Compatible Layer: Commonly used Disposable Types in RxSwift 2.x

Disposables.swift

public class AnonymousDisposable: Cancelable {

    public func dispose() {
        self.disposableImpl.dispose()
    }

    public var isDisposed: Bool { return self.disposableImpl.isDisposed }

    private var disposableImpl: Cancelable

    public init(_ closure: @escaping () -> ()) {
        self.disposableImpl = Disposables.create {
            closure()
        }
    }
}

public class NopDisposable: Disposable {

    public func dispose() {
        // do nothing
    }

    /// Singleton
    public static let instance: Disposable = Disposables.create()
}