libev的c++使用

class IOEvent
{
public:
    void operator()(ev::io &w, int revents)
    {
        if (revents & ev::READ)
            ReadEvent(w.fd);
        if (revents & ev::WRITE)
            WriteEvent(w.fd);
    }

protected:
    IOEvent(int fd, struct ev_loop *lp)
    {
        _io.set(this);
        _io.set(lp);
        _io.start(fd, ev::NONE);
    }
    virtual ~IOEvent()
    {
        _io.stop();
        close(_io.fd);
    }
    void SetEvents(int events)
    {
        _io.set(events);
    }

private:
    ev::io _io;

    virtual void ReadEvent(int fd) = 0;
    virtual void WriteEvent(int fd) = 0;
};

class UDPEvent : private IOEvent
{
public:
    UDPEvent(int fd, struct ev_loop *lp) : IOEvent(fd, lp)
    {
        SetEvents(ev::READ);
    }

private:
    virtual void ReadEvent(int fd)
    {
    }
    virtual void WriteEvent(int fd)
    {
    }
}