Enum GraphError 

#[non_exhaustive]
pub enum GraphError {
    ForeignReference {
        reference: NodeId,
    },
    NonPriorReference {
        node: NodeId,
        reference: NodeId,
    },
    InvalidReferenceType {
        reference: NodeId,
        expected: &'static str,
        actual: &'static str,
    },
    UnknownRoot {
        root: NodeId,
        node_count: usize,
    },
    ContradictoryMaster {
        detail: &'static str,
    },
}

Invalid graph construction.

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.

ForeignReference

A node handle belongs to a different graph builder.

Fields

reference: NodeId

NonPriorReference

A node referenced itself or a later/not-yet-inserted node.

Fields

node: NodeId

reference: NodeId

InvalidReferenceType

A reference resolves locally but points to the wrong node family.

Fields

reference: NodeId

Existing node whose family is invalid for this edge.

expected: &'static str

Human-readable family accepted by the edge.

actual: &'static str

Human-readable family of the referenced node.

UnknownRoot

A requested root does not exist.

Fields

root: NodeId

node_count: usize

ContradictoryMaster

A master representation names a side the relation does not have.

Fields

detail: &'static str

What the contradiction is, in the caller’s terms.

Trait Implementations

impl Clone for GraphError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GraphError

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

Formats the value using the given formatter.

impl Display for GraphError

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

Formats the value using the given formatter.

impl Eq for GraphError

impl Error for GraphError

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 GraphError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for GraphError