🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

For the release documentation, please see docs.rs, instead.

tracing_subscriber::registry

Struct ExtensionsMut

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pub struct ExtensionsMut<'a> { /* private fields */ }
Available on crate feature std only.
Expand description

An mutable reference to a Span’s extensions.

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impl<'a> ExtensionsMut<'a>

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pub fn insert<T: Send + Sync + 'static>(&mut self, val: T)

Insert a type into this Extensions.

Note that extensions are not subscriber-specific—they are span-specific. This means that other subscribers can access and mutate extensions that a different Subscriber recorded. For example, an application might have a subscriber that records execution timings, alongside a subscriber that reports spans and events to a distributed tracing system that requires timestamps for spans. Ideally, if one subscriber records a timestamp x, the other subscriber should be able to reuse timestamp x.

Therefore, extensions should generally be newtypes, rather than common types like String, to avoid accidental cross-Subscriber clobbering.

§Panics

If T is already present in Extensions, then this method will panic.

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pub fn replace<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T>

Replaces an existing T into this extensions.

If T is not present, Option::None will be returned.

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pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T>

Get a mutable reference to a type previously inserted on this ExtensionsMut.

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pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T>

Remove a type from this Extensions.

If a extension of this type existed, it will be returned.

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impl<'a> Debug for ExtensionsMut<'a>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a> Freeze for ExtensionsMut<'a>

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impl<'a> !RefUnwindSafe for ExtensionsMut<'a>

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impl<'a> !Send for ExtensionsMut<'a>

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impl<'a> Sync for ExtensionsMut<'a>

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impl<'a> Unpin for ExtensionsMut<'a>

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impl<'a> !UnwindSafe for ExtensionsMut<'a>

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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> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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<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.
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impl<T> WithCollector for T

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fn with_collector<C>(self, collector: C) -> WithDispatch<Self>
where C: Into<Dispatch>,

Attaches the provided collector to this type, returning a WithDispatch wrapper. Read more
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fn with_current_collector(self) -> WithDispatch<Self>

Attaches the current default collector to this type, returning a WithDispatch wrapper. Read more