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SE-XXXX Function Builders を読み解く / Reading the s...
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Kuniwak
PRO
July 08, 2019
Programming
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1k
SE-XXXX Function Builders を読み解く / Reading the spec of Function Builders
Kuniwak
PRO
July 08, 2019
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Transcript
4&9999 'VODUJPO#VJMEFST ΛಡΈղ͘ Kuniwak - DeNA Co.,Ltd. 2019.07.08
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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#VJMEFST্ΛԼʹίϯύΠϥ͕มܗ͢Δ༷ʢະ֬ఆʣ
w ϦετߏͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFSΞϊςʔγϣϯ ͱGVODUJPOCVJMEFSܕΛೖΕ·͢ w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾϒϩοΫͷ %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ ༁ͯ͠ίϯύΠϧ͠·͢ ·ͱΊɿ'VODUJPO#VJMEFSTͱ
7
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ຖिਫ༵ʹࣾͰ։࠵͞Ε͍ͯΔɺ 4XJGU8FEOFTEBZͱ͍͏ษڧձͱ ಉ͡ܗࣜͰΏΔΏΔΈ͍͖ͯ·͢ 9
10 4XJGU8FEOFTEBZൃͷ4XJGUͷߩݙ
Ͱݟ͍͖ͯ·͠ΐ͏
https://forums.swift.org/t/important- evolution-discussion-of-the-new-dsl- feature-behind-swiftui/25168 12 TXJGUFWPMVUJPOͰͷެ։ͱಉ࣌ʹGPSVNQPTU͞ΕͨίϝϯτͰ͢ɻ
https://github.com/apple/ swift-evolution/pull/1046 13 TXJGUFWPMVUJPO্Ͱ࠷৽ͷͷΛѻ͍·͢ɻ͔ͨ͠͠Β GPSVNͰ͞Βʹ͕ٞਐΜͰ͍Δ͔͠Ε·ͤΜ͕͝༰͍ࣻͩ͘͞ɻ
https://docs.swift.org/swift- book/ReferenceManual/ AboutTheLanguageReference.html 14 TUBUFNFOUFYQSFTTJPOΛΔͨΊͷࢿྉͰ͢ɻ
w ϦετߏͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFS ΞϊςʔγϣϯͱGVODUJPOCVJMEFSܕΛೖΕ·͢ w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾϒϩοΫͷ %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ ༁ͯ͠ίϯύΠϧ͠·͢ 'VODUJPO#VJMEFSTͱ
15