The Kotlin documentation says that if all of the p...

# announcements

[ageery]

The Kotlin documentation says that if all of the primary constructor parameters for a class have default values, on the JVM, Kotlin will create an additional parameterless constructor. So I was surprised that this doesn't work:

class BadTest(val name: String? = null)
val badTestCreator: () -> BadTest = ::BadTest

But that this does work:

class GoodTest(val name: String? = null) {
    constructor(): this(name = null)
}
val goodTestCreator: () -> GoodTest = ::GoodTest

Shouldn't there be a no-arg constructor for BadTest that would satisfy the () -> BadTest type?

[Zach Klippenstein (he/him) [MOD]]

I think it generates one in the bytecode, but the type of the constructor "function" still includes all the parameters, which is why you can't pass a reference to it as a nullary function.