cellForIndexPath.swift

override func viewDidLoad() {
    super.viewDidLoad()
    CollectionViewCell<FeedCellViewController, FeedViewController>.register(to: collectionView)
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let post = posts[indexPath.row]
    let cell = CollectionViewCell<FeedCellViewController, FeedViewController>.dequeue(from: collectionView, for: indexPath, parent: parent)
    cell.content?.post = post
    return cell
}