node_check_switch.h

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#ifndef NODE_CHECK_SWITCH_H_INCLUDED
#define NODE_CHECK_SWITCH_H_INCLUDED

//headers in ROS
#include <ros/ros.h>
#include <topic_tools/shape_shifter.h>

class node_check_switch
{
public:
    node_check_switch();
    ~node_check_switch();
private:
    ros::NodeHandle nh_;
    ros::Subscriber* sub_ptr_;
    ros::Publisher exist_pub_;
    ros::Publisher not_exist_pub_;
    std::string topic_exist_;
    std::string topic_not_exist_;
    std::string check_target_node_name_;
    void callback_(const ros::MessageEvent<topic_tools::ShapeShifter>& msg_event);
    void connection_callback_(const ros::SingleSubscriberPublisher&);
    void subscribe_();
    void unsubscribe_();
    bool target_node_exists_();
    volatile bool advertised_;
};

#endif  //NODE_CHECK_SWITCH_H_INCLUDED