Trait tracing_subscriber::field::RecordFields
source · pub trait RecordFields: Sealed<RecordFieldsMarker> {
// Required method
fn record(&self, visitor: &mut dyn Visit);
}Expand description
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);
}