pub struct Field { /* fields omitted */ }
Expand description
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.
Returns a string representing the name of the field.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
impl<T> Any for T where
T: 'static + ?Sized,
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
impl<T, U> Into<U> for T where
U: From<T>,
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (
toowned_clone_into
#41263)
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
The type returned in the event of a conversion error.
The type returned in the event of a conversion error.