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Kotlin Standard Library

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/*
 * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package kotlin.collections

/**
 * Provides a skeletal implementation of the [MutableCollection] interface.
 *
 * @param E the type of elements contained in the collection. The collection is invariant in its element type.
 */
@SinceKotlin("1.3")
public expect abstract class AbstractMutableCollection : MutableCollection {
    protected constructor()

    abstract override val size: Int
    abstract override fun iterator(): MutableIterator
    abstract override fun add(element: E): Boolean

    override fun isEmpty(): Boolean
    override fun contains(element: @UnsafeVariance E): Boolean
    override fun containsAll(elements: Collection<@UnsafeVariance E>): Boolean


    override fun addAll(elements: Collection): Boolean
    override fun remove(element: E): Boolean
    override fun removeAll(elements: Collection): Boolean
    override fun retainAll(elements: Collection): Boolean
    override fun clear(): Unit
}