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.
21 lines
702 B
Kotlin
Vendored
21 lines
702 B
Kotlin
Vendored
sealed class Operation(val left: Int, val right: Int) {
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abstract fun exec(): Int
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class Plus(left: Int, right: Int): Operation(left, right) {
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override fun exec(): Int = left + right
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}
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class Minus(left: Int, right: Int): Operation(left, right) {
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override fun exec(): Int = left - right
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}
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class Times(left: Int, right: Int): Operation(left, right) {
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override fun exec(): Int = left * right
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}
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class Slash(left: Int, right: Int): Operation(left, right) {
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override fun exec(): Int = left / right
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}
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}
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fun priority(op: Operation) = when(op) {
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is Operation.Plus, is Operation.Minus -> 1
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is Operation.Times, is Operation.Slash -> 2
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}
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