Struct `FieldSet`

pub struct FieldSet { /* private fields */ }

Describes the fields present on a span.

Equality

In well-behaved applications, two FieldSets initialized with equal callsite identifiers will have identical fields. Consequently, in release builds, FieldSet::eq only checks that its arguments have equal callsites. However, the equality of field names is checked in debug builds.

Implementations

`impl FieldSet`

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

Constructs a new FieldSet with the given array of field names and callsite.

fn field<Q: Borrow<str> + ?Sized>(&self, name: &Q) -> Option<Field>

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

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.

fn iter(&self) -> Iter

Returns an iterator over the Fields in this FieldSet.

fn len(&self) -> usize

Returns the number of fields in this FieldSet.

fn is_empty(&self) -> bool

Returns whether or not this FieldSet has fields.

Trait Implementations

`impl Debug for FieldSet`

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

`impl Display for FieldSet`

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

`impl Eq for FieldSet`

`impl PartialEq for FieldSet`

fn eq(&self, other: &Self) -> bool

Auto Trait Implementations

`impl !RefUnwindSafe for FieldSet`

`impl !UnwindSafe for FieldSet`

`impl Freeze for FieldSet`

`impl Send for FieldSet`

`impl Sync for FieldSet`

`impl Unpin for FieldSet`

`impl UnsafeUnpin for FieldSet`

Blanket Implementations

`impl<T> Any for FieldSet where T: 'static + ?Sized,`

fn type_id(&self) -> TypeId

`impl<T> Borrow<T> for FieldSet where T: ?Sized,`

fn borrow(&self) -> &T

`impl<T> BorrowMut<T> for FieldSet where T: ?Sized,`

fn borrow_mut(&mut self) -> &mut T

`impl<T> From<T> for FieldSet`

fn from(t: T) -> T: Returns the argument unchanged.

`impl<T> ToString for FieldSet where T: Display + ?Sized,`

fn to_string(&self) -> String

`impl<T, U> Into for FieldSet where U: From<T>,`

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of [From]<T> for U chooses to do.

`impl<T, U> TryFrom for FieldSet where U: Into<T>,`

type Error = Infallible;
fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

`impl<T, U> TryInto for FieldSet where U: TryFrom<T>,`

type Error = >::Error;
fn try_into(self) -> Result<U, >::Error>