Swift 5.9 と C++ の互換性

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March 7, 2024, ू·ΕSwift޷͖ʂSwiftѪ޷ձ vol.80 Hiromu Tsuruta @ Rakuten Group, Inc. Swift 5.9 ͱ C++ ͷޓ׵ੑ

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　　　　　　　　　　　　　　　　　　　　　　　　　　　　・Rakuten Group, Inc 　　　　　　　　　　　　　　　　・Rakuma 　　　　　　・iOS Developer 　　　・Developer Relations 　　　　　　　　　　　　　　　　　　　　　　　　　　　・Twitter：@hcrane14 Tech Lead

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ࠓ·Ͱͷ Swift ͱ C++ ͷޓ׵ੑ

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ᶃ Objective-C++ ͰϒϦοδ͢Δ ᶄ C ͰϒϦοδ͢ΔʢC++ ͷػೳ extern "C" Λ࢖͏ʣ ᶅ SPM ͔Β module.modulemap Ͱެ։͢Δ

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ํ๏ ᶃ Objective-C++ ͰϒϦοδ͢Δ

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Swift Objective-C++ C++

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Live on iOSDC2023 Ҿ༻ɿhttps://photos.google.com/share/AF1QipNFYcoT0g9XcxuTm8rsNZp7i4JrBKj10iTzj4abxZfTfwTIEzHPF0OSow6P4ClskA?pli=1&key=VmVfLTU1aWExX1BRX21KMDJhajZqRktmZngzWmt3

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iOSDCͷొஃ಺༰͸ ͜ͷํ๏Ͱͨ͠

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Ҿ༻ɿhttps://speakerdeck.com/hcrane/live-on-iosdc2023?slide=47

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Ҿ༻ɿhttps://speakerdeck.com/hcrane/live-on-iosdc2023?slide=48

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؆୯ͳ࣮૷αϯϓϧ

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C++ ͷ࣮૷ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιουΛ࣋ͬͨΫϥε

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Objective-C++ ͷ࣮૷ϑΝΠϧͱϔομʔϑΝΠϧ C++ͷίʔυΛݺͼग़͢ ϥούʔΫϥε

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ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ Objective-C++ ͷϔομʔΛ௥Ճ͢Δ

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Swift ͷ࣮ߦϑΝΠϧ Swift ͔Β Objective-C++ Λݺͼग़ͤΔʂ → ݁Ռͱͯ͠ C++ Λݺͼग़ͤΔ

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ํ๏ ᶄ C ͰϒϦοδ͢Δ ʢC++ ͷػೳ extern "C" Λ࢖͏ʣ

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Swift C C++

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؆୯ͳ࣮૷αϯϓϧ

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Step.1 Swift ͔Β C Λݺͼग़͢؆୯ͳྫ

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Swift ͸ C ͱޓ׵ੑ͕͋Δ

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C ͷ࣮૷ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιου

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ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C ͷϔομʔΛ௥Ճ͢Δ

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Swift ͔Β C Λݺͼग़ͤΔʂ ʢޓ׵ੑ͕͋ΔͷͰϔομʔΛ௥Ճ͢Δ͚ͩͰ؆୯ʂʣ Swift ͷ࣮ߦϑΝΠϧ

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Step. 2 Swift ͔Β C ܦ༝Ͱ C++ Λݺͼग़͢؆୯ͳྫ

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C++ ͷػೳ extern "C" Λ࢖͏

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extern "C" ʹؔͯ͠ • C++ ͷݴޠػೳ • C++ Λ Cݴޠͱͯ͠ѻ͏Α͏͢Δ • C++ ͱ CݴޠͷίϯύΠϥͰޓ׵ੑ͕ͳ͍࣌ʹ extern "C" Ͱճආ͢Δ → Swift Ͱ࢖͑͹ C++ Λݺͼग़͢ͷʹ࢖͑Δ

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C++ ͷ࣮૷ϑΝΠϧͱϔομʔϑΝΠϧ extern "C" ͰғͬͨจࣈྻΛग़ྗ ͢Δ͚ͩͷ؆୯ͳϝιου

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ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C++ ͷϔομʔΛ௥Ճ͢Δ ʢ#include ͳ͜ͱʹ஫ҙʣ

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Swift ͔Β C ܦ༝Ͱ C++ Λݺͼग़ͤΔʂ Swift ͷ࣮ߦϑΝΠϧ

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͜ͷํ๏ͷ੍໿ • C++ͷؔ਺ΛCݴޠͱͯ͠એݴ͢Δ৔߹ɺܕ͸Cݴޠ͕αϙʔτ͢Δܕ Ͱͳ͚Ε͹ͳΒͳ͍ɻ(C++ ͷಛఆͷܕɾࢀরɾΫϥε͸ NGʣ • C++ͷ໊લम০͕ແޮԽ͞ΕΔɻʢΦʔόʔϩʔυ͞Εͨؔ਺͸ NGʣ etc.

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ํ๏ ᶅ SPM ͔Β module.modulemap Ͱެ։͢Δ

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Swift Swift Package Manager C++ module.modulemap

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module.modulemap ʹؔͯ͠ • Bridging Header ͷ্Ґޓ׵ • Objective-C / C ͷγϯϘϧʢؔ਺ɺม਺ɺܕɺఆ਺ʣʹΞΫηεͰ͖Δ etc.

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Swift ͔Β SPM ܦ༝Ͱ؆୯ʹ C++ Λݺͼग़ͤΔʂ module.modulemap ϑΝΠϧ

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ઌʹ঺հͨ͠ํ๏ ᶃ, ᶄ Ͱ΋ SPM ͔Β࢖͏͜ͱ͕Ͱ͖Δ

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͜Ε͔Βͷ Swift ͱ C++ ͷޓ׵ੑ

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C++ interoperability

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؆୯ͳ࣮૷αϯϓϧ

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C++ ͷ࣮૷ϑΝΠϧͱϔομʔϑΝΠϧ จࣈྻΛग़ྗ͢Δ͚ͩͷ؆୯ͳϝιουΛ࣋ͬͨΫϥε

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ϓϩδΣΫτͷϔομʔϑΝΠϧ ϓϩδΣΫτͷϔομʔʹ C++ ͷϔομʔΛ௥Ճ͢Δ ʢ#include ͳ͜ͱʹ஫ҙʣ

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interoperability ͷઃఆΛ C/Objective-C → C++/Objective-C++ ϓϩδΣΫτͷઃఆ

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Swift ͔Β C++ Λݺͼग़ͤΔʂ Swift ͷ࣮ߦϑΝΠϧ

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Objective-C / C ͱಉ͡ཁྖͰ C++ Λݺͼग़ͤΔʂ

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஫ҙ఺ ઃఆ͕มΘΔͷͰ C ݴޠ͸ϏϧυͰ͖ͳ͘ͳΔ ʢͨͩ͠ɺObjective-C ͸ϏϧυͰ͖Δʣ → C ͱ C++ ͷίʔυΛࠞࡏͰ͖ͳ͘ͳΔ

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Swift ͱ C++ Λߟ࡯ͨ͠هࣄ Ҿ༻ɿhttps://kateinoigakukun.hatenablog.com/entry/2020/12/01/083949