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この実装には問題がある!
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gomi_ningen
August 17, 2016
Technology
1.1k
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この実装には問題がある!
Swiftで再帰関数を書くときとかに起きる問題とワークアラウンド、そして少し先の未来の話
gomi_ningen
August 17, 2016
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Transcript
LZPCBTIJTXJGU !HPNJ@OJOHFO ͜ͷ࣮ʹ͕͋Δʂ
ࣗݾհ ϥϏοτϋεࣾͰಇࣾ͘ச৽ੜ ɾ+BWB 4DBMB 4XJGU $ 1)1 '#"4*$ͳͲ ɾJ04։ൃॳΊͯ͘Β͍
ɾຊͪ͝͏͞Ϣʔβʔάϧʔϓ +(6( ɾͪ͝͏ؔ͞࿈ͷΤϯδχΞϦϯάͷ͓ࣄґཔ͓͓ͪͯ͠Γ·͢ ͕࣌ؒͳ͍ͷͰࣗݾհׂѪ͠·͢ !HPNJ@OJOHFO
ࠓ͢༰ ඌݺͼग़͠ͱͦͷपลͷ͓ ඌݺͼग़͠ɾඌ࠶ؼͱʁʢʣ ؆୯ͳؔͷ࣮ʹ͍ͭͯߟ͑ͳ͕Βɺඌ࠶ؼͱԿ͔Λ͓͞Β͍ ࠶ؼͬΆ͍͚Ͳ࣮ϧʔϓͳ࣮ʢʣ ϧʔϓͳΒελοΫͷൃੜ͠ͳ͍ͷͰɺ࠶ؼ෩ʹΞϧΰϦζϜΛ
࣮Ͱ͖Δ͕ɺ࣮ࡍϧʔϓʹͳΔΑ͏ͳίʔυΛॻ͍ͯΈΔ 4XJGUͱඌݺͼग़͠ͷͪΐͬͱະདྷͷʢʣ 4XJGUͱ͔
ඌݺͼग़͠ɾඌ࠶ؼͱ
؆୯ͳؔʹ͍ͭͯߟ͍͑ͯ͘ ͔ΒO·Ͱͷ ͷΛฦؔ͢USJΛ࣮͍ͨ͠ USJ O
O O
؆୯ͳؔʹ͍ͭͯߟ͍͑ͯ͘ ͔ΒO·Ͱͷ ͷΛฦؔ͢USJΛ࣮͢Δ USJ O
O O ͍͍ͩͨ͜Μͳ͔Μ͡ʁ
؆୯ͳؔʹ͍ͭͯߟ͍͑ͯ͘ ͔ΒO·Ͱͷ ͷΛฦؔ͢USJΛ࣮͢Δ USJ O
O O σΧ͍ΛҾʹͯ͠ݺͼग़͢ͱࢮ͵ ︎͍ΘΏΔελοΫΦʔόʔϑϩʔͱ͍͏ͷ
؆୯ͳؔʹ͍ͭͯߟ͍͑ͯ͘ ͔ΒO·Ͱͷ ͷΛฦؔ͢USJΛ࣮͢Δ USJ O
O O ࣮ߦதͷαϒϧʔνϯʹؔ͢ΔใΛελοΫʹੵΜͰ͍ͨ͘Ίɺ ͔ؔΒؔΛݺͼग़͠·͘ΔͱελοΫ͔ΒҲΕͯ͠·͏
؆୯ͳؔʹ͍ͭͯߟ͍͑ͯ͘ αϒϧʔνϯͰܭࢉ͕͍݁ͯ͠ΕελοΫϑϨʔϜੜ͞Εͳ ͍ͷͰɺ୯७ʹXIJMFϧʔϓͰॻ͚Α͍
