[−][src]Trait futures::prelude::Future
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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 wake up is performed using
the waker
argument of the poll()
method, 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
type Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
The type of value produced on completion.
Required methods
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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 most recent
Waker
passed to poll
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.
An implementation of poll
may also never cause memory unsafety.
Panics
Once a future has completed (returned Ready
from poll
),
then any future calls to poll
may panic, block forever, or otherwise
cause any kind of bad behavior except causing memory unsafety.
The Future
trait itself provides no guarantees about the behavior
of poll
after a future has completed.
Implementations on Foreign Types
impl<F> Future for AssertUnwindSafe<F> where
F: Future,
[src]
F: Future,
type Output = <F as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut AssertUnwindSafe<F>>,
cx: &mut Context
) -> Poll<<AssertUnwindSafe<F> as Future>::Output>
[src]
self: Pin<&mut AssertUnwindSafe<F>>,
cx: &mut Context
) -> Poll<<AssertUnwindSafe<F> as Future>::Output>
impl<P> Future for Pin<P> where
P: Unpin + DerefMut,
<P as Deref>::Target: Future,
[src]
P: Unpin + DerefMut,
<P as Deref>::Target: Future,
type Output = <<P as Deref>::Target as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Pin<P>>,
cx: &mut Context
) -> Poll<<Pin<P> as Future>::Output>
[src]
self: Pin<&mut Pin<P>>,
cx: &mut Context
) -> Poll<<Pin<P> as Future>::Output>
impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized,
[src]
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut &'_ mut F>,
cx: &mut Context
) -> Poll<<&'_ mut F as Future>::Output>
[src]
self: Pin<&mut &'_ mut F>,
cx: &mut Context
) -> Poll<<&'_ mut F as Future>::Output>
impl<F> Future for Box<F> where
F: Unpin + Future + ?Sized,
[src]
F: Unpin + Future + ?Sized,
type Output = <F as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Box<F>>,
cx: &mut Context
) -> Poll<<Box<F> as Future>::Output>
[src]
self: Pin<&mut Box<F>>,
cx: &mut Context
) -> Poll<<Box<F> 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,
[src]
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryConcat<St>>,
cx: &mut Context
) -> Poll<<TryConcat<St> as Future>::Output>
[src]
self: Pin<&mut TryConcat<St>>,
cx: &mut Context
) -> Poll<<TryConcat<St> as Future>::Output>
impl<'a, T> Future for BiLockAcquire<'a, T>
[src]
type Output = BiLockGuard<'a, T>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut BiLockAcquire<'a, T>>,
cx: &mut Context
) -> Poll<<BiLockAcquire<'a, T> as Future>::Output>
[src]
self: Pin<&mut BiLockAcquire<'a, T>>,
cx: &mut Context
) -> Poll<<BiLockAcquire<'a, T> as Future>::Output>
impl<Fut, T> Future for UnitError<Fut> where
Fut: Future<Output = T>,
[src]
Fut: Future<Output = T>,
type Output = Result<T, ()>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut UnitError<Fut>>, cx: &mut Context) -> Poll<Result<T, ()>>
[src]
Implementors
impl<'_, A> Future for ReadToEnd<'_, A> where
A: AsyncRead + Unpin + ?Sized,
[src]
A: AsyncRead + Unpin + ?Sized,
type Output = Result<(), Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut ReadToEnd<'_, A>>,
cx: &mut Context
) -> Poll<<ReadToEnd<'_, A> as Future>::Output>
[src]
self: Pin<&mut ReadToEnd<'_, A>>,
