C++ 单例模式的实现

#include <memory>
#include <iostream>

using namespace std;


class Singleton
{
public:
static Singleton* GetInstance()
{
if (instacne_.get() == NULL)
{
instacne_ = auto_ptr<Singleton>(new Singleton);
}
return instacne_.get();
}


~Singleton()
{
cout<<"~Singleton ..."<<endl;
}
private:
Singleton(const Singleton& other);
Singleton& operator=(const Singleton& other);
Singleton()
{
cout<<"Singleton ..."<<endl;
}
static auto_ptr<Singleton> instacne_;
};


auto_ptr<Singleton> Singleton::instacne_;


void test()
{
Singleton* s1 = Singleton::GetInstance();
Singleton* s2 = Singleton::GetInstance();
}


int main(void)
{

test();

cout<<"......."<<endl;

return 0;
}