Hi. A question about function references. Say I have two packages, `foo` and `bar`. in `bar.Baz.kt`...

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[Jakub Gwóźdź]

Hi. A question about function references. Say I have two packages, foo and bar.

in bar.Baz.kt I have this:

package bar

fun baz(i: Int) = i + 1

and in foo.Foo.kt this:

package foo

import bar.baz

fun xd(op: (Int) -> Int) {
    println("calling $op with param 4 and getting ${op(4)}")
}

fun main() {
    xd(::baz)
}

everything works great.

now I want to get rid of import bar.baz. How do I do that? xd(::bar.baz) does not compile. What’s the syntax here?

[rkechols]

If I'm not mistaken (which is an easy thing to happen)...

It's impossible to use a function (or anything) from another package without it being imported.

If I'm incorrect, somebody please correct me, but that's my understanding.

[Joffrey]

It's actually incorrect. You can use fully qualified names for almost everything actually

[Jakub Gwóźdź]

so what would be the syntax for it, @Joffrey? without using import (and of course without switching to lambda)

[Joffrey]

Unfortunately, I said "almost everything" and I believe qualified references to top-level functions are not supported at the moment:
https://youtrack.jetbrains.com/issue/KT-52701/Support-fully-qualified-callable-reference-to-constructor-top-level-function#focus=Comments-27-6176973.0-0

[Rob Elliot]

If you're getting a conflict you can alias one of them:

import bar.baz as baz
import bar2.baz as bar2baz

fun main() {
    xd(::baz)
    xd(::bar2baz)
}

[Jakub Gwóźdź]

yes, I’m afraid imports are necessary after all, and with conflicts, also with aliases :(