SwiftにおけるMethod Dispatchについて

Transcript

1. METHOD DISPATCH@SWIFT SWIFTѪ޷ձ VOL.16 N.HAMADA

2. ࣗݾ঺հ w J04ྺ
   ೥͘Β͍
   w ੲ͸ɺNBD04ΞϓϦͷ։ൃΛ΍͍ͬͯ·ͨ͠
   w 2JJUB
   w IUUQRJJUBDPN)B/P)JUP
   w

   (JU)VC
   w IUUQTHJUIVCDPNOIBNBEB 

3. ࠓ೔ͷ͓࿩ w .FUIPE
   %JTQBUDIʹ͍ͭͯ
   w 4XJGUʹ͓͚Δ.FUIPE
   %JTQBUDIͷ͍Ζ͍Ζ 

4. ໰୊ protocol AlcoholProtocol { } extension AlcoholProtocol { func alcohol()

   -> String { return "" } } class TwoBeers { } extension TwoBeers: AlcoholProtocol { func alcohol() -> String { return "" } } let beerServer: AlcoholProtocol = TwoBeers() let myBeer = beerServer.alcohol() print(myBeer) 

5. ໰୊ protocol AlcoholProtocol { } extension AlcoholProtocol { func alcohol()

   -> String { return "" } } class TwoBeers { } extension TwoBeers: AlcoholProtocol { func alcohol() -> String { return "" } } let beerServer: AlcoholProtocol = TwoBeers() let myBeer = beerServer.alcohol() print(myBeer) print(myBeer)Ͱग़ྗ͞ΕΔͷ͸
   ͱͷͲͬͪʁ 

6. .FUIPE
   %JTQBUDIͱ͸ʁ w ιʔείʔυ্ͷʮϝιουݺͼग़͠ʯͰɺ࣮ࡍʹ ݺͼग़͞ΕΔϝιου͸ɺͲͷϝιουͳͷ͔ʁɹ ΛܾΊΔػߏ extension AlcoholProtocol { func alcohol()

   -> String { return "" } } class TwoBeers { } extension TwoBeers: AlcoholProtocol { func alcohol() -> String { return "" } } let beerServer: AlcoholProtocol = TwoBeers() let myBeer = beerServer.alcohol() ʁ 

7. .FUIPE
   %JTQBUDIͷछྨ 4UBUJD ௚઀తʹɺϝιουͷݺͼग़͠Λߦ͏ ίϯύΠϧ࣌ 75BCMF Ծ૝ςʔϒϧΛ࢖ͬͯݺͼग़͢ϝιουΛ ܾΊΔ ࣮ߦ࣌ .FTTBHF ϝοηʔδΛૹΔ͜ͱͰɺͲͷϝιουΛ

   ݺͿ͔ܾΊΔ ࣮ߦ࣌ 8JUOFTT ࢀরςʔϒϧΛ࢖ͬͯݺͼग़͢ϝιουΛ ܾΊΔ ࣮ߦ࣌ 

8. 4UBUJD
   %JTQBUDI w ίϯύΠϧ࣌ʹɺͲͷϝιο υΛݺͼग़͔͢ɺ͕ܾ·Δ TUSVDU
   #FFS4FSWFS
   \
   
   
   
   
   GVOD
   CFFS
   
   4USJOH
   \
   
   
   
   
   
   
   
   
   SFUVSO
   
   
   
   
   
   ^
   
   
   
   
   GVOD
   CFFST

   
   
   4USJOH
   \
   
   
   
   
   
   
   
   
   SFUVSO
   
   
   
   
   
   ^
   ^ DMBTT
   #FFS4FSWFS
   \
   
   
   
   
   pOBM
   GVOD
   CFFS
   
   4USJOH
   \
   
   
   
   
   
   
   
   
   SFUVSO
   
   
   
   
   
   ^
   ^ 

9. 75BCMF w Ծ૝ςʔϒϧΛ࢖ͬͯɺ ࣮ߦ࣌ʹݺͼग़͢ϝιο υΛܾΊΔ
   w Ϋϥε͸ɺԾ૝ςʔϒ ϧΛ࣋ͭ class AlcoholServer

   { func alcohol() -> String { return "" } func cheers() -> String { return "" } } class SakeMaker: AlcoholServer { override func alcohol() -> String { return "" } } 

