Trait Future 

pub trait Future {
    type Output;

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

A future represents an asynchronous computation, commonly obtained by use of async.

A future is a value that might 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 polling 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.

Required Associated Types

type Output

The type of value produced on completion.

Required Methods

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

Attempts 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 yet
• Poll::Ready(val) with the result val 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 polled for the underlying computation 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.

Having said that, some Futures may represent a value that is being computed in a different task. In this case, the future’s underlying computation is simply acting as a conduit for a value being computed by that other task, which will proceed independently of the Future. Futures of this kind are typically obtained when spawning a new task into an async runtime.

The poll function should not be 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 a while, 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> + Unpin)

fn into_raw(self) -> *mut dyn Future<Output = T> + 'a

Convert an owned instance into a (conceptually owned) fat pointer.

unsafe fn drop(_ptr: *mut dyn Future<Output = T> + 'a)

Drops the future represented by the given fat pointer.

impl<'a, T> UnsafeFutureObj<'a, T> for Box<dyn Future<Output = T> + 'a>

where T: 'a,

fn into_raw(self) -> *mut dyn Future<Output = T> + 'a

Convert an owned instance into a (conceptually owned) fat pointer.

unsafe fn drop(ptr: *mut dyn Future<Output = T> + 'a)

Drops the future represented by the given fat pointer.

impl<'a, T> UnsafeFutureObj<'a, T> for Box<dyn Future<Output = T> + Send + 'a>

where T: 'a,

fn into_raw(self) -> *mut dyn Future<Output = T> + 'a

Convert an owned instance into a (conceptually owned) fat pointer.

unsafe fn drop(ptr: *mut dyn Future<Output = T> + 'a)

Drops the future represented by the given fat pointer.

impl<'a, T> UnsafeFutureObj<'a, T> for Pin<&'a mut dyn Future<Output = T>>

fn into_raw(self) -> *mut dyn Future<Output = T> + 'a

Convert an owned instance into a (conceptually owned) fat pointer.

unsafe fn drop(_ptr: *mut dyn Future<Output = T> + 'a)

Drops the future represented by the given fat pointer.

Implementors

impl Future for rama::http::core::h2::client::PushedResponseFuture

type Output = Result<Response<RecvStream>, Error>

impl Future for rama::http::core::h2::client::ResponseFuture

type Output = Result<Response<RecvStream>, Error>

impl Future for OnUpgrade

type Output = Result<Upgraded, OpaqueError>

impl Future for LocalSet

type Output = ()

impl Future for Notified<'_>

type Output = ()

impl Future for OwnedNotified

type Output = ()

impl Future for PushedResponseFuture

type Output = Result<Response<RecvStream>, Error>

impl Future for ResponseFuture

type Output = Result<Response<RecvStream>, Error>

impl Future for Sleep

type Output = ()

impl Future for WaitForCancellationFutureOwned

type Output = ()

impl<'a> Future for WaitForCancellationFuture<'a>

type Output = ()

impl<'a, L> Future for ListenerAcceptFut<'a, L>

where L: Listener,

type Output = Result<(<L as Listener>::Io, <L as Listener>::Addr), Error>

impl<'a, R> Future for FillBuf<'a, R>

where R: AsyncBufRead + Unpin + ?Sized,

type Output = Result<&'a [u8], Error>

impl<'a, St> Future for Peek<'a, St>

where St: Stream,

type Output = Option<&'a <St as Stream>::Item>

impl<'a, St> Future for PeekMut<'a, St>

where St: Stream,

type Output = Option<&'a mut <St as Stream>::Item>

impl<'a, T> Future for MutexLockFuture<'a, T>

where T: ?Sized,

type Output = MutexGuard<'a, T>

impl<'a, T> Future for RecvFut<'a, T>

type Output = Result<T, RecvError>

impl<'a, T> Future for SendFut<'a, T>

type Output = Result<(), SendError<T>>

impl<A> Future for ReadToEnd<'_, A>

where A: AsyncRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<A> Future for ReadToString<'_, A>

where A: AsyncRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<A, B> Future for rama::futures::prelude::future::Either<A, B>

