//
// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
//

import Foundation

class Observable<T> {

    typealias Observer = (T) -> ()
    private var observer: Observer?
    
    var value: T {
        didSet {
            observer?(value)
        }
    }
    
    init(_ v: T) {
        value = v
    }

    func add(_ observer: Observer?) {
        self.observer = observer
    }

    func addAndNotify(_ observer: Observer?) {
        self.observer = observer
        observer?(value)
    }

    func notify() {
        observer?(value)
    }
}