Mikhael Bogdanov
28 lines
509 B
Kotlin
28 lines
509 B
Kotlin
|
|
trait MyIterator<T> {
|
|
fun hasNext() : Boolean
|
|
fun next() : T
|
|
}
|
|
|
|
fun <T : Any> T?.iterator() = object : MyIterator<T> {
|
|
var hasNext = this@iterator != null
|
|
private set
|
|
override fun hasNext() = hasNext
|
|
|
|
override fun next() : T {
|
|
if (hasNext) {
|
|
hasNext = false
|
|
return this@iterator!!
|
|
}
|
|
throw java.util.NoSuchElementException()
|
|
}
|
|
}
|
|
|
|
fun box() : String {
|
|
var k = 0
|
|
for (i in 1) {
|
|
k++
|
|
}
|
|
return if(k == 1) "OK" else "fail"
|
|
}
|