Struct SourceMetadataIndex 

pub struct SourceMetadataIndex(/* private fields */);

The metadata of every source of a run.

Only the engine constructs this, from the evidence session, and registers it for the duration of one run, replacing any host-registered copy, as it does crate::SourceDisciplines. A source’s schema comes from its snapshot unless the session states it. A source without an entry has no field read.

Implementations

impl SourceMetadataIndex

pub fn new( metadata: impl IntoIterator<Item = (SourceId, SourceMetadata)>, ) -> Self

Indexes metadata by source.

Capability tests construct it; a run always uses the runtime’s own.

pub fn of(&self, source: &SourceId) -> Option<&SourceMetadata>

Everything known about source, if anything.

pub fn values(&self, source: &SourceId, field: SourceField) -> Option<&[String]>

The values of field for source; None when never read.

Trait Implementations

impl Clone for SourceMetadataIndex

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 SourceMetadataIndex

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

Formats the value using the given formatter.

impl Default for SourceMetadataIndex

fn default() -> Self

Returns the “default value” for a type.