Struct delay_timer::prelude::future_lite::PollOnce[−]

#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct PollOnce<F> { /* fields omitted */ }

Expand description

Future for the poll_once() function.

Trait Implementations

impl<F> Debug for PollOnce<F>

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

Formats the value using the given formatter. Read more

impl<T, F> Future for PollOnce<F> where
    F: Future<Output = T>,

type Output = Option<T>

The type of value produced on completion.

pub fn poll(
    self: Pin<&mut PollOnce<F>>, 
    cx: &mut Context<'_>
) -> Poll<<PollOnce<F> as Future>::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

impl<'__pin, F> Unpin for PollOnce<F> where
    __Origin<'__pin, F>: Unpin,

Auto Trait Implementations

impl<F> RefUnwindSafe for PollOnce<F> where
    F: RefUnwindSafe,

impl<F> Send for PollOnce<F> where
    F: Send,

impl<F> Sync for PollOnce<F> where
    F: Sync,

impl<F> UnwindSafe for PollOnce<F> where
    F: UnwindSafe,

Blanket Implementations

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

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pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

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

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pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

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

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pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T> FutureExt for T where
    T: Future + ?Sized,

fn map<U, F>(self, f: F) -> Map<Self, F>ⓘNotable traits for Map<Fut, F>
impl<Fut, F> Future for Map<Fut, F> where
    Map<Fut, F>: Future,     type Output = <Map<Fut, F> as Future>::Output; where
    F: FnOnce(Self::Output) -> U,

Map this future’s output to a different type, returning a new future of the resulting type. Read more

fn map_into<U>(self) -> MapInto<Self, U>ⓘNotable traits for MapInto<Fut, T>
impl<Fut, T> Future for MapInto<Fut, T> where
    Map<Fut, IntoFn<T>>: Future,     type Output = <Map<Fut, IntoFn<T>> as Future>::Output; where
    Self::Output: Into<U>,

Map this future’s output to a different type, returning a new future of the resulting type. Read more

fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F>ⓘNotable traits for Then<Fut1, Fut2, F>
impl<Fut1, Fut2, F> Future for Then<Fut1, Fut2, F> where
    Flatten<Map<Fut1, F>, Fut2>: Future,     type Output = <Flatten<Map<Fut1, F>, Fut2> as Future>::Output; where
    F: FnOnce(Self::Output) -> Fut,
    Fut: Future,

Chain on a computation for when a future finished, passing the result of the future to the provided closure f. Read more

fn left_future<B>(self) -> Either<Self, B>ⓘNotable traits for Either<A, B>
impl<A, B> Future for Either<A, B> where
    A: Future,
    B: Future<Output = <A as Future>::Output>,     type Output = <A as Future>::Output; where
    B: Future<Output = Self::Output>,

Wrap this future in an Either future, making it the left-hand variant of that Either. Read more

fn right_future<A>(self) -> Either<A, Self>ⓘNotable traits for Either<A, B>
impl<A, B> Future for Either<A, B> where
    A: Future,
    B: Future<Output = <A as Future>::Output>,     type Output = <A as Future>::Output; where
    A: Future<Output = Self::Output>,

Wrap this future in an Either future, making it the right-hand variant of that Either. Read more

fn into_stream(self) -> IntoStream<Self>

Convert this future into a single element stream. Read more

fn flatten(self) -> Flatten<Self>ⓘNotable traits for Flatten<F>
impl<F> Future for Flatten<F> where
    F: Future,
    Flatten<F, <F as Future>::Output>: Future,     type Output = <Flatten<F, <F as Future>::Output> as Future>::Output; where
    Self::Output: Future,

Flatten the execution of this future when the output of this future is itself another future. Read more

fn flatten_stream(self) -> FlattenStream<Self> where
    Self::Output: Stream,

Flatten the execution of this future when the successful result of this future is a stream. Read more

fn fuse(self) -> Fuse<Self>ⓘNotable traits for Fuse<Fut>
impl<Fut> Future for Fuse<Fut> where
    Fut: Future,     type Output = <Fut as Future>::Output;

Fuse a future such that poll will never again be called once it has completed. This method can be used to turn any Future into a FusedFuture. Read more

fn inspect<F>(self, f: F) -> Inspect<Self, F>ⓘNotable traits for Inspect<Fut, F>
impl<Fut, F> Future for Inspect<Fut, F> where
    Map<Fut, InspectFn<F>>: Future,     type Output = <Map<Fut, InspectFn<F>> as Future>::Output; where
    F: FnOnce(&Self::Output),

