Swift 5 Exclusivity Enforcement

Re:valua t ion https://fril.jp/ L ead & Delight User F
irst Ownership Fail Smart 4XJGU&YDMVTJWJUZ&OGPSDFNFOU 'FCUI BU4XJGUѪ޷ձWPM

.PCJMF&OHJOFFS 3BLVUFO JOD "CPVU.F :VLJ,VSPEB !EBSRVSP !EBSRVSP

4XJGU&YDMVTJWJUZ&OGPSDFNFOU IUUQTTXJGUPSHCMPHTXJGUFYDMVTJWJUZ

#BDLHSPVOE

#BDLHSPVOE 4XJGUͰ͸ϝϞϦ҆શੑΛ୲อ͢ΔͨΊʹɺ ഉଞతΞΫηε͕ඞཁ

#BDLHSPVOE func modifyTwice(_ value: inout Int, by modifier:
(inout Int) -> ()) { modifier(&value) modifier(&value) } func testCount() { var count = 1 modifyTwice(&count) { $0 += count } print(count) }

#BDLHSPVOE func modifyTwice(_ value: inout Int, by modifier:
(inout Int) -> ()) { modifier(&value) modifier(&value) } func testCount() { var count = 1 modifyTwice(&count) { $0 += count } print(count) } 0WFSMBQQJOHBDDFTTFTUPDPVOU CVUNPEJpDBUJPOSFRVJSFTFYDMVTJWF BDDFTTDPOTJEFSDPQZJOHUPBMPDBMWBSJBCMF

#BDLHSPVOE w ಉ࣌ΞΫηεʹରͯ͠ίϯύΠϥ͸ಈ࡞Λอূ͠ͳ͍ w ίϯύΠϥͷΦϓςΟϚΠθʔγϣϯʹΑΓɺ༧ଌͰ ͖ͳ͍ಈ࡞ʹͳΔ͜ͱ͕͋Δɻ w 4XGJU͸ͰഉଞతΞΫηεͷڧ੍Λಋೖͨ͠ɻ
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#BDLHSPVOE ίϯύΠϥͷഉଞతΞΫηεͷڧ੍ w ίϯύΠϧ࣌νΣοΫ $PNQJMFUJNF w ࣮ߦ࣌νΣοΫ
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#BDLHSPVOE 4XJGU 4XJGU $PNQJMFUJNF %FCVH#VJME 3FMFBTF#VJME %FCVH#VJME 3FMFBTF#VJME
3VOUJNF %FCVH#VJME %FCVH#VJME 3FMFBTF#VJME ഉଞతϝϞϦΞΫηεͷEFGBVMUઃఆ

*NQBDUPO4XJGU1SPKFDUT

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*NQBDUPO4XJGU1SPKFDUT 9DPEFͰ͸l&YDMVTJWF"DDFTTUP.FNPSZzͰมߋͰ͖Δ͕ɺ ύϑΥʔϚϯε༏ઌͷͨΊͷϦϦʔεϏϧυͰແޮʹ͢Δ͜ͱ͸ ਪ঑͠ͳ͍ɻ Ϋϥογϡ΍ϝϞϦഁյͳͲ༧ظ͠ͳ͍ڍಈΛট͘Մೳੑ

&YBNQMFT

&YBNQMF func modifyTwice(_ value: inout Int, by modifier:
(inout Int) -> ()) { modifier(&value) modifier(&value) } func testCount() { var count = 1 let incrementBy = count modifyTwice(&count) { $0 += incrementBy } print(count) }

&YBNQMF func modifyTwice(_ value: inout Int, by modifier:
(inout Int) -> ()) { modifier(&value) modifier(&value) } var count = 1 modifyTwice(&count) { $0 += count } print(count) 4JNVMUBOFPVTBDDFTTUPY CVUNPEJpDBUJPOSFRVJSFTFYDMVTJWFBDDFTT

.PUJWBUJPO

.PUJWBUJPO ϓϩάϥϜͷن໛͕େ͖͘ͳΔʹͭΕɺͲ͜ͰͲ͏஋ ͕มߋ͞ΕΔͷ͔ঢ়ଶ͕༧ଌͰ͖ͳ͍ ݴޠ࢓༷ͱͯ͠༧ଌෆೳͳৼΔ෣͍Λഉআ "#*҆ఆੑʹෆՄܽ
ύϑΥʔϚϯεͷ࠷దԽ 0XOFSTIJQͱNPWFPOMZUZQFTʹඞཁ

