[Swift] Dynamic class for binding

Dynamic.swift

//
//  Dynamic.swift
//
//  Created by 홍경표 on 2021/05/23.
//

import Foundation

final class Dynamic<T> {
    
    typealias Listener = (T) -> Void
    var listener: Listener?
    var value: T {
        didSet {
            listener?(value)
        }
    }
    
    init(_ v: T) {
        value = v
    }
    
    func bind(_ listener: Listener?) {
        self.listener = listener
    }
    
    func bindAndFire(_ listener: Listener?) {
        self.listener = listener
        listener?(value)
    }
    
}