dtolnay/cxx

Extern "Rust" types that are nonlocal

Ouverte

#496 ouverte le 22 nov. 2020

 (5 commentaires) (0 réaction) (0 personne assignée)Rust (253 forks)batch import
help wanted

Métriques du dépôt

Stars
 (4 472 étoiles)
Métriques de merge PR
 (Merge moyen 8m) (3 PRs mergées en 30 j)

Description

The following worked prior to 1.0:

type DataSourcePrivate = Rc<DataSource>;

#[cxx::bridge(namespace = "mcrtlib::ffi")]
mod types {
    pub struct DataSource {
        pub inner: Box<DataSourcePrivate>,
    }

    extern "Rust" {
        type DataSourcePrivate;

        // ...
    }
}

However, now I just get a

error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
  --> library/src/ffi.rs:85:9
   |
85 |         type DataSourcePrivate;
   |         ^^^^^-----------------
   |         |    |
   |         |    `Rc` is not defined in the current crate
   |         impl doesn't use only types from inside the current crate
   |
   = note: define and implement a trait or new type instead

Is it possible to make this work again or should I wrap my Rc in a tuple struct?

Guide contributeur