/usr/include/ITK-4.5/itkPreOrderTreeIterator.h is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkPreOrderTreeIterator_h
#define __itkPreOrderTreeIterator_h
#include "itkTreeIteratorBase.h"
namespace itk
{
template< typename TTreeType >
class LeafTreeIterator;
template< typename TTreeType >
class PreOrderTreeIterator:public TreeIteratorBase< TTreeType >
{
public:
/** Typedefs */
typedef typename TTreeType::ValueType ValueType;
typedef TreeIteratorBase< TTreeType > Superclass;
typedef typename Superclass::TreeNodeType TreeNodeType;
typedef typename Superclass::NodeType NodeType;
/** Constructor */
PreOrderTreeIterator(const TTreeType *tree, const TreeNodeType *start = NULL);
/** Get the type of the iterator */
NodeType 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;
private:
/** Find the next node */
const TreeNodeType * FindNextNode() const;
/** LeafTreeIterator uses PreOrderTreeIterator in its implementation, but it
* needs to adjust its root. A friend designation is added to correct
* behavior and retain backwards compatible behavior. */
friend class LeafTreeIterator< TTreeType >;
};
/** Constructor */
template< typename TTreeType >
PreOrderTreeIterator< TTreeType >::PreOrderTreeIterator(const TTreeType *tree, const TreeNodeType *start):
TreeIteratorBase< TTreeType >(tree, start)
{}
/** Return the type of the iterator */
template< typename TTreeType >
typename PreOrderTreeIterator< TTreeType >::NodeType
PreOrderTreeIterator< TTreeType >::GetType() const
{
return TreeIteratorBase< TTreeType >::PREORDER;
}
/** Return true if the next node exists */
template< typename TTreeType >
bool
PreOrderTreeIterator< TTreeType >::HasNext() const
{
if ( const_cast< TreeNodeType * >( FindNextNode() ) != NULL )
{
return true;
}
return false;
}
/** Return the next node */
template< typename TTreeType >
const typename PreOrderTreeIterator< TTreeType >::ValueType &
PreOrderTreeIterator< TTreeType >::Next()
{
this->m_Position = const_cast< TreeNodeType * >( FindNextNode() );
return this->m_Position->Get();
}
/** Find the next node */
template< typename TTreeType >
const typename PreOrderTreeIterator< TTreeType >::TreeNodeType *
PreOrderTreeIterator< TTreeType >::FindNextNode() const
{
if ( this->m_Position == NULL )
{
return NULL;
}
if ( this->m_Position->HasChildren() )
{
return dynamic_cast< const TreeNodeType * >( this->m_Position->GetChild(0) );
}
if ( !this->m_Position->HasParent() )
{
return NULL;
}
TreeNodeType *child = this->m_Position;
TreeNodeType *parent = dynamic_cast< TreeNodeType * >( this->m_Position->GetParent() );
// Are we a subtree? Then we are done.
if ( parent && parent->ChildPosition(this->m_Root) >= 0 )
{
return NULL;
}
int childPosition = parent->ChildPosition(child);
int lastChildPosition = parent->CountChildren() - 1;
while ( childPosition < lastChildPosition )
{
TreeNodeType *help = dynamic_cast< TreeNodeType * >( parent->GetChild(childPosition + 1) );
if ( help != NULL )
{
return help;
}
childPosition++;
}
while ( parent->HasParent() )
{
child = parent;
parent = dynamic_cast< TreeNodeType * >( parent->GetParent() );
// Subtree
if ( parent->ChildPosition(this->m_Root) >= 0 )
{
return NULL;
}
childPosition = parent->ChildPosition(child);
lastChildPosition = parent->CountChildren() - 1;
while ( childPosition < lastChildPosition )
{
TreeNodeType *help = dynamic_cast< TreeNodeType * >( parent->GetChild(childPosition + 1) );
if ( help != NULL )
{
return help;
}
}
}
return NULL;
}
/** Clone function */
template< typename TTreeType >
TreeIteratorBase< TTreeType > *PreOrderTreeIterator< TTreeType >::Clone()
{
PreOrderTreeIterator< TTreeType > *clone = new PreOrderTreeIterator< TTreeType >(this->m_Tree, this->m_Position);
*clone = *this;
return clone;
}
} // end namespace itk
#endif
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