protected AbstractMutableSet()
Provides a skeletal implementation of the MutableSet interface.
E - the type of elements contained in the set. The set is invariant on its element type.
© 2010–2018 JetBrains s.r.o.
Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-abstract-mutable-set/-init-.html