tracing_subscriber::fmt::writer

Struct OrElse

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pub struct OrElse<A, B> { /* private fields */ }
Available on crate features fmt and std only.
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.

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

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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§

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

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<A: Debug, B: Debug> Debug for OrElse<A, B>

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

Formats the value using the given formatter. Read more
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impl<'a, A, B, W> MakeWriter<'a> for OrElse<A, B>
where A: MakeWriter<'a, Writer = OptionalWriter<W>>, B: MakeWriter<'a>, W: Write,

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

The concrete io::Write implementation returned by make_writer.
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fn make_writer(&'a self) -> Self::Writer

Returns an instance of Writer. Read more
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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. Read more
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impl<A: PartialEq, B: PartialEq> PartialEq for OrElse<A, B>

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<A: Copy, B: Copy> Copy for OrElse<A, B>

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

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

Auto Trait Implementations§

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impl<A, B> Freeze for OrElse<A, B>
where A: Freeze, B: Freeze,

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impl<A, B> RefUnwindSafe for OrElse<A, B>
where A: RefUnwindSafe, B: RefUnwindSafe,

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impl<A, B> Send for OrElse<A, B>
where A: Send, B: Send,

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impl<A, B> Sync for OrElse<A, B>
where A: Sync, B: Sync,

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impl<A, B> Unpin for OrElse<A, B>
where A: Unpin, B: Unpin,

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impl<A, B> UnwindSafe for OrElse<A, B>
where A: UnwindSafe, B: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<'a, M> MakeWriterExt<'a> for M
where M: MakeWriter<'a>,

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fn with_max_level(self, level: Level) -> WithMaxLevel<Self>
where Self: Sized,

Available on crate features fmt and std only.
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
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fn with_min_level(self, level: Level) -> WithMinLevel<Self>
where Self: Sized,

Available on crate features fmt and std only.
Wraps self and returns a MakeWriter that will only write output for events at or above the provided verbosity Level. Read more
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fn with_filter<F>(self, filter: F) -> WithFilter<Self, F>
where Self: Sized, F: Fn(&Metadata<'_>) -> bool,

Available on crate features fmt and std only.
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
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fn and<B>(self, other: B) -> Tee<Self, B> ⓘ
where Self: Sized, B: MakeWriter<'a> + Sized,

Available on crate features fmt and std only.
Combines self with another type implementing MakeWriter, returning a new MakeWriter that produces writers that write to both outputs. Read more
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fn or_else<W, B>(self, other: B) -> OrElse<Self, B>
where Self: MakeWriter<'a, Writer = OptionalWriter<W>> + Sized, B: MakeWriter<'a> + Sized, W: Write,

Available on crate features fmt and std only.
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
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.