Swift5のOwnership

Transcript

1. Swift5ͷOwnership ΑΓࡉ͔͍ϝϞϦ؅ཧ
2. ࣗݾ঺հ • ࢁ಺Ᏼޗ @8pockets • Python, Go, PHP, Swift, C++ • swiftྺ൒೥
3. ໨࣍ • Swift5ʹ͍ͭͯ • ݱঢ়ͷ՝୊ͱOwnershipಋೖͷཧ༝ • Ownershipͷ̏ͭͷػೳ
4. Swift5ʹ͍ͭͯ Early 2019 ϦϦʔε༧ఆ • ABI(Application Binary Interface)ͷ҆ఆԽ • ඪ४ϥΠϒϥϦʹඞཁͱͳΔδΣωϦΫε • API resilience • Memory ownership model ࢀߟɿhttps://github.com/apple/swift-evolution
5. Ownershipಋೖͷཧ༝
   $16ͷੑೳΛ׆͔͖͠Δ
6. ݱঢ়ͷ՝୊ • ࢀরΧ΢ϯτͱϢχʔΫੑͷݕࠪΦʔόʔϔου • ͍ͭͰ΋஋ΛίϐʔͰ͖Δঢ়ଶͩͱόοϑΝ͕Ұ ൠʹώʔϓ֬อ͞ΕΔɻελοΫ֬อʹ͢ΔͱΑ Γޮ཰త SwiftͰ͸COW஋ܕ͕޿͘࢖ΘΕ͖ͯͨɻ͚Ͳ͍͘ Β͔ͷ೉఺΋͋Δɻ
7. ݱঢ়ͷ՝୊ •ίϐʔΦϯϥΠτ (Copy-On-Write) ίϐʔཁٻ͞Εͯ΋ɺίϐʔΛͨ͠;ΓΛͯ͠ɺͱΓ ͋͑ͣݪຊΛͦͷ··ࢀর͢Δɺݪຊ·ͨ͸ίϐʔͷ ͲͪΒ͔Λॻ͖׵͑Α͏ͱͨ࣌͠ʹίϐʔ͕ى͜Δ ͜ΕʹΑͬͯ͋Δఔ౓ͷύϑΥʔϚϯεͷ໰୊ΛΧόʔ ͍ͯͨ͠ɻ ΑΓߴ౓ͳνϡʔχϯάΛՄೳʹͨ͠ͷ͕Ownership
8. Ownershipಋೖͷཧ༝ ͜Ε·ͰϝϞϦίϐʔ͍ͯͨ͠৔໘ͰɺϦιʔεΛି͠ ͨΓआΓͨΓͰ͖ΔΑ͏ʹͳΓɺΑΓߴ଎ʹॲཧ͕ॻ͚ Δ ར༻έʔε • Ի੠ॲཧͳͲͷϦΞϧλΠϜੑΛඞཁͱ͢Δॲཧ • αʔόʔαΠυSwift
9. Ownershipͷ̏ͭͷػೳ
10. Ownershipͷ̏ͭͷػೳ • ഉଞଇ - The Law of Exclusivity • shared஋ - Shared values • ίϐʔෆՄೳͳܕ - moveonly
11. ഉଞଇ • Swift4ͰϦϦʔεࡁ • ͋Δ஋΁ͷॻ͖ࠐΈΞΫηε͕ഉଞతͰ͋Δ ࣄΛڧ੍͢ΔɻͦͷଞͷΞΫηε͕ಉ࣌ʹੜ ͡ΔࣄΛېࢭ
12. ഉଞଇ 
    ؔ਺ͷJOPVUҾ਺ʹม਺Λ౉͢
    GVOD
    GPP @
    UNQ
    JOPVU
    4USJOH
    @
    UNQ
    JOPVU
    4USJOH \^
    WBS
    B
    4USJOH
    
    lUFTU
    GPP B
    B
    
    ˠিಥ
    
    NVUBUJOH
    GVOD
    ͳϝιουΛݺͿ
    WBS
    Y
    
    
    FYUFOTJPO
    *OU
    \
    
    
    NVUBUJOH
    GVOD
    BTTJHO3FTVMU0G @
    GVODUJPO
    
    
    *OU
    \
    
    
    
    
    TFMG
    
    GVODUJPO
    
    
    
    
    ^
    ^
    YBTTJHO3FTVMU0G
    \
    Y
    
    
    ^
    
    ˠিಥ
13. shared஋ GVOD
    TBNQMF WBMVF
    TIBSFE
    TUSJOH
    \
    
    WBMVFม਺͸MFUͷΑ͏ʹѻΘΕΔɻ
    ^ ίϐʔ͕Ͱ͖ͳ͍ܕΛ࡞ΕΔΑ͏ʹͳΔ
14. shared஋ ௨ৗͷҾ਺ ؔ਺Λݺͼग़͢ࡍʹ஋͕ίϐʔ͞ΕΔͨΊɺ
    ίετ͕͔͔Δ inoutࢀর ͦͷετϨʔδ΁ͷϙΠϯλΛ౉͚ͩ͢Ͱ͋Γɺ ͦͷΑ͏ͳίϐʔίετ͕͔͔Βͣߴ଎
    ॻ͖ࠐΈՄೳ sharedࢀর JOPVUͷಡΈऔΓઐ༻
    ݺͼग़͠ଆʹΞϯύαϯυ  Λ͚ͭΔඞཁ͕ͳ͍
15. ίϐʔෆՄೳͳܕ NPWFPOMZ
    TUSVDU
    )PHF
    \^
    WBS
    B
    
    )PHF
    
    B
    ͔Β
    C
    ʹ
    Ϧιʔεͷॴ༗ݖ͕Ҡಈ
    
    B͸ࣗಈͰղ์͞ΕΔ
    WBS
    C
    
    NPWF B
    
    ίϯύΠϧΤϥʔ
    QSJOU B ίϐʔ͕Ͱ͖ͳ͍ܕΛ࡞ΕΔΑ͏ʹͳΔ
16. ίϐʔෆՄೳͳܕ ม਺͸ശͰ͸ͳ͘ɺ஋ʹ͚ͭͨϥϕϧ WBS
    B
    
    )PHF
    WBS
    C
    
    NPWF B ॴ༗ऀ͕͍ͳ͘ͳͬͨϦιʔε͸ࣗಈͰղ์͞ΕΔ
17. END