Feed and Folder protocols with a couple of concrete implementations in the spirit of http://inessential.com/2015/07/19/secret_projects_diary_2_swift_2_0_prot

RSSKit.swift

func ==<T:Feed>(lhs: T, rhs: T) -> Bool {
    return lhs.link == rhs.link
}

protocol Feed : Equatable {
    var link : String {get}
}

protocol Folder {
    typealias FeedType: Feed
    var feeds: [FeedType] {get}
    func addFeeds(feedsToAdd: [FeedType])
}





class LocalFeed : Feed {
    var link = "asdf"
}

class LocalFolder : Folder {
    typealias FeedType = LocalFeed
    var feeds: [FeedType] = []
    func addFeeds(feedsToAdd: [FeedType]) {
        for feed in feedsToAdd {
            self.feeds.insert(feed, atIndex:0)
        }
    }
}




class FeedBinFeed : Feed {
    var link = "aoeu"
}

class FeedBinFolder : Folder {
    typealias FeedType = FeedBinFeed
    var feeds: [FeedType] = []
    func addFeeds(feedsToAdd: [FeedType]) {
        for feed in feedsToAdd {
            self.feeds.insert(feed, atIndex:0)
        }
    }
}