ίʔυͱͯͪ͠ΐͬͱݟ௨͕͠ѱ͍ʁ ࠶ؼͰ͜ΕΛ࣮ݱ͢Δํ๏ͳ͍ͷ͔ʁ
ඌݺͼग़͠ ͋Δϧʔνϯ͕ɺଞͷϧʔνϯΛݺͼग़ͯ͠ΓΛड͚औͬͨͱͯ͠ɺ ͦΕΛฦ͢Ҏ֎ͷૢ࡞Λ͠ͳ͍ͱ͖ɺඌݺͼग़͠Ͱ͋Δͱ͍͏ ‐︎ݴ༿ʹ͢Δͱ͍͕͜͠ίʔυΛݟΕ୯७
None
ඌݺͼग़͠ 4XJGUͷॲཧܥɺ࠷దԽΦϓγϣϯΛ༗ޮʹ͢Δͱ ΄΅΄΅ඌݺͼग़͠ΛελοΫϑϨʔϜΛੜ͠ͳ͍ܗͷ ΞηϯϒϦίʔυʹมͯ͘͠ΕΔ ʢ͜ΕΛඌݺͼग़͠ͷআڈͱΑΜͩΓ͢ΔΒ͍͠ʣ ࠷దԽ͋ΓTXJGUDr0QBUIUPpMFTXJGU ࠷దԽͳ͠TXJGUDr0OPOFQBUIUPpMFTXJGU
ͭ·Γઌ΄Ͳͷྫͷؔɺ ඌݺͼग़͠ͷܗʹͯ͋͛͠Ε ࠶ؼΛͬͨܗ͔ͭେ͖ͳҾͰ ؔΛݺͼग़͢͜ͱ͕Ͱ͖Δͣʂ
؆୯ͳؔΛඌݺͼग़͠ʹ͢Δ FMTF۟ͷ΄͏͕ɺඌݺͼग़͠ʹͳ͍ͬͯΔɻಛʹࣗࣗΛ࠶ؼత ʹඌݺͼग़͢͠Δͱ͖ɺඌ࠶ؼݺͼग़͠ͱ͍͏ɻ
ͪΖΜQMBZHSPVOE্Ͱ࠷దԽ͕͔͔Βͳ͍ͷͰɺ Ͱ͔͍ҾͰݺͼग़͢ͱࢮ͵
͜ͷ࣮ʹ͕͋Δʂ J04049ϓϩμΫτ։ൃ্ɺ͕ൃੜ͢Δ͜ͱكͩͱࢥ͏͕ ҰԠบΛ͚ͭΔͱɺҎԼͷΑ͏ͳ͕͋Δʢ͜ͱʹ͓ͯ͘͠ʣ ɾ࣮ࡍʹඌݺͼग़͠আڈ͕͔͔Δͱ͍͏อূͳ͍ ɾQMBZHSPVOEͰσΧ͍ҾͰݺͼग़͍ͨ͠ͱͯ͠ແཧ ࣮ࡍɺલऀநతͳϥΠϒϥϦΛઃܭ͢Δ։ൃऀʹͱͬͯएׯ· ͍͠෦͕͋Δ͔͠Εͳ͍
࠶ؼͬΆ͍͚Ͳ࣮ϧʔϓͳ࣮ Λ࡞Ε͕ղܾ͢Δ
४උϑϨʔϜϫʔΫͷ࣮ ࠶ؼͬΆ͍ίʔυΛϧʔϓʹม͢ΔͨΊͷԼ४උ
ؔͷ࣮෦ ී௨ͷ࠶ؼͬΆ͍งғؾ
ҾΛͰݺͼग़ͯ͠ࢮͳͳ͍ʂʂʂʂʂʂʂʂʂ
ͪΐͬͱະདྷͷ4XJGUͷ
!UBJMSFDΞϊςʔγϣϯͷಋೖ ɾ4DBMBͱಉ༷ͷ!UBJMSFDΞϊςʔγϣϯͷಋೖఏҊJTTVF ɾ4XJGUͰɺ΄΅ؒҧ͍ͳ͘ೖΒͳ͍ ɾ͔͠͠ɺ4XJGUͰೖΔՄೳੑ͋Δ
IUUQTHJUIVCDPNBQQMFTXJGUFWPMVUJPOQVMMpMFT
·ͱΊ ɾ4XJGUʹඌ࠶ؼআڈΛఆͨ͠ίʔυͰ͋Δ͜ͱΛ ໌ࣔతʹએݴ͢ΔͨΊͷݴޠػೳ͕ଘࡏ͠ͳ͍ ɾ΄΅ඌ࠶ؼతͳهड़ͰελοΫϑϦʔͳ࣮Λ͢Δ ϑϨʔϜϫʔΫ؆୯ʹࣗ࡞Ͱ͖Δ ɾͱ͍͑ৗͷ4XJGUϓϩάϥϛϯάͰ͜ΕΛߟྀ͠ͳ͚Ε ͳΒͳ͍έʔεඇৗʹ·ΕͰ͋Δ ɾ ίϯϏωʔλΛେྔʹؚΉϥΠϒϥϦΛॻ͘ͱ͖ߟྀ͕ඞཁ
ɾ 4XJGUʹ͚ͯ4DBMBͷ!UBJMSFDతͳΞϊςʔγϣϯ͕ ೖΔ͔Ͳ͏͔ͷݕ౼͕ਐΉݟ௨͠