svtk
42 lines
1.1 KiB
Plaintext
42 lines
1.1 KiB
Plaintext
package a
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import java.*
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import java.util.*
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/////////////////////////////////////////////////////////////////////////
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fun done<O>(result : O) : Iteratee<Any?, O> = StrangeIterateeImpl<Any?, O>(result)
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abstract class Iteratee<in I, out O> {
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abstract fun process(item : I) : Iteratee<I, O>
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abstract val isDone : Boolean
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abstract val result : O
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abstract fun done() : O
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}
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class StrangeIterateeImpl<in I, out O>(val obj: O) : Iteratee<I, O>() {
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override fun process(item: I): Iteratee<I, O> = StrangeIterateeImpl<I, O>(obj)
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override val isDone = true
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override val result = obj
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override fun done() = obj
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}
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abstract class Sum() : Iteratee<Int, Int>() {
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override fun process(item : Int) : Iteratee<Int, Int> {
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return a.done<Int>(item);
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}
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abstract override val isDone : Boolean
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abstract override val result : Int
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abstract override fun done() : Int
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}
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abstract class Collection<E> : Iterable<E> {
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fun iterate<O>(var iteratee : Iteratee<E, O>) : O {
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for (x in this) {
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val it = iteratee.process(x)
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if (it.isDone) return it.result
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iteratee = it
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}
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return iteratee.done()
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}
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} |