creating object of another class when initializing an object of a class

Question

Here's what I want to achieve: I'm building a class for controlling step motors. In that class I want to have a method called "init". In that method I'd like to create an object of class Tone, which I'll need to control a motor. BUT I want to have seperate Tone class object for every object of my class that I create. How can I do it?

So, for exmaple, if I have:

myClass newmotor1;
memotor1.init();

After executing these two lines, I'd like to have my object newmotor1 (which I have, because I just created it) AND an object of class Tone, which I'll use.

Answer 1

You don't need to "create" anything. Just have an object in your class:

class Tone {
    public:
        void dosomething() {
            // Whatever is in here
        }
};

class MyMotor {
    public:
        Tone tone;
        void init() {
            // Nothing much else to do in here now.
        }
};

You then:

MyMotor newmotor1;

And you can access:

newmotor1.tone.dosomething();