cx: &mut Context
) -> Poll<<ReadToEnd<'_, A> as Future>::Output>
impl<'_, R> Future for Read<'_, R> where
R: Unpin + AsyncRead + ?Sized,
[src]
R: Unpin + AsyncRead + ?Sized,
type Output = Result<usize, Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Read<'_, R>>,
cx: &mut Context
) -> Poll<<Read<'_, R> as Future>::Output>
[src]
self: Pin<&mut Read<'_, R>>,
cx: &mut Context
) -> Poll<<Read<'_, R> as Future>::Output>
impl<'_, R> Future for ReadExact<'_, R> where
R: Unpin + AsyncRead + ?Sized,
[src]
R: Unpin + AsyncRead + ?Sized,
type Output = Result<(), Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut ReadExact<'_, R>>,
cx: &mut Context
) -> Poll<<ReadExact<'_, R> as Future>::Output>
[src]
self: Pin<&mut ReadExact<'_, R>>,
cx: &mut Context
) -> Poll<<ReadExact<'_, R> as Future>::Output>
impl<'_, R, W> Future for CopyInto<'_, R, W> where
R: AsyncRead + Unpin + ?Sized,
W: AsyncWrite + Unpin + ?Sized,
[src]
R: AsyncRead + Unpin + ?Sized,
W: AsyncWrite + Unpin + ?Sized,
type Output = Result<u64, Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut CopyInto<'_, R, W>>,
cx: &mut Context
) -> Poll<<CopyInto<'_, R, W> as Future>::Output>
[src]
self: Pin<&mut CopyInto<'_, R, W>>,
cx: &mut Context
) -> Poll<<CopyInto<'_, R, W> as Future>::Output>
impl<'_, Si, Item> Future for futures::sink::Close<'_, Si, Item> where
Si: Unpin + Sink<Item> + ?Sized,
[src]
Si: Unpin + Sink<Item> + ?Sized,
type Output = Result<(), <Si as Sink<Item>>::SinkError>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Close<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Close<'_, Si, Item> as Future>::Output>
[src]
self: Pin<&mut Close<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Close<'_, Si, Item> as Future>::Output>
impl<'_, Si, Item> Future for futures::sink::Flush<'_, Si, Item> where
Si: Unpin + Sink<Item> + ?Sized,
[src]
Si: Unpin + Sink<Item> + ?Sized,
type Output = Result<(), <Si as Sink<Item>>::SinkError>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Flush<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Flush<'_, Si, Item> as Future>::Output>
[src]
self: Pin<&mut Flush<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Flush<'_, Si, Item> as Future>::Output>
impl<'_, Si, Item> Future for Send<'_, Si, Item> where
Si: Unpin + Sink<Item> + ?Sized,
[src]
Si: Unpin + Sink<Item> + ?Sized,
type Output = Result<(), <Si as Sink<Item>>::SinkError>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Send<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Send<'_, Si, Item> as Future>::Output>
[src]
self: Pin<&mut Send<'_, Si, Item>>,
cx: &mut Context
) -> Poll<<Send<'_, Si, Item> as Future>::Output>
impl<'_, Si, St> Future for SendAll<'_, Si, St> where
Si: Sink<<St as Stream>::Item> + Unpin + ?Sized,
St: Stream + Unpin + ?Sized,
[src]
Si: Sink<<St as Stream>::Item> + Unpin + ?Sized,
St: Stream + Unpin + ?Sized,
type Output = Result<(), <Si as Sink<<St as Stream>::Item>>::SinkError>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut SendAll<'_, Si, St>>,
cx: &mut Context
) -> Poll<<SendAll<'_, Si, St> as Future>::Output>
[src]
self: Pin<&mut SendAll<'_, Si, St>>,
cx: &mut Context
) -> Poll<<SendAll<'_, Si, St> as Future>::Output>
impl<'_, St> Future for Next<'_, St> where
St: Unpin + Stream,
[src]
St: Unpin + Stream,
type Output = Option<<St as Stream>::Item>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Next<'_, St>>,
cx: &mut Context
) -> Poll<<Next<'_, St> as Future>::Output>
[src]
