One simple counted object pointer

 

 1 template <class T>
 2  class Pointer
 3 {
 4 protected:
 5     unsigned *ptrCount;
 6     T *ptrObject;
 7 
 8     void ptrDetach(void)
 9     {
10         if(ptrCount && --(*ptrCount)==0) {
11             delete ptrObject;
12             delete ptrCount;
13         }
14         ptrObject = NULL;
15         ptrCount = NULL;
16     }
17 
18 public:
19     explicit Pointer(T* ptr = NULL) : ptrObject(ptr)
20     {
21         ptrCount = new unsigned;
22         *ptrCount = 1;
23     }
24 
25     Pointer(const Pointer<T> &ref)
26     {
27         ptrObject = ref.ptrObject;
28         ptrCount = ref.ptrCount;
29         ++(*ptrCount);
30     }
31 
32     inline virtual ~Pointer()
33         {ptrDetach();}
34 
35 
36     Pointer& operator=(const Pointer<T> &ref)
37     {
38         if(this != &ref) {
39             ptrDetach();
40             ptrObject = ref.ptrObject;
41             ptrCount = ref.ptrCount;
42             ++(*ptrCount);
43         }
44         return *this;
45     }
46 
47     inline T& operator*() const
48         {return *ptrObject;};
49 
50     inline T* getObject() const
51         {return ptrObject;};
52 
53     inline T* operator->() const
54         {return ptrObject;};
55 
56     inline bool operator!() const
57         {return (*ptrCount == 1);};
58 
59     inline int operator++() const
60         {return ++(*ptrCount);};
61 
62     int operator--() const
63     {
64         if(*ptrCount == 1) {
65             delete this;
66             return 0;
67         }
68         return --(*ptrCount);
69     }
70 };

 

 

posted @ 2010-10-17 15:22  Zero Lee  阅读(230)  评论(0)    收藏  举报