Error: invalid use of member in static member function

Question

I have two classes, and this is the header of one of them:

#ifndef WRAPPER_HPP
#define WRAPPER_HPP

#include 

using namespace std;

class W         


        

Answer 1

Your class and member (screen) are not static, which means they don't actually exist. You can't access a non static member in a static function.

Try to make your data members to be static.