/usr/include/InsightToolkit/Numerics/FEM/itkFEMP.h is in libinsighttoolkit3-dev 3.20.1-1.
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Program: Insight Segmentation & Registration Toolkit
Module: itkFEMP.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 __itkFEMP_h
#define __itkFEMP_h
namespace itk {
namespace fem {
/**
* \class FEMP
* \brief Pointer used to store polymorphic elements in STL arrays.
*
* FEMP holds a pointer to objects of class 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.
*/
template<class 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)
{
m_Data=static_cast<T*>(&*x.m_Data->Clone());
}
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()
{
#ifndef FEM_USE_SMART_POINTERS
delete m_Data;
#endif
}
/**
* Asignment operator
*/
const FEMP& operator= (const FEMP &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<class T>
const FEMP<T>& FEMP<T>::operator= (const FEMP &rhs)
{
/** Self assignments don't make sense. */
if (&rhs!=this)
{
/**
* First destroy the existing object on the left hand side
*/
#ifndef FEM_USE_SMART_POINTERS
delete m_Data;
#else
m_Data=0;
#endif
/**
* Then clone the one on the right hand side
* of the expression (if not NULL).
*/
if (rhs.m_Data)
{
m_Data=static_cast<T*>(&*rhs.m_Data->Clone());
}
else
{
m_Data=0;
}
}
return *this;
}
}} // end namespace itk::fem
#endif // #ifndef __itkFEMP_h
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