enum as Option.

enum as Option.
potatotips #52

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1. FOVN
   BT0QUJPO
   6/21 potatotips #52
   taiki komaba(@r_plus)
   

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2. UBJLJLPNBCB
   !S@QMVT
   
   

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3. 0QUJPO4FU
   

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4. CJUຖʹΦϓγϣϯΛׂ౰ͯΔ
   ΦϓγϣϯͷͨΊͷ΋ͷͬΆ͍
   

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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
   

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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
   

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7. self.doSomething(arg, option: [.nextDay, .priority])
   …
   func doSomething(_ arg: Any, option: ShippingOptions) { … }
   ࢖͏ଆ͸͜͏
   

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8. func doSomething(_ arg: Any, option: ShippingOptions) {
   if option.contains(.nextDay) { … }
   if option.contains(. secondDay) { … }
   }
   ͰɺͲͷΦϓγϣϯ͕ࢦఆ͞Ε͔ͨͰ
   ڍಈΛม͑Δʜ
   

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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)
    }
    

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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
    

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12. FOVNͰ΍ͬͯΈΑ͏
    

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13. 0QUJPOఆٛˠγϯϓϧFOVN
    enum ShippingOptions {
    case nextDay
    case secondDay
    case priority
    case standard
    }
    

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14. self.doSomething(arg, option: .nextDay)
    …
    func doSomething(_ arg: Any, option: ShippingOptions) { … }
    ࢖͏ଆ͕͜͏
    

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15. ͜ͷ··ͩͱ
    ෳ਺Φϓγϣϯࢦఆ͕ग़དྷͳ͍ͷͰʜ
    

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16. Մม௕Ҿ਺
    ʢ7BSJBEJD1BSBNFUFSTʣ
    

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17. ͜͏ͩͬͨͷΛ
    self.doSomething(arg, option: .nextDay)
    …
    func doSomething(_ arg: Any, option: ShippingOptions) { … }
    

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18. self.doSomething(arg, option: .nextDay, . priority)
    …
    Մม௕ʹ͢Δ
    func doSomething(_ arg: Any, option: ShippingOptions…) {…}
    

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19. func doSomething(_ arg: Any, option: ShippingOptions…) {
    if option.contains(.nextDay) { … }
    if option.contains(. secondDay) { … }
    }
    ࣮૷ଆʹ͸"SSBZ͕དྷΔͷͰมߋͳ͠
    

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20. ·ͱΊ
    ϝιουͷΦϓγϣϯΛ
    ؆୯ʹఆ͍͚ٛͨͩ͠Ͱ͋Ε͹ΞϦͳͷͰ͸
    

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21. ͓ΘΓɻ
    

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