Enum HierarchyError 

pub enum HierarchyError {
    OrphanPrevention {
        child: TaskId,
        parent: TaskId,
    },
    DepthLimitExceeded {
        child: TaskId,
        parent: TaskId,
        depth: usize,
        limit: usize,
    },
}

Error returned when registering a parent-child relationship fails.

Variants

OrphanPrevention

Parent task has already reached a terminal state; no new children allowed.

Fields

child: TaskId

The child task that was rejected.

parent: TaskId

The terminal parent task.

DepthLimitExceeded

Adding this child would exceed the configured maximum nesting depth.

Fields

child: TaskId

The child task that was rejected.

parent: TaskId

The parent task that would have hosted the child.

depth: usize

The depth the child would have reached.

limit: usize

The configured maximum allowed depth.

Trait Implementations

impl Clone for HierarchyError

fn clone(&self) -> HierarchyError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HierarchyError

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

Formats the value using the given formatter.

impl Display for HierarchyError

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

Formats the value using the given formatter.

impl Error for HierarchyError

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 PartialEq for HierarchyError

fn eq(&self, other: &HierarchyError) -> 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 Eq for HierarchyError

impl StructuralPartialEq for HierarchyError