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4XJGU&YDMVTJWJUZ&OGPSDFNFOU w 4XJGUͰ͸ഉଞతϝϞϦΞΫηεͷ࣮ߦ࣌νΣοΫ͕ ϦϦʔεϏϧυͰσϑΥϧτ༗ޮͱͳΔ w 4XJGUͷ҆શੑɺݎ࿚ੑ͕ڧԽ w ύϑΥʔϚϯεʹର͢ΔΦϓςΟϚΠθʔγϣϯͷ޲্

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Swift 5 Exclusivity Enforcement

Swift 5 Exclusivity Enforcement

darquro

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Re:valua t ion https://fril.jp/ L ead & Delight User F

.PCJMF&OHJOFFS 3BLVUFO JOD "CPVU.F :VLJ,VSPEB !EBSRVSP !EBSRVSP

4XJGU&YDMVTJWJUZ&OGPSDFNFOU IUUQTTXJGUPSHCMPHTXJGUFYDMVTJWJUZ

#BDLHSPVOE

#BDLHSPVOE 4XJGUͰ͸ϝϞϦ҆શੑΛ୲อ͢ΔͨΊʹɺ ഉଞతΞΫηε͕ඞཁ

#BDLHSPVOE func modifyTwice(_ value: inout Int, by modifier:

#BDLHSPVOE func modifyTwice(_ value: inout Int, by modifier:

#BDLHSPVOE w ಉ࣌ΞΫηεʹରͯ͠ίϯύΠϥ͸ಈ࡞Λอূ͠ͳ͍ w ίϯύΠϥͷΦϓςΟϚΠθʔγϣϯʹΑΓɺ༧ଌͰ ͖ͳ͍ಈ࡞ʹͳΔ͜ͱ͕͋Δɻ w 4XGJU͸ͰഉଞతΞΫηεͷڧ੍Λಋೖͨ͠ɻ

#BDLHSPVOE ίϯύΠϥͷഉଞతΞΫηεͷڧ੍ w ίϯύΠϧ࣌νΣοΫ $PNQJMFUJNF w ࣮ߦ࣌νΣοΫ

#BDLHSPVOE 4XJGU 4XJGU $PNQJMFUJNF %FCVH#VJME 3FMFBTF#VJME %FCVH#VJME 3FMFBTF#VJME

*NQBDUPO4XJGU1SPKFDUT

*NQBDUPO4XJGU1SPKFDUT طଘϓϩδΣΫτ΁ͷӨڹ w ഉଞϧʔϧʹҧ൓͍ͯͯ͠ɺσόοάςετͰ࣮ߦͰ ͖ͳ͔ͬͨίʔυʹରͯ͠Ϋϥογϡ͢ΔՄೳੑ w ύϑΥʔϚϯεʹӨڹ͕ͰΔՄೳੑ͕͋Δɻ w

*NQBDUPO4XJGU1SPKFDUT 9DPEFͰ͸l&YDMVTJWF"DDFTTUP.FNPSZzͰมߋͰ͖Δ͕ɺ ύϑΥʔϚϯε༏ઌͷͨΊͷϦϦʔεϏϧυͰແޮʹ͢Δ͜ͱ͸ ਪ঑͠ͳ͍ɻ Ϋϥογϡ΍ϝϞϦഁյͳͲ༧ظ͠ͳ͍ڍಈΛট͘Մೳੑ

&YBNQMFT

&YBNQMF func modifyTwice(_ value: inout Int, by modifier:

&YBNQMF func modifyTwice(_ value: inout Int, by modifier:

.PUJWBUJPO

.PUJWBUJPO ϓϩάϥϜͷن໛͕େ͖͘ͳΔʹͭΕɺͲ͜ͰͲ͏஋ ͕มߋ͞ΕΔͷ͔ঢ়ଶ͕༧ଌͰ͖ͳ͍ ݴޠ࢓༷ͱͯ͠༧ଌෆೳͳৼΔ෣͍Λഉআ "#*҆ఆੑʹෆՄܽ

·ͱΊ

4XJGU&YDMVTJWJUZ&OGPSDFNFOU w 4XJGUͰ͸ഉଞతϝϞϦΞΫηεͷ࣮ߦ࣌νΣοΫ͕ ϦϦʔεϏϧυͰσϑΥϧτ༗ޮͱͳΔ w 4XJGUͷ҆શੑɺݎ࿚ੑ͕ڧԽ w ύϑΥʔϚϯεʹର͢ΔΦϓςΟϚΠθʔγϣϯͷ޲্

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