Enum QualityHierarchyError 

#[non_exhaustive]
pub enum QualityHierarchyError {
    NodeOutOfRange,
    ParentOutOfRange,
    ChildOutOfRange,
    LevelOutOfRange,
    CostOutOfRange,
    NodeNotIsolated,
    SelfEdge,
    EdgeAlreadyExists,
    ChildAlreadyParented,
    LevelOrderViolation,
    CostOrderViolation,
}

A disabled quality-hierarchy transition.

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.

NodeOutOfRange

A node index is outside the admitted node set.

ParentOutOfRange

A proposed parent index is outside the admitted node set.

ChildOutOfRange

A proposed child index is outside the admitted node set.

LevelOutOfRange

A proposed level exceeds the hierarchy ceiling.

CostOutOfRange

A proposed cost exceeds the hierarchy ceiling.

NodeNotIsolated

Node-property updates require an isolated node.

SelfEdge

A node cannot be its own child.

EdgeAlreadyExists

The exact parent-child edge already exists.

ChildAlreadyParented

The proposed child already has a parent.

LevelOrderViolation

Parent level must strictly exceed child level.

CostOrderViolation

Parent cost must not exceed child cost.

Trait Implementations

impl Clone for QualityHierarchyError

fn clone(&self) -> QualityHierarchyError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for QualityHierarchyError

impl Debug for QualityHierarchyError

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

Formats the value using the given formatter.

impl Display for QualityHierarchyError

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

Formats the value using the given formatter.

impl Eq for QualityHierarchyError

impl Error for QualityHierarchyError

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 QualityHierarchyError

fn eq(&self, other: &QualityHierarchyError) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for QualityHierarchyError