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Swift 5.9 と C++ の互換性
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h.crane
March 06, 2024
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Swift 5.9 と C++ の互換性
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集まれSwift好き!Swift愛好会 vol.80
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https://qiita.com/hcrane/items/081dd77bd593f1ea74af
h.crane
March 06, 2024
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Transcript
March 7, 2024, ू·ΕSwift͖ʂSwiftѪձ vol.80 Hiromu Tsuruta @ Rakuten Group,
Inc. Swift 5.9 ͱ C++ ͷޓੑ
<Company> ・Rakuten Group, Inc <Application> ・Rakuma
<Role> ・iOS Developer ・Developer Relations <Account> ・Twitter:@hcrane14 Tech Lead
ࠓ·Ͱͷ Swift ͱ C++ ͷޓੑ
ᶃ Objective-C++ ͰϒϦοδ͢Δ ᶄ C ͰϒϦοδ͢ΔʢC++ ͷػೳ extern "C" Λ͏ʣ
ᶅ SPM ͔Β module.modulemap Ͱެ։͢Δ
ํ๏ ᶃ Objective-C++ ͰϒϦοδ͢Δ
Swift Objective-C++ C++
Live on iOSDC2023 Ҿ༻ɿhttps://photos.google.com/share/AF1QipNFYcoT0g9XcxuTm8rsNZp7i4JrBKj10iTzj4abxZfTfwTIEzHPF0OSow6P4ClskA?pli=1&key=VmVfLTU1aWExX1BRX21KMDJhajZqRktmZngzWmt3
iOSDCͷొஃ༰ ͜ͷํ๏Ͱͨ͠
Ҿ༻ɿhttps://speakerdeck.com/hcrane/live-on-iosdc2023?slide=47
Ҿ༻ɿhttps://speakerdeck.com/hcrane/live-on-iosdc2023?slide=48
؆୯ͳ࣮αϯϓϧ
C++ ͷ࣮ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιουΛ࣋ͬͨΫϥε
Objective-C++ ͷ࣮ϑΝΠϧͱϔομʔϑΝΠϧ C++ͷίʔυΛݺͼग़͢ ϥούʔΫϥε
ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ Objective-C++ ͷϔομʔΛՃ͢Δ
Swift ͷ࣮ߦϑΝΠϧ Swift ͔Β Objective-C++ Λݺͼग़ͤΔʂ → ݁Ռͱͯ͠ C++ Λݺͼग़ͤΔ
ํ๏ ᶄ C ͰϒϦοδ͢Δ ʢC++ ͷػೳ extern "C" Λ͏ʣ
Swift C C++
؆୯ͳ࣮αϯϓϧ
Step.1 Swift ͔Β C Λݺͼग़͢؆୯ͳྫ
Swift C ͱޓੑ͕͋Δ
C ͷ࣮ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιου
ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C ͷϔομʔΛՃ͢Δ
Swift ͔Β C Λݺͼग़ͤΔʂ ʢޓੑ͕͋ΔͷͰϔομʔΛՃ͢Δ͚ͩͰ؆୯ʂʣ Swift ͷ࣮ߦϑΝΠϧ
Step. 2 Swift ͔Β C ܦ༝Ͱ C++ Λݺͼग़͢؆୯ͳྫ
C++ ͷػೳ extern "C" Λ͏
extern "C" ʹؔͯ͠ • C++ ͷݴޠػೳ • C++ Λ Cݴޠͱͯ͠ѻ͏Α͏͢Δ
• C++ ͱ CݴޠͷίϯύΠϥͰޓੑ͕ͳ͍࣌ʹ extern "C" Ͱճආ͢Δ → Swift Ͱ͑ C++ Λݺͼग़͢ͷʹ͑Δ
C++ ͷ࣮ϑΝΠϧͱϔομʔϑΝΠϧ extern "C" ͰғͬͨจࣈྻΛग़ྗ ͢Δ͚ͩͷ؆୯ͳϝιου
ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C++ ͷϔομʔΛՃ͢Δ ʢ#include ͳ͜ͱʹҙʣ
Swift ͔Β C ܦ༝Ͱ C++ Λݺͼग़ͤΔʂ Swift ͷ࣮ߦϑΝΠϧ
͜ͷํ๏ͷ੍ • C++ͷؔΛCݴޠͱͯ͠એݴ͢Δ߹ɺܕCݴޠ͕αϙʔτ͢Δܕ Ͱͳ͚ΕͳΒͳ͍ɻ(C++ ͷಛఆͷܕɾࢀরɾΫϥε NGʣ • C++ͷ໊લम০͕ແޮԽ͞ΕΔɻʢΦʔόʔϩʔυ͞Εͨؔ NGʣ etc.
ํ๏ ᶅ SPM ͔Β module.modulemap Ͱެ։͢Δ
Swift Swift Package Manager C++ module.modulemap
module.modulemap ʹؔͯ͠ • Bridging Header ͷ্Ґޓ • Objective-C / C
ͷγϯϘϧʢؔɺมɺܕɺఆʣʹΞΫηεͰ͖Δ etc.
Swift ͔Β SPM ܦ༝Ͱ؆୯ʹ C++ Λݺͼग़ͤΔʂ module.modulemap ϑΝΠϧ
ઌʹհͨ͠ํ๏ ᶃ, ᶄ Ͱ SPM ͔Β͏͜ͱ͕Ͱ͖Δ
͜Ε͔Βͷ Swift ͱ C++ ͷޓੑ
C++ interoperability
؆୯ͳ࣮αϯϓϧ
C++ ͷ࣮ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιουΛ࣋ͬͨΫϥε
ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C++ ͷϔομʔΛՃ͢Δ ʢ#include ͳ͜ͱʹҙʣ
interoperability ͷઃఆΛ C/Objective-C → C++/Objective-C++ ϓϩδΣΫτͷઃఆ
Swift ͔Β C++ Λݺͼग़ͤΔʂ Swift ͷ࣮ߦϑΝΠϧ
Objective-C / C ͱಉ͡ཁྖͰ C++ Λݺͼग़ͤΔʂ
ҙ ઃఆ͕มΘΔͷͰ C ݴޠϏϧυͰ͖ͳ͘ͳΔ ʢͨͩ͠ɺObjective-C ϏϧυͰ͖Δʣ → C ͱ C++
ͷίʔυΛࠞࡏͰ͖ͳ͘ͳΔ
Swift ͱ C++ Λߟͨ͠هࣄ Ҿ༻ɿhttps://kateinoigakukun.hatenablog.com/entry/2020/12/01/083949