Struct tracing_core::field::FieldSet [−][src]
Describes the fields present on a span.
Implementations
impl FieldSet
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pub const fn new(names: &'static [&'static str], callsite: Identifier) -> Self
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Constructs a new FieldSet
with the given array of field names and callsite.
pub fn field<Q: ?Sized>(&self, name: &Q) -> Option<Field> where
Q: Borrow<str>,
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Q: Borrow<str>,
Returns the Field
named name
, or None
if no such field exists.
pub fn contains(&self, field: &Field) -> bool
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Returns true
if self
contains the given field
.
ⓘNote
Note: Iffield
shares a name with a field in thisFieldSet
, but was created by aFieldSet
with a different callsite, thisFieldSet
does not contain it. This is so that if two separate span callsites define a field named "foo", theField
corresponding to "foo" for each of those callsites are not equivalent.
pub fn iter(&self) -> Iterⓘ
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Returns an iterator over the Field
s in this FieldSet
.
pub fn len(&self) -> usize
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Returns the number of fields in this FieldSet
.
pub fn is_empty(&self) -> bool
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Returns whether or not this FieldSet
has fields.
Trait Implementations
impl Debug for FieldSet
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impl Display for FieldSet
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impl<'a> IntoIterator for &'a FieldSet
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Auto Trait Implementations
impl !RefUnwindSafe for FieldSet
impl Send for FieldSet
impl Sync for FieldSet
impl Unpin for FieldSet
impl !UnwindSafe for FieldSet
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> 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>,