1 #pragma once 2 3 /** \class sidle::Singleton 4 \brief Singleton (Double-Checked Locking) 5 \author 吴尔平 6 \version 1.0 7 \date 2005.02.08 - 8 \bug 9 \warning 10 */ 11 12 namespace sidle 13 { 14 using namespace System; 15 using namespace System::Threading; 16 17 template<typename _T> 18 ref class Singleton 19 { 20 public: 21 static _T^ Instance() 22 { 23 if (_instance == nullptr) 24 { 25 _mut->WaitOne(); 26 try 27 { 28 if (_instance == nullptr) 29 { 30 _instance = gcnew _T(); 31 } 32 } 33 finally 34 { 35 _mut->ReleaseMutex(); 36 } 37 } 38 return _instance; 39 } 40 protected: 41 Singleton(){} 42 static _T^ _instance; 43 static Mutex^ _mut = gcnew Mutex(); 44 }; // ref class Singleton 45 46 }; // namespace sidle |