//资源保护对象

class CAutoLock
{
public:
 CAutoLock(){ ::InitializeCriticalSection(&m_crit);}
 virtual ~CAutoLock() { ::DeleteCriticalSection(&m_crit); }
public:
 void  Lock(){  ::EnterCriticalSection(&m_crit); }
 void  UnLock(){ ::LeaveCriticalSection(&m_crit); }
private:
 CRITICAL_SECTION  m_crit;
};
template <class T>
class SingleTon
{
public:
 SingleTon(){};
 ~SingleTon(){ if( instance_ ) delete instance_; }
public:
 static T* get_instance()
 {
  if( instance_ == 0 )
  {
   lock_.Lock();
   try
   {
    if( instance_ == 0 )
     instance_ = new T;
   }
   catch (...)
   {

   }
   lock_.UnLock();
  }

  return instance_;
 }

protected:
 static CAutoLock lock_ ;
 static T* instance_;
};

template <class T>
CAutoLock SingleTon<T>::lock_;
template<class T>
T* SingleTon<T>::instance_;