Singleton模式Linux下的C++實現

Singleton模式是最常用的設計之一，最近結合自己的實際應用，把Singleton作為模板抽象出來（線程安全），權當拋磚引用，歡迎大家提出批評意見，互相交流。下面為源碼，已經編譯運行過。

Singleton 模板類

1. #ifndef _Singleton_h_
2. #define _Singleton_h_
4. #include <pthread.h>
5. class Mutex
6. {
7. public:
8. Mutex()
9. {
10. pthread_mutex_init(&m_lock,NULL);
11. }
13. ~Mutex()
14. {
15. pthread_mutex_destroy(&m_lock);
16. }
18. void Lock()
19. {
20. pthread_mutex_lock(&m_lock);
21. }
23. void UnLock()
24. {
25. pthread_mutex_unlock(&m_lock);
26. }
28. private:
29. pthread_mutex_t m_lock;
30. };
32. template<class T>
33. class Singleton
34. {
35. public:
36. static T* GetInstance();
37. static void Destroy();
38. private:
39. static T* m_pInstance;
40. static Mutex m_mutex;
41. };
43. template<class T>
44. T* Singleton<T>::m_pInstance = 0;
46. template<class T>
47. Mutex Singleton<T>::m_mutex;
49. template<class T>
50. T* Singleton<T>::GetInstance()
51. {
52. if (m_pInstance)
53. {
54. return m_pInstance;
55. }
56. m_mutex.Lock();
57. if (NULL == m_pInstance)
58. {
59. m_pInstance = new T;
60. }
61. m_mutex.UnLock();
62. return m_pInstance;
63. }
65. template<class T>
66. void Singleton<T>::Destroy()
67. {
68. if (m_pInstance)
69. {
70. delete m_pInstance;
71. m_pInstance= NULL;
72. }
73. }
75. #endif