Constructor with "this" in C++? [duplicate]

Question

In Java, we can write as following:

public class Demo{
    private int val;
    public Demo(int val){this.val = val;}
    public Demo(){this(0);}
}

However, it does not work in C++:

class Demo{
    private:
       int _val;
    public:
       Demo(int val):_val(val){}
       Demo(){this(0);}
}

How to revise this code?

Answer 1

With C++11, you could use delegate constructor:

Demo():Demo(0){ }