Enum TopoError 

pub enum TopoError {
    CycleDetected {
        cycle: Vec<i64>,
        explanation: String,
    },
}

Error type for topological sort.

Topological sort is only valid on DAGs. When cycles exist, this error provides the cycle path and a helpful explanation.

Variants

CycleDetected

Graph contains a cycle, making topological sort impossible.

The cycle field contains the actual cycle path (nodes forming the cycle). The explanation field provides a human-readable description.

Fields

cycle: Vec<i64>

Nodes forming the cycle (in order).

explanation: String

Human-readable explanation of why sorting failed.

Trait Implementations

impl Clone for TopoError

fn clone(&self) -> TopoError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TopoError

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

Formats the value using the given formatter.

impl Display for TopoError

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

Formats the value using the given formatter.

impl Error for TopoError

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.