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itkWeakPointer.h

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00001 /*========================================================================= 00002 00003 Program: Insight Segmentation & Registration Toolkit 00004 Module: $RCSfile: itkWeakPointer.h,v $ 00005 Language: C++ 00006 Date: $Date: 2003/09/10 14:29:29 $ 00007 Version: $Revision: 1.7 $ 00008 00009 Copyright (c) Insight Software Consortium. All rights reserved. 00010 See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. 00011 00012 This software is distributed WITHOUT ANY WARRANTY; without even 00013 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 00014 PURPOSE. See the above copyright notices for more information. 00015 00016 =========================================================================*/ 00017 #ifndef __itkWeakPointer_h 00018 #define __itkWeakPointer_h 00019 00020 #include "itkMacro.h" 00021 #include <iostream> 00022 00023 namespace itk 00024 { 00025 00042 template <class TObjectType> 00043 class ITK_EXPORT WeakPointer 00044 { 00045 public: 00047 typedef TObjectType ObjectType; 00048 00050 WeakPointer () 00051 { m_Pointer = 0; } 00052 00054 WeakPointer (const WeakPointer<ObjectType> &p): 00055 m_Pointer(p.m_Pointer) { } 00056 00058 WeakPointer (ObjectType *p): 00059 m_Pointer(p) { } 00060 00062 ~WeakPointer () 00063 { m_Pointer = 0; } 00064 00066 ObjectType *operator -> () const 00067 { return m_Pointer; } 00068 00070 operator ObjectType * () const 00071 { return m_Pointer; } 00072 00074 template <typename R> 00075 bool operator == (R r) const 00076 { 00077 return (m_Pointer == (ObjectType*)r); 00078 } 00079 template <typename R> 00080 bool operator != (R r) const 00081 { 00082 return (m_Pointer != (ObjectType*)r); 00083 } 00084 00086 ObjectType *GetPointer () const 00087 { return m_Pointer; } 00088 00090 bool operator < (const WeakPointer &r) 00091 { return (void*)m_Pointer < (void*) r.m_Pointer; } 00092 00094 bool operator > (const WeakPointer &r) 00095 { return (void*)m_Pointer > (void*) r.m_Pointer; } 00096 00098 bool operator <= (const WeakPointer &r) 00099 { return (void*)m_Pointer <= (void*) r.m_Pointer; } 00100 00102 bool operator >= (const WeakPointer &r) 00103 { return (void*)m_Pointer >= (void*) r.m_Pointer; } 00104 00106 WeakPointer &operator = (const WeakPointer &r) 00107 { return this->operator = (r.GetPointer()); } 00108 00110 WeakPointer &operator = (ObjectType *r) 00111 { 00112 m_Pointer = r; 00113 return *this; 00114 } 00115 00117 ObjectType *Print (std::ostream& os) const 00118 { 00119 // This prints the object pointed to by the pointer 00120 (*m_Pointer).Print(os); 00121 return m_Pointer; 00122 } 00123 00124 private: 00126 ObjectType* m_Pointer; 00127 }; 00128 00129 00130 template <typename T> 00131 std::ostream& operator<< (std::ostream& os, WeakPointer<T> p) 00132 { 00133 p.Print(os); 00134 return os; 00135 } 00136 00137 } // end namespace itk 00138 00139 #endif

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