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.

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§0: ()

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impl NoSubscriber

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pub const fn new() -> Self

Returns a new NoSubscriber.

Trait Implementations§

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impl Clone for NoSubscriber

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fn clone(&self) -> NoSubscriber

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for NoSubscriber

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

Formats the value using the given formatter. Read more
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impl Default for NoSubscriber

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fn default() -> NoSubscriber

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

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fn register_callsite(&self, _: &'static Metadata<'static>) -> Interest

Registers a new callsite with this subscriber, returning whether or not the subscriber is interested in being notified about the callsite. Read more
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fn new_span(&self, _: &Attributes<'_>) -> Id

Visit the construction of a new span, returning a new span ID for the span being constructed. Read more
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fn event(&self, _event: &Event<'_>)

Records that an Event has occurred. Read more
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fn record(&self, _span: &Id, _values: &Record<'_>)

Record a set of values on a span. Read more
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fn record_follows_from(&self, _span: &Id, _follows: &Id)

Adds an indication that span follows from the span with the id follows. Read more
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fn enabled(&self, _metadata: &Metadata<'_>) -> bool

Returns true if a span or event with the specified metadata would be recorded. Read more
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fn enter(&self, _span: &Id)

Records that a span has been entered. Read more
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fn exit(&self, _span: &Id)

Records that a span has been exited. Read more
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fn on_register_dispatch(&self, subscriber: &Dispatch)

Invoked when this subscriber becomes a Dispatch. Read more
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fn max_level_hint(&self) -> Option<LevelFilter>

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
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fn event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded. Read more
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fn clone_span(&self, id: &Id) -> Id

Notifies the subscriber that a span ID has been cloned. Read more
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fn drop_span(&self, _id: Id)

👎Deprecated since 0.1.2: use Subscriber::try_close instead
This method is deprecated. Read more
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fn try_close(&self, id: Id) -> bool

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
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fn current_span(&self) -> Current

Returns a type representing this subscriber’s view of the current span. Read more
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unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()>

If self is the same type as the provided TypeId, returns an untyped *const pointer to that type. Otherwise, returns None. Read more
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impl Copy for NoSubscriber

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.