Struct tracing_subscriber::fmt::writer::OrElse

pub struct OrElse<A, B> { /* private fields */ }

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

impl<A, B> OrElse<A, B>

pub fn new<'a, W>(inner: A, or_else: B) -> Self

where A: MakeWriter<'a, Writer = OptionalWriter<W>>, B: MakeWriter<'a>, W: Write,

Combines

Trait Implementations

impl<A: Clone, B: Clone> Clone for OrElse<A, B>

fn clone(&self) -> OrElse<A, B>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<A: Debug, B: Debug> Debug for OrElse<A, B>

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

Formats the value using the given formatter.

impl<'a, A, B, W> MakeWriter<'a> for OrElse<A, B>

where A: MakeWriter<'a, Writer = OptionalWriter<W>>, B: MakeWriter<'a>, W: Write,

type Writer = EitherWriter<W, <B as MakeWriter<'a>>::Writer>

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<A: PartialEq, B: PartialEq> PartialEq for OrElse<A, B>

fn eq(&self, other: &OrElse<A, B>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl<A: Copy, B: Copy> Copy for OrElse<A, B>

impl<A: Eq, B: Eq> Eq for OrElse<A, B>

impl<A, B> StructuralPartialEq for OrElse<A, B>