小编j_0*_*101的帖子

请问有人能告诉我这个操作符在C++函数中的功能吗？

class simplecanny
{
    ros::NodeHandle nh_;
    ros::NodeHandle n;
    ros::Publisher pub ;
    image_transport::ImageTransport it_;    
    image_transport::Subscriber image_sub_; //image subscriber 
    image_transport::Publisher image_pub_; //image publisher(we subscribe to ardrone image_raw)
    std_msgs::String msg;
    public:
    *** simplecanny()
        : it_(nh_) ***
    {
        image_sub_ = it_.subscribe("/ardrone/image_raw", 1, &simplecanny::imageCb, this);
        image_pub_= it_.advertise("/arcv/Image",1); 
    }

    ~simplecanny()
    {
        cv::destroyWindow(WINDOW);
    }

    ...

在simplecanny() : it_(nh_)构造函数中,我不熟悉该: it_(nh_)部分.它有什么作用？这是运算符重载的情况吗？

提前致谢!