Question

Consider the class Mixer:

class Mixer{

    int numChannels;

    public: Mixer(int numChannels = 2):numChannels(numChannels){

    }

}

I have a subclass called Adder. I’d like the default of numChannels in adder to be 1. How can I achieve this?

Answer 1

Change the default value in the constructor of Adder:

class Adder: public Mixer {
  public:
    Adder(int numChannels = 1): Mixer(numChannels) {}
};