#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; 
}; 
 
//初始化創(chuàng)建 后續(xù)在多線程中使用 
//還有另一種寫法是單獨的函數(shù)直接返回內(nèi)部單例包裝靜態(tài)成員在 多線程情況下不安全 
//SingletonFactory::CreateSingletonFactory().GetInstance(); 
template<class T> SingletonFactory<T>* SingletonFactory<T>::CreateSingletonFactory(){ 
  static SingletonFactory<T> temObj; 
  return &temObj; 
} 
//工廠實例 
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;