When building the code below, two compiler errors appear in AppDelegate.swift:
Value of type 'Slice<MyCollection<MySubCollection>>' has no member 'url'
No exact matches in call to instance method 'remove'
When moving the first 2 classes in ViewController.swift to AppDelegate.swift, the issues go away. Is this expected, or a bug?
// AppDelegate.swift
//
import Cocoa
@main
class AppDelegate: NSObject, NSApplicationDelegate {
func applicationDidFinishLaunching(_ aNotification: Notification) {
var collection: MyCollection<MySubCollection>!
let a = collection.first!.url!
var subCollection: MySubCollection!
collection.remove(subCollection)
}
}
//
// ViewController.swift
//
import Cocoa
class MyCollection<Element>: MyCollectionProtocol {
var elements = [Element]()
}
class MySubCollection: MyCollectionProtocol {
var elements = [String]()
var url: URL?
}
protocol MyCollectionProtocol: AnyObject, Collection where Index == Int {
associatedtype Element
var elements: [Element] { get set }
}
extension MyCollectionProtocol {
var startIndex: Index {
return elements.startIndex
}
var endIndex: Index {
return elements.endIndex
}
subscript(position: Index) -> Element {
return elements[position]
}
func index(after i: Index) -> Index {
return elements.index(after: i)
}
}
extension MyCollectionProtocol where Element == String {
func remove(_ element: Element) {
}
}
extension MyCollectionProtocol where Element: MyCollectionProtocol {
func remove(_ element: Element) {
}
}
