🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

For the release documentation, please see docs.rs, instead.

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pub struct NoCollector(_);
Expand description

A no-op collector.

NoCollector implements the Collect trait by never being enabled, never being interested in any callsite, and drops all spans and events.

Implementations

Returns a new NoCollector instance.

This function is equivalent to calling NoCollector::default(), but this is usable in const fn contexts.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Registers a new callsite with this collector, returning whether or not the collector is interested in being notified about the callsite. Read more

Visit the construction of a new span, returning a new span ID for the span being constructed. Read more

Records that an Event has occurred. Read more

Record a set of values on a span. Read more

Adds an indication that span follows from the span with the id follows. Read more

Returns true if a span or event with the specified metadata would be recorded. Read more

Returns a type representing this collector’s view of the current span. Read more

Records that a span has been entered. Read more

Records that a span has been exited. Read more

Returns the highest verbosity level that this Collector will enable, or None, if the collector does not implement level-based filtering or chooses not to implement this method. Read more

Notifies the collector that a span ID has been cloned. Read more

👎 Deprecated since 0.1.2:

use Collector::try_close instead

This method is deprecated. Read more

Notifies the collector that a span ID has been dropped, and returns true if there are now 0 IDs that refer to that span. Read more

If self is the same type as the provided TypeId, returns an untyped NonNull pointer to that type. Otherwise, returns None. Read more

Formats the value using the given formatter. Read more

Returns the “default value” for a type. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into #41263)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Available on crate feature std only.

Attaches the provided collector to this type, returning a WithDispatch wrapper. Read more

Available on crate feature std only.

Attaches the current default collector to this type, returning a WithDispatch wrapper. Read more