Tusker/Tusker/WeakArray.swift

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//
// WeakArray.swift
// Tusker
//
// Created by Shadowfacts on 3/25/20.
// Copyright © 2020 Shadowfacts. All rights reserved.
//
import Foundation
fileprivate class WeakWrapper<T: AnyObject> {
weak var value: T?
init(_ value: T?) {
self.value = value
}
}
struct WeakArray<Element: AnyObject>: Collection {
private var array: [WeakWrapper<Element>]
var startIndex: Int { array.startIndex }
var endIndex: Int { array.endIndex }
init(_ elements: [Element]) {
array = elements.map { WeakWrapper($0) }
}
init(_ elements: [Element?]) {
array = elements.map { WeakWrapper($0) }
}
subscript(_ index: Int) -> Element? {
return array[index].value
}
func index(after i: Int) -> Int {
return array.index(after: i)
}
}