1.36.0[−][src]Trait heim_common::prelude::Future
A future represents an asynchronous computation.
A future is a value that may not have finished computing yet. This kind of "asynchronous value" makes it possible for a thread to continue doing useful work while it waits for the value to become available.
The poll
method
The core method of future, poll
, attempts to resolve the future into a
final value. This method does not block if the value is not ready. Instead,
the current task is scheduled to be woken up when it's possible to make
further progress by poll
ing again. The context
passed to the poll
method can provide a Waker
, which is a handle for waking up the current
task.
When using a future, you generally won't call poll
directly, but instead
.await
the value.
Associated Types
Loading content...Required methods
#[lang = "poll"]pub fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>
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Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available.
Return value
This function returns:
Poll::Pending
if the future is not ready yetPoll::Ready(val)
with the resultval
of this future if it finished successfully.
Once a future has finished, clients should not poll
it again.
When a future is not ready yet, poll
returns Poll::Pending
and
stores a clone of the Waker
copied from the current Context
.
This Waker
is then woken once the future can make progress.
For example, a future waiting for a socket to become
readable would call .clone()
on the Waker
and store it.
When a signal arrives elsewhere indicating that the socket is readable,
Waker::wake
is called and the socket future's task is awoken.
Once a task has been woken up, it should attempt to poll
the future
again, which may or may not produce a final value.
Note that on multiple calls to poll
, only the Waker
from the
Context
passed to the most recent call should be scheduled to
receive a wakeup.
Runtime characteristics
Futures alone are inert; they must be actively poll
ed to make
progress, meaning that each time the current task is woken up, it should
actively re-poll
pending futures that it still has an interest in.
The poll
function is not called repeatedly in a tight loop -- instead,
it should only be called when the future indicates that it is ready to
make progress (by calling wake()
). If you're familiar with the
poll(2)
or select(2)
syscalls on Unix it's worth noting that futures
typically do not suffer the same problems of "all wakeups must poll
all events"; they are more like epoll(4)
.
An implementation of poll
should strive to return quickly, and should
not block. Returning quickly prevents unnecessarily clogging up
threads or event loops. If it is known ahead of time that a call to
poll
may end up taking awhile, the work should be offloaded to a
thread pool (or something similar) to ensure that poll
can return
quickly.
Panics
Once a future has completed (returned Ready
from poll
), calling its
poll
method again may panic, block forever, or cause other kinds of
problems; the Future
trait places no requirements on the effects of
such a call. However, as the poll
method is not marked unsafe
,
Rust's usual rules apply: calls must never cause undefined behavior
(memory corruption, incorrect use of unsafe
functions, or the like),
regardless of the future's state.
Trait Implementations
impl<'a, T> UnsafeFutureObj<'a, T> for &'a mut (dyn Future<Output = T> + 'a + Unpin)
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Implementations on Foreign Types
impl<F> Future for AssertUnwindSafe<F> where
F: Future,
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F: Future,
type Output = <F as Future>::Output
pub fn poll(
self: Pin<&mut AssertUnwindSafe<F>>,
cx: &mut Context<'_>
) -> Poll<<AssertUnwindSafe<F> as Future>::Output>
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self: Pin<&mut AssertUnwindSafe<F>>,
cx: &mut Context<'_>
) -> Poll<<AssertUnwindSafe<F> as Future>::Output>
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
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F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output
pub fn poll(
self: Pin<&mut &'_ mut F>,
cx: &mut Context<'_>
) -> Poll<<&'_ mut F as Future>::Output>
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self: Pin<&mut &'_ mut F>,
cx: &mut Context<'_>
) -> Poll<<&'_ mut F as Future>::Output>
impl<T> Future for Pending<T>
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impl<T, F> Future for PollFn<F> where
F: FnMut(&mut Context<'_>) -> Poll<T>,
