Struct tracing_subscriber::fmt::writer::WithFilter [−][src]
pub struct WithFilter<M, F> { /* fields omitted */ }Expand description
A MakeWriter combinator that wraps a MakeWriter with a predicate for
span and event Metadata, so that the [MakeWriterExt::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
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
type Writer = OptionalWriter<M::Writer>
type Writer = OptionalWriter<M::Writer>
The concrete io::Write implementation returned by make_writer. Read more
This method tests for self and other values to be equal, and is used
by ==. Read more
This method tests for !=.
Auto Trait Implementations
impl<M, F> RefUnwindSafe for WithFilter<M, F> where
F: RefUnwindSafe,
M: RefUnwindSafe,
impl<M, F> Send for WithFilter<M, F> where
F: Send,
M: Send,
impl<M, F> Sync for WithFilter<M, F> where
F: Sync,
M: Sync,
impl<M, F> Unpin for WithFilter<M, F> where
F: Unpin,
M: Unpin,
impl<M, F> UnwindSafe for WithFilter<M, F> where
F: UnwindSafe,
M: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
Wraps self and returns a MakeWriter that will only write output
for events at or below the provided verbosity Level. For instance,
Level::TRACE is considered to be _more verbosethanLevel::INFO`. Read more
Wraps self and returns a MakeWriter that will only write output
for events at or above the provided verbosity Level. Read more
fn with_filter<F>(self, filter: F) -> WithFilter<Self, F> where
Self: Sized,
F: Fn(&Metadata<'_>) -> bool,
fn with_filter<F>(self, filter: F) -> WithFilter<Self, F> where
Self: Sized,
F: Fn(&Metadata<'_>) -> bool,
Wraps self with a predicate that takes a span or event’s Metadata
and returns a bool. The returned MakeWriter’s
MakeWriter::make_writer_for method will check the predicate to
determine if a writer should be produced for a given span or event. Read more
Combines self with another type implementing MakeWriter, returning
a new MakeWriter that produces [writers] that write to both
outputs. Read more
fn or_else<W, B>(self, other: B) -> OrElse<Self, B> where
Self: MakeWriter<Writer = OptionalWriter<W>> + Sized,
B: MakeWriter + Sized,
W: Write,
fn or_else<W, B>(self, other: B) -> OrElse<Self, B> where
Self: MakeWriter<Writer = OptionalWriter<W>> + Sized,
B: MakeWriter + Sized,
W: Write,
Combines self with another type implementing MakeWriter, returning
a new MakeWriter that calls other’s [make_writer] if self’s
make_writer returns OptionalWriter::none. Read more