"Go" C + + Singleton mode

http://blog.csdn.net/hackbuteer1/article/details/7460019

For thread safety and exception security, the following extensions can be made

2. Class Lock
4. {
6. Private
8. CCriticalSection M_cs;
10. Public
12. Lock (CCriticalSection CS): M_cs (CS)
14. {
16. M_cs. Lock ();
18. }
20. ~lock ()
22. {
24. M_cs. Unlock ();
26. }
28. };
32. Class Singleton
34. {
36. Private
38. Singleton ();
40. Singleton (const Singleton &);
42. singleton& operator = (const Singleton &);
46. Public
48. static Singleton *instantialize ();
50. static Singleton *pinstance;
52. Static CCriticalSection CS;
54. };
58. singleton* Singleton::p instance = 0;
62. singleton* singleton::instantialize ()
64. {
66. if (pinstance = = NULL)
68. { //double check
70. Lock Lock (CS); //Use lock for thread safety and resource management classes for exception security
74. //Using the Resource management class, when an exception is thrown, the resource management class object is destroyed, and the destructor always occurs whether the exception is thrown or the statement block ends.
76. if (pinstance = = NULL)
78. {
80. Pinstance = new Singleton ();
82. }
84. } ---//my Note: The Lock class here is a local variable, which is then refactored, which will be unlocked.
86. return pinstance;
88. }

"Go" C + + Singleton mode