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F: FnMut(&mut Context<'_>) -> Poll<T>,
impl<T> Future for Ready<T>
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impl<P> Future for Pin<P> where
P: Unpin + DerefMut,
<P as Deref>::Target: Future,
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P: Unpin + DerefMut,
<P as Deref>::Target: Future,
type Output = <<P as Deref>::Target as Future>::Output
pub fn poll(
self: Pin<&mut Pin<P>>,
cx: &mut Context<'_>
) -> Poll<<Pin<P> as Future>::Output>
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self: Pin<&mut Pin<P>>,
cx: &mut Context<'_>
) -> Poll<<Pin<P> as Future>::Output>
impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Unpin + Future + ?Sized,
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A: Allocator + 'static,
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output
pub fn poll(
self: Pin<&mut Box<F, A>>,
cx: &mut Context<'_>
) -> Poll<<Box<F, A> as Future>::Output>
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self: Pin<&mut Box<F, A>>,
cx: &mut Context<'_>
) -> Poll<<Box<F, A> as Future>::Output>
impl<'a, T> Future for MutexLockFuture<'a, T> where
T: ?Sized,
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T: ?Sized,
type Output = MutexGuard<'a, T>
pub fn poll(
self: Pin<&mut MutexLockFuture<'a, T>>,
cx: &mut Context<'_>
) -> Poll<<MutexLockFuture<'a, T> as Future>::Output>
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self: Pin<&mut MutexLockFuture<'a, T>>,
cx: &mut Context<'_>
) -> Poll<<MutexLockFuture<'a, T> as Future>::Output>
Implementors
impl<'_, St> Future for Next<'_, St> where
St: Unpin + Stream + ?Sized,
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St: Unpin + Stream + ?Sized,
type Output = Option<<St as Stream>::Item>
pub fn poll(
self: Pin<&mut Next<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<Next<'_, St> as Future>::Output>
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self: Pin<&mut Next<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<Next<'_, St> as Future>::Output>
impl<'_, St> Future for SelectNextSome<'_, St> where
St: Unpin + FusedStream + ?Sized,
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St: Unpin + FusedStream + ?Sized,
type Output = <St as Stream>::Item
pub fn poll(
self: Pin<&mut SelectNextSome<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<SelectNextSome<'_, St> as Future>::Output>
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self: Pin<&mut SelectNextSome<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<SelectNextSome<'_, St> as Future>::Output>
impl<'_, St> Future for TryNext<'_, St> where
St: Unpin + TryStream + ?Sized,
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St: Unpin + TryStream + ?Sized,
type Output = Result<Option<<St as TryStream>::Ok>, <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryNext<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<TryNext<'_, St> as Future>::Output>
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self: Pin<&mut TryNext<'_, St>>,
cx: &mut Context<'_>
) -> Poll<<TryNext<'_, St> as Future>::Output>
impl<'_, T> Future for FutureObj<'_, T>
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impl<'_, T> Future for LocalFutureObj<'_, T>
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type Output = T
pub fn poll(
self: Pin<&mut LocalFutureObj<'_, T>>,
cx: &mut Context<'_>
) -> Poll<T>
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self: Pin<&mut LocalFutureObj<'_, T>>,
cx: &mut Context<'_>
) -> Poll<T>
impl<'a, St> Future for Peek<'a, St> where
St: Stream,
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St: Stream,
type Output = Option<&'a <St as Stream>::Item>
pub fn poll(
self: Pin<&mut Peek<'a, St>>,
cx: &mut Context<'_>
) -> Poll<<Peek<'a, St> as Future>::Output>
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self: Pin<&mut Peek<'a, St>>,
cx: &mut Context<'_>
) -> Poll<<Peek<'a, St> as Future>::Output>
impl<A, B> Future for Either<A, B> where
A: Future,
B: Future<Output = <A as Future>::Output>,
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A: Future,
B: Future<Output = <A as Future>::Output>,
type Output = <A as Future>::Output
pub fn poll(
self: Pin<&mut Either<A, B>>,
cx: &mut Context<'_>
) -> Poll<<Either<A, B> as Future>::Output>
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self: Pin<&mut Either<A, B>>,
cx: &mut Context<'_>
) -> Poll<<Either<A, B> as Future>::Output>
impl<A, B> Future for Select<A, B> where
A: Future + Unpin,
B: Future + Unpin,
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A: Future + Unpin,
B: Future + Unpin,