self: Pin<&mut Next<'_, St>>,
cx: &mut Context
) -> Poll<<Next<'_, St> as Future>::Output>
impl<'_, St> Future for TryNext<'_, St> where
St: Unpin + TryStream,
[src]
St: Unpin + TryStream,
type Output = Result<Option<<St as TryStream>::Ok>, <St as TryStream>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryNext<'_, St>>,
cx: &mut Context
) -> Poll<<TryNext<'_, St> as Future>::Output>
[src]
self: Pin<&mut TryNext<'_, St>>,
cx: &mut Context
) -> Poll<<TryNext<'_, St> as Future>::Output>
impl<'_, W> Future for futures::io::Close<'_, W> where
W: Unpin + AsyncWrite + ?Sized,
[src]
W: Unpin + AsyncWrite + ?Sized,
type Output = Result<(), Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Close<'_, W>>,
cx: &mut Context
) -> Poll<<Close<'_, W> as Future>::Output>
[src]
self: Pin<&mut Close<'_, W>>,
cx: &mut Context
) -> Poll<<Close<'_, W> as Future>::Output>
impl<'_, W> Future for futures::io::Flush<'_, W> where
W: AsyncWrite + Unpin + ?Sized,
[src]
W: AsyncWrite + Unpin + ?Sized,
type Output = Result<(), Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Flush<'_, W>>,
cx: &mut Context
) -> Poll<<Flush<'_, W> as Future>::Output>
[src]
self: Pin<&mut Flush<'_, W>>,
cx: &mut Context
) -> Poll<<Flush<'_, W> as Future>::Output>
impl<'_, W> Future for WriteAll<'_, W> where
W: Unpin + AsyncWrite + ?Sized,
[src]
W: Unpin + AsyncWrite + ?Sized,
type Output = Result<(), Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut WriteAll<'_, W>>,
cx: &mut Context
) -> Poll<Result<(), Error>>
[src]
self: Pin<&mut WriteAll<'_, W>>,
cx: &mut Context
) -> Poll<Result<(), Error>>
impl<'a, St> Future for SelectNextSome<'a, St> where
St: Unpin + Stream + FusedStream,
[src]
St: Unpin + Stream + FusedStream,
type Output = <St as Stream>::Item
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut SelectNextSome<'a, St>>,
cx: &mut Context
) -> Poll<<SelectNextSome<'a, St> as Future>::Output>
[src]
self: Pin<&mut SelectNextSome<'a, St>>,
cx: &mut Context
) -> Poll<<SelectNextSome<'a, St> as Future>::Output>
impl<'a, T> Future for FutureObj<'a, T>
[src]
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut FutureObj<'a, T>>, cx: &mut Context) -> Poll<T>
[src]
impl<'a, T> Future for LocalFutureObj<'a, T>
[src]
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut LocalFutureObj<'a, T>>, cx: &mut Context) -> Poll<T>
[src]
impl<'a, T> Future for MutexLockFuture<'a, T>
[src]
type Output = MutexGuard<'a, T>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut MutexLockFuture<'a, T>>,
cx: &mut Context
) -> Poll<<MutexLockFuture<'a, T> as Future>::Output>
[src]
self: Pin<&mut MutexLockFuture<'a, T>>,
cx: &mut Context
) -> Poll<<MutexLockFuture<'a, T> as Future>::Output>
impl<F> Future for JoinAll<F> where
F: Future,
[src]
F: Future,
type Output = Vec<<F as Future>::Output>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut JoinAll<F>>,
cx: &mut Context
) -> Poll<<JoinAll<F> as Future>::Output>
[src]
self: Pin<&mut JoinAll<F>>,
cx: &mut Context
) -> Poll<<JoinAll<F> as Future>::Output>
impl<F> Future for OptionFuture<F> where
F: Future,
[src]
F: Future,
type Output = Option<<F as Future>::Output>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut OptionFuture<F>>,
cx: &mut Context
) -> Poll<<OptionFuture<F> as Future>::Output>
[src]
self: Pin<&mut OptionFuture<F>>,
cx: &mut Context
) -> Poll<<OptionFuture<F> as Future>::Output>
impl<F> Future for TryJoinAll<F> where
F: TryFuture,
[src]
F: TryFuture,
