/usr/include/ITK-4.5/itkFEMP.h is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
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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 __itkFEMP_h
#define __itkFEMP_h
#include <iostream>
namespace itk
{
namespace fem
{
/**
* \class FEMP
* \brief Pointer used to store polymorphic elements in STL arrays.
*
* FEMP holds a pointer to objects of typename T and its derived classes. it
* behaves like a special kind of pointer. Special pointers to object can
* be used to store polymorphic arrays in STL. The basic idea of the special
* pointer is: whatever you do to the pointer (object of class FEMP), is
* also reflected on the object within (pointed to by m_Data member). For
* example: if you copy the special pointer, an object within is also copied.
*
* Class T should have a member Clone() which produces a copy of an object.
* This is important in polymorphic classes, where object of the derived
* class should be created when copying an existing object.
*
* Class T should also include typedefs T::Pointer and T::ConstPointer that
* define standard pointers to the class. Note that these could be
* SmartPointer classes.
* \ingroup ITKFEM
*/
template <typename T>
class FEMP
{
public:
/**
* Default constructor makes sure that m_Data is 0,
* to prevent problems when deleting m_Data object
* on destruction.
*/
FEMP() : m_Data(0)
{
}
/**
* Copy constructor. Clone() method is called
* to duplicate the existing object.
*/
FEMP(const FEMP & x)
{
if( x.m_Data )
{
#ifdef USE_FEM_CLONE
m_Data = static_cast<T *>( x.m_Data->Clone().GetPointer() );
#else
std::cout << "Create Another" << std::endl;
m_Data = static_cast<T *>( x.m_Data->CreateAnother().GetPointer() );
#endif
}
else
{
m_Data = 0;
}
}
/**
* Conversion constructor from T::Pointer to FEMP<T>.
* The object T* must exist and we take ownership of object T*.
* If you want to create a copy of object and take ownership of that,
* use: FEMP(x->Clone()) instead of FEMP(x).
*/
explicit FEMP(typename T::Pointer x) : m_Data(x)
{
}
/**
* Destructor of a special pointer class also destroys the actual object.
*/
~FEMP()
{
m_Data = 0;
}
/**
* Asignment operator
*/
const FEMP<T> & operator=(const FEMP<T> & rhs);
/**
* Easy access to members of stored object
*/
typename T::Pointer operator->() const
{
return m_Data;
}
/**
* Dereferencing operator provides automatic conversion from
* special to standard pointer to object
*/
operator T *() const
{
return m_Data;
}
/**
* Return true if special pointer actually points
* to a valid object and false otherwise.
*/
bool IsNULL() const
{
return m_Data == 0;
}
private:
/**
* Pointer to actual object. Note that this could be a SmartPointer.
*/
typename T::Pointer m_Data;
};
template <typename T>
const FEMP<T> & FEMP<T>::operator=(const FEMP<T> & rhs)
{
/** Self assignments don't make sense. */
if( &rhs != this )
{
/**
* First destroy the existing object on the left hand side
*/
m_Data = 0;
/**
* Then clone the one on the right hand side
* of the expression (if not NULL).
*/
if( rhs.m_Data )
{
#ifdef USE_FEM_CLONE
m_Data = static_cast<T *>( rhs.m_Data->Clone().GetPointer() );
#else
m_Data = static_cast<T *>( rhs.m_Data->CreateAnother().GetPointer() );
#endif
}
else
{
m_Data = 0;
}
}
return *this;
}
}
} // end namespace itk::fem
#endif // #ifndef __itkFEMP_h
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