Re: Chaining struct method invocations

[mzfhhhh via Digitalmars-d-learn]

On Monday, 7 September 2015 at 14:12:25 UTC, Bahman Movaqar wrote:

I need some help understand the behaviour of my code[1]. Specifically I have trouble with `add` method on line 79.

My impression is that since it returns `this`, multiple invocations can be chained like `obj.add(X).add(Y).add(Z)`. However the test on line 92 fails and if I do a `writeln`, only "p1" and "p2" records show up.

What am I missing here?  Thanks in advance.

[1] https://github.com/bahmanm/d-etudes/blob/master/source/e002/models.d

struct is a value type,you can convert to ref type by "ref":

    struct Test
    {
        int a;

        Test add1()
        {
            a++;
            return this;
        }
        ref Test add2()
        {
            a++;
            return this;
        }
    }

    Test t1;
    t1.add1.add1;
    writeln(t1.a);//1

    Test t2;
    t2.add2.add2;
    writeln(t2.a);//2