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Kotlin Standard Library for JVM
/*
* 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
import java.util.AbstractSet
/**
* Provides a skeletal implementation of the [MutableSet] interface.
*
* @param E the type of elements contained in the set. The set is invariant in its element type.
*/
@SinceKotlin("1.1")
public actual abstract class AbstractMutableSet protected actual constructor() : MutableSet, AbstractSet() {
/**
* Adds the specified element to the set.
*
* This method is redeclared as abstract, because it's not implemented in the base class,
* so it must be always overridden in the concrete mutable collection implementation.
*
* @return `true` if the element has been added, `false` if the element is already contained in the set.
*/
actual abstract override fun add(element: E): Boolean
}