where A: Future, B: Future<Output = <A as Future>::Output>,

type Output = <A as Future>::Output

impl<A, B> Future for Select<A, B>

where A: Future + Unpin, B: Future + Unpin,

type Output = Either<(<A as Future>::Output, B), (<B as Future>::Output, A)>

impl<A, B> Future for TrySelect<A, B>

where 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)>>

impl<A, B, C, D, E, F, G, H, I, Output> Future for Either9<A, B, C, D, E, F, G, H, I>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>, I: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, H, I, Output> Future for EitherConn9<A, B, C, D, E, F, G, H, I>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>, I: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, H, I, Output> Future for EitherConn9Connected<A, B, C, D, E, F, G, H, I>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>, I: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, H, Output> Future for Either8<A, B, C, D, E, F, G, H>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, H, Output> Future for EitherConn8<A, B, C, D, E, F, G, H>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, H, Output> Future for EitherConn8Connected<A, B, C, D, E, F, G, H>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>, H: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, Output> Future for Either7<A, B, C, D, E, F, G>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, Output> Future for EitherConn7<A, B, C, D, E, F, G>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, G, Output> Future for EitherConn7Connected<A, B, C, D, E, F, G>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>, G: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, Output> Future for Either6<A, B, C, D, E, F>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, Output> Future for EitherConn6<A, B, C, D, E, F>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, F, Output> Future for EitherConn6Connected<A, B, C, D, E, F>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>, F: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, Output> Future for Either5<A, B, C, D, E>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, Output> Future for EitherConn5<A, B, C, D, E>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, E, Output> Future for EitherConn5Connected<A, B, C, D, E>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>, E: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, Output> Future for Either4<A, B, C, D>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, Output> Future for EitherConn4<A, B, C, D>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>,

type Output = Output

impl<A, B, C, D, Output> Future for EitherConn4Connected<A, B, C, D>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>, D: Future<Output = Output>,

type Output = Output

impl<A, B, C, Output> Future for Either3<A, B, C>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>,

type Output = Output

impl<A, B, C, Output> Future for EitherConn3<A, B, C>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>,

type Output = Output

impl<A, B, C, Output> Future for EitherConn3Connected<A, B, C>

where A: Future<Output = Output>, B: Future<Output = Output>, C: Future<Output = Output>,

type Output = Output

impl<A, B, Output> Future for rama::combinators::Either<A, B>

where A: Future<Output = Output>, B: Future<Output = Output>,

type Output = Output

impl<A, B, Output> Future for EitherConn<A, B>

where A: Future<Output = Output>, B: Future<Output = Output>,

type Output = Output

impl<A, B, Output> Future for EitherConnConnected<A, B>

where A: Future<Output = Output>, B: Future<Output = Output>,

type Output = Output

impl<B> Future for rama::http::core::h2::client::ReadySendRequest<B>

where B: Buf,

type Output = Result<SendRequest<B>, Error>

impl<B> Future for ReadySendRequest<B>

where B: Buf,

type Output = Result<SendRequest<B>, Error>

impl<C> Future for LookupIpFuture<C>

where C: DnsHandle + 'static,

type Output = Result<LookupIp, ResolveError>

impl<E, S, T> Future for FirstAnswerFuture<S>

where S: Stream<Item = Result<T, E>, Item = Result<T, E>> + Unpin + Stream, E: From<ProtoError>,

type Output = <S as Stream>::Item

impl<F1, F2> Future for Zip<F1, F2>

where F1: Future, F2: Future,

type Output = (<F1 as Future>::Output, <F2 as Future>::Output)

impl<F> Future for &mut F

where F: Future + Unpin + ?Sized,

type Output = <F as Future>::Output

impl<F> Future for Flatten<F>

where Flatten<F, <F as Future>::Output>: Future, F: Future,

type Output = <Flatten<F, <F as Future>::Output> as Future>::Output

impl<F> Future for JoinAll<F>

where F: Future,

type Output = Vec<<F as Future>::Output>

impl<F> Future for OptionFuture<F>

where F: Future,

type Output = Option<<F as Future>::Output>

impl<F> Future for TryJoinAll<F>

where F: TryFuture,

type Output = Result<Vec<<F as TryFuture>::Ok>, <F as TryFuture>::Error>

impl<F> Future for AssertUnwindSafe<F>

where F: Future,

type Output = <F as Future>::Output

impl<F> Future for Coop<F>

where F: Future,

type Output = <F as Future>::Output

impl<F> Future for SyncFuture<F>

where F: Future,

type Output = <F as Future>::Output

impl<F> Future for Unconstrained<F>

where F: Future,

type Output = <F as Future>::Output

impl<F, A> Future for rama::crypto::dep::x509_parser::prelude::asn1_rs::nom::lib::std::boxed::Box<F, A>

