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| // git clone git@github.com:7045bccac80f267a66a93e23626cd427.git yinyang | |
| // cd yinyang | |
| // kotlinc yinyang.kt -include-runtime -d yinyang.jar && java -jar yinyang.jar; rm yinyang.jar | |
| // Copied from https://github.com/arrow-kt/arrow/blob/0.10.1/modules/core/arrow-core-data/src/main/kotlin/arrow/typeclasses/ContinuationUtils.kt | |
| import kotlin.coroutines.Continuation | |
| import kotlin.coroutines.resume | |
| import kotlin.coroutines.intrinsics.suspendCoroutineUninterceptedOrReturn | |
| private val coroutineImplClass by lazy { Class.forName("kotlin.coroutines.jvm.internal.BaseContinuationImpl") } | |
| private val completionField by lazy { coroutineImplClass.getDeclaredField("completion").apply { isAccessible = true } } | |
| private var <T> Continuation<T>.completion: Continuation<*>? | |
| get() = completionField.get(this) as Continuation<*> | |
| set(value) = completionField.set(this@completion, value) | |
| var <T> Continuation<T>.stateStack: List<Map<String, *>> | |
| get() { | |
| if (!coroutineImplClass.isInstance(this)) return emptyList() | |
| val resultForThis = (this.javaClass.declaredFields) | |
| .associate { it.isAccessible = true; it.name to it.get(this@stateStack) } | |
| .let(::listOf) | |
| val resultForCompletion = completion?.stateStack | |
| return resultForCompletion?.let { resultForThis + it } ?: resultForThis | |
| } | |
| set(value) { | |
| if (!coroutineImplClass.isInstance(this)) return | |
| val mapForThis = value.first() | |
| (this.javaClass.declaredFields).forEach { | |
| if (it.name in mapForThis) { | |
| it.isAccessible = true | |
| val fieldValue = mapForThis[it.name] | |
| it.set(this@stateStack, fieldValue) | |
| } | |
| } | |
| completion?.stateStack = value.subList(1, value.size) | |
| } | |
| // https://medium.com/@georgeleung_7777/the-yin-yang-puzzle-in-kotlin-bb1d5449d6f0 | |
| data class Cont( | |
| val cont: Continuation<Cont>, | |
| val stateStack: List<Map<String, *>> | |
| ) : (Cont) -> Unit { | |
| override fun invoke(p1: Cont) { | |
| cont.stateStack = stateStack | |
| cont.resume(p1) | |
| } | |
| } | |
| suspend fun captureCont(): Cont = suspendCoroutineUninterceptedOrReturn { c -> | |
| Cont(c, stateStack = c.stateStack) | |
| } | |
| suspend fun main() { | |
| val yin = captureCont() | |
| println("@") | |
| val yang = captureCont() | |
| print("*") | |
| yin(yang) | |
| } |
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kotlinc-jvm 1.8.10