设计模式

1.单例模式https://www.jianshu.com/p/69eef7651667

class SubscInstance
{
private:
    SubscInstance() {};
    ~SubscInstance() {};
public:
    class one
    {
    public:
        one() { CreateSubscInstance(); }
        ~one() { ReleaseSubscInstance(); }
    };
    static one o;
};
SubscInstance::one SubscInstance::o;