Mikhail Glukhikh
f6872dfbea
When on sealed can use is (both for derived classes and objects) or just comparison (only for derived objects). A pack of tests provided.
14 lines
368 B
Kotlin
Vendored
14 lines
368 B
Kotlin
Vendored
sealed class Tree {
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object Empty: Tree()
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class Leaf(val x: Int): Tree()
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class Node(val left: Tree, val right: Tree): Tree()
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fun max(): Int {
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when(this) {
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is Empty -> return -1
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is Leaf -> return <!DEBUG_INFO_SMARTCAST!>this<!>.x
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is Node -> return <!DEBUG_INFO_SMARTCAST!>this<!>.left.max()
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}
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}
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}
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