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/*
* Copyright 2016-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
@file:Suppress("UNCHECKED_CAST")
package kotlinx.coroutines.internal
import kotlinx.coroutines.assert
import kotlin.jvm.*
/*
* Inline class that represents a mutable list, but does not allocate an underlying storage
* for zero and one elements.
* Cannot be parametrized with `List<*>`.
*/
@JvmInline
internal value class InlineList<E>(private val holder: Any? = null) {
operator fun plus(element: E): InlineList<E> {
assert { element !is List<*> } // Lists are prohibited
return when (holder) {
null -> InlineList(element)
is ArrayList<*> -> {
(holder as ArrayList<E>).add(element)
InlineList(holder)
}
else -> {
val list = ArrayList<E>(4)
list.add(holder as E)
list.add(element)
InlineList(list)
}
}
}
inline fun forEachReversed(action: (E) -> Unit) {
when (holder) {
null -> return
!is ArrayList<*> -> action(holder as E)
else -> {
val list = holder as ArrayList<E>
for (i in (list.size - 1) downTo 0) {
action(list[i])
}
}
}
}
}
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