设计模式之单例模式

 1 #include<iostream>
 2 
 3 class A
 4 {
 5 public:
 6     int a;
 7     int b;
 8     int c;
 9     static A * Instance;
10     static A* getInstance()
11     {
12         if (!Instance)
13         {
14             Instance = new A;
15         }
16         return Instance;
17     }
18 };
19 
20 A * A::Instance = NULL;
21 
22 void funct()
23 {
24     A *bb = A::getInstance();
25     std::cout << bb->a << std::endl;
26 
27     std::cout << bb->b << std::endl;
28 
29     std::cout << bb->c << std::endl;
30 }
31 
32 
33 int main(int argc,char *argv[])
34 {
35     A *aa = A::getInstance();
36     aa->a = 1;
37     aa->b = 3;
38     aa->c = 5;
39     funct();
40 
41     std::cin.get();
42     return 0;
43 }