gistfile1.cpp

// denne klasse skal vise progress..
class monitor {
   void progress(int) = 0;
};

// 

class libasciify {
    public:
        libasciify(std::string, monitor);
        std::string getAscii();

    protected:
        void updateProgress(int, int, int, int);
        std::vector<std::string> grayscale_chars;
        std::vector<int> grayscale_bounds;
        std::string ascii_str;
        int current_progress; // percentage
};

i getAscii() kalder du saa monitor->guimonitor(current_progress); 

/// i gui

class guimonitor : monitor { 
   void progress(int current_progress) {
      // Qmagic der opdaterer progress baren,
   }
}


et sted i din gui har du noget i stil med

libasciify asciifier(text, new guimonitor());

asciifier.getAscii();