Trait tracing_subscriber::field::MakeVisitor

pub trait MakeVisitor<T> {
    type Visitor: Visit;

    // Required method
    fn make_visitor(&self, target: T) -> Self::Visitor;
}

Creates new visitors.

A type implementing MakeVisitor represents a composable factory for types implementing the Visit trait. The MakeVisitor trait defines a single function, make_visitor, which takes in a T-typed target and returns a type implementing Visit configured for that target. A target may be a string, output stream, or data structure that the visitor will record data to, configuration variables that determine the visitor’s behavior, or () when no input is required to produce a visitor.

Required Associated Types

type Visitor: Visit

The visitor type produced by this MakeVisitor.

Required Methods

fn make_visitor(&self, target: T) -> Self::Visitor

Make a new visitor for the provided target.

Implementors

impl<'a> MakeVisitor<Writer<'a>> for DefaultFields

Available on crate features fmt and std only.

type Visitor = DefaultVisitor<'a>

impl<'a> MakeVisitor<Writer<'a>> for PrettyFields

Available on crate features fmt and std only.

type Visitor = PrettyVisitor<'a>

impl<'a, F> MakeVisitor<Writer<'a>> for FieldFn<F>

where F: Fn(&mut Writer<'a>, &Field, &dyn Debug) -> Result + Clone,

Available on crate features fmt and std only.

type Visitor = FieldFnVisitor<'a, F>

impl<D, V, T> MakeVisitor<T> for Delimited<D, V>

where D: AsRef<str> + Clone, V: MakeVisitor<T>, V::Visitor: VisitFmt,

type Visitor = VisitDelimited<D, <V as MakeVisitor<T>>::Visitor>

impl<T, V> MakeVisitor<T> for Alt<V>

where V: MakeVisitor<T>,

type Visitor = Alt<<V as MakeVisitor<T>>::Visitor>

impl<T, V> MakeVisitor<T> for Messages<V>

where V: MakeVisitor<T>,

type Visitor = Messages<<V as MakeVisitor<T>>::Visitor>

impl<T, V, F> MakeVisitor<T> for F

where F: Fn(T) -> V, V: Visit,

type Visitor = V