SE-XXXX Function Builders を読み解く / Reading the spec of Function Builders

Transcript

1. 4&9999

   'VODUJPO#VJMEFST

   ΛಡΈղ͘
   Kuniwak - DeNA Co.,Ltd.
   2019.07.08
   

   View Slide

2. "CPVUNF
   

   View Slide

3. ,VOJXBL
   w ॴଐˠ
   • github.com/Kuniwak
   • qiita.com/Kuniwak
   w ߏจղੳ΍୯ମςετ͕޷෺
   w "QQ$PEF࢖͍
   3
   

   View Slide

4. ࠓճ͓఻͍͑ͨ͜͠ͱ
   

   View Slide

5. 4XJGU6*ͷཁૉٕज़Ͱ͋Δ

   'VODUJPO#VJMEFSTͷ

   ఏҊҙਤͱৄࡉΛֶͿ
   5
   

   View Slide

6. 6
   @TupleBuilder
   func build() -> (Int, Int, Int) {
   1
   2
   3
   }
   func build() -> (Int, Int, Int) {
   let _a = 1
   let _b = 2
   let _c = 3
   return TupleBuilder.buildBlock(_a, _b, _c)
   }
   'VODUJPO#VJMEFST͸্ΛԼʹίϯύΠϥ͕มܗ͢Δ࢓༷ʢະ֬ఆʣ
   

   View Slide

7. w ໦Ϧετߏ଄ͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ
   w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFSΞϊςʔγϣϯ
   ͱGVODUJPOCVJMEFSܕΛೖΕ·͢
   w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾ਺ϒϩοΫ಺ͷ

   %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ΁

   ຋༁ͯ͠ίϯύΠϧ͠·͢
   ·ͱΊɿ'VODUJPO#VJMEFSTͱ͸
   7
   

   View Slide

8. ൃදܗࣜ
   

   View Slide

9. ຖिਫ༵೔ʹࣾ಺Ͱ։࠵͞Ε͍ͯΔɺ

   4XJGU8FEOFTEBZͱ͍͏ษڧձͱ

   ಉ͡ܗࣜͰΏΔΏΔΈ͍͖ͯ·͢
   9
   

   View Slide

10. 10
    4XJGU8FEOFTEBZൃͷ4XJGU΁ͷߩݙ
    

    View Slide

11. Ͱ͸ݟ͍͖ͯ·͠ΐ͏
    

    View Slide

12. https://forums.swift.org/t/important-
    evolution-discussion-of-the-new-dsl-
    feature-behind-swiftui/25168
    12
    TXJGUFWPMVUJPOͰͷެ։ͱಉ࣌ʹGPSVN΁QPTU͞ΕͨίϝϯτͰ͢ɻ
    

    View Slide

13. https://github.com/apple/
    swift-evolution/pull/1046
    13
    TXJGUFWPMVUJPO্Ͱ࠷৽ͷ΋ͷΛѻ͍·͢ɻ΋͔ͨ͠͠Β

    GPSVNͰ͞Βʹٞ࿦͕ਐΜͰ͍Δ͔΋͠Ε·ͤΜ͕͝༰͍ࣻͩ͘͞ɻ
    

    View Slide

14. https://docs.swift.org/swift-
    book/ReferenceManual/
    AboutTheLanguageReference.html
    14
    TUBUFNFOU΍FYQSFTTJPOΛ஌ΔͨΊͷࢿྉͰ͢ɻ
    

    View Slide

15. w ໦Ϧετߏ଄ͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ
    w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFS

    ΞϊςʔγϣϯͱGVODUJPOCVJMEFSܕΛೖΕ·͢
    w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾ਺ϒϩοΫ಺ͷ

    %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ΁

    ຋༁ͯ͠ίϯύΠϧ͠·͢
    'VODUJPO#VJMEFSTͱ͸
    15
    

    View Slide