ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL bool	IsAtBegin () const ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL bool	IsAtEnd () const ITK_ITERATOR_FINAL

void	NeedToUseBoundaryConditionOff ()

void	NeedToUseBoundaryConditionOn ()

bool	operator!= (const Self &it) const

Self &	operator++ ()

Self &	operator+= (const OffsetType &)

OffsetType	operator- (const Self &b)

Self &	operator-- ()

Self &	operator-= (const OffsetType &)

bool	operator< (const Self &it) const

bool	operator<= (const Self &it) const

Self &	operator= (const Self &orig)

bool	operator== (const Self &it) const

bool	operator> (const Self &it) const

bool	operator>= (const Self &it) const

void	PrintSelf (std::ostream &, Indent) const override

void	SetLocation (const IndexType &position)

void	SetNeedToUseBoundaryCondition (bool b)

	~ConstNeighborhoodIteratorWithOnlyIndex () override=default

Public Member Functions inherited from itk::Neighborhood< char, TImage::ImageDimension >
NeighborIndexType	GetCenterNeighborhoodIndex () const

char	GetCenterValue () const

virtual NeighborIndexType	GetNeighborhoodIndex (const OffsetType &) const

OffsetType	GetOffset (NeighborIndexType i) const

const SizeType	GetRadius () const

SizeValueType	GetRadius (DimensionValueType n) const

SizeValueType	GetSize (DimensionValueType n) const

SizeType	GetSize () const

std::slice	GetSlice (unsigned int) const

OffsetValueType	GetStride (DimensionValueType axis) const

	itkTypeMacroNoParent (Neighborhood)

	Neighborhood (const Self &other)

	Neighborhood (Self &&)=default

bool	operator!= (const Self &other) const

Self &	operator= (const Self &other)

Self &	operator= (Self &&)=default

bool	operator== (const Self &other) const

void	Print (std::ostream &os) const

void	SetRadius (const SizeType &)

void	SetRadius (const SizeValueType)

NeighborIndexType	Size () const

virtual	~Neighborhood ()=default

	Neighborhood ()

Iterator	End ()

ConstIterator	End () const

Iterator	Begin ()

ConstIterator	Begin () const

char &	operator[] (NeighborIndexType i)

const char &	operator[] (NeighborIndexType i) const

char &	GetElement (NeighborIndexType i)

char &	operator[] (const OffsetType &o)

const char &	operator[] (const OffsetType &o) const

void	SetRadius (const SizeValueType *rad)

AllocatorType &	GetBufferReference ()

const AllocatorType &	GetBufferReference () const

Static Public Attributes
static constexpr DimensionValueType	Dimension = TImage::ImageDimension

Static Public Attributes inherited from itk::Neighborhood< char, TImage::ImageDimension >
static constexpr unsigned int	NeighborhoodDimension

Protected Member Functions
ITK_ITERATOR_VIRTUAL void	SetBeginIndex (const IndexType &start) ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL void	SetBound (const SizeType &) ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL void	SetEndIndex () ITK_ITERATOR_FINAL

ITK_ITERATOR_VIRTUAL void	SetLoop (const IndexType &p) ITK_ITERATOR_FINAL

Protected Member Functions inherited from itk::Neighborhood< char, TImage::ImageDimension >
virtual void	Allocate (NeighborIndexType i)

virtual void	ComputeNeighborhoodOffsetTable ()

virtual void	ComputeNeighborhoodStrideTable ()

void	SetSize ()

Protected Attributes
IndexType	m_BeginIndex

IndexType	m_Bound

ImageType::ConstPointer	m_ConstImage

IndexType	m_EndIndex

bool	m_InBounds [Dimension]

IndexType	m_InnerBoundsHigh

IndexType	m_InnerBoundsLow

bool	m_IsInBounds

bool	m_IsInBoundsValid

IndexType	m_Loop

bool	m_NeedToUseBoundaryCondition

RegionType	m_Region

Member Typedef Documentation

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ConstIterator = typename Superclass::ConstIterator

Definition at line 82 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::DimensionValueType = unsigned int

Type used to refer to space dimensions

Definition at line 66 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::DummyNeighborhoodPixelType = char

Definition at line 71 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ImageType = TImage

Typedef support for common objects

Definition at line 85 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::IndexType = Index< Self::Dimension >

Definition at line 87 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::Iterator = typename Superclass::Iterator

Definition at line 81 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::NeighborhoodType = Neighborhood< DummyNeighborhoodPixelType, Self::Dimension >

Definition at line 88 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::NeighborIndexType = typename NeighborhoodType::NeighborIndexType

Type used to refer to the elements in the list of neighbor pixels.

