Enum CancelQueryError 

#[non_exhaustive]
pub enum CancelQueryError {
    QueryNotFound(QueryHandle),
}

Available on crate features alloc or no-atomic or std only.

Errors raised by query-handle lookups on Endpoint (poll_query_*, handle_query_timeout, cancel_query, …) when the handle no longer corresponds to an active query. A query disappears from the endpoint when its terminal update has been drained via Endpoint::poll_query (auto-prune) or after an explicit Endpoint::cancel_query call.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

QueryNotFound(QueryHandle)

The handle does not refer to a currently registered query.

Implementations

impl CancelQueryError

pub const fn is_query_not_found(&self) -> bool

Returns true if this value is of type QueryNotFound. Returns false otherwise

impl CancelQueryError

pub fn unwrap_query_not_found(self) -> QueryHandle

Unwraps this value to the CancelQueryError::QueryNotFound variant. Panics if this value is of any other type.

pub fn unwrap_query_not_found_ref(&self) -> &QueryHandle

Unwraps this reference to the CancelQueryError::QueryNotFound variant. Panics if this value is of any other type.

impl CancelQueryError

pub fn try_unwrap_query_not_found( self, ) -> Result<QueryHandle, TryUnwrapError<Self>>

Attempts to unwrap this value to the CancelQueryError::QueryNotFound variant. Returns a [TryUnwrapError] with the original value if this value is of any other type.

pub fn try_unwrap_query_not_found_ref( &self, ) -> Result<&QueryHandle, TryUnwrapError<&Self>>

Attempts to unwrap this reference to the CancelQueryError::QueryNotFound variant. Returns a [TryUnwrapError] with the original value if this value is of any other type.

Trait Implementations

impl Clone for CancelQueryError

fn clone(&self) -> CancelQueryError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CancelQueryError

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

Formats the value using the given formatter.

impl Display for CancelQueryError

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

Formats the value using the given formatter.

impl Error for CancelQueryError

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.