Struct tracing_core::span::Current [−][src]
Indicates what the Subscriber
considers the “current” span.
As subscribers may not track a notion of a current span, this has three possible states:
Implementations
impl Current
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pub fn new(id: Id, metadata: &'static Metadata<'static>) -> Self
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Constructs a new Current
that indicates the current context is a span
with the given metadata
and metadata
.
pub fn none() -> Self
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Constructs a new Current
that indicates the current context is not
in a span.
pub fn is_known(&self) -> bool
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Returns true
if the Subscriber
that constructed this Current
tracks a
current span.
If this returns true
and id
, metadata
, or into_inner
return None
, that indicates that we are currently known to not be
inside a span. If this returns false
, those methods will also return
None
, but in this case, that is because the subscriber does not keep
track of the currently-entered span.
pub fn into_inner(self) -> Option<(Id, &'static Metadata<'static>)>
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Consumes self
and returns the span Id
and Metadata
of the current
span, if one exists and is known.
pub fn id(&self) -> Option<&Id>
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Borrows the Id
of the current span, if one exists and is known.
pub fn metadata(&self) -> Option<&'static Metadata<'static>>
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Borrows the Metadata
of the current span, if one exists and is known.
Trait Implementations
impl Debug for Current
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impl<'a> From<&'a Current> for Option<&'a Id>
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impl<'a> From<&'a Current> for Option<Id>
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impl<'a> From<&'a Current> for Option<&'static Metadata<'static>>
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impl From<Current> for Option<Id>
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Auto Trait Implementations
impl !RefUnwindSafe for Current
impl Send for Current
impl Sync for Current
impl Unpin for Current
impl !UnwindSafe for Current
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,