Struct tracing_subscriber::fmt::writer::OrElse [−][src]
pub struct OrElse<A, B> { /* fields omitted */ }Expand description
Combines a MakeWriter that returns an OptionalWriter with another
MakeWriter, so that the second MakeWriter is used when the first
MakeWriter returns OptionalWriter::none.
This is returned by the `MakeWriterExt::or_else method. See the method documentation for details.
Implementations
pub fn new<W>(inner: A, or_else: B) -> Self where
A: MakeWriter<Writer = OptionalWriter<W>>,
B: MakeWriter,
W: Write,
pub fn new<W>(inner: A, or_else: B) -> Self where
A: MakeWriter<Writer = OptionalWriter<W>>,
B: MakeWriter,
W: Write,
Combines
Trait Implementations
impl<A, B, W> MakeWriter for OrElse<A, B> where
A: MakeWriter<Writer = OptionalWriter<W>>,
B: MakeWriter,
W: Write,
impl<A, B, W> MakeWriter for OrElse<A, B> where
A: MakeWriter<Writer = OptionalWriter<W>>,
B: MakeWriter,
W: Write,
type Writer = EitherWriter<W, B::Writer>
type Writer = EitherWriter<W, B::Writer>
The concrete io::Write implementation returned by make_writer. Read more
Auto Trait Implementations
impl<A, B> RefUnwindSafe for OrElse<A, B> where
A: RefUnwindSafe,
B: RefUnwindSafe,
impl<A, B> UnwindSafe for OrElse<A, B> where
A: UnwindSafe,
B: 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