type Output = Either<(<A as Future>::Output, B), (<B as Future>::Output, A)>
pub fn poll(
self: Pin<&mut Select<A, B>>,
cx: &mut Context<'_>
) -> Poll<<Select<A, B> as Future>::Output>
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self: Pin<&mut Select<A, B>>,
cx: &mut Context<'_>
) -> Poll<<Select<A, B> as Future>::Output>
impl<A, B> Future for TrySelect<A, B> where
A: Unpin + TryFuture,
B: Unpin + TryFuture,
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A: Unpin + TryFuture,
B: Unpin + TryFuture,
type Output = Result<Either<(<A as TryFuture>::Ok, B), (<B as TryFuture>::Ok, A)>, Either<(<A as TryFuture>::Error, B), (<B as TryFuture>::Error, A)>>
pub fn poll(
self: Pin<&mut TrySelect<A, B>>,
cx: &mut Context<'_>
) -> Poll<<TrySelect<A, B> as Future>::Output>
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self: Pin<&mut TrySelect<A, B>>,
cx: &mut Context<'_>
) -> Poll<<TrySelect<A, B> as Future>::Output>
impl<F> Future for Flatten<F> where
F: Future,
Flatten<F, <F as Future>::Output>: Future,
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F: Future,
Flatten<F, <F as Future>::Output>: Future,
type Output = <Flatten<F, <F as Future>::Output> as Future>::Output
pub fn poll(
self: Pin<&mut Flatten<F>>,
cx: &mut Context<'_>
) -> Poll<<Flatten<F> as Future>::Output>
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self: Pin<&mut Flatten<F>>,
cx: &mut Context<'_>
) -> Poll<<Flatten<F> as Future>::Output>
impl<F> Future for JoinAll<F> where
F: Future,
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F: Future,
type Output = Vec<<F as Future>::Output, Global>
pub fn poll(
self: Pin<&mut JoinAll<F>>,
cx: &mut Context<'_>
) -> Poll<<JoinAll<F> as Future>::Output>
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self: Pin<&mut JoinAll<F>>,
cx: &mut Context<'_>
) -> Poll<<JoinAll<F> as Future>::Output>
impl<F> Future for OptionFuture<F> where
F: Future,
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F: Future,
type Output = Option<<F as Future>::Output>
pub fn poll(
self: Pin<&mut OptionFuture<F>>,
cx: &mut Context<'_>
) -> Poll<<OptionFuture<F> as Future>::Output>
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self: Pin<&mut OptionFuture<F>>,
cx: &mut Context<'_>
) -> Poll<<OptionFuture<F> as Future>::Output>
impl<F> Future for TryJoinAll<F> where
F: TryFuture,
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F: TryFuture,
type Output = Result<Vec<<F as TryFuture>::Ok, Global>, <F as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryJoinAll<F>>,
cx: &mut Context<'_>
) -> Poll<<TryJoinAll<F> as Future>::Output>
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self: Pin<&mut TryJoinAll<F>>,
cx: &mut Context<'_>
) -> Poll<<TryJoinAll<F> as Future>::Output>
impl<F, R> Future for Lazy<F> where
F: FnOnce(&mut Context<'_>) -> R,
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F: FnOnce(&mut Context<'_>) -> R,
impl<Fut1, Fut2> Future for Join<Fut1, Fut2> where
Fut1: Future,
Fut2: Future,
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Fut1: Future,
Fut2: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output)
pub fn poll(
self: Pin<&mut Join<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<Join<Fut1, Fut2> as Future>::Output>
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self: Pin<&mut Join<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<Join<Fut1, Fut2> as Future>::Output>
impl<Fut1, Fut2> Future for TryFlatten<Fut1, Fut2> where
TryFlatten<Fut1, Fut2>: Future,
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TryFlatten<Fut1, Fut2>: Future,
type Output = <TryFlatten<Fut1, Fut2> as Future>::Output
pub fn poll(
self: Pin<&mut TryFlatten<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<TryFlatten<Fut1, Fut2> as Future>::Output>
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self: Pin<&mut TryFlatten<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<TryFlatten<Fut1, Fut2> as Future>::Output>
impl<Fut1, Fut2> Future for TryJoin<Fut1, Fut2> where
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
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Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryJoin<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin<Fut1, Fut2> as Future>::Output>
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self: Pin<&mut TryJoin<Fut1, Fut2>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin<Fut1, Fut2> as Future>::Output>
impl<Fut1, Fut2, F> Future for AndThen<Fut1, Fut2, F> where
TryFlatten<MapOk<Fut1, F>, Fut2>: Future,
