C++在派生类中将默认参数更改为构造函数

Question

考虑 Mixer 类:

class Mixer{

    int numChannels;

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

    }

}

我有一个名为 Adder 的子类。我希望 adder 中的 numChannels 默认值为 1。我该如何实现？

Answer 1

像这样:

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