Struct BoxError 

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

A type-erased error value. Carries an error from any source in a public API without exposing the concrete type.

Construction:

• BoxError::new: wraps any E: Error + Send + Sync + 'static
• From<Box<dyn Error + Send + Sync>>: migrates from an already-boxed form

No From<E> for arbitrary E: Error: under Rust’s coherence rules, this would overlap with the blanket From<T> for T impl (since BoxError itself implements Error). Callers should use BoxError::new to wrap explicitly.

Implementations

impl BoxError

pub fn new<E>(err: E) -> Self

where E: StdError + Send + Sync + 'static,

Wraps any std::error::Error.

Trait Implementations

impl Debug for BoxError

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

Formats the value using the given formatter.

impl Display for BoxError

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

Formats the value using the given formatter.

impl Error for BoxError

fn source(&self) -> Option<&(dyn StdError + '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.

impl From<Box<dyn Error + Send + Sync>> for BoxError

fn from(value: Box<dyn StdError + Send + Sync>) -> Self

Converts to this type from the input type.