Initialization of reference member of base class in derived class?

Projects Programming
5

arduarn:

class utilities {

public:
utilities() {}
 //lots of Members
 void sth() { }
};

class animation {
public:
 animation(utilities &u) : utils(u) {}
 virtual void render() = 0; //abstract class
 //other members
protected:
 utilities &utils;
};

class randomAnimation : public animation {
public:
 randomAnimation(/int wait, RGB24B color,/ utilities &u) : animation(u) {}

virtual void render() {
   utils.sth();
 }
};

I do not completly understand what this code would do:

If I would create a instance of randomAnimation would I have to do this:

randomAnimation ani(myInstanceofutilities)

?

I would test if it works but the code is for a 777 or 121212 RGB LEDCube and I am in holiday right now and do not have a cube with me.