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

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes