Trait RecordFields 

pub trait RecordFields: Sealed<RecordFieldsMarker> {
    // Required method
    fn record(&self, visitor: &mut dyn Visit);
}

Extension trait implemented by types which can be recorded by a visitor.

This allows writing code that is generic over tracing_core’s span::Attributes, span::Record, and Event types. These types all provide inherent record methods that allow a visitor to record their fields, but there is no common trait representing this.

With RecordFields, we can write code like this:

use tracing_core::field::Visit;
use tracing_subscriber::field::RecordFields;

struct MyVisitor {
    // ...
}
impl Visit for MyVisitor {
    // ...
}

fn record_with_my_visitor<R>(r: R)
where
    R: RecordFields,
{
    let mut visitor = MyVisitor::new();
    r.record(&mut visitor);
}

Required Methods

fn record(&self, visitor: &mut dyn Visit)

Record all the fields in self with the provided visitor.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl RecordFields for Attributes<'_>

fn record(&self, visitor: &mut dyn Visit)

impl RecordFields for Event<'_>

fn record(&self, visitor: &mut dyn Visit)

impl RecordFields for Record<'_>

fn record(&self, visitor: &mut dyn Visit)

impl<F> RecordFields for &F

where F: RecordFields,

fn record(&self, visitor: &mut dyn Visit)

Implementors