Method get

crates/wasi-common/src/table.rs:70–77

Get an Arc reference to a resource of a given type at a given index. Multiple immutable references can be borrowed at any given time.

(&self, key: u32)

    /// Get an Arc reference to a resource of a given type at a given index. Multiple
    /// immutable references can be borrowed at any given time.
    pub fn get<T: Any + Send + Sync + Sized>(&self, key: u32) -> Result<Arc<T>, Error> {
        if let Some(r) = self.0.read().unwrap().map.get(&key).cloned() {
            r.downcast::<T>()
                .map_err(|_| Error::badf().context("element is a different type"))
        } else {
            Err(Error::badf().context("key not in table"))
        }
    }

    /// Get a mutable reference to a resource of a given type at a given index.
    /// Only one such reference can be borrowed at any given time.