Struct tracing_subscriber::fmt::FmtContext

pub struct FmtContext<'a, S, N> { /* fields omitted */ }

This is supported on feature="fmt" only.

Provides the current span context to a formatter.

Methods

impl<'a, S, N> FmtContext<'a, S, N> where
    S: Subscriber + for<'lookup> LookupSpan<'lookup>,
    N: for<'writer> FormatFields<'writer> + 'static, 

pub fn visit_spans<E, F>(&self, f: F) -> Result<(), E> where
    F: FnMut(&SpanRef<S>) -> Result<(), E>, 

This is supported on feature="fmt" only.

Visits every span in the current context with a closure.

The provided closure will be called first with the current span, and then with that span's parent, and then that span's parent, and so on until a root span is reached.

Trait Implementations

impl<'a, S, N> Debug for FmtContext<'a, S, N>

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

Formats the value using the given formatter.

impl<'a, S, N> FormatFields<'a> for FmtContext<'a, S, N> where
    S: Subscriber + for<'lookup> LookupSpan<'lookup>,
    N: for<'writer> FormatFields<'writer> + 'static, 

fn format_fields<R: RecordFields>(
    &self,
    writer: &'a mut dyn Write,
    fields: R
) -> Result

This is supported on feature="fmt" only.

Format the provided fields to the provided writer, returning a result.