Enum AdjunctionError 

#[non_exhaustive]
pub enum AdjunctionError {
    NonInjectiveVertexMap {
        first: Name,
        second: Name,
        target: Name,
    },
    NonInjectiveEdgeMap {
        src: Name,
        tgt: Name,
    },
    AnchorOutsideImage(Name),
    Sigma(RestrictError),
}

Error raised when an adjunction transport is undefined for the given migration or instance.

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.

NonInjectiveVertexMap

The vertex map merges two source vertices, so the W-type Delta_F (which would duplicate a node into several anchors and leave the tree category) is undefined. Use the functor-side adjunction for merging maps.

Fields

first: Name

First source vertex sharing the image.

second: Name

Second source vertex sharing the image.

target: Name

The shared target vertex.

NonInjectiveEdgeMap

The edge map merges two source edges, so the W-type pullback cannot invert the edge relabelling unambiguously.

Fields

src: Name

Source anchor of the shared target edge.

tgt: Name

Target anchor of the shared target edge.

AnchorOutsideImage(Name)

A node’s anchor lies outside the image of F, so the pullback has no source vertex to reindex it to.

Sigma(RestrictError)

The underlying left Kan extension (wtype_extend) failed.

Trait Implementations

impl Debug for AdjunctionError

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

Formats the value using the given formatter.

impl Display for AdjunctionError

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

Formats the value using the given formatter.

impl Error for AdjunctionError

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 From<RestrictError> for AdjunctionError

fn from(source: RestrictError) -> Self

Converts to this type from the input type.