DONT USE THIS EVER

gistfile1.txt

import UIKit
import PlaygroundSupport

var addresses = Set<String>()

class MyCell: UITableViewCell {
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        let add = "\(Unmanaged.passUnretained(self).toOpaque())"
        addresses.insert(add)
    }
}

class MyController: UITableViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.register(MyCell.self, forCellReuseIdentifier: "cell")
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 100
    }

    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 300
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as? MyCell else { fatalError() }
        return cell
    }

}

PlaygroundPage.current.liveView = MyController()
print(addresses)
print(addresses.count)
// Prints 24