Struct tracing_core::field::FieldSet

[+] Show declaration

pub struct FieldSet { /* fields omitted */ }

[−] Expand description

Describes the fields present on a span.

Implementations

impl FieldSet[−]

pub const fn new(names: &'static [&'static str], callsite: Identifier) -> Self[−]

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>, [−]

Returns the Field named name, or None if no such field exists.

pub fn contains(&self, field: &Field) -> bool[−]

Returns true if self contains the given field.

Note: If field shares a name with a field in this FieldSet, but was created by a FieldSet with a different callsite, this FieldSet does not contain it. This is so that if two separate span callsites define a field named "foo", the Field corresponding to "foo" for each of those callsites are not equivalent.

pub fn iter(&self) -> Iter[−]

Returns an iterator over the Fields in this FieldSet.

pub fn len(&self) -> usize[−]

Returns the number of fields in this FieldSet.

pub fn is_empty(&self) -> bool[−]

Returns whether or not this FieldSet has fields.

Trait Implementations

impl Debug for FieldSet[+]

[+] Show hidden undocumented items

fn fmt(&self, f: &mut Formatter<'_>) -> Result[−]

Formats the value using the given formatter.

impl Display for FieldSet[+]

[+] Show hidden undocumented items

fn fmt(&self, f: &mut Formatter<'_>) -> Result[−]

Formats the value using the given formatter.

impl<'a> IntoIterator for &'a FieldSet[+]

[+] Show hidden undocumented items

type IntoIter = Iter

Which kind of iterator are we turning this into?

type Item = Field

The type of the elements being iterated over.

fn into_iter(self) -> Self::IntoIter[−]

Creates an iterator from a value.