logo
pub struct NoSubscriber(_);
Expand description

A no-op Subscriber.

NoSubscriber implements the Subscriber trait by never being enabled, never being interested in any callsite, and dropping all spans and events.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Registers a new callsite with this subscriber, returning whether or not the subscriber 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
Records that a span has been entered. Read more
Records that a span has been exited. Read more
Invoked when this subscriber becomes a Dispatch. Read more
Returns the highest verbosity level that this Subscriber will enable, or None, if the subscriber does not implement level-based filtering or chooses not to implement this method. Read more
Determine if an Event should be recorded. Read more
Notifies the subscriber that a span ID has been cloned. Read more
👎Deprecated since 0.1.2: use Subscriber::try_close instead
This method is deprecated. Read more
Notifies the subscriber that a span ID has been dropped, and returns true if there are now 0 IDs that refer to that span. Read more
Returns a type representing this subscriber’s view of the current span. Read more
If self is the same type as the provided TypeId, returns an untyped *const pointer to that type. Otherwise, returns None. 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
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.
Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more