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ू·ΕSwift޷͖ʂSwiftѪ޷ձ vol.80 @ DeNA 2024/03/07 @DeNA Catch Up with Swift 5.10 ojun - DeNA Co., Ltd.

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ࣗݾ঺հʢojunʣ • name: ojun • 2023೥৽ଔೖࣾ • iOSΤϯδχΞ @ojun_9

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Catch Up with Swift 5.10

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Ҿ༻IUUQTXXXTXJGUPSHCMPHTXJGUSFMFBTFE Swift 5.10 ͕ϦϦʔε͞Ε·ͨ͠ 🎉

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Ҿ༻IUUQTXXXTXJGUPSHCMPHTXJGUSFMFBTFE Swift 5.10 ͕ϦϦʔε͞Ε·ͨ͠ 🎉

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ࠓ೔࿩͢͜ͱ

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Catch Up with Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables

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SE-0404: Allow Protocols to be Nested in Non-Generic Contexts

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SE-0404: Allow Protocols to be Nested in Non-Generic Contexts Swift 5.10·Ͱ͸ɺඇδΣωϦοΫͳߏ଄ମɾΫϥεɾྻڍܕɾΞΫλʔ಺ʹ ଞͷಉྨͷܕΛωετ͢Δ͜ͱ͸Մೳͩͬͨ ҰํͰɺprotocol Λωετ͢Δ͜ͱ͸ෆՄೳͩͬͨ ͜ͷϓϩϙʔβϧʹΑΓɺωετ͞Εͨ protocol Λදݱ͢Δ͜ͱ͕Մೳͱͳͬͨ

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Ϟνϕʔγϣϯ ଞͷܕͷதʹܕΛωετͰ͖Δͱ͍͏ݱࡏͷػೳʹΑΓɺʢ៉ྷͰࣗવͳʣܕͷ είʔϓΛදݱ͢Δ͜ͱ͕Մೳʹͳ͍ͬͯΔ ྫ͑͹ɺString.UTF8View ͸ String ͷதʹωετ͞Εͨ UTF8View ͱ͍͏ߏ଄ମͰ͋Δ ͜ͷ໊લ͔ΒɺUTF8View ͕ String ͷ UTF-8෦෼ʹΞΫηε͢Δ ΠϯλʔϑΣʔεͰ͋Δ͜ͱ͕໌֬ʹͳ͍ͬͯΔ ಉ༷ͷ͜ͱΛ protocol Ͱ΋ߦ͑ΔΑ͏ʹ͍ͨ͠

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protocolΛఆٛ

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protocolΛఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ

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protocolΛఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ

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protocolΛఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ protocolʹ४ڌ͢ΔܕͷΠϯελϯεΛ ड͚औΓɺͦͷ execute ϝιουΛ ݺͼग़͢

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protocolΛఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ protocolʹ४ڌͤͨ͞ struct Λఆٛ ϝιουͷৄࡉ protocolʹ४ڌ͢ΔܕͷΠϯελϯεΛ ड͚औΓɺͦͷ execute ϝιουΛ ݺͼग़͢

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ར༻ࣗମ͸ݶఆత ؔ਺಺͕ෳࡶʹͳΔ͜ͱΛݴޠ੍͕ݶ͢Δ ཧ༝΋ͳ͍ ↓ ࠨͷΑ͏ͳॻ͖ํ͕։์͞Ε͍ͯΔ

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Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables 􀇻

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SE-0411: Isolated Default Value Expressions

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ message ͸ SomeGlobalActor ʹִ཭͞Ε͍ͯΔ

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ message ͸ SomeGlobalActor ʹִ཭͞Ε͍ͯΔ ॳظԽ͕ҟͳΔΞΫλʔʹΑͬͯߦΘΕΔͨΊ σʔλڝ߹ͷՄೳੑ͕͋Δ ͜Ε͸ɺҟͳΔΞΫλʔ͕ಉ࣌ʹҟͳΔεϨουͰ ࣮ߦ͞ΕΔͨΊɺ༧ظ͠ͳ͍λΠϛϯάͰ͜ΕΒͷ ϓϩύςΟ͕ॳظԽ͞ΕΔՄೳੑ͕͋ΔͨΊ

