Mads Ager
24 lines
368 B
Kotlin
Vendored
24 lines
368 B
Kotlin
Vendored
// !OPT_IN: kotlin.contracts.ExperimentalContracts
|
|
|
|
import kotlin.contracts.*
|
|
|
|
fun runOnce(action: () -> Unit) {
|
|
contract {
|
|
callsInPlace(action, InvocationKind.EXACTLY_ONCE)
|
|
}
|
|
action()
|
|
}
|
|
|
|
fun foo(b: Boolean): String {
|
|
val res: String
|
|
runOnce {
|
|
b
|
|
res = "OK"
|
|
}
|
|
return res
|
|
}
|
|
|
|
fun box(): String {
|
|
return foo(true)
|
|
}
|