type Output = Result<Vec<<F as TryFuture>::Ok>, <F as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryJoinAll<F>>,
cx: &mut Context
) -> Poll<<TryJoinAll<F> as Future>::Output>
[src]
self: Pin<&mut TryJoinAll<F>>,
cx: &mut Context
) -> Poll<<TryJoinAll<F> as Future>::Output>
impl<Fut> Future for MaybeDone<Fut> where
Fut: Future,
[src]
Fut: Future,
type Output = ()
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut MaybeDone<Fut>>,
cx: &mut Context
) -> Poll<<MaybeDone<Fut> as Future>::Output>
[src]
self: Pin<&mut MaybeDone<Fut>>,
cx: &mut Context
) -> Poll<<MaybeDone<Fut> as Future>::Output>
impl<Fut> Future for Compat01As03<Fut> where
Fut: Future,
[src]
Fut: Future,
type Output = Result<<Fut as Future>::Item, <Fut as Future>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Compat01As03<Fut>>,
cx: &mut Context
) -> Poll<<Compat01As03<Fut> as Future>::Output>
[src]
self: Pin<&mut Compat01As03<Fut>>,
cx: &mut Context
) -> Poll<<Compat01As03<Fut> as Future>::Output>
impl<Fut> Future for Abortable<Fut> where
Fut: Future,
[src]
Fut: Future,
type Output = Result<<Fut as Future>::Output, Aborted>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Abortable<Fut>>,
cx: &mut Context
) -> Poll<<Abortable<Fut> as Future>::Output>
[src]
self: Pin<&mut Abortable<Fut>>,
cx: &mut Context
) -> Poll<<Abortable<Fut> as Future>::Output>
impl<Fut> Future for CatchUnwind<Fut> where
Fut: Future + UnwindSafe,
[src]
Fut: Future + UnwindSafe,
type Output = Result<<Fut as Future>::Output, Box<dyn Any + 'static + Send>>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut CatchUnwind<Fut>>,
cx: &mut Context
) -> Poll<<CatchUnwind<Fut> as Future>::Output>
[src]
self: Pin<&mut CatchUnwind<Fut>>,
cx: &mut Context
) -> Poll<<CatchUnwind<Fut> as Future>::Output>
impl<Fut> Future for Flatten<Fut> where
Fut: Future,
<Fut as Future>::Output: Future,
[src]
Fut: Future,
<Fut as Future>::Output: Future,
type Output = <<Fut as Future>::Output as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Flatten<Fut>>,
cx: &mut Context
) -> Poll<<Flatten<Fut> as Future>::Output>
[src]
self: Pin<&mut Flatten<Fut>>,
cx: &mut Context
) -> Poll<<Flatten<Fut> as Future>::Output>
impl<Fut> Future for Fuse<Fut> where
Fut: Future,
[src]
Fut: Future,
type Output = <Fut as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Fuse<Fut>>,
cx: &mut Context
) -> Poll<<Fut as Future>::Output>
[src]
self: Pin<&mut Fuse<Fut>>,
cx: &mut Context
) -> Poll<<Fut as Future>::Output>
impl<Fut> Future for IntoFuture<Fut> where
Fut: TryFuture,
[src]
Fut: TryFuture,
type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut IntoFuture<Fut>>,
cx: &mut Context
) -> Poll<<IntoFuture<Fut> as Future>::Output>
[src]
self: Pin<&mut IntoFuture<Fut>>,
cx: &mut Context
) -> Poll<<IntoFuture<Fut> as Future>::Output>
impl<Fut> Future for Remote<Fut> where
Fut: Future,
[src]
Fut: Future,
type Output = ()
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Remote<Fut>>, cx: &mut Context) -> Poll<()>
[src]
impl<Fut> Future for Shared<Fut> where
Fut: Future,
<Fut as Future>::Output: Clone,
[src]
Fut: Future,
<Fut as Future>::Output: Clone,
type Output = <Fut as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Shared<Fut>>,
cx: &mut Context
) -> Poll<<Shared<Fut> as Future>::Output>
[src]
self: Pin<&mut Shared<Fut>>,
cx: &mut Context
) -> Poll<<Shared<Fut> as Future>::Output>
impl<Fut, E> Future for ErrInto<Fut, E> where
Fut: TryFuture,
<Fut as TryFuture>::Error: Into<E>,
[src]
Fut: TryFuture,
<Fut as TryFuture>::Error: Into<E>,
