/usr/include/InsightToolkit/Common/itkPostOrderTreeIterator.h is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Program: Insight Segmentation & Registration Toolkit
Module: itkPostOrderTreeIterator.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkPostOrderTreeIterator_h
#define __itkPostOrderTreeIterator_h
#include <itkTreeIteratorBase.h>
namespace itk {
template <class TTreeType>
class PostOrderTreeIterator : public TreeIteratorBase<TTreeType>
{
public:
/** Typedefs */
typedef PostOrderTreeIterator Self;
typedef TreeIteratorBase<TTreeType> Superclass;
typedef TTreeType TreeType;
typedef typename TTreeType::ValueType ValueType;
typedef typename Superclass::TreeNodeType TreeNodeType;
/** Constructor */
PostOrderTreeIterator(TreeType* tree);
/** Get the type of the iterator */
int GetType() const;
/** Clone function */
TreeIteratorBase<TTreeType>* Clone();
protected:
/** Return the next node */
const ValueType& Next();
/** Return true if the next node exists */
bool HasNext() const;
protected:
const TreeNodeType* FindNextNode() const;
const TreeNodeType* FindMostRightLeaf(TreeNodeType* node) const;
const TreeNodeType* FindSister(TreeNodeType* node) const;
};
/** Constructor */
template <class TTreeType>
PostOrderTreeIterator<TTreeType>::PostOrderTreeIterator( TTreeType* tree)
:TreeIteratorBase<TTreeType>(tree,NULL)
{
this->m_Position = const_cast<TreeNode<ValueType>*>(tree->GetRoot());
if ( this->m_Position == NULL )
{
this->m_Begin = NULL;
}
else
{
this->m_Position =const_cast<TreeNodeType* >(FindMostRightLeaf(this->m_Position));
this->m_Begin = this->m_Position;
}
}
/** Return the type of the iterator */
template <class TTreeType>
int
PostOrderTreeIterator<TTreeType>::GetType() const
{
return TreeIteratorBase<TTreeType>::POSTORDER;
}
/** Return true if the next node exists */
template <class TTreeType>
bool
PostOrderTreeIterator<TTreeType>::HasNext() const
{
if(const_cast<TreeNodeType* >(FindNextNode()) != NULL)
{
return true;
}
return false;
}
/** Go to the next node */
template <class TTreeType>
const typename PostOrderTreeIterator<TTreeType>::ValueType&
PostOrderTreeIterator<TTreeType>::Next()
{
this->m_Position = const_cast<TreeNodeType*>(FindNextNode());
return this->m_Position->Get();
}
/** Find the next node */
template <class TTreeType>
const typename PostOrderTreeIterator<TTreeType>::TreeNodeType*
PostOrderTreeIterator<TTreeType>::FindNextNode() const
{
if ( this->m_Position == NULL || this->m_Position == this->m_Root )
{
return NULL;
}
TreeNodeType* sister = const_cast<TreeNodeType*>(FindSister( this->m_Position ));
if ( sister != NULL )
{
return FindMostRightLeaf( sister );
}
return this->m_Position->GetParent();
}
/** Find the sister node */
template <class TTreeType>
const typename PostOrderTreeIterator<TTreeType>::TreeNodeType*
PostOrderTreeIterator<TTreeType>::FindSister( TreeNodeType* node ) const
{
if ( !node->HasParent() )
{
return NULL;
}
TreeNodeType* parent = node->GetParent();
int childPosition = parent->ChildPosition( node );
int lastChildPosition = parent->CountChildren() - 1;
while ( childPosition < lastChildPosition )
{
TreeNodeType* sister = parent->GetChild( childPosition + 1);
if ( sister != NULL )
{
return sister;
}
childPosition++;
}
return NULL;
}
/** Find the most right leaf */
template <class TTreeType>
const typename PostOrderTreeIterator<TTreeType>::TreeNodeType*
PostOrderTreeIterator<TTreeType>::FindMostRightLeaf(TreeNodeType* node) const
{
while ( node->HasChildren() )
{
TreeNodeType* helpNode;
int childCount = node->CountChildren();
int i = 0;
do
{
helpNode = node->GetChild( i );
i++;
}
while ( helpNode == NULL && i < childCount );
if ( helpNode == NULL )
{
return node;
}
node = helpNode;
}
return node;
}
/** Clone function */
template <class TTreeType>
TreeIteratorBase<TTreeType>* PostOrderTreeIterator<TTreeType>::Clone()
{
PostOrderTreeIterator<TTreeType>* clone = new PostOrderTreeIterator<TTreeType>( const_cast<TTreeType*>(this->m_Tree) );
*clone = *this;
return clone;
}
} // end namespace itk
#endif
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