Igor Yakovlev
17 lines
627 B
Kotlin
17 lines
627 B
Kotlin
/*
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* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package kotlin.sequences
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internal actual class ConstrainedOnceSequence<T> actual constructor(sequence: Sequence<T>) : Sequence<T> {
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private var sequenceRef: Sequence<T>? = sequence
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actual override fun iterator(): Iterator<T> {
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val sequence = sequenceRef ?: throw IllegalStateException("This sequence can be consumed only once.")
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sequenceRef = null
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return sequence.iterator()
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}
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}
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