datasource.swift

struct TableViewSection<T, Cell: UITableViewCell> {
    var cellIdentifier: String = ""
    var items: [T] = []
    var configureCell: (cell: Cell, item: T, indexPath: NSIndexPath) -> Void
}

class TableViewDataSource: NSObject, UITableViewDataSource {
    var sections: [TableViewSection<?, ?>] = [] // I want arbitrary T/Cell types here, what do?
    
    // ...
}