Enum InitError 

pub enum InitError<E> {
    InitFunctionFailed(E),
    ConcurrentInitialization,
}

The cell could not be initialized.

Returned by OnceCell::get_or_try_init, which fails either because the init function itself failed, or because another caller is already initializing the cell.

Variants

InitFunctionFailed(E)

The init function returned an error.

The cell is left uninitialized, so the operation can be retried.

ConcurrentInitialization

There is another init function running concurrently for the same OnceCell.

The init function of this call was not executed. It is dropped together with everything that it captured, so it cannot be reused for a retry. See OnceCell::get_or_try_init for how to keep ownership of captured resources, and ConcurrentInitialization for details on the error itself.

Implementations

impl<E> InitError<E>

pub fn init_function_error(self) -> Option<E>

Returns the error of the init function, or None for a ConcurrentInitialization error.

Trait Implementations

impl<E: Clone> Clone for InitError<E>

fn clone(&self) -> InitError<E>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<E: Copy> Copy for InitError<E>

impl<E: Debug> Debug for InitError<E>

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

Formats the value using the given formatter.

impl<E: Display> Display for InitError<E>

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

Formats the value using the given formatter.

impl<E: Eq> Eq for InitError<E>

impl<E: Error + 'static> Error for InitError<E>

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.

impl<E> From<ConcurrentInitialization> for InitError<E>

fn from(_: ConcurrentInitialization) -> Self

Converts to this type from the input type.

impl<E: PartialEq> PartialEq for InitError<E>

fn eq(&self, other: &InitError<E>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<E: PartialEq> StructuralPartialEq for InitError<E>