设计模式——单例设计模式（C++实现）

 1 #ifndef  SINGLETONHOLDER_INC
 2 #define  SINGLETONHOLDER_INC
 3 
 4 template<class T>
 5 class SingletonHolder
 6 {
 7 public:
 8     static T* Instance()
 9     {
10         if(!pInstance_)
11             pInstance_=new T;
12         return pInstance_;
13     }
14 private:
15     SingletonHolder(){};
16     SingletonHolder(const SingletonHolder&);
17     SingletonHolder& operator=(const SingletonHolder&);
18     ~SingletonHolder(){};
19     static T* pInstance_;
20 };
21 
22 template<class T>
23 T* SingletonHolder<T>::pInstance_=0;
24 
25 
26 #endif
27 
28 
29 #ifndef INS
30 #define INS SingletonHolder<CGlobal>::Instance()
31 #endif