kotlin - Why can public inline functions call private constructors -


i have private constructor class , implemented invoke on companion object kind of "generic constructor"

class test private constructor(classname: string) {     companion object {         // if remove internal fails          internal inline operator fun <reified t> invoke(): test {             return test(t::class.java.name) // why can call it? constructor private         }     } }

and can have public inline function calls generic constructor

public inline fun test() = test<any>() // why can call it, internal

shouldn't mean every invokation test() expands test(any::class.java.name) though constructor private?

so questions are:

  • why can internal inline fun call private constructor? (a public fun couldn't)
  • why can public inline fun call internal function?
  • and why can expose private constructor in public inline fun?

  • why can internal inline fun call private constructor? (a public fun couldn't)

an internal inline function can access non-public api, because can called in same module, , won't suffer binary incompatibility might introduced when api changes , calling module not re-compiled (see docs). such calls prohibited public api inline functions.

  • why can public inline fun call internal function?

it's bug. normally, public inline function cannot access non-public api. rule seems not checked invoke() operator calls. i've submitted issue: kt-20223.

  • and why can expose private constructor in public inline fun?

that's due composition of expected behavior in first point , bug in second point. ultimately, it's bug.


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