Enum SchemaGap 

#[non_exhaustive]
pub enum SchemaGap {
    Schema(SchemaResolutionError),
    NotInSchema(NotInSchema),
}

Why a per-attribute accessor bound to the model’s declared release could not produce a value.

Reading an attribute that varies by release (e.g. IfcZone.LongName, absent in IFC2X3) needs the model’s release resolved first. Either step can fail: the model’s own FILE_SCHEMA may not resolve at all (SchemaResolutionError, see crate::schema_of), or it may resolve to a release that simply does not declare the attribute (NotInSchema). Both are reported through this one error so a caller has a single type to match on.

#[non_exhaustive]: new attribute-accessor call sites reuse this type, and adding one must not be a breaking change for existing matches.

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.

Schema(SchemaResolutionError)

The model’s declared schema could not be resolved.

NotInSchema(NotInSchema)

The resolved release does not declare this attribute for this entity.

Trait Implementations

impl Clone for SchemaGap

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 SchemaGap

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

Formats the value using the given formatter.

impl Display for SchemaGap

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

Formats the value using the given formatter.

impl Eq for SchemaGap

impl Error for SchemaGap

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<NotInSchema> for SchemaGap

fn from(error: NotInSchema) -> Self

Converts to this type from the input type.

impl From<SchemaResolutionError> for SchemaGap

fn from(error: SchemaResolutionError) -> Self

Converts to this type from the input type.

impl PartialEq for SchemaGap

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SchemaGap