pTalanov
68 lines
1.0 KiB
Kotlin
68 lines
1.0 KiB
Kotlin
import java.util.*
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class Lifetime() {
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val attached = ArrayList< Function0<Unit> >()
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public fun attach(action : ()->Unit)
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{
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attached.add(action)
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}
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fun close()
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{
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for(x in attached) x()
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attached.clear()
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}
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}
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public class Viewable<T>()
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{
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val items = ArrayList<T>()
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fun add(item:T)
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{
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items.add(item)
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}
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fun remove(item:T)
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{
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items.remove(item)
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}
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fun view(lifetime: Lifetime, viewer: (itemLifetime:Lifetime, item:T) -> Unit)
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{
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for(item in items)
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viewer(lifetime, item)
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}
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}
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fun lifetime(body: (Lifetime)->Unit)
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{
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val l = Lifetime()
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body(l)
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l.close()
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}
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fun<T> Dump(items:ArrayList<T>)
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{
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for(item in items)
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print(item.toString() + ", ")
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println("end")
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}
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fun main(args:Array<String>)
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{
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val v = Viewable<Int>()
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val x = ArrayList<Int>()
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v.add(1)
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v.add(2)
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v.add(3)
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lifetime(
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{
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v.view(it, {(itemLifetime, item)->
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x.add(item)
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Dump(x)
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itemLifetime.attach { x.remove(item as Any); Dump(x); println("!") }
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})
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})
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} |