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Stored PropertyͷσϑΥϧτ஋͸ɺͦͷϓϩύςΟ͕ ଐ͢Δ Actor ͱಉ͡෼཭Λ࣋ͭ΂͖ Swift 5.10͔Β͸nonisolated init͔ΒΞΫλʔ෼཭͞Εͨ ϓϩύςΟͷॳظԽΛߦ͏͜ͱ͸Ͱ͖ͳ͘ͳΓ σʔλڝ߹͕ഉআ͞ΕΔ

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initΛasyncʹ͠ɺ͔ͭɺ಺෦Ͱ await ΩʔϫʔυΛ෇༩ͤ͞Δ ͜ͱͰॳظԽΛߦ͏͜ͱ͕ՄೳʹͳΔ

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Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables 􀇻 􀇻

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SE-0412: Strict Concurrency for Global Variables

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SE-0412: Strict Concurrency for Global Variables άϩʔόϧͳঢ়ଶɾม਺͸ɺϓϩάϥϜͷͲͷίϯςΩετ͔ΒͰ΋ΞΫηεͰ͖Δ ͷͰɺฒߦੑͷจ຺΍σʔλִ཭ͷνΣοΫʹ͓͍ͯ՝୊͕͋Δ ϩʔΧϧʹଘࡏ͢ΔΩϟϓνϟ͞Ε͍ͯͳ͍ม਺͸ϩʔΧϧͷίϯςΩετ͔ΒͷΈ ΞΫηεՄೳͰɺ͜ΕʹΑΓ҉໧తʹִ཭͞Ε͍ͯΔ ஋ܕɾࢀরܕͷϓϩύςΟ͸ִ཭͢Δ͜ͱ͕Մೳ ҰํͰɺάϩʔόϧม਺͸Ͳ͔͜ΒͰ΋ΞΫηεՄೳͳͷͰɺϩʔΧϧɾ஋ܕɾࢀরܕͱ ҟͳΓִ཭͢Δ͜ͱ͕೉͍͠

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SE-0412: Strict Concurrency for Global Variables Swift 5.10ʢͷݫ֨ͳฒߦੑνΣοΫͷԼͰ͸ʣ͢΂ͯͷάϩʔόϧม਺Λ άϩʔόϧΞΫλʔʹִ཭͢Δ͔ɺҎԼͷ྆ํͰ͋Δ͜ͱ͕ཁٻ͞ΕΔ 1. ෆมͰ͋Δ͜ͱ 2. SendableͰ͋Δ͜ͱ τοϓϨϕϧͷάϩʔόϧม਺͸طʹ MainActor ʹ҉໧తʹִ཭͞Ε͍ͯΔ Ώ͑ʹ্هͷཁ݅Λࣗಈతʹຬͨ͢

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SE-0412: Strict Concurrency for Global Variables Ұ෦ͷঢ়گͰ͸ɺಠࣗͷσʔλִ཭؅ཧʹґଘͰ͖ΔΑ͏ʹ੩తνΣοΫΛ ΦϓτΞ΢τ͢Δඞཁ͕͋Δ৔߹͕͋Δ ྫ: σʔλΞΫηεͷ௚ྻԽΛอূ͢Δಠࣗͷσʔλִ཭؅ཧʹཔΔඞཁ͕͋Δ৔߹ nonisolated(unsafe) Λɺάϩʔόϧม਺ʹ࢖༻͢Δ͜ͱͰΦϓτΞ΢τग़དྷΔ

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SE-0412: Strict Concurrency for Global Variables Ұ෦ͷঢ়گͰ͸ɺಠࣗͷσʔλִ཭؅ཧʹґଘͰ͖ΔΑ͏ʹ੩తνΣοΫΛ ΦϓτΞ΢τ͢Δඞཁ͕͋Δ৔߹͕͋Δ ྫ: σʔλΞΫηεΛγϦΞϥΠζ͢ΔάϩʔόϧϩοΫͱؔ࿈෇͚ΒΕ͍ͯΔ৔߹ͳͲ nonisolated(unsafe) Λɺάϩʔόϧม਺ʹ࢖༻͢Δ͜ͱͰΦϓτΞ΢τग़དྷΔ

