enum as Option. - Speaker Deck

enum as Option.

by r-plus

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

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UBJLJLPNBCB !S@QMVT

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CJUຖʹΦϓγϣϯΛׂ౰ͯΔ ΦϓγϣϯͷͨΊͷ΋ͷͬΆ͍

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

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

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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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FOVNͰ΍ͬͯΈΑ͏

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

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

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͜ͷ··ͩͱ ෳ਺Φϓγϣϯࢦఆ͕ग़དྷͳ͍ͷͰʜ

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Մม௕Ҿ਺ ʢ7BSJBEJD1BSBNFUFSTʣ

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

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

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