CancelBag

Adapted from https://gist.github.com/filimo/6f826b352f75cd1640e4e705340c0301

Instead of using a Set, use a CancelBag instead (kind of like the DisposeBag in RxSwift).

No need to use references when storing cancellables and you can also collect multiple cancellable instances without calling .store(in:).

Collecting

Before:

let subscriptions = Set<AnyCancellable>()

optionalPublisher?
    .sink { value in
        print("received value: \(value)")
    }
    .store(in: &subscriptions)
publisher
    .assign(to: \.someVar, on: self)
    .store(in: &subscriptions)
subject
    .subscribe(publisher2)
    .store(in: &subscriptions)

Now:

let cancelBag = CancelBag()

optionalPublisher?
    .sink { value in
        print("received value: \(value)")
    }
    .store(in: cancelBag)
publisher
    .assign(to: \.someVar, on: self)
    .store(in: cancelBag)
subject
    .subscribe(publisher2)
    .store(in: cancelBag)

Or even better:

let cancelBag = CancelBag()

cancelBag.collect {
    optionalPublisher?
    .sink { value in
        print("received value: \(value)")
    }
    publisher
        .assign(to: \.someVar, on: self)
    subject
        .subscribe(publisher2)
}

Canceling

It's as simple as:

cancelBag.cancel()