Enum StateMachineBuildError 

pub enum StateMachineBuildError<S, E> {
    InitialStateNotRegistered {
        state: S,
    },
    FinalStateNotRegistered {
        state: S,
    },
    TransitionSourceNotRegistered {
        source: S,
        event: E,
        target: S,
    },
    TransitionTargetNotRegistered {
        source: S,
        event: E,
        target: S,
    },
    DuplicateTransition {
        source: S,
        event: E,
        existing_target: S,
        new_target: S,
    },
}

Error returned when state machine rules are internally inconsistent.

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

Variants

InitialStateNotRegistered

An initial state was configured but not registered as a state.

Fields

state: S

The unregistered initial state.

FinalStateNotRegistered

A final state was configured but not registered as a state.

Fields

state: S

The unregistered final state.

TransitionSourceNotRegistered

A transition source was not registered as a state.

Fields

source: S

Source state of the invalid transition.

event: E

Event of the invalid transition.

target: S

Target state of the invalid transition.

TransitionTargetNotRegistered

A transition target was not registered as a state.

Fields

source: S

Source state of the invalid transition.

event: E

Event of the invalid transition.

target: S

Target state of the invalid transition.

DuplicateTransition

Two transitions use the same (source, event) with different targets.

Fields

source: S

Source state shared by both transitions.

event: E

Event shared by both transitions.

existing_target: S

Target registered first.

new_target: S

Conflicting target registered later.

Trait Implementations

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

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

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

Formats the value using the given formatter.

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

where S: Debug, E: Debug,

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

Formats the validation error with the offending state or transition.

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

fn eq(&self, other: &StateMachineBuildError<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 StateMachineBuildError<S, E>

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

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