Locked cancellable storage example.

anycancellable_store_locked.swift

final class SomeObservableObject: ObservableObject {
	@Published var count: Int?

	private let lock = NSRecursiveLock()
	private var cancellables = Set<AnyCancellable>()

	func fetchCount() {
		lock.sync {
			countPublisher
				.sink(receiveValue: { [weak self] in self?.count = $0 })
				.store(in: &cancellables)
		}
	}
}