Tusker/Tusker/Weak.swift

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//
// Weak.swift
// Tusker
//
// Created by Shadowfacts on 3/25/20.
// Copyright © 2020 Shadowfacts. All rights reserved.
//
import Foundation
class WeakHolder<T: AnyObject> {
weak var object: T?
init(_ object: T?) {
self.object = object
}
}
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struct WeakArray<Element: AnyObject>: MutableCollection, RangeReplaceableCollection {
private var array: [WeakHolder<Element>]
var startIndex: Int { array.startIndex }
var endIndex: Int { array.endIndex }
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init() {
array = []
}
init(_ elements: [Element]) {
array = elements.map { WeakHolder($0) }
}
init(_ elements: [Element?]) {
array = elements.map { WeakHolder($0) }
}
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subscript(position: Int) -> Element? {
get {
array[position].object
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}
set(newValue) {
array[position] = WeakHolder(newValue)
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}
}
func index(after i: Int) -> Int {
return array.index(after: i)
}
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mutating func replaceSubrange<C>(_ subrange: Range<Int>, with newElements: C) where C : Collection, Self.Element == C.Element {
array.replaceSubrange(subrange, with: newElements.map { WeakHolder($0) })
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}
}