Calling a function in a function

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Hi, can help me to check what is my mistake in the following code please? I did try to refer to http://wiki.ros.org/roscpp_tutorials/Tutorials/UsingClassMethodsAsCallbacks but fail. Thank you.

#include "ros/ros.h"
#include <visualization_msgs/Marker.h>
#include <pcl/ros/conversions.h>
#include <pcl/point_cloud.h>
#include <pcl/point_types.h>
#include <pcl/filters/voxel_grid.h>
#include <pcl_ros/point_cloud.h>

ros::Subscriber sub_;
ros::Publisher markerpub_;

    class Listener{
      public:
        double publishBbox();
      };

    void cloudcb(const PointCloud::ConstPtr&  cloud){
        publishBbox();
    }

    double Listener::publishBbox(){
        double x = (min_x_ + max_x_)/2;
        double y = (min_y_ + max_y_)/2;
        double z = (0 + max_z_)/2;

        double scale_x = (max_x_ - x)*2;
        double scale_y = (max_y_ - y)*2;
        double scale_z = (max_z_ - z)*2;

        visualization_msgs::Marker marker;
        marker.header.frame_id = "/camera_rgb_optical_frame";
        marker.header.stamp = ros::Time();
        marker.ns = "my_namespace";
        marker.id = 1;
        marker.type = visualization_msgs::Marker::CUBE;
        marker.action = visualization_msgs::Marker::ADD;
        marker.pose.position.x = x;
        marker.pose.position.y = -y;
        marker.pose.position.z = z;
        marker.pose.orientation.x = 0.0;
        marker.pose.orientation.y = 0.0;
        marker.pose.orientation.z = 0.0;
        marker.pose.orientation.w = 1.0;
        marker.scale.x = scale_x;
        marker.scale.y = scale_y;
        marker.scale.z = scale_z;
        marker.color.a = 0.5;
        marker.color.r = 0.0;
        marker.color.g = 1.0;
        marker.color.b = 0.0;
        //only if using a MESH_RESOURCE marker type:
        bboxpub_.publish( marker );
    }

    int main(int argc, char** argv){
        ros::init(argc, argv, "my_tf_broadcaster");

        ros::NodeHandle nh;

        sub_= nh.subscribe("camera/depth/points", 1, cloudcb);  
        Listener bbox;
        bboxpub_ = nh.advertise<visualization_msgs::Marker>("bbox",1, &Listener::publishBbox, &bbox);

        ros::spin();
        return 0;
    };