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gdcmSmartPointer.h
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1 /*=========================================================================
2
3 Program: GDCM (Grassroots DICOM). A DICOM library
4
5 Copyright (c) 2006-2011 Mathieu Malaterre
6 All rights reserved.
7 See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
8
9 This software is distributed WITHOUT ANY WARRANTY; without even
10 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
11 PURPOSE. See the above copyright notice for more information.
12
13 =========================================================================*/
14 #ifndef GDCMSMARTPOINTER_H
15 #define GDCMSMARTPOINTER_H
16
17 #include "gdcmObject.h"
18
19 namespace gdcm
20 {
38 template<class ObjectType>
39 class SmartPointer
40 {
41 public:
42 SmartPointer():Pointer(0) {}
43 SmartPointer(const SmartPointer<ObjectType>& p):Pointer(p.Pointer)
44 { Register(); }
45 SmartPointer(ObjectType* p):Pointer(p)
46 { Register(); }
47 SmartPointer(ObjectType const & p)
48 {
49 Pointer = const_cast<ObjectType*>(&p);
50 Register();
51 }
52 ~SmartPointer() {
53 UnRegister();
54 Pointer = 0;
55 }
56
58 ObjectType *operator -> () const
59 { return Pointer; }
60
61 ObjectType& operator * () const
62 { return *Pointer; }
63
65 operator ObjectType * () const
66 { return Pointer; }
67
69 SmartPointer &operator = (SmartPointer const &r)
70 { return operator = (r.Pointer); }
71
73 SmartPointer &operator = (ObjectType *r)
74 {
75 // http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.22
76 // DO NOT CHANGE THE ORDER OF THESE STATEMENTS!
77 // (This order properly handles self-assignment)
78 // (This order also properly handles recursion, e.g., if a ObjectType contains SmartPointer<ObjectType>s)
79 if( Pointer != r )
80 {
81 ObjectType* old = Pointer;
82 Pointer = r;
83 Register();
84 if ( old ) { old->UnRegister(); }
85 }
86 return *this;
87 }
88
89 SmartPointer &operator = (ObjectType const &r)
90 {
91 ObjectType* tmp = const_cast<ObjectType*>(&r);
92 return operator = (tmp);
93 }
94
96 ObjectType *GetPointer() const
97 { return Pointer; }
98
99 private:
100 void Register()
101 {
102 if(Pointer) Pointer->Register();
103 }
104
105 void UnRegister()
106 {
107 if(Pointer) Pointer->UnRegister();
108 }
109
110 ObjectType* Pointer;
111 };
112
113 } // end namespace gdcm
114
115 #endif //GDCMSMARTPOINTER_H