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SE-0412: Strict Concurrency for Global Variables Ұ෦ͷঢ়گͰ͸ɺಠࣗͷσʔλִ཭؅ཧʹґଘͰ͖ΔΑ͏ʹ੩తνΣοΫΛ ΦϓτΞ΢τ͢Δඞཁ͕͋Δ৔߹͕͋Δ ྫ: σʔλΞΫηεΛγϦΞϥΠζ͢ΔάϩʔόϧϩοΫͱؔ࿈෇͚ΒΕ͍ͯΔ৔߹ͳͲ nonisolated(unsafe) Λɺάϩʔόϧม਺ʹ࢖༻͢Δ͜ͱͰΦϓτΞ΢τग़དྷΔ ͜ΕʹΑΓɺάϩʔόϧม਺ͷσʔλִ཭ͷ੩తνΣοΫ͸ແޮʹͳΔ ͨͩ͠ɺ͜ͷଐੑΛ࢖༻͢Δ৔߹͸σʔλ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊͷಉظϝΧχζϜ ʢϩοΫ΍ηϚϑΥͳͲʣΛࣗ෼ୡͰ࣮૷͢Δඞཁ͕͋Δ

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Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables 􀇻 􀇻 􀇻

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SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain

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SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain @UIApplicationMain ͱ @NSApplicationMain͕ඇਪ঑ʹ @mainΛ࢖͓͏ʂ

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Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables 􀇻 􀇻 􀇻 􀇻

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SE-0327: On Actors and Initialization

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢ λεΫ͕ Actor ͷ Executor ্Ͱ࣮ߦ͞Ε͍ͯΔ৔߹ʹͷΈ ͦͷ Actor ͷִ཭͞Εͨঢ়ଶʹΞΫηεͰ͖Δ

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢ λεΫ͕ Actor ͷ Executor ্Ͱ࣮ߦ͞Ε͍ͯΔ৔߹ʹͷΈ ͦͷ Actor ͷִ཭͞Εͨঢ়ଶʹΞΫηεͰ͖Δ Actor ͷ Executor ΁ͷΞΫηεΛಘΔϓϩηε͸ λεΫ͔ΒͷΈʮඇಉظతʯʹߦΘΕΔ

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢ λεΫ͕ Actor ͷ Executor ্Ͱ࣮ߦ͞Ε͍ͯΔ৔߹ʹͷΈ ͦͷ Actor ͷִ཭͞Εͨঢ়ଶʹΞΫηεͰ͖Δ Actor ͷ Executor ΁ͷΞΫηεΛಘΔϓϩηε͸ λεΫ͔ΒͷΈʮඇಉظతʯʹߦΘΕΔ ↓ Actor ͷ֎෦͔Β Actor ͷඇಉظϝιουΛݺͼग़͢ࡍʹ͸ ՄೳͳதஅΛࣔ͢ҝʹ await ͕ඞཁʹͳΔ

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"hopping" onto the executor Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢ λεΫ͕ Actor ͷ Executor ্Ͱ࣮ߦ͞Ε͍ͯΔ৔߹ʹͷΈ ͦͷ Actor ͷִ཭͞Εͨঢ়ଶʹΞΫηεͰ͖Δ Actor ͷ Executor ΁ͷΞΫηεΛಘΔϓϩηε͸ λεΫ͔ΒͷΈʮඇಉظతʯʹߦΘΕΔ ↓ Actor ͷ֎෦͔Β Actor ͷඇಉظϝιουΛݺͼग़͢ࡍʹ͸ ՄೳͳதஅΛࣔ͢ҝʹ await ͕ඞཁʹͳΔ → ͜ͷϓϩϙʔβϧͰ͸্هͷϓϩηεͷ͜ͱΛ ʮ ExecutorͷϗοϐϯάʯͱݺΜͰΔ

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Actor ͸ Serial Executor ͱ͍͏ΩϡʔΛ͍࣋ͬͯΔ Actor ͸ϓϩύςΟ΁ͷΞΫηεΛ؅ཧ͢ΔͨΊʹ Executor Λ࢖༻͍ͯ͠Δ → ϩοΫͷΑ͏ͳ໾ׂΛՌͨ͢ λεΫ͕ Actor ͷ Executor ্Ͱ࣮ߦ͞Ε͍ͯΔ৔߹ʹͷΈ ͦͷ Actor ͷִ཭͞Εͨঢ়ଶʹΞΫηεͰ͖Δ Actor ͷ Executor ΁ͷΞΫηεΛಘΔϓϩηε͸ λεΫ͔ΒͷΈʮඇಉظతʯʹߦΘΕΔ ↓ ٯʹݴ͏ͱɺεϨουΛϒϩοΫͯ͠ΞΫηεΛ଴ͭ͜ͱ͸ Swift Concurrencyͷݪଇʹ൓͢Δ

