auto_ptr for singleton pattern

Singleton.h中代码

#ifndef SINGLETON_H_#define SINGLETON_H_#include <memory>class Singleton {private:Singleton();static std::auto_ptr<Singleton> apSingle;public:virtual ~Singleton();void func(); static Singleton& instance();};#endif /* SINGLETON_H_ */ 

Singleton.cpp中实现

#include <iostream>#include <memory>#include "Singleton.h"std::auto_ptr<Singleton> Singleton::apSingle;void Singleton::func(){std::cout << "in func" << std::endl;}Singleton::Singleton(){// TODO Auto-generated constructor stubstd::cout << "in con" << std::endl;}Singleton::~Singleton() {// TODO Auto-generated destructor stubstd::cout << "in decon" << std::endl;}Singleton& Singleton::instance(){if(apSingle.get() == NULL){apSingle.reset(new Singleton());}return *apSingle;}