Definition at line 91 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::OffsetType = typename Superclass::OffsetType

Inherit type alias from superclass

Definition at line 78 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::RadiusType = typename Superclass::RadiusType

Definition at line 79 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::RegionType = typename TImage::RegionType

Definition at line 86 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::Self = ConstNeighborhoodIteratorWithOnlyIndex

Standard class type aliases.

Definition at line 74 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SizeType = typename Superclass::SizeType

Definition at line 80 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

using itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::Superclass = Neighborhood< DummyNeighborhoodPixelType, Self::Dimension >

Definition at line 75 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

Constructor & Destructor Documentation

template<typename TImage>

itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ConstNeighborhoodIteratorWithOnlyIndex ( )

Default constructor

template<typename TImage>

itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::~ConstNeighborhoodIteratorWithOnlyIndex ( )

overridedefault

Virtual destructor

template<typename TImage>

itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ConstNeighborhoodIteratorWithOnlyIndex ( const ConstNeighborhoodIteratorWithOnlyIndex< TImage > & )

Copy constructor

template<typename TImage>

itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ConstNeighborhoodIteratorWithOnlyIndex	(	const SizeType &	radius,
		const ImageType *	ptr,
		const RegionType &	region
	)

Constructor which establishes the region size, neighborhood, and image over which to walk.

Member Function Documentation

template<typename TImage>

OffsetType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::ComputeInternalIndex ( NeighborIndexType n ) const

Computes the internal, N-d offset of a pixel array position n from (0,0, ..., 0) in the "upper-left" corner of the neighborhood.

template<typename TImage>

IndexType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetBeginIndex ( ) const

inline

Returns the N-dimensional starting index of the iterator's position on the image.

Definition at line 164 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

IndexType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetBound ( ) const

inline

Returns the array of upper loop bounds used during iteration.

Definition at line 117 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

IndexValueType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetBound ( NeighborIndexType n ) const

inline

Returns the loop bound used to define the edge of a single dimension in the itk::Image region.

Definition at line 124 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

RegionType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetBoundingBoxAsImageRegion ( ) const

Returns a bounding box for the region spanned by this neighborhood represented by an itk::ImageRegion

template<typename TImage>

const ImageType* itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetImagePointer ( ) const

inline

Returns a smartpointer to the image on which this iterator operates.

Definition at line 130 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL IndexType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetIndex ( ) const

inline

Returns the N-dimensional index of the iterator's position in the image.

Definition at line 137 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

Referenced by itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator!=().

template<typename TImage>

ITK_ITERATOR_VIRTUAL IndexType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetIndex ( const OffsetType & o ) const

inline

Returns the image index for neighbor pixel at offset o from the center of the neighborhood.

Definition at line 144 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL IndexType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetIndex ( NeighborIndexType i ) const

inline

Returns the image index for neighbor pixel at index i in the neighborhood.

Definition at line 151 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetNeedToUseBoundaryCondition ( ) const

inline

Definition at line 310 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

RegionType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetRegion ( ) const

inline

Returns the region of iteration.

Definition at line 157 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GoToBegin ( )

Method for rewinding the iterator to its beginning image index.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GoToEnd ( )

Method for sending the iterator to one past the last index in its region.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::InBounds ( ) const

Returns false if the iterator overlaps region boundaries, true otherwise. Also updates an internal boolean array indicating which of the iterator's faces are out of bounds.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::IndexInBounds	(	const NeighborIndexType	n,
		OffsetType &	internalIndex,
		OffsetType &	offset
	)		const

Returns true if the neighborhood index is within region boundaries, false otherwise. If false, then internalIndex and offset are calculated. Otherwise their values are left unchanged. Also updates an internal boolean array indicating which of the iterator's faces are out of bounds.

