Struct tracing_subscriber::fmt::writer::WithFilter

pub struct WithFilter<M, F> { /* private fields */ }

Available on crate features fmt and std only.

A MakeWriter combinator that wraps a MakeWriter with a predicate for span and event Metadata, so that the MakeWriter::make_writer_for method returns OptionalWriter::some when the predicate returns true, and OptionalWriter::none when the predicate returns false.

This is returned by the MakeWriterExt::with_filter method. See the method documentation for details.

Implementations

impl<M, F> WithFilter<M, F>

pub fn new(make: M, filter: F) -> Self

where F: Fn(&Metadata<'_>) -> bool,

Wraps make with the provided filter, returning a MakeWriter that will call make.make_writer_for() when filter returns true for a span or event’s Metadata, and returns a sink otherwise.

See MakeWriterExt::with_filter for details.

Trait Implementations

impl<M: Clone, F: Clone> Clone for WithFilter<M, F>

fn clone(&self) -> WithFilter<M, F>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<M: Debug, F: Debug> Debug for WithFilter<M, F>

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

Formats the value using the given formatter.

impl<'a, M, F> MakeWriter<'a> for WithFilter<M, F>

where M: MakeWriter<'a>, F: Fn(&Metadata<'_>) -> bool,

type Writer = EitherWriter<<M as MakeWriter<'a>>::Writer, Sink>

The concrete io::Write implementation returned by make_writer.

fn make_writer(&'a self) -> Self::Writer

Returns an instance of Writer.

fn make_writer_for(&'a self, meta: &Metadata<'_>) -> Self::Writer

Returns a Writer for writing data from the span or event described by the provided Metadata.

impl<M: PartialEq, F: PartialEq> PartialEq for WithFilter<M, F>

fn eq(&self, other: &WithFilter<M, F>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<M: Copy, F: Copy> Copy for WithFilter<M, F>

impl<M: Eq, F: Eq> Eq for WithFilter<M, F>

impl<M, F> StructuralEq for WithFilter<M, F>

impl<M, F> StructuralPartialEq for WithFilter<M, F>