Enum EulerError 

pub enum EulerError {
    EmptyGraph,
    Disconnected,
    NoCircuit,
    NoPath,
}

Errors returned by Euler path/circuit algorithms.

Variants

EmptyGraph

The graph has no nodes.

Disconnected

The graph is disconnected (ignoring isolated nodes), so no Euler path or circuit can traverse all edges.

NoCircuit

The degree conditions for an Euler circuit are not met.

For undirected graphs: all nodes must have even degree. For directed graphs: every node must have equal in-degree and out-degree.

NoPath

The degree conditions for an Euler path are not met.

For undirected graphs: exactly two nodes must have odd degree. For directed graphs: exactly one node must have out - in = 1 (start) and one must have in - out = 1 (end).

Trait Implementations

impl Clone for EulerError

fn clone(&self) -> EulerError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EulerError

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

Formats the value using the given formatter.

impl Display for EulerError

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

Formats the value using the given formatter.

impl Error for EulerError

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 EulerError

fn eq(&self, other: &EulerError) -> 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 StructuralPartialEq for EulerError