Bidirectional bind RxSwift, swift 3

rxbi

infix operator <~> : AssignmentPrecedence
//Bidirectional bind RxSwift, swift 3
public func <~> <E,C: ControlPropertyType>(property: C, variable: Variable<E>) -> Disposable where C.E == E? {
    
    let bindToUIDisposable = variable.asObservable()
        .bindTo(property)
    let bindToVariable = property
        .subscribe(onNext: { n in
            if let n = n{
                variable.value = n
            }
            }, onCompleted:  {
                bindToUIDisposable.dispose()
        })
    
    return Disposables.create([bindToUIDisposable, bindToVariable])
}