/usr/include/InsightToolkit/Common/itkWeakPointer.h is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | /*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkWeakPointer.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 __itkWeakPointer_h
#define __itkWeakPointer_h
#include "itkMacro.h"
#include <iostream>
namespace itk
{
/** \class WeakPointer
* \brief Implements a weak reference to an object.
*
* WeakPointer implements a weak reference to an object. A natural
* interface to the class is defined by operator -> (and *) among others.
* WeakPointer is really nothing more than a standard pointer. It is used
* to call attention to the fact that it does not adjust the reference
* count of an object like SmartPointer does. WeakPointer is used internally
* to Insight to manage (break) reference counting loops. At some point,
* an object may keep track of how many objects hold weak references to
* itself. In all cases, however, an outstanding weak reference will not
* keep an object from destructing.
*
* \ingroup ITKSystemObjects
* \ingroup DataAccess
*/
template <class TObjectType>
class ITK_EXPORT WeakPointer
{
public:
/** Extract information from template parameter. */
typedef TObjectType ObjectType;
/** Constructor. */
WeakPointer ()
{ m_Pointer = 0; }
/** Copy constructor. */
WeakPointer (const WeakPointer<ObjectType> &p): m_Pointer(p.m_Pointer) {}
/** Constructor to pointer p. */
WeakPointer (ObjectType *p): m_Pointer(p) { }
/** Destructor. */
~WeakPointer ()
{ m_Pointer = 0; }
/** Overload operator ->. */
ObjectType *operator -> () const
{ return m_Pointer; }
/** Return pointer to object. */
operator ObjectType * () const
{ return m_Pointer; }
/** Template comparison operators. */
template <typename R>
bool operator == (R r) const
{
return (m_Pointer == (ObjectType*)r);
}
template <typename R>
bool operator != (R r) const
{
return (m_Pointer != (ObjectType*)r);
}
/** Access function to pointer. */
ObjectType *GetPointer () const
{ return m_Pointer; }
/** Comparison of pointers. Less than comparison. */
bool operator < (const WeakPointer &r) const
{ return (void*)m_Pointer < (void*) r.m_Pointer; }
/** Comparison of pointers. Greater than comparison. */
bool operator > (const WeakPointer &r) const
{ return (void*)m_Pointer > (void*) r.m_Pointer; }
/** Comparison of pointers. Less than or equal to comparison. */
bool operator <= (const WeakPointer &r) const
{ return (void*)m_Pointer <= (void*) r.m_Pointer; }
/** Comparison of pointers. Greater than or equal to comparison. */
bool operator >= (const WeakPointer &r) const
{ return (void*)m_Pointer >= (void*) r.m_Pointer; }
/** Overload operator assignment. */
WeakPointer &operator = (const WeakPointer &r)
{ return this->operator = (r.GetPointer()); }
/** Overload operator assignment. */
WeakPointer &operator = (ObjectType *r)
{
m_Pointer = r;
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;
};
template <typename T>
std::ostream& operator<< (std::ostream& os, WeakPointer<T> p)
{
p.Print(os);
return os;
}
} // end namespace itk
#endif
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