type Output = Result<<Fut as TryFuture>::Ok, E>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut ErrInto<Fut, E>>,
cx: &mut Context
) -> Poll<<ErrInto<Fut, E> as Future>::Output>
[src]
self: Pin<&mut ErrInto<Fut, E>>,
cx: &mut Context
) -> Poll<<ErrInto<Fut, E> as Future>::Output>
impl<Fut, F> Future for Inspect<Fut, F> where
F: FnOnce(&<Fut as Future>::Output),
Fut: Future,
[src]
F: FnOnce(&<Fut as Future>::Output),
Fut: Future,
type Output = <Fut as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Inspect<Fut, F>>,
cx: &mut Context
) -> Poll<<Fut as Future>::Output>
[src]
self: Pin<&mut Inspect<Fut, F>>,
cx: &mut Context
) -> Poll<<Fut as Future>::Output>
impl<Fut, F> Future for UnwrapOrElse<Fut, F> where
F: FnOnce(<Fut as TryFuture>::Error) -> <Fut as TryFuture>::Ok,
Fut: TryFuture,
[src]
F: FnOnce(<Fut as TryFuture>::Error) -> <Fut as TryFuture>::Ok,
Fut: TryFuture,
type Output = <Fut as TryFuture>::Ok
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut UnwrapOrElse<Fut, F>>,
cx: &mut Context
) -> Poll<<UnwrapOrElse<Fut, F> as Future>::Output>
[src]
self: Pin<&mut UnwrapOrElse<Fut, F>>,
cx: &mut Context
) -> Poll<<UnwrapOrElse<Fut, F> as Future>::Output>
impl<Fut, F, E> Future for MapErr<Fut, F> where
F: FnOnce(<Fut as TryFuture>::Error) -> E,
Fut: TryFuture,
[src]
F: FnOnce(<Fut as TryFuture>::Error) -> E,
Fut: TryFuture,
type Output = Result<<Fut as TryFuture>::Ok, E>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut MapErr<Fut, F>>,
cx: &mut Context
) -> Poll<<MapErr<Fut, F> as Future>::Output>
[src]
self: Pin<&mut MapErr<Fut, F>>,
cx: &mut Context
) -> Poll<<MapErr<Fut, F> as Future>::Output>
impl<Fut, F, T> Future for Map<Fut, F> where
F: FnOnce(<Fut as Future>::Output) -> T,
Fut: Future,
[src]
F: FnOnce(<Fut as Future>::Output) -> T,
Fut: Future,
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Map<Fut, F>>, cx: &mut Context) -> Poll<T>
[src]
impl<Fut, F, T> Future for MapOk<Fut, F> where
F: FnOnce(<Fut as TryFuture>::Ok) -> T,
Fut: TryFuture,
[src]
F: FnOnce(<Fut as TryFuture>::Ok) -> T,
Fut: TryFuture,
type Output = Result<T, <Fut as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut MapOk<Fut, F>>,
cx: &mut Context
) -> Poll<<MapOk<Fut, F> as Future>::Output>
[src]
self: Pin<&mut MapOk<Fut, F>>,
cx: &mut Context
) -> Poll<<MapOk<Fut, F> as Future>::Output>
impl<Fut1, Fut2> Future for Join<Fut1, Fut2> where
Fut1: Future,
Fut2: Future,
[src]
Fut1: Future,
Fut2: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output)
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Join<Fut1, Fut2>>,
cx: &mut Context
) -> Poll<<Join<Fut1, Fut2> as Future>::Output>
[src]
self: Pin<&mut Join<Fut1, Fut2>>,
cx: &mut Context
) -> Poll<<Join<Fut1, Fut2> as Future>::Output>
impl<Fut1, Fut2> Future for TryJoin<Fut1, Fut2> where
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
[src]
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryJoin<Fut1, Fut2>>,
cx: &mut Context
) -> Poll<<TryJoin<Fut1, Fut2> as Future>::Output>
[src]
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
F: FnOnce(<Fut1 as TryFuture>::Ok) -> Fut2,
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
[src]
F: FnOnce(<Fut1 as TryFuture>::Ok) -> Fut2,
Fut1: TryFuture,
Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,
type Output = Result<<Fut2 as TryFuture>::Ok, <Fut2 as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut AndThen<Fut1, Fut2, F>>,
cx: &mut Context
) -> Poll<<AndThen<Fut1, Fut2, F> as Future>::Output>
[src]
