sealed class Result<T>
data class Error<T>(val error: Throwable) : Result<T>()
data class Value<T>(val value: T) : Result<T>()
inline fun <T> mightFail(scope: () -> T): Result<T> {
return try {
Value(scope())
} catch (ex: Throwable) {
Error(ex)
}
}
fun <T> notNull(value: T?) = mightFail {
value!!
}
fun printVal(value: Result<String>) {
when (value) {
is Error -> println("error: ${value.error}")
is Value -> println("value: ${value.value}")
}
}
fun main(args : Array<String>){
val foo = notNull("foo")
val bar = notNull(null as String?)
printVal(foo)
printVal(bar)
}
