Struct `Field`

pub struct Field { /* private fields */ }

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.

Implementations

`impl Field`

fn callsite(&self) -> Identifier: Returns an Identifier that uniquely identifies the Callsite which defines this field.
fn name(&self) -> &'static str: Returns a string representing the name of the field.
fn index(&self) -> usize: Returns the index of this field in its FieldSet.

Trait Implementations

`impl AsRef<str> for Field`

fn as_ref(&self) -> &str

`impl Clone for Field`

fn clone(&self) -> Self

`impl Debug for Field`

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

`impl Display for Field`

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

`impl Eq for Field`

`impl Hash for Field`

fn hash<H>(&self, state: &mut H) where H: Hasher,

`impl PartialEq for Field`

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

Auto Trait Implementations

`impl !RefUnwindSafe for Field`

`impl !UnwindSafe for Field`

`impl Freeze for Field`

`impl Send for Field`

`impl Sync for Field`

`impl Unpin for Field`

`impl UnsafeUnpin for Field`

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

`impl<T> CloneToUninit for Field where T: Clone,`

unsafe fn clone_to_uninit(&self, dest: *mut u8)

`impl<T> From<T> for Field`

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

`impl<T> ToOwned for Field where T: Clone,`

type Owned = T;
fn to_owned(&self) -> T
fn clone_into(&self, target: &mut T)

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

fn to_string(&self) -> String

`impl<T, U> Into for Field 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 Field where U: Into<T>,`

type Error = never;
fn try_from(value: U) -> Result<T, never>

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

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