Question about implement class to handle callback for subscriber

edit

This question relates to my previous question in this post: http://answers.ros.org/question/22906... Since I accepted the answer so I guess I should make a new question here about implement my solution. If creating a second question is wrong please let me know how to do it properly

Thanks from Stefan's answer, I try to implement the class to store pose information from callback. I defined this class as follow but it has an error. Since I don't have much C++ experience, I need help:

#include "ros/ros.h"
#include "geometry_msgs/Twist.h"
#include "turtlesim/Pose.h"

class PoseReceiver{
    turtlesim::Pose poseInfo;
    public:
        turtlesim::Pose getPose(){return poseInfo;}
        void setPose(const turtlesim::Pose pose);
        void callback(const turtlesim::Pose& msg);
};

void PoseReceiver::setPose(turtlesim::Pose pose){
    poseInfo = pose;
}

void callback(const turtlesim::Pose& msg)
{
    setPose(msg);
}

int main(int argc, char **argv){
    const double FORWARD_SPEED_MPS = 0.1;
    const double PI = 3.14159265358979323846;
    const double TURN_SPEED_RPS = PI/20;

    ros::init(argc, argv, "move_turtle");
    ros::NodeHandle node;
    PoseReceiver poseReceiver;
    geometry_msgs::Twist msg;

    ros::Publisher pub = node.advertise<geometry_msgs::Twist>("turtle1/cmd_vel",10);
    ros::Subscriber sub = node.subscribe("turtle1/pose",10,&PoseReceiver::callback, &poseReceiver);

    ROS_INFO_STREAM("Start Position: " << poseReceiver.getPose().x << ", " 
                                       << poseReceiver.getPose().y << ", Direction: " 
                                       << poseReceiver.getPose().theta);
    //==============================
    //Go straight 1m
    ros::Time start_time = ros::Time::now();
    ros::Rate rate(10);
    while(ros::ok() && ros::Time::now() - start_time < ros::Duration(10)){
        msg.linear.x = FORWARD_SPEED_MPS;
        pub.publish(msg);
        rate.sleep();
    }
    msg.linear.x = 0;
    pub.publish(msg);
    //==============================
    //Turn 45deg
    start_time = ros::Time::now();
    while(ros::ok() && ros::Time::now() - start_time < ros::Duration(5)){
        msg.angular.z = TURN_SPEED_RPS;
        pub.publish(msg);
        rate.sleep();   
    }
    msg.angular.z = 0;
    pub.publish(msg);
    //==============================
    ROS_INFO_STREAM("End Position: " << poseReceiver.getPose().x << ", " 
                                     << poseReceiver.getPose().y << ", Direction: " 
                                     << poseReceiver.getPose().theta);

}

Currently, I have this error:

/home/viki/Documents/Workspace_IntroToRobotics/src/turtle_move_package/move_turtle_node.cpp: In function ‘void callback(const Pose&)’:
/home/viki/Documents/Workspace_IntroToRobotics/src/turtle_move_package/move_turtle_node.cpp:19:13: error: ‘setPose’ was not declared in this scope
  setPose(msg);
             ^

Thank you very much.