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TryFlatten<MapOk<Fut1, F>, Fut2>: Future,
type Output = <TryFlatten<MapOk<Fut1, F>, Fut2> as Future>::Output
pub fn poll(
self: Pin<&mut AndThen<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<AndThen<Fut1, Fut2, F> as Future>::Output>
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self: Pin<&mut AndThen<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<AndThen<Fut1, Fut2, F> as Future>::Output>
impl<Fut1, Fut2, F> Future for OrElse<Fut1, Fut2, F> where
TryFlattenErr<MapErr<Fut1, F>, Fut2>: Future,
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TryFlattenErr<MapErr<Fut1, F>, Fut2>: Future,
type Output = <TryFlattenErr<MapErr<Fut1, F>, Fut2> as Future>::Output
pub fn poll(
self: Pin<&mut OrElse<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<OrElse<Fut1, Fut2, F> as Future>::Output>
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self: Pin<&mut OrElse<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<OrElse<Fut1, Fut2, F> as Future>::Output>
impl<Fut1, Fut2, F> Future for Then<Fut1, Fut2, F> where
Flatten<Map<Fut1, F>, Fut2>: Future,
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Flatten<Map<Fut1, F>, Fut2>: Future,
type Output = <Flatten<Map<Fut1, F>, Fut2> as Future>::Output
pub fn poll(
self: Pin<&mut Then<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<Then<Fut1, Fut2, F> as Future>::Output>
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self: Pin<&mut Then<Fut1, Fut2, F>>,
cx: &mut Context<'_>
) -> Poll<<Then<Fut1, Fut2, F> as Future>::Output>
impl<Fut1, Fut2, Fut3> Future for Join3<Fut1, Fut2, Fut3> where
Fut1: Future,
Fut2: Future,
Fut3: Future,
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Fut1: Future,
Fut2: Future,
Fut3: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <Fut3 as Future>::Output)
pub fn poll(
self: Pin<&mut Join3<Fut1, Fut2, Fut3>>,
cx: &mut Context<'_>
) -> Poll<<Join3<Fut1, Fut2, Fut3> as Future>::Output>
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self: Pin<&mut Join3<Fut1, Fut2, Fut3>>,
cx: &mut Context<'_>
) -> Poll<<Join3<Fut1, Fut2, Fut3> as Future>::Output>
impl<Fut1, Fut2, Fut3> Future for TryJoin3<Fut1, Fut2, Fut3> where
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
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Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok, <Fut3 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryJoin3<Fut1, Fut2, Fut3>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin3<Fut1, Fut2, Fut3> as Future>::Output>
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self: Pin<&mut TryJoin3<Fut1, Fut2, Fut3>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin3<Fut1, Fut2, Fut3> as Future>::Output>
impl<Fut1, Fut2, Fut3, Fut4> Future for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: Future,
Fut2: Future,
Fut3: Future,
Fut4: Future,
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Fut1: Future,
Fut2: Future,
Fut3: Future,
Fut4: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <Fut3 as Future>::Output, <Fut4 as Future>::Output)
pub fn poll(
self: Pin<&mut Join4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context<'_>
) -> Poll<<Join4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
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self: Pin<&mut Join4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context<'_>
) -> Poll<<Join4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
impl<Fut1, Fut2, Fut3, Fut4> Future for TryJoin4<Fut1, Fut2, Fut3, Fut4> where
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut4: TryFuture<Error = <Fut1 as TryFuture>::Error>,
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Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut4: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok, <Fut3 as TryFuture>::Ok, <Fut4 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryJoin4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
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self: Pin<&mut TryJoin4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
impl<Fut1, Fut2, Fut3, Fut4, Fut5> Future for Join5<Fut1, Fut2, Fut3, Fut4, Fut5> where
Fut1: Future,
Fut2: Future,
Fut3: Future,
Fut4: Future,
Fut5: Future,
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Fut1: Future,
Fut2: Future,
Fut3: Future,
Fut4: Future,
Fut5: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <Fut3 as Future>::Output, <Fut4 as Future>::Output, <Fut5 as Future>::Output)
pub fn poll(
self: Pin<&mut Join5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context<'_>
