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Do not write the bindings manually. Just use the amazing uniffi-rs library from Mozilla.

You can generate bindings for multiple languages. It supports error handling on both sides and latest versions also support native async integration.

I've used it to reuse the same Rust engine in iOS and Android apps and write native UI.

The bindings are inefficient doing excessive cloning. But if performance is not a concern then its fine.

Couldn’t you manually edit after generating so you could thereby optimize the code as needed?

Thanks! Anywhere you hit issues?

Not really. But I didn't use async (was not supported yet when I started using it).

Bindings were easy, everything else (building, linking,...) was a bit pain to setup because there no good examples.