auto_ptr for singleton pattern

 1 #ifndef SINGLETON_H_  
 2 #define SINGLETON_H_  
 3 #include <memory>  
 4 class Singleton {  
 5 private:  
 6     Singleton();  
 7     static std::auto_ptr<Singleton> apSingle;  
 8 public:  
 9     virtual ~Singleton();  
10     void func();  
11     static Singleton& instance();  
12 };  
13 #endif /* SINGLETON_H_ */ 

 1 #include <iostream>  
 2 #include <memory>  
 3 #include "Singleton.h"  
 4 std::auto_ptr<Singleton> Singleton::apSingle;  
 5 void Singleton::func(){  
 6     std::cout << "in func" << std::endl;  
 7 }  
 8 Singleton::Singleton(){  
 9     // TODO Auto-generated constructor stub  
10     std::cout << "in con" << std::endl;  
11 }  
12 Singleton::~Singleton() {  
13     // TODO Auto-generated destructor stub  
14     std::cout << "in decon" << std::endl;  
15 }  
16 Singleton& Singleton::instance(){  
17     if(apSingle.get() == NULL){  
18         apSingle.reset(new Singleton());  
19     }  
20     return *apSingle;  
21 }