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init ͸Non-async

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init ͸Non-async Ώ͑ʹ͜ͷதͰʢ௚઀తʹʣ͸ Executorʹϗοϐϯά͢Δ ͜ͱ͕Ͱ͖ͳ͍

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্ͷ෦෼Ͱ΋ increment() ͕ݺ͹Ε͍ͯΔͷͰ ڝ߹Λى͜͢Մೳੑ͕͋Δ

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্ͷ෦෼Ͱ΋ increment() ͕ݺ͹Ε͍ͯΔͷͰ ڝ߹Λى͜͢Մೳੑ͕͋Δ ͜ΕΛ๷͙ͨΊʹɺSwift 5.5Ͱ͸Non-Acyncͳ init ಺ʹ͓͚Δ self ͷར༻ʹ੍ݶ͕ઃ͚ΒΕͨ

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্ͷ෦෼Ͱ΋ increment() ͕ݺ͹Ε͍ͯΔͷͰ ڝ߹Λى͜͢Մೳੑ͕͋Δ ͜ΕΛ๷͙ͨΊʹɺSwift 5.5Ͱ͸Non-Acyncͳ init ಺ʹ͓͚Δ self ͷར༻ʹ੍ݶ͕ઃ͚ΒΕͨ

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্ͷ෦෼Ͱ΋ increment() ͕ݺ͹Ε͍ͯΔͷͰ ڝ߹Λى͜͢Մೳੑ͕͋Δ ͜ΕΛ๷͙ͨΊʹɺSwift 5.5Ͱ͸Non-Acyncͳ init ಺ʹ͓͚Δ self ͷར༻ʹ੍ݶ͕ઃ͚ΒΕͨ ↓ [՝୊] ͜ͷ੍ݶ͕ݫ͍͠

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ڝ߹ͷϦεΫ͕ͳ͍৔߹ʹ΋੍ݶ͕͔͔Γ warning͕ൃੜ͢Δ

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[ิ଍] nonisolated ΩʔϫʔυΛ෇༩͢Δͱ warning͸ൃੜ͠ͳ͍

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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init Ͱ͸ self ͷ੍ݶ͕ଘࡏͨ͠ ͔͠͠deinit಺ʹ͸ͦͷ੍ݶ͸ଘࡏ͠ͳ͍

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deinit ಺Ͱ΋ init ͱಉ༷ʹσʔλϨʔε͕ ൃੜ͢ΔՄೳੑ͕͋Δ

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deinit ಺Ͱ΋ init ͱಉ༷ʹσʔλϨʔε͕ ൃੜ͢ΔՄೳੑ͕͋Δ ͞Βʹɺ͜ͷඇಉظλεΫʹΑͬͯselfͷण໋Λ ʢdeinit ͷऴྃޙΛ௒͑ͯʣԆ͹ͯ͠ ͠·͏Մೳੑ͕͋Δ

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deinit ಺Ͱ΋ init ͱಉ༷ʹσʔλϨʔε͕ ൃੜ͢ΔՄೳੑ͕͋Δ ͞Βʹɺ͜ͷඇಉظλεΫʹΑͬͯselfͷण໋Λ ʢdeinit ͷऴྃޙΛ௒͑ͯʣԆ͹ͯ͠ ͠·͏Մೳੑ͕͋Δ Object 0x6000025a4200 of class Counter deallocated with non-zero retain count 2. This object's deinit, or something called from it, may have created a strong reference to self which outlived deinit, resulting in a dangling reference. ࣮ߦ͢ΔͱΫϥογϡ͢Δ

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SwiftͰ͸ΦϒδΣΫτͷࢀরΧ΢ϯτ͕ 0 ʹͳΔͱ deinit ͕ݺͼग़͞ΕΔ Ϋϥογϡʹؔͯ͠ิ଍

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SwiftͰ͸ΦϒδΣΫτͷࢀরΧ΢ϯτ͕ 0 ʹͳΔͱ deinit ͕ݺͼग़͞ΕΔ deinit ͷ࣮ߦޙʹΦϒδΣΫτͷࢀরΧ΢ϯτ͕ ࠶౓ 1 ʹ૿͑Δ͜ͱ͸ະఆٛͷৼΔ෣͍Ͱ͋Δ Ϋϥογϡʹؔͯ͠ิ଍

