[−][src]Struct tracing_core::field::Field
An opaque key allowing O(1) access to a field in a Span
's key-value
data.
As keys are defined by the metadata of a span, rather than by an individual instance of a span, a key may be used to access the same field across all instances of a given span with the same metadata. Thus, when a subscriber observes a new span, it need only access a field by name once, and use the key for that name for all other accesses.
Implementations
impl Field
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pub fn callsite(&self) -> Identifier
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Returns an Identifier
that uniquely identifies the Callsite
which defines this field.
pub fn name(&self) -> &'static str
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Returns a string representing the name of the field.
Trait Implementations
impl AsRef<str> for Field
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impl Clone for Field
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impl Debug for Field
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impl Display for Field
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impl Eq for Field
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impl Hash for Field
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impl PartialEq<Field> for Field
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Auto Trait Implementations
impl !RefUnwindSafe for Field
impl Send for Field
impl Sync for Field
impl Unpin for Field
impl !UnwindSafe for Field
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,
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> ToOwned for T where
T: Clone,
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T: Clone,
impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,