C++实现一个线程安全的单例工厂实现代码

#ifndef SINGLETONFACTORY_H #define SINGLETONFACTORY_H #include "windows.h" #include <memory> namespace Tools { template<class T>class SingletonFactory { public:   virtual ~SingletonFactory()   {    ::DeleteCriticalSection(&__criticalSection);   }   std::auto_ptr<T>& GetInstance();   static SingletonFactory<T>* CreateSingletonFactory(); private:   SingletonFactory()   {     ::InitializeCriticalSection(&__criticalSection);   }   std::auto_ptr<T> __singletonObj;   CRITICAL_SECTION __criticalSection; };  //初始化创建 后续在多线程中使用 //还有另一种写法是单独的函数直接返回内部单例包装静态成员在 多线程情况下不安全 //SingletonFactory::CreateSingletonFactory().GetInstance(); template<class T> SingletonFactory<T>* SingletonFactory<T>::CreateSingletonFactory(){   static SingletonFactory<T> temObj;   return &temObj; } //工厂实例 template<class T> std::auto_ptr<T>& SingletonFactory<T>::GetInstance() {   if(__singletonObj.get()==0)   {     ::EnterCriticalSection(&__criticalSection);     if(__singletonObj.get()==0)       __singletonObj=std::auto_ptr<T>(new T);     ::LeaveCriticalSection(&__criticalSection);   }   return __singletonObj; } }  #endif // SINGLETONFACTORY_H 

SingletonFactory<Data1>*singleton1=SingletonFactory<Data1>::CreateSingletonFactory(); singleton1->GetInstance()->x=100; cout<<singleton1->GetInstance()->x<<endl; singleton1->GetInstance()->y=200; cout<<singleton1->GetInstance()->x<<endl; cout<<singleton1->GetInstance()->y<<endl;  SingletonFactory<Data2>*singleton2=SingletonFactory<Data2>::CreateSingletonFactory(); singleton2->GetInstance()->x=100; cout<<singleton2->GetInstance()->x<<endl; singleton2->GetInstance()->y=200; cout<<singleton2->GetInstance()->x<<endl; cout<<singleton2->GetInstance()->y<<endl;