Struct FilterId

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

Available on crate features registry and std only.

Uniquely identifies an individual Filter instance in the context of a Subscriber.

When adding a Filtered Layer to a Subscriber, the Subscriber generates a FilterId for that Filtered layer. The Filtered layer will then use the generated ID to query whether a particular span was previously enabled by that layer’s Filter.

Note: Currently, the Registry type provided by this crate is the only Subscriber implementation capable of participating in per-layer filtering. Therefore, the FilterId type cannot currently be constructed by code outside of tracing-subscriber. In the future, new APIs will be added to tracing-subscriber to allow non-Registry Subscribers to also participate in per-layer filtering. When those APIs are added, subscribers will be responsible for generating and assigning FilterIds.

Trait Implementations

impl Binary for FilterId

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

Formats the value using the given formatter.

impl Clone for FilterId

fn clone(&self) -> FilterId

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FilterId

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

Formats the value using the given formatter.

impl Copy for FilterId