Parameters

n	- linear neighborhood index.
internalIndex	- calculated for index `n` only when the neighborhood is not completely within region boundaries.
offset	- per-dimension offsets for index n to nearest boundary index, calculate only when the neighborhood is not completely within region boundaries.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::Initialize	(	const SizeType &	radius,
		const ImageType *	ptr,
		const RegionType &	region
	)

Initializes the iterator to walk a particular image and a particular region of that image.

template<typename TImage>

ITK_ITERATOR_VIRTUAL bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::IsAtBegin ( ) const

inline

Virtual method for determining whether the iterator is at the beginning of its iteration region.

Definition at line 186 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::IsAtEnd ( ) const

Virtual method for determining whether the iterator has reached the end of its iteration region.

template<typename TImage>

void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::NeedToUseBoundaryConditionOff ( )

inline

Definition at line 300 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::NeedToUseBoundaryConditionOn ( )

inline

Definition at line 295 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator!= ( const Self & it ) const

inline

Returns a boolean != comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored.

Definition at line 218 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

References itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::GetIndex().

template<typename TImage>

Self& itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator++ ( )

Increments the pointers in the ConstNeighborhoodIteratorWithOnlyIndex, wraps across boundaries automatically, accounting for the disparity in the buffer size and the region size of the image.

template<typename TImage>

Self& itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator+= ( const OffsetType & )

Addition of an itk::Offset. Note that this method does not do any bounds checking. Adding an offset that moves the iterator out of its assigned region will produce undefined results.

template<typename TImage>

OffsetType itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator- ( const Self & b )

inline

Distance between two iterators

Definition at line 271 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

References itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::m_Loop.

template<typename TImage>

Self& itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator-- ( )

Decrements the pointers in the ConstNeighborhoodIteratorWithOnlyIndex, wraps across boundaries automatically, accounting for the disparity in the buffer size and the region size of the image.

template<typename TImage>

Self& itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator-= ( const OffsetType & )

Subtraction of an itk::Offset. Note that this method does not do any bounds checking. Subtracting an offset that moves the iterator out of its assigned region will produce undefined results.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator< ( const Self & it ) const

Returns a boolean < comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored. The comparison progresses by dimension starting from the greatest.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator<= ( const Self & it ) const

Returns a boolean <= comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored. The comparison progresses by dimension starting from the greatest.

template<typename TImage>

Self& itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator= ( const Self & orig )

Assignment operator

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator== ( const Self & it ) const

inline

Returns a boolean == comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored.

Definition at line 210 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator> ( const Self & it ) const

Returns a boolean > comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored. The comparison progresses by dimension starting from the greatest.

template<typename TImage>

bool itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::operator>= ( const Self & it ) const

Returns a boolean >= comparison of the current location/index of two ConstNeighborhoodIteratorWithOnlyIndexs of like dimensionality. The radii of the iterators are ignored. The comparison progresses by dimension starting from the greatest.

template<typename TImage>

void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::PrintSelf	(	std::ostream &	,
		Indent
	)		const

overridevirtual

Standard itk print method

Reimplemented from itk::Neighborhood< char, TImage::ImageDimension >.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SetBeginIndex ( const IndexType & start )

inlineprotected

Default method for setting the first index of the iteration region.

Definition at line 331 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SetBound ( const SizeType & )

protected

Virtual method for setting internal loop boundaries. This method must be defined in each subclass because each subclass may handle loop boundaries differently.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SetEndIndex ( )

protected

Default method for setting the last index of the iteration region.

template<typename TImage>

void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SetLocation ( const IndexType & position )

inline

This method positions the iterator at an indexed location in the image. SetLocation should NOT be used to update the position of the iterator during iteration, only for initializing it to a position prior to iteration. This method is not optimized for speed.

Definition at line 255 of file itkConstNeighborhoodIteratorWithOnlyIndex.h.

template<typename TImage>

ITK_ITERATOR_VIRTUAL void itk::ConstNeighborhoodIteratorWithOnlyIndex< TImage >::SetLoop ( const IndexType & p )