ITK  4.13.0
Insight Segmentation and Registration Toolkit
itkSmartPointerForwardReference.h
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3  * Copyright Insight Software Consortium
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5  * Licensed under the Apache License, Version 2.0 (the "License");
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14  * See the License for the specific language governing permissions and
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18 #ifndef itkSmartPointerForwardReference_h
19 #define itkSmartPointerForwardReference_h
20 
21 #include "itkWeakPointer.h"
22 
23 #include <iostream>
24 
25 namespace itk
26 {
47 template< typename T >
48 class ITK_TEMPLATE_EXPORT SmartPointerForwardReference
49 {
50 public:
53  { m_Pointer = ITK_NULLPTR; }
54 
57 
60 
63 
66 
68  T * operator->() const;
69 
71  operator T *() const;
72 
74  T * GetPointer() const;
75 
77  bool operator<(const SmartPointerForwardReference & r);
78 
80  bool operator>(const SmartPointerForwardReference & r);
81 
83  bool operator<=(const SmartPointerForwardReference & r);
84 
86  bool operator>=(const SmartPointerForwardReference & r);
87 
90 
92  SmartPointerForwardReference & operator=(const WeakPointer< T > & r);
93 
95  SmartPointerForwardReference & operator=(T *r);
96 
98  T * Print(std::ostream & os) const;
99 
100 private:
103 
104  void Register();
105 
106  void UnRegister() ITK_NOEXCEPT;
107 };
108 
109 template< typename T >
110 std::ostream & operator<<(std::ostream & os, SmartPointerForwardReference< T > p)
111 {
112  p.Print(os);
113  return os;
114 }
115 } // end namespace itk
116 
117 #endif
Implements a weak reference to an object.
Implements transparent reference counting in situations where forward references / cyclic include dep...