) -> Poll<<Join5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
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self: Pin<&mut Join5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context<'_>
) -> Poll<<Join5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
impl<Fut1, Fut2, Fut3, Fut4, Fut5> Future for TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5> where
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut4: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut5: TryFuture<Error = <Fut1 as TryFuture>::Error>,
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Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut3: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut4: TryFuture<Error = <Fut1 as TryFuture>::Error>,
Fut5: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok, <Fut3 as TryFuture>::Ok, <Fut4 as TryFuture>::Ok, <Fut5 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
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self: Pin<&mut TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context<'_>
) -> Poll<<TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
impl<Fut> Future for MaybeDone<Fut> where
Fut: Future,
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Fut: Future,
type Output = ()
pub fn poll(
self: Pin<&mut MaybeDone<Fut>>,
cx: &mut Context<'_>
) -> Poll<<MaybeDone<Fut> as Future>::Output>
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self: Pin<&mut MaybeDone<Fut>>,
cx: &mut Context<'_>
) -> Poll<<MaybeDone<Fut> as Future>::Output>
impl<Fut> Future for TryMaybeDone<Fut> where
Fut: TryFuture,
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Fut: TryFuture,
type Output = Result<(), <Fut as TryFuture>::Error>
pub fn poll(
self: Pin<&mut TryMaybeDone<Fut>>,
cx: &mut Context<'_>
) -> Poll<<TryMaybeDone<Fut> as Future>::Output>
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self: Pin<&mut TryMaybeDone<Fut>>,
cx: &mut Context<'_>
) -> Poll<<TryMaybeDone<Fut> as Future>::Output>
impl<Fut> Future for Abortable<Fut> where
Fut: Future,
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Fut: Future,
type Output = Result<<Fut as Future>::Output, Aborted>
pub fn poll(
self: Pin<&mut Abortable<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Abortable<Fut> as Future>::Output>
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self: Pin<&mut Abortable<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Abortable<Fut> as Future>::Output>
impl<Fut> Future for CatchUnwind<Fut> where
Fut: Future + UnwindSafe,
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Fut: Future + UnwindSafe,
type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send, Global>>
pub fn poll(
self: Pin<&mut CatchUnwind<Fut>>,
cx: &mut Context<'_>
) -> Poll<<CatchUnwind<Fut> as Future>::Output>
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self: Pin<&mut CatchUnwind<Fut>>,
cx: &mut Context<'_>
) -> Poll<<CatchUnwind<Fut> as Future>::Output>
impl<Fut> Future for Fuse<Fut> where
Fut: Future,
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Fut: Future,
type Output = <Fut as Future>::Output
pub fn poll(
self: Pin<&mut Fuse<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Fut as Future>::Output>
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self: Pin<&mut Fuse<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Fut as Future>::Output>
impl<Fut> Future for IntoFuture<Fut> where
Fut: TryFuture,
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Fut: TryFuture,
type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>
pub fn poll(
self: Pin<&mut IntoFuture<Fut>>,
cx: &mut Context<'_>
) -> Poll<<IntoFuture<Fut> as Future>::Output>
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self: Pin<&mut IntoFuture<Fut>>,
cx: &mut Context<'_>
) -> Poll<<IntoFuture<Fut> as Future>::Output>
impl<Fut> Future for NeverError<Fut> where
Map<Fut, OkFn<Infallible>>: Future,
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Map<Fut, OkFn<Infallible>>: Future,
type Output = <Map<Fut, OkFn<Infallible>> as Future>::Output
pub fn poll(
self: Pin<&mut NeverError<Fut>>,
cx: &mut Context<'_>
) -> Poll<<NeverError<Fut> as Future>::Output>
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self: Pin<&mut NeverError<Fut>>,
cx: &mut Context<'_>
) -> Poll<<NeverError<Fut> as Future>::Output>
impl<Fut> Future for SelectAll<Fut> where
Fut: Unpin + Future,
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Fut: Unpin + Future,
type Output = (<Fut as Future>::Output, usize, Vec<Fut, Global>)
pub fn poll(
self: Pin<&mut SelectAll<Fut>>,
