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I have used CXX in a project where I had to use a library available only in C++. There were Python bindings but somehow they were very slow. I could have rolled out my own pybind11 but wanted some of the Rust guarantees.

It was probably more convoluted than necessary since I also then exposed the Rust lib to Python, so C++ <=> Rust <=> Python , but it was indeed fun to implement it all.

https://github.com/dtolnay/cxx

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There's also a more blasphemy-ish approach of interop between C++ and Rust if the C++ code already have good Python bindings: C++ <=> Python <=> Rust. It's not bad as you may think. My company uses it to adapt C++ to Rust without rewriting the 40K LOC Pybind11 boilerplate. Going through the Python interpreter is definitely slower than a native call but perhaps <3x since we only rely on Python being a hosted + GC environment, plus it's much easier to express lifetime in Rust given that everything is managed on Python heap.

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