Wrapping enum for external rust crate

[JonathanPlasse]

Is it possible to wrap an enum from an external crate to apply pyclass on it?
Thank you.

[davidhewitt]

Sorry for the slow reply.

Rust proc-macros work off the syntax they are applied to, so unfortunately you can't just add #[pyclass] to "wrap" an external enum.

There are crates like deflect which enable reflection at runtime, which might eventually provide a way to make this work. However, those techniques are still experimental and only work on Linux, so I'm not rushing to try them out for PyO3 yet.

[JonathanPlasse]

Thanks for your response, so I just have to copy the enum and implement a conversion from the copied enum to the external enum.

[mejrs]

You need to make a newtype around the enum.

[JonathanPlasse]

I tried to make a newtype with

[pyclass]
struct EnumWrapper(Enum);

but the field of the enum is not present I only got an empty class.