Struct OpaqueErrorSource 

pub struct OpaqueErrorSource(/* private fields */);

Opaque handle to an underlying error, preserving its source chain without exposing the concrete type.

The opacity contract: the pointee is reachable only through std::error::Error::source() (returned directly — no Arc wrapper hop), the inner handle is private, there is no public Clone, and provenance cannot be extracted outside camel-api (short of unsafe). Crate internals duplicate the handle via OpaqueErrorSource::clone_handle when cloning a CamelError.

Examples

The inner handle cannot be destructured out of the wrapper (private field):

use camel_api::OpaqueErrorSource;

#[derive(Debug)]
struct MyError;

impl std::fmt::Display for MyError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str("my error")
    }
}

impl std::error::Error for MyError {}

let OpaqueErrorSource(inner) = OpaqueErrorSource::new(std::sync::Arc::new(MyError));

The wrapper is deliberately not Clone, so callers cannot copy the handle out of camel-api:

use camel_api::OpaqueErrorSource;

#[derive(Debug)]
struct MyError;

impl std::fmt::Display for MyError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str("my error")
    }
}

impl std::error::Error for MyError {}

let s = OpaqueErrorSource::new(std::sync::Arc::new(MyError));
let _ = s.clone();

Implementations

impl OpaqueErrorSource

pub fn new(source: Arc<dyn Error + Send + Sync>) -> Self

Wrap an existing error as an opaque source.

Trait Implementations

impl Debug for OpaqueErrorSource

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for OpaqueErrorSource

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for OpaqueErrorSource

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.