Enum TopologicalError 

pub enum TopologicalError {
    Cyclic {
        unordered: Vec<NodeId>,
    },
    Undirected,
}

Why a topological order could not be produced.

Variants

Cyclic

The graph contains a cycle, so no ordering exists.

The nodes reported are those left unordered — every one of them lies on, or downstream of, a cycle. That is what a caller needs in order to say which dependencies are circular.

Fields

unordered: Vec<NodeId>

The nodes that could not be placed.

Undirected

The graph is undirected, where a topological order is not defined.

Trait Implementations

impl Clone for TopologicalError

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 TopologicalError

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

Formats the value using the given formatter.

impl Display for TopologicalError

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

Formats the value using the given formatter.

impl Eq for TopologicalError

impl Error for TopologicalError

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 TopologicalError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TopologicalError