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Descrizione
It looks like #[cfg(not(feature))] is ignored by #[cxx::bridge], so the marked field would always exist:
mod ffi {
#[repr(u32)]
enum Variant {
#[cfg(not(feature = "v2"))]
A,
B,
}
}
See this demo repo for a reproducible example.
#[cfg(not(feature))] is useful when a newer version of a C++ library dropped something, while we would like to support both new and old versions with Cargo feature flags.