C++单例模式

01 //单例模式
02 //main.cc
03 #include "Single.h"
04 
05 #include <iostream>
06 using namespace std;
07 
08 int main(int argc, char *argv[])
09 {
10     Single::GetInstance();
11     Single::GetInstance();
12     return 0;
13 }
14 
15 //Single.h
16 class Single
17 {
18 public:
19     static Single &GetInstance();
20 private:
21     Single();
22     Single(const Single &);
23     Single &operator = (const Single &);
24 };
25 
26 //Single.cpp
27 #include "Single.h"
28 
29 #include <iostream>
30 
31 using namespace std;
32 
33 Single &Single::GetInstance()
34 {
35     static Single instance;
36     return instance;
37 }
38 
39 Single::Single()
40 {
41     cout<<"Hello,this your world!" <<endl;
42 }
43 
44 虽然 main 函数中调用了两次 Single::GetInstance();
45 但只有一次 “Hello,this your world!”的输出，也就是单例模式成功了！
46 
47 
48 //其它的实现方式！
49 #include <iostream>
50 
51 using namespace std;
52 
53 class Single
54 {
55 private:
56     Single();
57     virtual ~Single();
58     static Single *instance;
59 
60 public:
61     static Single *GetInstance();
62 };
63 
64 Single::Single()
65 {
66     cout<<"Hello,this your world!" <<endl;
67 }
68 
69 Single::~Single()
70 {
71     delete instance;
72 }
73 
74 Single *Single::instance = new Single();
75 Single *Single::GetInstance()
76 {             www.zzzyk.com
77     return instance;
78 }
79 
80 int main(int argc, char *argv[])
81 {
82     Single *single1 = Single::GetInstance();
83     Single *single2 = Single::GetInstance();
84 
85     return 0;
86 }

补充：软件开发 , C++ ,

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