單例模式示例

class Singleton
{
private:
    Singleton() { };
    ~Singleton() { };
    Singleton(const Singleton&);
    Singleton& operator=(const Singleton&);
public:
    static Singleton& getInstance()
        {
        static Singleton instance;
        return instance;
    }
    std::string word="hello from singleton";
    int number;
};

void single_fun(){
    Singleton *ins3=&Singleton::getInstance();
    ins3->number=3565;
}

int main(int argc,char **argv)
{
    single_fun();
    Singleton *ins2=&Singleton::getInstance();
    std::cout<<ins2->number<<endl;

    return 0;
}