GDCM: gdcmSmartPointer.h Source File

GDCM 3.0.25

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
19namespace gdcm
20{
38template<class ObjectType>
39 class SmartPointer
40{
41public:
42 SmartPointer():Pointer(nullptr) {}
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 = nullptr;
55 }
56
58 ObjectType *operator -> () const
59 { return Pointer; }
60
61 ObjectType& operator * () const
62 {
63 assert( Pointer );
64 return *Pointer;
65 }
66
68 operator ObjectType * () const
69 { return Pointer; }
70
72 SmartPointer &operator = (SmartPointer const &r)
73 { return operator = (r.Pointer); }
74
76 SmartPointer &operator = (ObjectType *r)
77 {
78 // http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.22
79 // DO NOT CHANGE THE ORDER OF THESE STATEMENTS!
80 // (This order properly handles self-assignment)
81 // (This order also properly handles recursion, e.g., if a ObjectType contains SmartPointer<ObjectType>s)
82 if( Pointer != r )
83 {
84 ObjectType* old = Pointer;
85 Pointer = r;
86 Register();
87 if ( old ) { old->UnRegister(); }
88 }
89 return *this;
90 }
91
92 SmartPointer &operator = (ObjectType const &r)
93 {
94 ObjectType* tmp = const_cast<ObjectType*>(&r);
95 return operator = (tmp);
96 }
97
99 ObjectType *GetPointer() const
100 { return Pointer; }
101
102private:
103 void Register()
104 {
105 if(Pointer) Pointer->Register();
106 }
107
108 void UnRegister()
109 {
110 if(Pointer) Pointer->UnRegister();
111 }
112
113 ObjectType* Pointer;
114};
115
116} // end namespace gdcm
117
118#endif //GDCMSMARTPOINTER_H
gdcm::SmartPointer::operator*
ObjectType & operator*() const
Definition gdcmSmartPointer.h:61
gdcm::SmartPointer::SmartPointer
SmartPointer()
Definition gdcmSmartPointer.h:42
gdcm::SmartPointer::operator=
SmartPointer & operator=(SmartPointer const &r)
Overload operator assignment.
Definition gdcmSmartPointer.h:72
gdcm::SmartPointer::SmartPointer
SmartPointer(const SmartPointer< ObjectType > &p)
Definition gdcmSmartPointer.h:43
gdcm::SmartPointer::~SmartPointer
~SmartPointer()
Definition gdcmSmartPointer.h:52
gdcm::SmartPointer::operator->
ObjectType * operator->() const
Overload operator ->
Definition gdcmSmartPointer.h:58
gdcm::SmartPointer::SmartPointer
SmartPointer(ObjectType *p)
Definition gdcmSmartPointer.h:45
gdcm::SmartPointer::GetPointer
ObjectType * GetPointer() const
Explicit function to retrieve the pointer.
Definition gdcmSmartPointer.h:99
gdcm::SmartPointer::SmartPointer
SmartPointer(ObjectType const &p)
Definition gdcmSmartPointer.h:47
gdcmObject.h
gdcm
Definition gdcmASN1.h:21