Optional(2018)年...その後

by Hideaki Tamai

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0QUJPOBM ೥ ͦͷޙ )JEFBLJ5BNBJ 1PUBUPUJQT+VMZ

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ࣗݾ঺հ )JEFBLJ5BNBJ ɾ.POFZ'PSXBSE *OD ɾJ04ΞϓϦΤϯδχΞ ɾ͘͘͢͢ʂࢠҭͯΤϯδχΞ.FFUVQ UBNBEPO !UBNBEPO

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IUUQTNPOFZGPSXBSEDPNFOHJOFFST@CMPHPQUJPOBM 0QUJPOBM ೥͚͋·͓ͯ͠ΊͰͱ͏͍͟͝·͢

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͜ΕΛػʹXBSOJOHΛ๾໓͢΂͘ ౰ࣾJ04ΤϯδχΞ͕ ෦ॺΛӽ͑ͯऔΓ૊Έ·ͨ͠ ௨ৗͷػೳ։ൃͱฒߦͯ͠໿ϲ݄

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Before

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΍ͬͨ͜ͱͦͷ̍ 4XJGU-JOU "VUPDPSSFDU

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Πϯσϯτͷௐ੔͚͔ͩͱࢥͬͯͨΒɺ ؆୯ͳwarning͸मਖ਼ͯ͘͠Εͨ func validate(_ input :(hoge: Fuga)) throws -> Void { func validate(_ input :(hoge: Fuga)) throws {

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΍ͬͨ͜ͱͦͷ̎ γϡοͱ௚ͤͦ͏ͳXBSOJOHΛফ͢

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- public final class Hoge: Fuga { + public class Hoge: Fuga { - network.request(request) { _ in } + _ = network.request(request) { _ in } ྫʣ͜͏͍͏΍ͭ

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͋ͱ͸ͪͪ͘͘஍ಓʹ XBSOJOHΛͭͿ͍ͯͬͨ͠

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ਏ͔ͬͨ΍ͭ

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Ұ෦ͷϥΠϒϥϦ͕$PDPB1PET ܦ༝͡Όͳ͍ํ๏Ͱಋೖͯ͋͠Δ ʢେ൒͸$PDPB1PETܦ༝ʣ wͲͷόʔδϣϯΛ࢖ͬͯΔ͔෼͔Βͳ͍ͷͰ࠷৽ʹΞο ϓσʔτͨ࣌͠ͷӨڹൣғ͕ݟ͑ͣɺΞοϓσʔτ͠ ͯྑ͍ͷ͔ෆ໌ w͔͠΋Ұ෦ಠ࣮ࣗ૷Λ௥Ճͯ͠࢖ͬͯΔ΍ͭ΋͋Δ

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ಠ࣮ࣗ૷Λ௥Ճͯ͠ͳ͍ ϥΠϒϥϦ wϥΠϒϥϦͷόʔδϣϯΛίϛοτϩά͔Βਪଌ ͠ӨڹൣғΛௐࠪ w$PDPB1PETʹҠߦ

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ಠ࣮ࣗ૷Λ௥Ճͯ͠Δ ϥΠϒϥϦ w൚༻తͳػೳ௥ՃͩͬͨͷͰɺϥΠϒϥϦΛGPSL͠ ͯຊՈʹQVMMSFRVFTUΛग़ͨ͠ wऔΓࠐ·Εͳ͔ͬͨϥΠϒϥϦ͸GPSLFESFQPTJUPSZ ͷϥΠϒϥϦΛ$PDPB1PETͰΠϯετʔϧ

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After

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Before

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After Ϗϧυʹ͔͔Δ͕࣌ؒϝνϟ୹ॖ͞Εͨ XBSOJOH࡟আ͚ͩͰͳ͘ɺ4XJGUରԠ΍ ίϯύΠϧΦϓγϣϯͷมߋ΋ޮՌ͕͋ͬͨͱࢥΘΕΔ

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࠷ޙͷXBSOJOH ՝ۚͷϨγʔτ͕J04ܗࣜ ˠݱࡏରԠத

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XBSOJOHΛ૿΍͞ͳ͍ औΓ૊Έ

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Ұྫ ɾϏϧυ࣌ʹ4XJGU-JOU"VUPDPSSFDU࣮ߦ ɾϏϧυʹNTҎ্͔͔͍ͬͯΔॲཧͰXBSOJOH ɾ4JEFSʢNJTTQFMMʣಋೖ ɾ%BOHFSಋೖ

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·ͱΊ w ݹ͔͘Βӡ༻͞Ε͍ͯΔϓϩμΫτͰ΋ؤுͬͯऔΓ૊Ί͹ɺXBSOJOHΛ ΄΅̌ʹग़དྷΔ w Ϗϧυ୹ॖͷऔΓ૊Έ΋ग़དྷͯϏϧυ͕࣌ؒ෼෼·Ͱ୹ॖग़དྷͨ w ෦ॺΛ·͍ͨͰXBSOJOH๾໓ʹऔΓ૊ΜͩͷͰɺࣾ಺ͷJ04ΤϯδχΞ಺Ͱ XBSOJOH΍ϦϑΝΫλϦϯάʹର͢Δҙ͕ࣝߴ·ͬͨ w XBSOJOHΛݮΒͯ͠ຬ଍͢ΔͷͰ͸ͳ͘ɺ૿΍͞ͳ͍࢓૊Έͷߏங͕େࣄ

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͝ਗ਼ௌ͋Γ͕ͱ͏͟͝ ͍·ͨ͠