How to register member functions of other classes as callback functions in ROS2

#include <chrono>
#include <functional>
#include <memory>

#include "geometry_msgs/msg/twist.hpp"
#include "rclcpp/rclcpp.hpp"
#include "sensor_msgs/msg/laser_scan.hpp"

using namespace std::chrono_literals;
using std::placeholders:: _1;

class Sample{
    public:
        Sample(): ranges_size(0){};
        void LaserScanCallback(const sensor_msgs::msg::LaserScan::SharedPtr _msg){
            this->ranges_size = _msg->ranges.size();
            std::cout << this->ranges_size << std::endl;
        }
    private:
        unsigned int ranges_size;
};
class MovingRobot: public rclcpp::Node{
    public:
        MovingRobot(): Node("moving_robot"){
            sample_ptr_ = std::make_shared<Sample>();

            laserscan_subscription_ = this->create_subscription<sensor_msgs::msg::LaserScan>(
                "/scan", rclcpp::QoS(rclcpp::SystemDefaultsQoS()),
                std::bind(&Sample::LaserScanCallback, sample_ptr_.get(), _1));
        }
    private:
        rclcpp::Subscription<sensor_msgs::msg::LaserScan>::SharedPtr laserscan_subscription_;

        std::shared_ptr<Sample> sample_ptr_;
};

int main(int argc, char* argv[]){
    rclcpp::init(argc, argv);
    rclcpp::spin(std::make_shared<MovingRobot>());
    rclcpp::shutdown();

    return 0;
}

핵심은 subscription callback 등록할때 bind 함수에서 this 포인터 대신 클래스의 포인터를 등록