Evgeniy.Zhelenskiy
38 lines
891 B
Kotlin
Vendored
38 lines
891 B
Kotlin
Vendored
// WITH_STDLIB
|
|
// WORKS_WHEN_VALUE_CLASS
|
|
// LANGUAGE: +ValueClasses
|
|
|
|
OPTIONAL_JVM_INLINE_ANNOTATION
|
|
value class Result<out T>(val value: Any?) {
|
|
val isFailure: Boolean get() = value is Failure
|
|
|
|
public companion object {
|
|
public inline fun <T> success(value: T): Result<T> =
|
|
Result(value)
|
|
|
|
public inline fun <T> failure(exception: Throwable): Result<T> =
|
|
Result(Failure(exception))
|
|
}
|
|
|
|
class Failure (
|
|
val exception: Throwable
|
|
)
|
|
}
|
|
|
|
inline fun <R> runCatching(block: () -> R): Result<R> {
|
|
return try {
|
|
Result.success(block())
|
|
} catch (e: Throwable) {
|
|
Result.failure(e)
|
|
}
|
|
}
|
|
|
|
class Box<T>(val x: T)
|
|
|
|
fun box(): String {
|
|
val r = runCatching { TODO() }
|
|
val b = Box(r)
|
|
if (r.isFailure != b.x.isFailure || !r.isFailure) return "Fail: r=${r.isFailure}; b.x=${b.x.isFailure}"
|
|
|
|
return "OK"
|
|
} |