How to pass functions to function in Kotlin

Question

I want to pass one or more function(s) to a function but as long as it is a function literal or a package function it's working but when I change it to a function of a specific class (member function) I have the following problems

suppose I have these two functions

fun foo() { //doSomething }
fun bar(function: () -> Unit) { 
    //anotherThing! 
    function()
}

when I call

bar(foo())

or

bar(::foo)

I've encountered a type mismatch (Required: ()->Unit , Found: Unit)

Note: I don't want to solve it like this

bar( { foo() } )

or

bar {
foo()
}

This feature is not implemented yet, see stackoverflow.com/questions/28022388/… — aga
– aga, Commented Nov 23, 2015 at 15:50
It works for me -- try.kotlinlang.org/#/UserProjects/f9jhaiqob1emh7ho02m7embdsd/… — bashor
– bashor, Commented Nov 23, 2015 at 15:55
yes it's a member function (I know which it's working for package functions) — Siavash
– Siavash, Commented Nov 23, 2015 at 16:00

mfulton26 · Accepted Answer · 2020-01-29 14:41:48Z

1

In Kotlin 1.1 and later you can use bound callable references. e.g. bar(::foo).

In the second 1.0 Beta Candidate and other prior versions you could not pass around member functions. This issue was tracked as KT-6947.

edited Jan 29, 2020 at 14:41

answered Dec 4, 2015 at 16:02

mfulton26

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Comments

Dzmitry Misiuk · Accepted Answer · 2015-11-23 22:27:57Z

0

I have just checked your example. It's works for me. Kotlin version 1.0.0-beta-2423

answered Nov 23, 2015 at 22:27

Dzmitry Misiuk

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1 Comment

Siavash Over a year ago

I forgot to say which the function that I want to pass can be a member function otherwise you're right

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