Enum DagError

pub enum DagError {
    VertexNotFound(VertexName),
    IdNotFound(Id),
    NeedSlowPath(String),
    Programming(String),
    Bug(String),
    Backend(Box<BackendError>),
    IdOverflow(Group),
}

Error used by the Dag crate.

Variants

VertexNotFound(VertexName)

A vertex name cannot be found.

IdNotFound(Id)

An Id cannot be found.

NeedSlowPath(String)

A fast path cannot be used.

Programming(String)

Callsite does something wrong. For example, a “parent function” does not return reproducible results for a same vertex if called twice.

Bug(String)

Logic error in this crate. A bug in this crate or the backend data.

Backend(Box<BackendError>)

The backend (ex. filesystem) cannot fulfill the request somehow.

IdOverflow(Group)

No space for new Ids.

Trait Implementations

impl Debug for DagError

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

Formats the value using the given formatter.

impl Display for DagError

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

Formats the value using the given formatter.

impl Error for DagError

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<BackendError> for DagError

fn from(err: BackendError) -> DagError

Converts to this type from the input type.

impl From<Error> for DagError

fn from(err: Error) -> DagError

Converts to this type from the input type.

impl From<Error> for DagError

fn from(err: Error) -> DagError

Converts to this type from the input type.