Struct tracing_subscriber::fmt::FormattedFields [−][src]
fmt
and std
only.Expand description
A formatted representation of a span’s fields stored in its extensions.
Because FormattedFields
is generic over the type of the formatter that
produced it, multiple versions of a span’s formatted fields can be stored in
the Extensions
type-map. This means that when multiple
formatters are in use, each can store its own formatted representation
without conflicting.
Fields
fields: String
The formatted fields of a span.
Implementations
Returns a new format::Writer
for writing to this FormattedFields
.
The returned format::Writer
can be used with the
FormatFields::format_fields
method.
Methods from Deref<Target = String>
Extracts a string slice containing the entire String
.
Examples
Basic usage:
let s = String::from("foo");
assert_eq!("foo", s.as_str());
Returns this String
’s capacity, in bytes.
Examples
Basic usage:
let s = String::with_capacity(10);
assert!(s.capacity() >= 10);
Returns the length of this String
, in bytes, not char
s or
graphemes. In other words, it might not be what a human considers the
length of the string.
Examples
Basic usage:
let a = String::from("foo");
assert_eq!(a.len(), 3);
let fancy_f = String::from("ƒoo");
assert_eq!(fancy_f.len(), 4);
assert_eq!(fancy_f.chars().count(), 3);
Trait Implementations
Auto Trait Implementations
impl<E: ?Sized> RefUnwindSafe for FormattedFields<E>
impl<E: ?Sized> Send for FormattedFields<E>
impl<E: ?Sized> Sync for FormattedFields<E>
impl<E: ?Sized> Unpin for FormattedFields<E>
impl<E: ?Sized> UnwindSafe for FormattedFields<E>
Blanket Implementations
Mutably borrows from an owned value. Read more
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more