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r-plus
June 21, 2018
Technology
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enum as Option.
enum as Option.
potatotips #52
r-plus
June 21, 2018
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Transcript
FOVN BT0QUJPO 6/21 potatotips #52 taiki komaba(@r_plus)
UBJLJLPNBCB !S@QMVT
0QUJPO4FU
CJUຖʹΦϓγϣϯΛׂͯΔ ΦϓγϣϯͷͨΊͷͷͬΆ͍
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 Α͘ΘΕ͍ͯΔ https://github.com/apple/swift/blob/master/stdlib/public/SDK/Dispatch/Queue.swift
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
self.doSomething(arg, option: [.nextDay, .priority]) … func doSomething(_ arg: Any, option:
ShippingOptions) { … } ͏ଆ͜͏
func doSomething(_ arg: Any, option: ShippingOptions) { if option.contains(.nextDay) {
… } if option.contains(. secondDay) { … } } ͰɺͲͷΦϓγϣϯ͕ࢦఆ͞Ε͔ͨͰ ڍಈΛม͑Δʜ
None
ͳΜ͔Φϓγϣϯఆ͍͚ͨͩ͠ʹͯ͠ هड़͕໘͡Όͳ͍ʁ 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) }
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) } ͳΜ͔Φϓγϣϯఆ͍͚ͨͩ͠ʹͯ͠ هड़͕໘͡Όͳ͍ʁ ͜ͷ͋ͨΓ͕ɻ
FOVNͰͬͯΈΑ͏
0QUJPOఆٛˠγϯϓϧFOVN enum ShippingOptions { case nextDay case secondDay case priority
case standard }
self.doSomething(arg, option: .nextDay) … func doSomething(_ arg: Any, option: ShippingOptions)
{ … } ͏ଆ͕͜͏
͜ͷ··ͩͱ ෳΦϓγϣϯࢦఆ͕ग़དྷͳ͍ͷͰʜ
ՄมҾ ʢ7BSJBEJD1BSBNFUFSTʣ
͜͏ͩͬͨͷΛ self.doSomething(arg, option: .nextDay) … func doSomething(_ arg: Any, option:
ShippingOptions) { … }
self.doSomething(arg, option: .nextDay, . priority) … Մมʹ͢Δ func doSomething(_ arg:
Any, option: ShippingOptions…) {…}
func doSomething(_ arg: Any, option: ShippingOptions…) { if option.contains(.nextDay) {
… } if option.contains(. secondDay) { … } } ࣮ଆʹ"SSBZ͕དྷΔͷͰมߋͳ͠
·ͱΊ ϝιουͷΦϓγϣϯΛ ؆୯ʹఆ͍͚ٛͨͩ͠Ͱ͋ΕΞϦͳͷͰ
͓ΘΓɻ