Andrey Breslav
14 lines
413 B
Kotlin
14 lines
413 B
Kotlin
trait Iterator<out T> {
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fun next() : T
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val hasNext : Boolean
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fun <R> map(transform: (element: T) -> R) : Iterator<R> =
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object : Iterator<R> {
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override fun next() : R = transform(<!NO_THIS!>this@map<!>.next())
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override val hasNext : Boolean
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// There's no 'this' associated with the map() function, only this of the Iterator class
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get() = <!NO_THIS!>this@map<!>.hasNext
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}
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}
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