Preparing for Swift 5 Ownership

Swift 5 の Ownership に備える

try! Swift Tokyo 2018 #tryswiftconf
https://www.tryswift.co/events/2018/tokyo/en/

1. Preparing for Swift 5 Ownership <4XJGU
   
   ͷ0XOFSTIJQʹඋ͑Δ>
2. Kuriyama Toru <܀ࢁ
   ప> iOS Engineer at Sansan app (iOS/Android) “Business card-based contact management” Twitter: @kotetuɹɹɹɹɹɹ Github: @kotetuco
3. OwnershipManifesto.md (in GitHub - apple/swift) ഉଞଇ͸4XJGUͰ࣮૷ࡁΈ
   (swift-evolution’s proposal : SE-0176) Ownership
4. ίϐʔ΍ࢀরʹର͢ΔΑΓࡉ੍͔͍ޚͷ࣮ݱ
   ΑΓߴ౓ͳύϑΥʔϚϯενϡʔχϯά͕Մೳʹ Feature1: Advanced memory management
5. Example (shared values) func distance(start: shared CGPoint, end: shared CGPoint) -> Double { ... } let result = distance(start: CGPoint(x: 0, y: 0), end: CGPoint(x: 10, y: 10))
6. Example (shared values) func distance(start: shared CGPoint, end: shared CGPoint) -> Double { ... } let result = distance(start: CGPoint(x: 0, y: 0), end: CGPoint(x: 10, y: 10)) not copied not copied
7. func distance(start: shared CGPoint, end: shared CGPoint) -> Double { ... } let result = distance(start: CGPoint(x: 0, y: 0), end: CGPoint(x: 10, y: 10)) Example (shared values) not copied read-only not copied read-only
8. Non-copyable types ίϐʔෆՄೳͳܕ ҉໧తͳίϐʔΛ੍ݶ͢Δ
   JavaͷAtomicBooleanͷΑ͏ͳදݱ͕Մೳʹ moveonly struct Array<Element> { ... }
9. ࢖͍͜ͳ͢ʹ͸ֶशίετ͕͔͔Δ
   ͳ͔ͳ͔ফ͑ͳ͍ίϯύΠϧΤϥʔ
   ઌൃͷRustͰ΋ֶशίετͷߴ͕͞՝୊ʹ Feature2: Ownership is not easy
10. Ownership͸ഉଞଇҎ֎͸ΦϓτΠϯػೳ
    SwiftͰ͸OwnershipΛ஌Βͳͯ͘΋ࢧো͸ͳ͍
    ͜Ε·Ͱͱಉ͡ॻ͖ํͰ΋0,
    RustͰ͸OwnershipΛ஌Βͳ͍ͱॻ͚ͳ͍ Feature3: Opt-in
11. Conclusions 1. ϝϞϦΞΫηε΍ίϐʔʹ͍ͭͯߴ౓ͳ੍ޚ ͕Ͱ͖Δ 2. ֶशίετ͕͔͔Δ 3. ࢖͏͔Ͳ͏͔Λબ୒͢Δ͜ͱ͕Ͱ͖Δ
12. Referenced by • https://github.com/apple/swift/blob/master/docs/ OwnershipManifesto.md • https://github.com/apple/swift-evolution/blob/master/proposals/ 0176-enforce-exclusive-access-to-memory.md • https://qiita.com/omochimetaru/items/c5f0eabde516e4713367 • https://github.com/omochi/swift-ownership-jp/blob/master/ OwnershipManifesto.md • https://github.com/rust-lang/rust-roadmap
13. I hope you'll enjoy it !
14. Thanks!