Enum GraphError 

pub enum GraphError {
    PadOutOfRange {
        index: usize,
        pad_count: usize,
    },
    PadAlreadyLinked(String),
    ParentNotAttached(ElementId),
    NodeAlreadyAttached(ElementId),
    BranchNotAttached(BranchId),
    EmptyBranch,
    NotSingleOutput {
        name: Arc<str>,
        count: usize,
    },
}

A rejected topology change.

Every variant here is a refusal, not a partial result: attachment validates before it mutates, so a graph that returns one of these is left exactly as it was.

Variants

PadOutOfRange

The requested source pad index does not exist.

Fields

index: usize

Requested zero-based source pad index.

pad_count: usize

Number of source pads available on the element.

PadAlreadyLinked(String)

Attachment targeted a source pad that already owns a downstream sink.

ParentNotAttached(ElementId)

A dynamic attachment named an element that is no longer in this graph.

NodeAlreadyAttached(ElementId)

An attachment plan attempted to publish an already-attached node.

BranchNotAttached(BranchId)

A detach operation named a branch that is no longer attached.

EmptyBranch

An attachment plan contained no terminal or processing element.

NotSingleOutput

crate::pipeline::ChainBuilder::pipe received a filter whose output shape cannot be represented as one linear chain stage.

Fields

name: Arc<str>

Caller-selected name of the rejected filter.

count: usize

Number of source pads exposed by the rejected filter.

Trait Implementations

impl Debug for GraphError

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

Formats the value using the given formatter.

impl Display for GraphError

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

Formats the value using the given formatter.

impl Eq for GraphError

impl Error for GraphError

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<GraphError> for Error

fn from(source: GraphError) -> Self

Converts to this type from the input type.

impl PartialEq for GraphError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for GraphError