Mikhail Glukhikh
32 lines
973 B
Kotlin
Vendored
32 lines
973 B
Kotlin
Vendored
// !OPT_IN: kotlin.contracts.ExperimentalContracts
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// ISSUE: KT-43260
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import kotlin.contracts.ExperimentalContracts
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import kotlin.contracts.contract
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sealed class Either<L : Any, R : Any> {
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data class Left<L : Any, R : Any>(val leftValue: L) : Either<L, R>()
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data class Right<L : Any, R : Any>(val rightValue: R) : Either<L, R>()
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}
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inline fun <reified L : Any, reified R : Any> Either<L, R>.isLeft(): Boolean {
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contract {
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returns(true) implies (this@isLeft is Either.Left<L, R>)
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}
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return this is Either.Left<L, R>
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}
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inline fun <reified L : Any, reified R : Any> Either<L, R>.isRight(): Boolean {
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contract {
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returns(true) implies (this@isRight is Either.Right<L, R>)
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}
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return this is Either.Right<L, R>
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}
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fun test() {
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val result: Either<Exception, Unit> = Either.Left(RuntimeException("simulating missing code"))
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if (result.isLeft()) {
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val cause = <!DEBUG_INFO_SMARTCAST!>result<!>.leftValue.cause
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}
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}
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