Dmitry Petrov
35 lines
883 B
Kotlin
Vendored
35 lines
883 B
Kotlin
Vendored
// WITH_RUNTIME
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import kotlin.contracts.ExperimentalContracts
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import kotlin.contracts.contract
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sealed class NetRequestStatus<out T : Any> {
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abstract val value: T?
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data class Error<out T : Any>(
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val error: Throwable,
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override val value: T? = null,
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) : NetRequestStatus<T>()
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}
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@OptIn(ExperimentalContracts::class)
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fun <T : Any> NetRequestStatus<T>.isError(): Boolean {
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contract { returns(true) implies (this@isError is NetRequestStatus.Error) }
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return (this is NetRequestStatus.Error)
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}
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fun <T : Any> successOrThrow() {
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val nextTerminal: NetRequestStatus<T> = NetRequestStatus.Error(Exception())
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if (nextTerminal.isError()) throw nextTerminal.error
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}
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fun box(): String {
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try {
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successOrThrow<String>()
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} catch (e: Exception) {
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return "OK"
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}
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return "'successOrThrow<...>()' should throw an exception"
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}
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