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

by Kuniwak

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4&9999  'VODUJPO#VJMEFST  ΛಡΈղ͘ Kuniwak - DeNA Co.,Ltd. 2019.07.08

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"CPVUNF

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

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ࠓճ͓఻͍͑ͨ͜͠ͱ

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4XJGU6*ͷཁૉٕज़Ͱ͋Δ  'VODUJPO#VJMEFSTͷ  ఏҊҙਤͱৄࡉΛֶͿ 5

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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#VJMEFST͸্ΛԼʹίϯύΠϥ͕มܗ͢Δ࢓༷ʢະ֬ఆʣ

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w ໦Ϧετߏ଄ͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFSΞϊςʔγϣϯ ͱGVODUJPOCVJMEFSܕΛೖΕ·͢ w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾ਺ϒϩοΫ಺ͷ  %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ΁  ຋༁ͯ͠ίϯύΠϧ͠·͢ ·ͱΊɿ'VODUJPO#VJMEFSTͱ͸ 7

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ൃදܗࣜ

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ຖिਫ༵೔ʹࣾ಺Ͱ։࠵͞Ε͍ͯΔɺ  4XJGU8FEOFTEBZͱ͍͏ษڧձͱ  ಉ͡ܗࣜͰΏΔΏΔΈ͍͖ͯ·͢ 9

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10 4XJGU8FEOFTEBZൃͷ4XJGU΁ͷߩݙ

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Ͱ͸ݟ͍͖ͯ·͠ΐ͏

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

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

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

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w ໦Ϧετߏ଄ͷߏஙΛॿ͚Δ%4-తͳݴޠػೳΛೖΕ͍ͨ w Ϣʔβʔ͕ఆٛͷͨΊͷ!GVODUJPO#VJMEFS  ΞϊςʔγϣϯͱGVODUJPOCVJMEFSܕΛೖΕ·͢ w ίϯύΠϥ͕GVODUJPOCVJMEFSܕͷҾ਺ϒϩοΫ಺ͷ  %4-ʢ4XJGUͷαϒηοτʣΛมܗͯ͠4XJGUݴޠ΁  ຋༁ͯ͠ίϯύΠϧ͠·͢ 'VODUJPO#VJMEFSTͱ͸ 15