cx: &mut Context<'_>
) -> Poll<<SelectAll<Fut> as Future>::Output>
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self: Pin<&mut SelectAll<Fut>>,
cx: &mut Context<'_>
) -> Poll<<SelectAll<Fut> as Future>::Output>
impl<Fut> Future for SelectOk<Fut> where
Fut: Unpin + TryFuture,
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Fut: Unpin + TryFuture,
type Output = Result<(<Fut as TryFuture>::Ok, Vec<Fut, Global>), <Fut as TryFuture>::Error>
pub fn poll(
self: Pin<&mut SelectOk<Fut>>,
cx: &mut Context<'_>
) -> Poll<<SelectOk<Fut> as Future>::Output>
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self: Pin<&mut SelectOk<Fut>>,
cx: &mut Context<'_>
) -> Poll<<SelectOk<Fut> as Future>::Output>
impl<Fut> Future for Shared<Fut> where
Fut: Future,
<Fut as Future>::Output: Clone,
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Fut: Future,
<Fut as Future>::Output: Clone,
type Output = <Fut as Future>::Output
pub fn poll(
self: Pin<&mut Shared<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Shared<Fut> as Future>::Output>
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self: Pin<&mut Shared<Fut>>,
cx: &mut Context<'_>
) -> Poll<<Shared<Fut> as Future>::Output>
impl<Fut> Future for UnitError<Fut> where
Map<Fut, OkFn<()>>: Future,
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Map<Fut, OkFn<()>>: Future,
type Output = <Map<Fut, OkFn<()>> as Future>::Output
pub fn poll(
self: Pin<&mut UnitError<Fut>>,
cx: &mut Context<'_>
) -> Poll<<UnitError<Fut> as Future>::Output>
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self: Pin<&mut UnitError<Fut>>,
cx: &mut Context<'_>
) -> Poll<<UnitError<Fut> as Future>::Output>
impl<Fut, E> Future for ErrInto<Fut, E> where
MapErr<Fut, IntoFn<E>>: Future,
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MapErr<Fut, IntoFn<E>>: Future,
type Output = <MapErr<Fut, IntoFn<E>> as Future>::Output
pub fn poll(
self: Pin<&mut ErrInto<Fut, E>>,
cx: &mut Context<'_>
) -> Poll<<ErrInto<Fut, E> as Future>::Output>
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self: Pin<&mut ErrInto<Fut, E>>,
cx: &mut Context<'_>
) -> Poll<<ErrInto<Fut, E> as Future>::Output>
impl<Fut, E> Future for OkInto<Fut, E> where
MapOk<Fut, IntoFn<E>>: Future,
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MapOk<Fut, IntoFn<E>>: Future,
type Output = <MapOk<Fut, IntoFn<E>> as Future>::Output
pub fn poll(
self: Pin<&mut OkInto<Fut, E>>,
cx: &mut Context<'_>
) -> Poll<<OkInto<Fut, E> as Future>::Output>
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self: Pin<&mut OkInto<Fut, E>>,
cx: &mut Context<'_>
) -> Poll<<OkInto<Fut, E> as Future>::Output>
impl<Fut, F> Future for Inspect<Fut, F> where
Map<Fut, InspectFn<F>>: Future,
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Map<Fut, InspectFn<F>>: Future,
type Output = <Map<Fut, InspectFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut Inspect<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<Inspect<Fut, F> as Future>::Output>
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self: Pin<&mut Inspect<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<Inspect<Fut, F> as Future>::Output>
impl<Fut, F> Future for InspectErr<Fut, F> where
Inspect<IntoFuture<Fut>, InspectErrFn<F>>: Future,
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Inspect<IntoFuture<Fut>, InspectErrFn<F>>: Future,
type Output = <Inspect<IntoFuture<Fut>, InspectErrFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut InspectErr<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<InspectErr<Fut, F> as Future>::Output>
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self: Pin<&mut InspectErr<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<InspectErr<Fut, F> as Future>::Output>
impl<Fut, F> Future for InspectOk<Fut, F> where
Inspect<IntoFuture<Fut>, InspectOkFn<F>>: Future,
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Inspect<IntoFuture<Fut>, InspectOkFn<F>>: Future,
type Output = <Inspect<IntoFuture<Fut>, InspectOkFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut InspectOk<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<InspectOk<Fut, F> as Future>::Output>
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self: Pin<&mut InspectOk<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<InspectOk<Fut, F> as Future>::Output>
impl<Fut, F> Future for Map<Fut, F> where
Map<Fut, F>: Future,
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Map<Fut, F>: Future,
type Output = <Map<Fut, F> as Future>::Output
pub fn poll(
self: Pin<&mut Map<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<Map<Fut, F> as Future>::Output>
