enum as Option.

enum as Option.
potatotips #52

Transcript

1. FOVN
   BT
   0QUJPO 6/21 potatotips #52 taiki komaba(@r_plus)
2. UBJLJ
   LPNBCB
   !S@QMVT
3. 0QUJPO4FU
4. CJUຖʹΦϓγϣϯΛׂ౰ͯΔ
   ΦϓγϣϯͷͨΊͷ΋ͷͬΆ͍
5. public extension DispatchQueue { public struct Attributes : OptionSet { public let rawValue: UInt64 public init(rawValue: UInt64) { self.rawValue = rawValue } public static let concurrent = Attributes(rawValue: 1<<1) @available(macOS 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *) public static let initiallyInactive = Attributes(rawValue: 1<<2) … 'PVOEBUJPOͰ΋
   Α͘࢖ΘΕ͍ͯΔ https://github.com/apple/swift/blob/master/stdlib/public/SDK/Dispatch/Queue.swift
6. struct ShippingOptions: OptionSet { let rawValue: Int static let nextDay = ShippingOptions(rawValue: 1 << 0) static let secondDay = ShippingOptions(rawValue: 1 << 1) static let priority = ShippingOptions(rawValue: 1 << 2) static let standard = ShippingOptions(rawValue: 1 << 3) } ࣮૷͢Δͱ͜͏ͳΔ
7. self.doSomething(arg, option: [.nextDay, .priority]) … func doSomething(_ arg: Any, option: ShippingOptions) { … } ࢖͏ଆ͸͜͏
8. func doSomething(_ arg: Any, option: ShippingOptions) { if option.contains(.nextDay) { … } if option.contains(. secondDay) { … } } ͰɺͲͷΦϓγϣϯ͕ࢦఆ͞Ε͔ͨͰ
   ڍಈΛม͑Δʜ
10. ͳΜ͔Φϓγϣϯ൑ఆ͍͚ͨͩ͠ʹͯ͠͸
    هड़͕໘౗͡Όͳ͍ʁ struct ShippingOptions: OptionSet { let rawValue: Int static let nextDay = ShippingOptions(rawValue: 1 << 0) static let secondDay = ShippingOptions(rawValue: 1 << 1) static let priority = ShippingOptions(rawValue: 1 << 2) static let standard = ShippingOptions(rawValue: 1 << 3) }
11. struct ShippingOptions: OptionSet { let rawValue: Int static let nextDay = ShippingOptions(rawValue: 1 << 0) static let secondDay = ShippingOptions(rawValue: 1 << 1) static let priority = ShippingOptions(rawValue: 1 << 2) static let standard = ShippingOptions(rawValue: 1 << 3) } ͳΜ͔Φϓγϣϯ൑ఆ͍͚ͨͩ͠ʹͯ͠͸
    هड़͕໘౗͡Όͳ͍ʁ ͜ͷ͋ͨΓ͕ɻ
12. FOVNͰ΍ͬͯΈΑ͏
13. 0QUJPOఆٛ
    ˠ
    γϯϓϧFOVN enum ShippingOptions { case nextDay case secondDay case priority case standard }
14. self.doSomething(arg, option: .nextDay) … func doSomething(_ arg: Any, option: ShippingOptions) { … } ࢖͏ଆ͕͜͏
15. ͜ͷ··ͩͱ
    ෳ਺Φϓγϣϯࢦఆ͕ग़དྷͳ͍ͷͰʜ
16. Մม௕Ҿ਺
    ʢ7BSJBEJD
    1BSBNFUFSTʣ
17. ͜͏ͩͬͨͷΛ self.doSomething(arg, option: .nextDay) … func doSomething(_ arg: Any, option: ShippingOptions) { … }
18. self.doSomething(arg, option: .nextDay, . priority) … Մม௕ʹ͢Δ func doSomething(_ arg: Any, option: ShippingOptions…) {…}
19. func doSomething(_ arg: Any, option: ShippingOptions…) { if option.contains(.nextDay) { … } if option.contains(. secondDay) { … } } ࣮૷ଆʹ͸"SSBZ͕དྷΔͷͰมߋͳ͠
20. ·ͱΊ
    ϝιουͷΦϓγϣϯΛ ؆୯ʹఆ͍͚ٛͨͩ͠Ͱ͋Ε͹ΞϦͳͷͰ͸
21. ͓ΘΓɻ