It can be done in 100% safe code as far as Rust is concerned (if you use `dyn Fn... | Hacker News

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		pornel 1 day ago \| parent \| context \| favorite \| on: The Cost of a Closure in C It can be done in 100% safe code as far as Rust is concerned (if you use `dyn Fn` type instead of c_void). The only unsafe here is to demonstrate it works with C/C++ FFI (where void* userdata is actually not type safe)

nesarkvechnep 22 hours ago [–]

Yes but my problem wasn’t with the user data pointer but the fact that I needed a STATIC generic lambda. Static because the C library then forks and continues to call the lambda in the new process but I also type based conversions in it.

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