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SwiftͰ͸ΦϒδΣΫτͷࢀরΧ΢ϯτ͕ 0 ʹͳΔͱ deinit ͕ݺͼग़͞ΕΔ deinit ͷ࣮ߦޙʹΦϒδΣΫτͷࢀরΧ΢ϯτ͕ ࠶౓ 1 ʹ૿͑Δ͜ͱ͸ະఆٛͷৼΔ෣͍Ͱ͋Δ Ώ͑ʹࢀরΧ΢ϯτ͕2౓໨ʹ0ʹͳΔͱ ϥϯμϜͳΫϥογϡ͕ൃੜ͢ΔݪҼͱͳΔ Ϋϥογϡʹؔͯ͠ิ଍

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SwiftͰ͸ΦϒδΣΫτͷࢀরΧ΢ϯτ͕ 0 ʹͳΔͱ deinit ͕ݺͼग़͞ΕΔ deinit ͷ࣮ߦޙʹΦϒδΣΫτͷࢀরΧ΢ϯτ͕ ࠶౓ 1 ʹ૿͑Δ͜ͱ͸ະఆٛͷৼΔ෣͍Ͱ͋Δ Ώ͑ʹࢀরΧ΢ϯτ͕2౓໨ʹ0ʹͳΔͱ ϥϯμϜͳΫϥογϡ͕ൃੜ͢ΔݪҼͱͳΔ ·ͨɺࢀরܕͷ deinit ʹ͓͚Δण໋Ԇ௕ͷ ໰୊͸Ұൠతͳ໰୊ʢclass΋ؚΊͯʣ Ϋϥογϡʹؔͯ͠ิ଍

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SwiftͰ͸ΦϒδΣΫτͷࢀরΧ΢ϯτ͕ 0 ʹͳΔͱ deinit ͕ݺͼग़͞ΕΔ deinit ͷ࣮ߦޙʹΦϒδΣΫτͷࢀরΧ΢ϯτ͕ ࠶౓ 1 ʹ૿͑Δ͜ͱ͸ະఆٛͷৼΔ෣͍Ͱ͋Δ Ώ͑ʹࢀরΧ΢ϯτ͕2౓໨ʹ0ʹͳΔͱ ϥϯμϜͳΫϥογϡ͕ൃੜ͢ΔݪҼͱͳΔ ·ͨɺࢀরܕͷ deinit ʹ͓͚Δण໋Ԇ௕ͷ ໰୊͸Ұൠతͳ໰୊ʢclass΋ؚΊͯʣ ↓ কདྷͷผͷϓϩϙʔβϧͰղܾࡦΛݕ౼͢Δ ͜ͱʹͳΔ Ϋϥογϡʹؔͯ͠ิ଍

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ message ͸ SomeGlobalActor ʹִ཭͞Ε͍ͯΔ

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count ͸ MainActor ʹִ཭͞Ε͍ͯΔ message ͸ SomeGlobalActor ʹִ཭͞Ε͍ͯΔ Initʹରͯ͠ͲͷΞΫλʔִ཭Λࢦఆ͢Ε͹Α͍ͷ͔͕ ໰୊ʹͳΔɻ count ͱ message ͕ҟͳΔάϩʔόϧΞΫλʔʹ ִ཭͞Ε͍ͯΔΏ͑ʹ1ͭͷΞΫλʔִ཭Λࢦఆ͢Δ͜ͱ͕ ෆՄೳͰ͋Δ

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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Swiftͷશͯͷϊϛφϧ (nominal) ܕʢΫϥεɺߏ଄ମɺྻڍܕʣ͸ ΠχγϟϥΠβͷҕৡΛαϙʔτ͍ͯ͠·Δ ͜Ε͸ɺ͋ΔΠχγϟϥΠβ͕ผͷΠχγϟϥΠβΛݺͼग़ͯ͠ ࢒ΓͷॳظԽΛߦ͏͜ͱΛҙຯ͢Δ Initializer Delegation

