Struct tokio::task::futures::TaskLocalFuture

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pub struct TaskLocalFuture<T, F> where
    T: 'static,  { /* private fields */ }

Expand description

A future that sets a value T of a task local for the future F during its execution.

The value of the task-local must be 'static and will be dropped on the completion of the future.

Created by the function LocalKey::scope.

Examples

tokio::task_local! {
    static NUMBER: u32;
}

NUMBER.scope(1, async move {
    println!("task local value: {}", NUMBER.get());
}).await;

Trait Implementations

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impl<T: 'static, F: Future> Future for TaskLocalFuture<T, F>

type Output = F::Output

The type of value produced on completion.

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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more

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impl<'pin, T, F> Unpin for TaskLocalFuture<T, F> where
Origin<'__pin, T, F>: Unpin,
T: 'static,

Auto Trait Implementations

impl<T, F> RefUnwindSafe for TaskLocalFuture<T, F> where
F: RefUnwindSafe,
T: RefUnwindSafe,

impl<T, F> Send for TaskLocalFuture<T, F> where
F: Send,
T: Send,

impl<T, F> Sync for TaskLocalFuture<T, F> where
F: Sync,
T: Sync,

impl<T, F> UnwindSafe for TaskLocalFuture<T, F> where
F: UnwindSafe,
T: 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,

const: unstable · source

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,

const: unstable · source

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

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source

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<F> IntoFuture for F where
F: Future,

type Output = <F as Future>::Output

🔬 This is a nightly-only experimental API. (into_future)

The output that the future will produce on completion.

type IntoFuture = F

🔬 This is a nightly-only experimental API. (into_future)

Which kind of future are we turning this into?

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fn into_future(self) -> <F as IntoFuture>::IntoFuture

🔬 This is a nightly-only experimental API. (into_future)

Creates a future from a value.

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct tokio::task::futures::TaskLocalFuture

Examples

Trait Implementations

impl<T: 'static, F: Future> Future for TaskLocalFuture<T, F>

type Output = F::Output

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

impl<'pin, T, F> Unpin for TaskLocalFuture<T, F> where
Origin<'__pin, T, F>: Unpin,
T: 'static,

Auto Trait Implementations

impl<T, F> RefUnwindSafe for TaskLocalFuture<T, F> where
F: RefUnwindSafe,
T: RefUnwindSafe,

impl<T, F> Send for TaskLocalFuture<T, F> where
F: Send,
T: Send,

impl<T, F> Sync for TaskLocalFuture<T, F> where
F: Sync,
T: Sync,

impl<T, F> UnwindSafe for TaskLocalFuture<T, F> where
F: UnwindSafe,
T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where
T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where
T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<F> IntoFuture for F where
F: Future,

type Output = <F as Future>::Output

type IntoFuture = F

fn into_future(self) -> <F as IntoFuture>::IntoFuture

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Struct tokio::task::futures::TaskLocalFuture

Examples

Trait Implementations

impl<T: 'static, F: Future> Future for TaskLocalFuture<T, F>

type Output = F::Output

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

impl<'__pin, T, F> Unpin for TaskLocalFuture<T, F> where __Origin<'__pin, T, F>: Unpin, T: 'static,

Auto Trait Implementations

impl<T, F> RefUnwindSafe for TaskLocalFuture<T, F> where F: RefUnwindSafe, T: RefUnwindSafe,

impl<T, F> Send for TaskLocalFuture<T, F> where F: Send, T: Send,

impl<T, F> Sync for TaskLocalFuture<T, F> where F: Sync, T: Sync,

impl<T, F> UnwindSafe for TaskLocalFuture<T, F> where F: UnwindSafe, T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<F> IntoFuture for F where F: Future,

type Output = <F as Future>::Output

type IntoFuture = F

fn into_future(self) -> <F as IntoFuture>::IntoFuture

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<'pin, T, F> Unpin for TaskLocalFuture<T, F> where
Origin<'__pin, T, F>: Unpin,
T: 'static,

impl<T, F> RefUnwindSafe for TaskLocalFuture<T, F> where
F: RefUnwindSafe,
T: RefUnwindSafe,

impl<T, F> Send for TaskLocalFuture<T, F> where
F: Send,
T: Send,

impl<T, F> Sync for TaskLocalFuture<T, F> where
F: Sync,
T: Sync,

impl<T, F> UnwindSafe for TaskLocalFuture<T, F> where
F: UnwindSafe,
T: UnwindSafe,

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

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

impl<F> IntoFuture for F where
F: Future,

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,