Igor Yakovlev
48 lines
1.0 KiB
Kotlin
Vendored
48 lines
1.0 KiB
Kotlin
Vendored
// WITH_STDLIB
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// WORKS_WHEN_VALUE_CLASS
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// LANGUAGE: +ValueClasses
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OPTIONAL_JVM_INLINE_ANNOTATION
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value class Result<out T>(val value: Any?) {
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fun exceptionOrNull(): Throwable? =
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when (value) {
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is Failure -> value.exception
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else -> null
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}
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public companion object {
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public inline fun <T> success(value: T): Result<T> =
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Result(value)
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public inline fun <T> failure(exception: Throwable): Result<T> =
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Result(Failure(exception))
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}
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class Failure(
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val exception: Throwable
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)
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}
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inline fun <T, R> T.runCatching(block: T.() -> R): Result<R> {
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return try {
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Result.success(block())
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} catch (e: Throwable) {
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Result.failure(e)
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}
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}
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inline fun <R, T : R> Result<T>.getOrElse(onFailure: (exception: Throwable) -> R): R {
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return when (val exception = exceptionOrNull()) {
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null -> value as T
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else -> onFailure(exception)
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}
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}
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class A {
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fun f() = runCatching { "OK" }.getOrElse { throw it }
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}
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fun box(): String = A().f()
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