AnyRemoteContent.swift

final class AnyRemoteContent<Value> : RemoteContent {

    init<R: RemoteContent>(_ remoteContent: R) where R.ObjectWillChangePublisher == ObjectWillChangePublisher,
                                                     R.Value == Value {

        objectWillChangeClosure = {
            remoteContent.objectWillChange
        }

        loadingStateClosure = {
            remoteContent.loadingState
        }

        loadClosure = {
            remoteContent.load()
        }

        cancelClosure = {
            remoteContent.cancel()
        }
    }

    private let objectWillChangeClosure: () -> ObjectWillChangePublisher

    var objectWillChange: ObservableObjectPublisher {
        objectWillChangeClosure()
    }

    private let loadingStateClosure: () -> RemoteContentLoadingState<Value>

    var loadingState: RemoteContentLoadingState<Value> {
        loadingStateClosure()
    }

    private let loadClosure: () -> Void

    func load() {
        loadClosure()
    }

    private let cancelClosure: () -> Void

    func cancel() {
        cancelClosure()
    }
}