I mean, I understand why this interaction works th...

# announcements

[Hullaballoonatic]

I mean, I understand why this interaction works this way, but it still makes me sad ☹️
https://pl.kotl.in/_g7Nag0rP
in my particular use case, it'd be nice if the Bar1 was also added to foos, but I imagine in other cases, that would be horrendous

[Hullaballoonatic]

i updated the message

[Hullaballoonatic]

oh, because foos hasn't been instantiated yet?

[streetsofboston]

foos is not null. You can have forward declarations. Circular declarations may have some weird behavior, though.

[Hullaballoonatic]

hmm, that's actually really interesting

[Hullaballoonatic]

learning experience!

[streetsofboston]

If the ‘dependency’ tree is a-cyclical, Kotlin can figure out when to instantiate what vals/vars

[streetsofboston]

abstract class Base(val base: Base?, val id: Int) {
    init {
        println("Initing $base with id $id")
    }
}

object A: Base(B, 1)
object B: Base(A, 2)

fun main() {
    println("{$A.base} and ${B.base}")
}

Cyclical ; not sure if behavior is defined or undefined, but I guess you shouldn’t count on it 🙂

[Hullaballoonatic]

ah, good to know

[louis993546]

all you need to do is to use Bar1
https://pl.kotl.in/z0dp394Jk

[streetsofboston]

But to your point, initialization is somewhat lazy:
try

abstract class Base(val base: Base?, val id: Int) {
    init {
        println("Initing $base with id $id")
    }
}

object A: Base(B, 1)
object B: Base(A, 2)

fun main() {
    println("Main")
    println("{$A.base} and ${B.base}")
}

You’ll see that Main is printed before the Initing .. ones

Main
Initing null with id 2
Initing cycle.B@2c7b84de with id 1
{[e-mail]} and null

[Hullaballoonatic]

@Ruckus I think because when you call println(A.b) it instantiates A, which then calls B to set A.b, so now B is being instantiated, which then calls A to set B.a, which is already instantiated

[streetsofboston]

More evidence object initialization is a bit lazy.

[Hullaballoonatic]

@louis993546 I guess this is a case for ping!
fun Any.ping() = this