Enum LifecycleError 

#[non_exhaustive]
pub enum LifecycleError<M> {
    TransitionDenied {
        from: M,
        to: M,
        reason: &'static str,
    },
}

Errors that can occur during lifecycle operations.

All variants include enough context to diagnose the failure without a debugger. Uses #[non_exhaustive] so new variants can be added in minor versions without breaking downstream code.

Examples

use ready_active_safe::LifecycleError;

let err: LifecycleError<&str> = LifecycleError::TransitionDenied {
    from: "active",
    to: "ready",
    reason: "backward transitions are not allowed",
};
assert_eq!(
    err.to_string(),
    "transition denied from active to ready: backward transitions are not allowed",
);

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.

TransitionDenied

A mode transition was rejected by the Policy.

Fields

from: M

The mode the system was in when the transition was attempted.

to: M

The mode the system attempted to transition to.

reason: &'static str

A human-readable explanation of why the transition was denied.

Trait Implementations

impl<M: Clone> Clone for LifecycleError<M>

fn clone(&self) -> LifecycleError<M>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<M: Debug> Debug for LifecycleError<M>

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

Formats the value using the given formatter.

impl<M: Display> Display for LifecycleError<M>

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

Formats the value using the given formatter.

impl<M: Debug + Display> Error for LifecycleError<M>

Available on crate feature std only.

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<M: PartialEq> PartialEq for LifecycleError<M>

fn eq(&self, other: &LifecycleError<M>) -> 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<M: Eq> Eq for LifecycleError<M>

impl<M> StructuralPartialEq for LifecycleError<M>