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self: Pin<&mut Map<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<Map<Fut, F> as Future>::Output>
impl<Fut, F> Future for MapErr<Fut, F> where
Map<IntoFuture<Fut>, MapErrFn<F>>: Future,
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Map<IntoFuture<Fut>, MapErrFn<F>>: Future,
type Output = <Map<IntoFuture<Fut>, MapErrFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut MapErr<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<MapErr<Fut, F> as Future>::Output>
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self: Pin<&mut MapErr<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<MapErr<Fut, F> as Future>::Output>
impl<Fut, F> Future for MapOk<Fut, F> where
Map<IntoFuture<Fut>, MapOkFn<F>>: Future,
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Map<IntoFuture<Fut>, MapOkFn<F>>: Future,
type Output = <Map<IntoFuture<Fut>, MapOkFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut MapOk<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<MapOk<Fut, F> as Future>::Output>
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self: Pin<&mut MapOk<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<MapOk<Fut, F> as Future>::Output>
impl<Fut, F> Future for UnwrapOrElse<Fut, F> where
Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Future,
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Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Future,
type Output = <Map<IntoFuture<Fut>, UnwrapOrElseFn<F>> as Future>::Output
pub fn poll(
self: Pin<&mut UnwrapOrElse<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<UnwrapOrElse<Fut, F> as Future>::Output>
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self: Pin<&mut UnwrapOrElse<Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<UnwrapOrElse<Fut, F> as Future>::Output>
impl<Fut, F, G> Future for MapOkOrElse<Fut, F, G> where
Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>>: Future,
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Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>>: Future,
type Output = <Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>> as Future>::Output
pub fn poll(
self: Pin<&mut MapOkOrElse<Fut, F, G>>,
cx: &mut Context<'_>
) -> Poll<<MapOkOrElse<Fut, F, G> as Future>::Output>
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self: Pin<&mut MapOkOrElse<Fut, F, G>>,
cx: &mut Context<'_>
) -> Poll<<MapOkOrElse<Fut, F, G> as Future>::Output>
impl<Fut, T> Future for MapInto<Fut, T> where
Map<Fut, IntoFn<T>>: Future,
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Map<Fut, IntoFn<T>>: Future,
type Output = <Map<Fut, IntoFn<T>> as Future>::Output
pub fn poll(
self: Pin<&mut MapInto<Fut, T>>,
cx: &mut Context<'_>
) -> Poll<<MapInto<Fut, T> as Future>::Output>
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self: Pin<&mut MapInto<Fut, T>>,
cx: &mut Context<'_>
) -> Poll<<MapInto<Fut, T> as Future>::Output>
impl<St> Future for Concat<St> where
St: Stream,
<St as Stream>::Item: Extend<<<St as Stream>::Item as IntoIterator>::Item>,
<St as Stream>::Item: IntoIterator,
<St as Stream>::Item: Default,
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St: Stream,
<St as Stream>::Item: Extend<<<St as Stream>::Item as IntoIterator>::Item>,
<St as Stream>::Item: IntoIterator,
<St as Stream>::Item: Default,
type Output = <St as Stream>::Item
pub fn poll(
self: Pin<&mut Concat<St>>,
cx: &mut Context<'_>
) -> Poll<<Concat<St> as Future>::Output>
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self: Pin<&mut Concat<St>>,
cx: &mut Context<'_>
) -> Poll<<Concat<St> as Future>::Output>
impl<St> Future for StreamFuture<St> where
St: Unpin + Stream,
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St: Unpin + Stream,
type Output = (Option<<St as Stream>::Item>, St)
pub fn poll(
self: Pin<&mut StreamFuture<St>>,
cx: &mut Context<'_>
) -> Poll<<StreamFuture<St> as Future>::Output>
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self: Pin<&mut StreamFuture<St>>,
cx: &mut Context<'_>
) -> Poll<<StreamFuture<St> as Future>::Output>
impl<St> Future for TryConcat<St> where
St: TryStream,
<St as TryStream>::Ok: Extend<<<St as TryStream>::Ok as IntoIterator>::Item>,
<St as TryStream>::Ok: IntoIterator,
<St as TryStream>::Ok: Default,
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St: TryStream,
<St as TryStream>::Ok: Extend<<<St as TryStream>::Ok as IntoIterator>::Item>,
<St as TryStream>::Ok: IntoIterator,
<St as TryStream>::Ok: Default,