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
F: FnOnce(<Fut1 as TryFuture>::Error) -> Fut2,
Fut1: TryFuture,
Fut2: TryFuture<Ok = <Fut1 as TryFuture>::Ok>,
[src]
F: FnOnce(<Fut1 as TryFuture>::Error) -> Fut2,
Fut1: TryFuture,
Fut2: TryFuture<Ok = <Fut1 as TryFuture>::Ok>,
type Output = Result<<Fut2 as TryFuture>::Ok, <Fut2 as TryFuture>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut OrElse<Fut1, Fut2, F>>,
cx: &mut Context
) -> Poll<<OrElse<Fut1, Fut2, F> as Future>::Output>
[src]
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
F: FnOnce(<Fut1 as Future>::Output) -> Fut2,
Fut1: Future,
Fut2: Future,
[src]
F: FnOnce(<Fut1 as Future>::Output) -> Fut2,
Fut1: Future,
Fut2: Future,
type Output = <Fut2 as Future>::Output
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Then<Fut1, Fut2, F>>,
cx: &mut Context
) -> Poll<<Fut2 as Future>::Output>
[src]
self: Pin<&mut Then<Fut1, Fut2, F>>,
cx: &mut Context
) -> Poll<<Fut2 as Future>::Output>
impl<Fut1, Fut2, Fut3> Future for Join3<Fut1, Fut2, Fut3> where
Fut1: Future,
Fut2: Future,
Fut3: Future,
[src]
Fut1: Future,
Fut2: Future,
Fut3: Future,
type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <Fut3 as Future>::Output)
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Join3<Fut1, Fut2, Fut3>>,
cx: &mut Context
) -> Poll<<Join3<Fut1, Fut2, Fut3> as Future>::Output>
[src]
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>,
[src]
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryJoin3<Fut1, Fut2, Fut3>>,
cx: &mut Context
) -> Poll<<TryJoin3<Fut1, Fut2, Fut3> as Future>::Output>
[src]
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,
[src]
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)
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Join4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context
) -> Poll<<Join4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
[src]
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>,
[src]
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryJoin4<Fut1, Fut2, Fut3, Fut4>>,
cx: &mut Context
) -> Poll<<TryJoin4<Fut1, Fut2, Fut3, Fut4> as Future>::Output>
[src]
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,
[src]
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)
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Join5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context
) -> Poll<<Join5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
[src]
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>,
[src]
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context
) -> Poll<<TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
[src]
self: Pin<&mut TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5>>,
cx: &mut Context
) -> Poll<<TryJoin5<Fut1, Fut2, Fut3, Fut4, Fut5> as Future>::Output>
impl<R, F> Future for Lazy<F> where
F: FnOnce(&mut Context) -> R,
[src]
F: FnOnce(&mut Context) -> R,
type Output = R
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Lazy<F>>, cx: &mut Context) -> Poll<R>
[src]
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,
[src]
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
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Concat<St>>,
cx: &mut Context
) -> Poll<<Concat<St> as Future>::Output>
[src]
self: Pin<&mut Concat<St>>,
cx: &mut Context
) -> Poll<<Concat<St> as Future>::Output>
impl<St> Future for StreamFuture<St> where
St: Unpin + Stream,
[src]
St: Unpin + Stream,
type Output = (Option<<St as Stream>::Item>, St)