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ΠχγϟϥΠβͷҕৡ͕ߦΘΕ͍ͯΔ ͨͩ͠ struct ͷ৔߹͸ɺinitΛҕৡ͢Δ৔߹ʹ͸ ͢΂ͯͷέʔεͰ self ͷ୅ೖ͔ self.init ͷ ݺͼग़͕͠ඞཁ

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ΠχγϟϥΠβͷҕৡ͕ߦΘΕ͍ͯΔ ͨͩ͠ struct ͷ৔߹͸ɺinitΛҕৡ͢Δ৔߹ʹ͸ ͢΂ͯͷέʔεͰ self ͷ୅ೖ͔ self.init ͷ ݺͼग़͕͠ඞཁ

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ΠχγϟϥΠβͷҕৡ͕ߦΘΕ͍ͯΔ ͨͩ͠ struct ͷ৔߹͸ɺinitΛҕৡ͢Δ৔߹ʹ͸ ͢΂ͯͷέʔεͰ self ͷ୅ೖ͔ self.init ͷ ݺͼग़͕͠ඞཁ Τϥʔ͕ൃੜ͢Δ

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ΠχγϟϥΠβͷҕৡ͕ߦΘΕ͍ͯΔ class ͷ৔߹͸ܧঝͷؔ܎Ͱɺҕৡ͢Δ ΠχγϟϥΠβΛ۠ผ͢Δ໨తͰ comvinience Ωʔϫʔυ͕ඞཁʹͳΔ

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actor ͷ৔߹͸ܧঝ͕ଘࡏ͠ͳ͍ ʹ΋͔͔ΘΒͣ Swift 5.5 ͷ؀ڥͰ͸ ΠχγϟϥΠβʔͷҠৡʹ͓͍ͯ convenience ΩʔϫʔυΛ࢖༻͢Δ͜ͱ͕ཁٻ͞Ε͍ͯͨ

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actor ͷ৔߹͸ܧঝ͕ଘࡏ͠ͳ͍ ʹ΋͔͔ΘΒͣ Swift 5.5 ͷ؀ڥͰ͸ ΠχγϟϥΠβʔͷҠৡʹ͓͍ͯ convenience ΩʔϫʔυΛ࢖༻͢Δ͜ͱ͕ཁٻ͞Ε͍ͯͨ ↓ Swift 5.9.1 ͷ؀ڥͩͱ convenience Ωʔϫʔυ Λ෇༩͢Δͱ warning ͕ग़ΔΑ͏ʹͳ͍ͬͯͨ ↓ ղܾࡁΈͩͱࢥΘΕΔ

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SE-0327: On Actors and Initialization 1. Non-asyncͳ init ͸ self Λ࢖ͬͯͰ͖Δ͜ͱ͕ݫ੍͘͠ݶ͞Ε͍ͯΔ 2. Actor ͷ deinit ͰσʔλϨʔε͕ൃੜ͢ΔՄೳੑ͕͋Δ 3. init ͷதͰʹৗʹ Global Actor ͷִ཭Λอ࣋͢Δ͜ͱ͕ Ͱ͖ͳ͍৔߹͕͋Δ 4. Actor ͕ܧঝΛαϙʔτ͍ͯ͠ͳ͍ʹ΋͔͔ΘΒͣ init ͷҕৡʹ͸Ϋϥεͱಉ༷ʹconvenienceΩʔϫʔυ͕ඞཁͳ͜ͱ ݱঢ়ͷ໰୊఺

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Swift 5.10 SE-0327: On Actors and Initialization SE-0383: Deprecate @UIApplicationMain and @NSApplicationMain SE-0404: Allow Protocols to be Nested in Non-Generic Contexts SE-0411: Isolated Default Value Expressions SE-0412: Strict Concurrency for Global Variables 􀇻 􀇻 􀇻 􀇻 􀇻

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͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ

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ࢀߟҾ༻จݙ https://github.com/apple/swift-evolution/blob/main/proposals/0327-actor-initializers.md https://github.com/apple/swift-evolution/blob/main/proposals/0383-deprecate- uiapplicationmain-and-nsapplicationmain.md https://github.com/apple/swift-evolution/blob/main/proposals/0404-nested- protocols.md https://github.com/apple/swift-evolution/blob/main/proposals/0411-isolated-default- values.md https://github.com/apple/swift-evolution/blob/main/proposals/0412-strict-concurrency- for-global-variables.md https://zenn.dev/koher/articles/swift-concurrency-cheatsheet