Struct tracing_subscriber::fmt::format::FieldFn

pub struct FieldFn<F>(_);

A FormatFields implementation that formats fields by calling a function or closure.

Trait Implementations

impl<F: Clone> Clone for FieldFn<F>

fn clone(&self) -> FieldFn<F>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<F: Debug> Debug for FieldFn<F>

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

Formats the value using the given formatter.

impl<'a, F> MakeVisitor<&'a mut (dyn Write + 'a)> for FieldFn<F>where
    F: Fn(&mut dyn Write, &Field, &dyn Debug) -> Result + Clone,

type Visitor = FieldFnVisitor<'a, F>

The visitor type produced by this MakeVisitor.

fn make_visitor(&self, writer: &'a mut dyn Write) -> Self::Visitor

Make a new visitor for the provided target.