/usr/include/openigtlink/igtlSmartPointer.h is in libopenigtlink-dev 1.10.5-1.
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: The OpenIGTLink Library
Language: C++
Web page: http://openigtlink.org/
Copyright (c) Insight Software Consortium. All rights reserved.
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.
=========================================================================*/
/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkSmartPointer.h,v $
Language: C++
Date: $Date: 2008-12-22 19:05:42 -0500 (Mon, 22 Dec 2008) $
Version: $Revision: 3460 $
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 __igtlSmartPointer_h
#define __igtlSmartPointer_h
#include "igtlMacro.h"
#include <iostream>
namespace igtl
{
/** \class SmartPointer
* \brief Implements transparent reference counting.
*
* SmartPointer implements reference counting by overloading
* operator -> (and *) among others. This allows natural interface
* to the class referred to by the pointer without having to invoke
* special Register()/UnRegister() methods directly.
*
* To compile / test this class
* Windows: cl SmartPointerTest.cxx; .\SmartPointerTest.exe
* linux: c++ SmartPointerTest.cxx ./a.out
* other: CCcompiler SmartPointerTest.cxx ./a.out
*
* \ingroup IGTLSystemObjects
* \ingroup DataAccess
*/
template <class TObjectType>
class IGTL_EXPORT SmartPointer
{
public:
typedef TObjectType ObjectType;
/** Constructor */
SmartPointer ()
{ m_Pointer = 0; }
/** Copy constructor */
SmartPointer (const SmartPointer<ObjectType> &p):
m_Pointer(p.m_Pointer)
{ this->Register(); }
/** Constructor to pointer p */
SmartPointer (ObjectType *p):
m_Pointer(p)
{ this->Register(); }
/** Destructor */
~SmartPointer ()
{
this->UnRegister();
m_Pointer = 0;
}
/** Overload operator -> */
ObjectType *operator -> () const
{ return m_Pointer; }
/** Return pointer to object. */
operator ObjectType * () const
{ return m_Pointer; }
/** Test if the pointer has been initialized */
bool IsNotNull() const
{ return m_Pointer != 0; }
bool IsNull() const
{ return m_Pointer == 0; }
/** Template comparison operators. */
template <typename R>
bool operator == ( R r ) const
{ return (m_Pointer == static_cast<const ObjectType*>(r) ); }
template <typename R>
bool operator != ( R r ) const
{ return (m_Pointer != static_cast<const ObjectType*>(r) ); }
/** Access function to pointer. */
ObjectType *GetPointer () const
{ return m_Pointer; }
/** Comparison of pointers. Less than comparison. */
bool operator < (const SmartPointer &r) const
{ return (void*)m_Pointer < (void*) r.m_Pointer; }
/** Comparison of pointers. Greater than comparison. */
bool operator > (const SmartPointer &r) const
{ return (void*)m_Pointer > (void*) r.m_Pointer; }
/** Comparison of pointers. Less than or equal to comparison. */
bool operator <= (const SmartPointer &r) const
{ return (void*)m_Pointer <= (void*) r.m_Pointer; }
/** Comparison of pointers. Greater than or equal to comparison. */
bool operator >= (const SmartPointer &r) const
{ return (void*)m_Pointer >= (void*) r.m_Pointer; }
/** Overload operator assignment. */
SmartPointer &operator = (const SmartPointer &r)
{ return this->operator = (r.GetPointer()); }
/** Overload operator assignment. */
SmartPointer &operator = (ObjectType *r)
{
if (m_Pointer != r)
{
ObjectType* tmp = m_Pointer; //avoid recursive unregisters by retaining temporarily
m_Pointer = r;
this->Register();
if ( tmp ) { tmp->UnRegister(); }
}
return *this;
}
/** Function to print object pointed to */
ObjectType *Print (std::ostream& os) const
{
// This prints the object pointed to by the pointer
(*m_Pointer).Print(os);
return m_Pointer;
}
private:
/** The pointer to the object referrred to by this smart pointer. */
ObjectType* m_Pointer;
void Register()
{
if(m_Pointer) { m_Pointer->Register(); }
}
void UnRegister()
{
if(m_Pointer) { m_Pointer->UnRegister(); }
}
};
template <typename T>
std::ostream& operator<< (std::ostream& os, SmartPointer<T> p)
{
p.Print(os);
return os;
}
} // end namespace igtl
#endif
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