1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import MacroExamplesInterface
// MARK: - Dictionary Storage
// Move the storage from each of the stored properties into a dictionary
// called `_storage`, turning the stored properties into computed properties.
@DictionaryStorage
struct Point {
var x: Int = 1
var y: Int = 2
}
func runDictionaryStorageMacroPlayground() {
var point = Point()
print("Point storage begins as an empty dictionary: \(point)")
print("Default value for point.x: \(point.x)")
point.y = 17
print("Point storage contains only the value we set: \(point)")
}
// MARK: - Observable
struct Treat {}
@Observable
final class Dog {
var name: String?
var treat: Treat?
var isHappy: Bool = true
init() {}
func bark() {
print("bork bork")
}
}
func runObservableMacroPlayground() {
let dog = Dog()
print(dog.name ?? "")
dog.name = "George"
dog.treat = Treat()
print(dog.name ?? "")
dog.bark()
}
// MARK: - Option Set
@MyOptionSet<UInt8>
struct ShippingOptions {
private enum Options: Int {
case nextDay
case secondDay
case priority
case standard
}
static let express: ShippingOptions = [.nextDay, .secondDay]
static let all: ShippingOptions = [.express, .priority, .standard]
}
|