10. 75BCMF class AlcoholServer { func alcohol() -> String { return

    "" } func cheers() -> String { return "" } } class SakeMaker: AlcoholServer { override func alcohol() -> String { return "" } } "MDPIPM4FSWFS BMDPIPM 
    "MDPIPM4FSWFS DIFFST 
    "MDPIPM4FSWFS 4BLF.BLFS BMDPIPM 
    4BLF.BLFS DIFFST 
    "MDPIPM4FSWFS 

11. .FTTBHF w .FTTBHFΛ࢖ͬͯɺͲͷ ϝιουΛݺͼग़͔͢Λ ܾΊΔ
    w 0CKFDUJWF$Ͱͷϝιου ݺͼग़͠
    w 'PVOEBUJPOΛΠϯϙʔ

    τ͢Δඞཁ͕͋Δ JNQPSU
    'PVOEBUJPO
    DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    EZOBNJD
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    
    
    
    
    EZOBNJD
    GVOD
    DIFFST
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ 

12. 8JUOFTT w ϓϩτίϧʹ४ڌ͍ͯ͠Δ ৔߹ʹ࡞ΒΕΔ
    w ϓϩτίϧͰఆٛ͞Εͨϝ ιουͷݺͼग़͠Λ͢Δͱ ͖ʹ࢖ΘΕΔ
    w σϑΥϧτ࣮૷༻ͷ

    8JUOFTT΋͋Δ QSPUPDPM
    #FFS
    \
    
    
    
    
    GVOD
    CFFS
    
    4USJOH
    ^
    QSPUPDPM
    4BLF
    \
    
    
    
    
    GVOD
    TBLF
    
    4USJOH
    ^
    TUSVDU
    "MDPIPM4FSWFS
    #FFS
    4BLF
    \
    
    
    
    
    GVOD
    CFFS
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    
    
    
    
    GVOD
    TBLF
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ 

13. ͦ͏͍͑͹ 

14. &YUFOTJPO͸Ͳ͏ͳΔ͔ʁ DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^
    FYUFOTJPO
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    DIFFST
    
    4USJOH
    \
    

    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ 

15. &YUFOTJPO͸Ͳ͏ͳΔ͔ʁ DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^
    FYUFOTJPO
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    DIFFST
    
    4USJOH
    \
    

    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ w 75BCMF #FFS4FSWFS BMDPIPM 
    #FFS4FSWFS 

16. &YUFOTJPO͸Ͳ͏ͳΔ͔ʁ DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^
    FYUFOTJPO
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    DIFFST
    
    4USJOH
    \
    

    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ w .FTTBHF
    w 8JUOFTT
    w 4UBUJD 

17. &YUFOTJPO͸Ͳ͏ͳΔ͔ʁ DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^
    FYUFOTJPO
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    DIFFST
    
    4USJOH
    \
    

    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ w .FTTBHF
    w 8JUOFTT
    w 4UBUJD 

18. &YUFOTJPO͸Ͳ͏ͳΔ͔ʁ DMBTT
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    BMDPIPM
    
    4USJOH
    \
    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^
    FYUFOTJPO
    #FFS4FSWFS
    \
    
    
    
    
    GVOD
    DIFFST
    
    4USJOH
    \
    

    
    
    
    
    
    
    
    
    SFUVSO
    
    
    
    
    
    ^
    ^ w .FTTBHF
    w 8JUOFTT
    w 4UBUJD 

19. ໰୊ protocol AlcoholProtocol { } extension AlcoholProtocol { func alcohol()

    -> String { return "" } } class TwoBeers { } extension TwoBeers: AlcoholProtocol { func alcohol() -> String { return "" } } let beerServer: AlcoholProtocol = TwoBeers() let myBeer = beerServer.alcohol() print(myBeer) print(myBeer)Ͱग़ྗ͞ΕΔͷ͸
    ͱͷͲͬͪʁ

20. ໰୊ protocol AlcoholProtocol { } extension AlcoholProtocol { func alcohol()

    -> String { return "" } } class TwoBeers { } extension TwoBeers: AlcoholProtocol { func alcohol() -> String { return "" } } let beerServer: AlcoholProtocol = TwoBeers() let myBeer = beerServer.alcohol() print(myBeer)

21. ·ͱΊ w 4XJGUͰͷ.FUIPE
    %JTQBUDIΛ؆୯ʹ·ͱΊͯΈ· ͨ͠