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut StreamFuture<St>>,
cx: &mut Context
) -> Poll<<StreamFuture<St> as Future>::Output>
[src]
self: Pin<&mut StreamFuture<St>>,
cx: &mut Context
) -> Poll<<StreamFuture<St> as Future>::Output>
impl<St, C> Future for Collect<St, C> where
C: Default + Extend<<St as Stream>::Item>,
St: Stream,
[src]
C: Default + Extend<<St as Stream>::Item>,
St: Stream,
type Output = C
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Collect<St, C>>, cx: &mut Context) -> Poll<C>
[src]
impl<St, C> Future for TryCollect<St, C> where
C: Default + Extend<<St as TryStream>::Ok>,
St: TryStream,
[src]
C: Default + Extend<<St as TryStream>::Ok>,
St: TryStream,
type Output = Result<C, <St as TryStream>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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,
[src]
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
type Output = ()
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut ForEach<St, Fut, F>>, cx: &mut Context) -> Poll<()>
[src]
impl<St, Fut, F> Future for ForEachConcurrent<St, Fut, F> where
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
[src]
F: FnMut(<St as Stream>::Item) -> Fut,
Fut: Future<Output = ()>,
St: Stream,
type Output = ()
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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,
[src]
F: FnMut(<St as TryStream>::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = <St as TryStream>::Error>,
St: TryStream,
type Output = Result<(), <St as TryStream>::Error>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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,
[src]
F: FnMut(T, <St as Stream>::Item) -> Fut,
Fut: Future<Output = T>,
St: Stream,
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Fold<St, Fut, T, F>>, cx: &mut Context) -> Poll<T>
[src]
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,
[src]
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>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
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<St, Si, Item, E> Future for Forward<St, Si> where
Si: Sink<Item, SinkError = E>,
St: Stream<Item = Result<Item, E>>,
[src]
Si: Sink<Item, SinkError = E>,
St: Stream<Item = Result<Item, E>>,
type Output = Result<(), <Si as Sink<Item>>::SinkError>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Forward<St, Si>>,
cx: &mut Context
) -> Poll<<Forward<St, Si> as Future>::Output>
[src]
self: Pin<&mut Forward<St, Si>>,
cx: &mut Context
) -> Poll<<Forward<St, Si> as Future>::Output>
impl<T> Future for Receiver<T>
[src]
type Output = Result<T, Canceled>
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(
self: Pin<&mut Receiver<T>>,
cx: &mut Context
) -> Poll<Result<T, Canceled>>
[src]
self: Pin<&mut Receiver<T>>,
cx: &mut Context
) -> Poll<Result<T, Canceled>>
impl<T> Future for Empty<T>
[src]
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Empty<T>>, &mut Context) -> Poll<T>
[src]
impl<T> Future for Ready<T>
[src]
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut Ready<T>>, _cx: &mut Context) -> Poll<T>
[src]
impl<T> Future for RemoteHandle<T> where
T: 'static + Send,
[src]
T: 'static + Send,
type Output = T
🔬 This is a nightly-only experimental API. (futures_api
)
futures in libcore are unstable
fn poll(self: Pin<&mut RemoteHandle<T>>, cx: &mut Context) -> Poll<T>
[src]
impl<T, F> Future for PollFn<F> where
F: FnMut(&mut Context) -> Poll<T>,
[src]
F: FnMut(&mut Context) -> Poll<T>,