Enum StateMachineError 

pub enum StateMachineError<S, E> {
    UnknownState {
        state: S,
    },
    UnknownTransition {
        source: S,
        event: E,
    },
    CasConflict {
        attempts: u32,
    },
}

Error returned when an event cannot be applied to the current state.

S is the state type and E is the event type.

Variants

UnknownState

The current state is not registered in the state machine.

Fields

state: S

The unregistered current state.

UnknownTransition

There is no transition for the current state and event pair.

Fields

source: S

The current source state.

event: E

The event that was triggered.

CasConflict

CAS retry limits were exhausted before a transition could be installed.

Fields

attempts: u32

Number of attempts executed by the CAS executor.

Trait Implementations

impl<S: Clone, E: Clone> Clone for StateMachineError<S, E>

fn clone(&self) -> StateMachineError<S, E>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug, E: Debug> Debug for StateMachineError<S, E>

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

Formats the value using the given formatter.

impl<S, E> Display for StateMachineError<S, E>

where S: Debug, E: Debug,

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

Formats the transition failure with enough context for diagnostics.

impl<S, E> Error for StateMachineError<S, E>

where S: Debug, E: Debug,

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<S: PartialEq, E: PartialEq> PartialEq for StateMachineError<S, E>

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<S: Copy, E: Copy> Copy for StateMachineError<S, E>

impl<S: Eq, E: Eq> Eq for StateMachineError<S, E>

impl<S, E> StructuralPartialEq for StateMachineError<S, E>