Alex Tkachman
31 lines
889 B
Kotlin
31 lines
889 B
Kotlin
package std.concurrent
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import java.util.concurrent.Executor
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import jet.Iterator
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class FunctionalQueue<T> (
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val input: FunctionalList<T> = FunctionalList.emptyList<T>(),
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val output: FunctionalList<T> = FunctionalList.emptyList<T>()) {
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val size : Int
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get() = input.size + output.size
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val empty : Boolean
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get() = size == 0
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fun add(element: T) = FunctionalQueue<T>(input add element, output)
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fun addFirst(element: T) = FunctionalQueue<T>(input, output add element)
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fun removeFirst() : #(T,FunctionalQueue<T>) =
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if(output.empty) {
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if(input.empty)
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throw java.util.NoSuchElementException()
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else
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FunctionalQueue<T>(FunctionalList.emptyList<T>(), input.reversed()).removeFirst()
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}
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else {
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#(output.head, FunctionalQueue<T>(input, output.tail))
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}
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}
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