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Information about the changes made to an object which is passed to `Object’s notification blocks.

A RealmCollectionChange value encapsulates information about changes to collections that are reported by Realm notifications.

The change information is available in two formats: a simple array of row indices in the collection for each type of change, and an array of index paths in a requested section suitable for passing directly to UITableView’s batch update methods.

The arrays of indices in the .Update case follow UITableView’s batching conventions, and can be passed as-is to a table view’s batch update functions after being converted to index paths. For example, for a simple one-section table view, you can do the following:

self.notificationToken = results.addNotificationBlock { changes in
    switch changes {
    case .initial:
        // Results are now populated and can be accessed without blocking the UI
        self.tableView.reloadData()
        break
    case .update(_, let deletions, let insertions, let modifications):
        // Query results have changed, so apply them to the TableView
        self.tableView.beginUpdates()
        self.tableView.insertRowsAtIndexPaths(insertions.map { NSIndexPath(forRow: $0, inSection: 0) },
           withRowAnimation: .Automatic)
        self.tableView.deleteRowsAtIndexPaths(deletions.map { NSIndexPath(forRow: $0, inSection: 0) },
           withRowAnimation: .Automatic)
        self.tableView.reloadRowsAtIndexPaths(modifications.map { NSIndexPath(forRow: $0, inSection: 0) },
           withRowAnimation: .Automatic)
        self.tableView.endUpdates()
        break
    case .error(let err):
        // An error occurred while opening the Realm file on the background worker thread
        fatalError("\(err)")
        break
    }
}