godrm

import Foundation

class LineFactory {
    static var lineCount : Int = 0
    static func makeLine() -> Line {
        return Line()
    }
    
    class func randomLine() -> Line {
        let line = Line()

godrm

struct Memory {
    static func dump<T>(variable: inout T) {
        withUnsafePointer(to: &variable) { print($0) }
    }
    
    static func dump(with: UnsafeRawPointer) {
        let address = Int(bitPattern: with)
        print(String(format:"%p", address))
    }
    

godrm

typedef void (^AVAssetImageGeneratorCompletionHandler)(CMTime, CGImageRef _Nullable, CMTime, AVAssetImageGeneratorResult, NSError * _Nullable);

// ...

- (void)generateCGImagesAsynchronouslyForTimes:(NSArray<NSValue *> *)requestedTimes 
                             completionHandler:(AVAssetImageGeneratorCompletionHandler)handler;

godrm

var racyGlobal: [String] = []

@MyGlobalActor
var safeGlobal: [String] = []

class PlainOldClass {
  var unprotectedState: String = []
}

actor class RacyActor {

godrm

actor class MyActor {
  let immutable: String = "42"
  var mutableArray: [String] = []

  func synchronousFunction() {
    mutableArray += ["syncFunction called"]
  }
}

extension MyActor {

godrm

func makeDinner() async throws -> Meal {
  async let veggies = try chopVegetables()
  async let meat = marinateMeat()
  async let oven = try preheatOven(temperature: 350)

  let dish = Dish(ingredients: await [veggies, meat])
  return await try oven.cook(dish, duration: .hours(3))
}

godrm

@UIActor
class PlayerRefreshController {
  var players: [String] = []
  var gameSession: GameSession
    
  func refreshPlayers() async {  ...  }
}

godrm

actor class PlayerRefreshController {
  var players: [String] = []
  var gameSession: GameSession

  func refreshPlayers() async { ... }
}

godrm

class PlayerRefreshController {
    var players: [String] = []
    var gameSession: GameSession
    var refreshQueue = DispatchQueue(label: "PlayerRefresh")

    internal func refreshPlayers(completion: (() -> Void)? = nil) {
        refreshQueue.async {
            self.gameSession.allPlayers { players in
                self.players = players.map(\.nickname)
                completion?()

godrm

import Cocoa

var str = "Hello, playground"
let ptr = UnsafeRawPointer(str)

let origin = CGPoint(x: 0, y: 0)
var other = origin
other.x += 10
var another = origin
another.y += 5