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There is a newer version: 2.1.0-Beta1

/*
 * Copyright 2010-2018 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

expect class HashMap : MutableMap {
    /**
     * Creates a new empty [HashMap].
     */
    constructor()

    /**
     * Creates a new empty [HashMap] with the specified initial capacity.
     *
     * Capacity is the maximum number of entries the map is able to store in current internal data structure.
     * When the map gets full by a certain default load factor, its capacity is expanded,
     * which usually leads to rebuild of the internal data structure.
     *
     * @param initialCapacity the initial capacity of the created map.
     *   Note that the argument is just a hint for the implementation and can be ignored.
     *
     * @throws IllegalArgumentException if [initialCapacity] is negative.
     */
    constructor(initialCapacity: Int)

    /**
     * Creates a new empty [HashMap] with the specified initial capacity and load factor.
     *
     * Capacity is the maximum number of entries the map is able to store in current internal data structure.
     * Load factor is the measure of how full the map is allowed to get in relation to
     * its capacity before the capacity is expanded, which usually leads to rebuild of the internal data structure.
     *
     * @param initialCapacity the initial capacity of the created map.
     *   Note that the argument is just a hint for the implementation and can be ignored.
     * @param loadFactor the load factor of the created map.
     *   Note that the argument is just a hint for the implementation and can be ignored.
     *
     * @throws IllegalArgumentException if [initialCapacity] is negative or [loadFactor] is non-positive.
     */
    constructor(initialCapacity: Int, loadFactor: Float)

    /**
     * Creates a new [HashMap] filled with the contents of the specified [original] map.
     */
    constructor(original: Map)

    // From Map

    override val size: Int
    override fun isEmpty(): Boolean
    override fun containsKey(key: K): Boolean
    override fun containsValue(value: @UnsafeVariance V): Boolean
    override operator fun get(key: K): V?

    // From MutableMap

    override fun put(key: K, value: V): V?
    override fun remove(key: K): V?
    override fun putAll(from: Map)
    override fun clear()
    override val keys: MutableSet
    override val values: MutableCollection
    override val entries: MutableSet>
}