type Output = Result<<St as TryStream>::Ok, <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryConcat<St>>,
cx: &mut Context<'_>
) -> Poll<<TryConcat<St> as Future>::Output>
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self: Pin<&mut TryConcat<St>>,
cx: &mut Context<'_>
) -> Poll<<TryConcat<St> as Future>::Output>
impl<St, C> Future for Collect<St, C> where
C: Default + Extend<<St as Stream>::Item>,
St: Stream,
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C: Default + Extend<<St as Stream>::Item>,
St: Stream,
impl<St, C> Future for TryCollect<St, C> where
C: Default + Extend<<St as TryStream>::Ok>,
St: TryStream,
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C: Default + Extend<<St as TryStream>::Ok>,
St: TryStream,
type Output = Result<C, <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryCollect<St, C>>,
cx: &mut Context<'_>
) -> Poll<<TryCollect<St, C> as Future>::Output>
[src]
self: Pin<&mut TryCollect<St, C>>,
cx: &mut Context<'_>
) -> Poll<<TryCollect<St, C> as Future>::Output>
impl<St, Fut, F> Future for ForEach<St, Fut, F> where
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
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F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
type Output = ()
pub fn poll(
self: Pin<&mut ForEach<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<()>
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self: Pin<&mut ForEach<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<()>
impl<St, Fut, F> Future for ForEachConcurrent<St, Fut, F> where
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
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F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
type Output = ()
pub fn poll(
self: Pin<&mut ForEachConcurrent<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<()>
[src]
self: Pin<&mut ForEachConcurrent<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<()>
impl<St, Fut, F> Future for TryForEach<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = <St as TryStream>::Error>,
St: TryStream,
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F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = <St as TryStream>::Error>,
St: TryStream,
type Output = Result<(), <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryForEach<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<TryForEach<St, Fut, F> as Future>::Output>
[src]
self: Pin<&mut TryForEach<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<TryForEach<St, Fut, F> as Future>::Output>
impl<St, Fut, F> Future for TryForEachConcurrent<St, Fut, F> where
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: Future<Output = Result<(), <St as TryStream>::Error>>,
St: TryStream,
[src]
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: Future<Output = Result<(), <St as TryStream>::Error>>,
St: TryStream,
type Output = Result<(), <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryForEachConcurrent<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<TryForEachConcurrent<St, Fut, F> as Future>::Output>
[src]
self: Pin<&mut TryForEachConcurrent<St, Fut, F>>,
cx: &mut Context<'_>
) -> Poll<<TryForEachConcurrent<St, Fut, F> as Future>::Output>
impl<St, Fut, T, F> Future for Fold<St, Fut, T, F> where
F: FnMut(T, <St as Stream>::Item) -> Fut,
Fut: Future<Output = T>,
St: Stream,
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F: FnMut(T, <St as Stream>::Item) -> Fut,
Fut: Future<Output = T>,
St: Stream,
type Output = T
pub fn poll(
self: Pin<&mut Fold<St, Fut, T, F>>,
cx: &mut Context<'_>
) -> Poll<T>
[src]
self: Pin<&mut Fold<St, Fut, T, F>>,
cx: &mut Context<'_>
) -> Poll<T>
impl<St, Fut, T, F> Future for TryFold<St, Fut, T, F> where
F: FnMut(T, <St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = <St as TryStream>::Error>,
St: TryStream,
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F: FnMut(T, <St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = <St as TryStream>::Error>,
St: TryStream,
type Output = Result<T, <St as TryStream>::Error>
pub fn poll(
self: Pin<&mut TryFold<St, Fut, T, F>>,
cx: &mut Context<'_>
) -> Poll<<TryFold<St, Fut, T, F> as Future>::Output>
[src]
self: Pin<&mut TryFold<St, Fut, T, F>>,
cx: &mut Context<'_>
) -> Poll<<TryFold<St, Fut, T, F> as Future>::Output>
impl<T> Future for heim_common::prelude::futures::future::Pending<T>
[src]
impl<T> Future for heim_common::prelude::futures::future::Ready<T>
[src]
impl<T, F> Future for heim_common::prelude::futures::future::PollFn<F> where
F: FnMut(&mut Context<'_>) -> Poll<T>,
[src]
F: FnMut(&mut Context<'_>) -> Poll<T>,