Shared Types

#[cxx::bridge]
mod ffi {
    #[derive(Clone, Debug, Hash)]
    struct PlayingCard {
        suit: Suit,
        value: u8,  // A=1, J=11, Q=12, K=13
    }
    enum Suit {
        Clubs,
        Diamonds,
        Hearts,
        Spades,
    }
}

• Only C-like (unit) enums are supported.
• A limited number of traits are supported for #[derive()] on shared types. Corresponding functionality is also generated for the C++ code, e.g. if you derive Hash also generates an implementation of std::hash for the corresponding C++ type.