Struct tracing::field::Field[][src]

pub struct Field { /* fields omitted */ }

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[src]

pub fn callsite(&self) -> Identifier[src]

Returns an Identifier that uniquely identifies the Callsite which defines this field.

pub fn name(&self) -> &'static str[src]

Returns a string representing the name of the field.

Trait Implementations

impl AsField for Field[src]

impl<'a> AsField for &'a Field[src]

impl AsRef<str> for Field[src]

impl Clone for Field[src]

impl Debug for Field[src]

impl Display for Field[src]

impl Eq for Field[src]

impl Hash for Field[src]

impl PartialEq<Field> for Field[src]

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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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

impl<T> Instrument for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T> ToString for T where
    T: Display + ?Sized
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.