2026 EuroLLVM - CppInterOp: Interactive C++ as a Service and Advanced Language Interoperability

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2026 EuroLLVM Developers' Meeting

https://llvm.org/devmtg/2026-04/

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Title: CppInterOp: Interactive C++ as a Service and Advanced Language Interoperability

Speaker: Aaron Jomy

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Slides: https://llvm.org/devmtg/2026-04/slides/technical_talk/technical_talk_jomy.pdf

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CppInterOp provides compiler-as-a-service capabilities using Clang-REPL, enabling dynamic languages to interoperate with C++. This talk covers its technical architecture, including runtime template instantiation, C++ overload resolution, and JitCall - a lightweight runtime wrapper generator. We demonstrate how CppInterOp's API, built on Clang's AST, enables practical Python-C++ interoperability, including use cases like invoking CUDA kernels from Python and cross-language inheritance between Python and C++ classes.

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