Do something with the output of a future before passing it on. Read more

fn catch_unwind(self) -> CatchUnwind<Self>ⓘNotable traits for CatchUnwind<Fut>
impl<Fut> Future for CatchUnwind<Fut> where
    Fut: Future + UnwindSafe,     type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send, Global>>; where
    Self: UnwindSafe,

Catches unwinding panics while polling the future. Read more

fn shared(self) -> Shared<Self>ⓘNotable traits for Shared<Fut>
impl<Fut> Future for Shared<Fut> where
    Fut: Future,
    <Fut as Future>::Output: Clone,     type Output = <Fut as Future>::Output; where
    Self::Output: Clone,

Create a cloneable handle to this future where all handles will resolve to the same result. Read more

fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)

Turn this future into a future that yields () on completion and sends its output to another future on a separate task. Read more

fn boxed<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>>ⓘNotable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output; where
    Self: Send + 'a,

Wrap the future in a Box, pinning it. Read more

fn boxed_local<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>ⓘNotable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output; where
    Self: 'a,

Wrap the future in a Box, pinning it. Read more

fn unit_error(self) -> UnitError<Self>ⓘNotable traits for UnitError<Fut>
impl<Fut> Future for UnitError<Fut> where
    Map<Fut, OkFn<()>>: Future,     type Output = <Map<Fut, OkFn<()>> as Future>::Output;

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = ()>. Read more

fn never_error(self) -> NeverError<Self>ⓘNotable traits for NeverError<Fut>
impl<Fut> Future for NeverError<Fut> where
    Map<Fut, OkFn<Infallible>>: Future,     type Output = <Map<Fut, OkFn<Infallible>> as Future>::Output;

Turns a Future<Output = T> into a TryFuture<Ok = T, Error = Never>. Read more

fn poll_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Self::Output> where
    Self: Unpin,

A convenience for calling Future::poll on Unpin future types.

fn now_or_never(self) -> Option<Self::Output>

Evaluates and consumes the future, returning the resulting output if the future is ready after the first call to Future::poll. Read more

impl<F> FutureExt for F where
    F: Future + ?Sized,

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

A convenience for calling Future::poll() on !Unpin types.

fn or<F>(self, other: F) -> Or<Self, F>ⓘNotable traits for Or<F1, F2>
impl<T, F1, F2> Future for Or<F1, F2> where
    F1: Future<Output = T>,
    F2: Future<Output = T>,     type Output = T; where
    F: Future<Output = Self::Output>,

Returns the result of self or other future, preferring self if both are ready. Read more

fn race<F>(self, other: F) -> Race<Self, F>ⓘNotable traits for Race<F1, F2>
impl<T, F1, F2> Future for Race<F1, F2> where
    F1: Future<Output = T>,
    F2: Future<Output = T>,     type Output = T; where
    F: Future<Output = Self::Output>,

Returns the result of self or other future, with no preference if both are ready. Read more

fn catch_unwind(self) -> CatchUnwind<Self>ⓘNotable traits for CatchUnwind<F>
impl<F> Future for CatchUnwind<F> where
    F: Future + UnwindSafe,     type Output = Result<<F as Future>::Output, Box<dyn Any + 'static + Send, Global>>; where
    Self: UnwindSafe,

Catches panics while polling the future. Read more

fn boxed<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send, Global>>ⓘNotable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output; where
    Self: Send + 'a,

Boxes the future and changes its type to dyn Future + Send + 'a. Read more

fn boxed_local<'a>(
    self
) -> Pin<Box<dyn Future<Output = Self::Output> + 'a, Global>>ⓘNotable traits for Pin<P>
impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,     type Output = <<P as Deref>::Target as Future>::Output; where
    Self: 'a,

Boxes the future and changes its type to dyn Future + 'a. Read more

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

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pub fn into(self) -> U[src]

Performs the conversion.

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

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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 Future = F

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

Which kind of future are we turning this into?

pub fn into_future(self) -> <F as IntoFuture>::Future[src]

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

Creates a future from a value.

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.

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

Performs the conversion.

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.

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

Performs the conversion.