I know this question had been asked many times but I’m still stuck. I thought I got what this error was about what obviously I don’t.
So, the error I am getting is
a nonstatic member reference must be relative to a specific object
My code is:
class theTranslator {
public:
ros::NodeHandle nh;
ros::Publisher pub = nh.advertise<sensor_msgs::Image>("camera/depth/image_raw", 100);
static void getMessage(const sensor_msgs::Image::ConstPtr& recMmsg) {
ROS_INFO( "I heard message" );
pub.publish(recMmsg); //*** ERROR IS HERE ***
}
};
since pub is part of the same class as getMessage(), shouldn’t it work? How can I make a static member function use a variable member of the same class?
P.S. this is done in ROS (Robotics Operating System) but I believe this is a C++ mistake (not related to ROS).
1
In C++ you can not access a non static class member from a static method. Make it a normal method and try like below:-
void getMessage(const sensor_msgs::Image::ConstPtr& recMmsg){
ROS_INFO( "I heard message" );
pub.publish(recMmsg); //*** ERROR IS HERE ***
}
Else declare pub as static member
static ros::Publisher pub;
Also refer to the below answer
C++ static member functions and variables
1
You need to make getMessage non-static or you need to make pub static.
Probably what you really need to do is rethink your design. Why are you trying to make getMessage static? As a very general rule of thumb static is a mistake, especially for a newbie.
3