If define an instance variable which type is the defining class self

Question

What will happen if I define a class like below code with Swift, the complier doesn't give any errors:

class Test {
    var test = Test()
}

Why should Compiler give an error. This kind of declaration is not wrong. — Kudos, Aug 12 '22 at 11:28
That's perfectly legal, instances of classes can hold references to other instances of the same class. Why would there be any issues/errors? — Dávid Pásztor, Aug 12 '22 at 11:28
This is perfectly valid. Consider a linked list. The nodes in a linked list hold references to other nodes, just like your var test holds a reference to a second Test object. — Duncan C, Aug 12 '22 at 12:00
The problem is an infinite recursive call to Test() which will cause a runtime error — Joakim Danielson, Aug 12 '22 at 12:30
You should atleast mention the reason you think the compiler should give an error. — Rehan Ali Khan, Aug 17 '22 at 07:16

score 0 · Answer 1 · answered Aug 12 '22 at 12:36

0

Nothing strange happens.

It is perfectly legal for a class to hold a reference to an instance of the same class (i.e.: liked lists, trees, etc.)

answered Aug 12 '22 at 12:36

MannyCalavera27

1 Answers1