where F: Future + Unpin + ?Sized, A: Allocator,

type Output = <F as Future>::Output

impl<F, A> Future for Box<F, A>

where F: Future + Unpin + ?Sized, A: Allocator + 'static,

type Output = <F as Future>::Output

impl<F, R> Future for Lazy<F>

where F: FnOnce(&mut Context<'_>) -> R,

type Output = R

impl<F, S> Future for DnsMultiplexerConnect<F, S>

where F: Future<Output = Result<S, ProtoError>> + Send + Unpin + 'static, S: DnsClientStream + Unpin + 'static,

type Output = Result<DnsMultiplexer<S>, ProtoError>

impl<F, S, TE> Future for DnsExchangeConnect<F, S, TE>

where F: Future<Output = Result<S, ProtoError>> + 'static + Send + Unpin, S: DnsRequestSender + 'static + Send + Unpin, TE: Time + Unpin,

type Output = Result<(DnsExchange, DnsExchangeBackground<S, TE>), ProtoError>

impl<Fut1, Fut2> Future for Join<Fut1, Fut2>

where Fut1: Future, Fut2: Future,

type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output)

impl<Fut1, Fut2> Future for TryFlatten<Fut1, Fut2>

where TryFlatten<Fut1, Fut2>: Future,

type Output = <TryFlatten<Fut1, Fut2> as Future>::Output

impl<Fut1, Fut2> Future for TryJoin<Fut1, Fut2>

where Fut1: TryFuture, Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>,

type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>

impl<Fut1, Fut2, F> Future for AndThen<Fut1, Fut2, F>

where TryFlatten<MapOk<Fut1, F>, Fut2>: Future,

type Output = <TryFlatten<MapOk<Fut1, F>, Fut2> as Future>::Output

impl<Fut1, Fut2, F> Future for OrElse<Fut1, Fut2, F>

where TryFlattenErr<MapErr<Fut1, F>, Fut2>: Future,

type Output = <TryFlattenErr<MapErr<Fut1, F>, Fut2> as Future>::Output

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

impl<Fut1, Fut2, Fut3> Future for Join3<Fut1, Fut2, Fut3>

where Fut1: Future, Fut2: Future, Fut3: Future,

type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <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>,

type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok, <Fut3 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>

impl<Fut1, Fut2, Fut3, Fut4> Future for Join4<Fut1, Fut2, Fut3, Fut4>

where 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)

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>,

type Output = Result<(<Fut1 as TryFuture>::Ok, <Fut2 as TryFuture>::Ok, <Fut3 as TryFuture>::Ok, <Fut4 as TryFuture>::Ok), <Fut1 as TryFuture>::Error>

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,

type Output = (<Fut1 as Future>::Output, <Fut2 as Future>::Output, <Fut3 as Future>::Output, <Fut4 as Future>::Output, <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>,

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>

impl<Fut> Future for MaybeDone<Fut>

where Fut: Future,

type Output = ()

impl<Fut> Future for TryMaybeDone<Fut>

where Fut: TryFuture,

type Output = Result<(), <Fut as TryFuture>::Error>

impl<Fut> Future for Abortable<Fut>

where Fut: Future,

type Output = Result<<Fut as Future>::Output, Aborted>

impl<Fut> Future for CatchUnwind<Fut>

where Fut: Future + UnwindSafe,

type Output = Result<<Fut as Future>::Output, Box<dyn Any + Send>>

impl<Fut> Future for Fuse<Fut>

where Fut: Future,

type Output = <Fut as Future>::Output

impl<Fut> Future for IntoFuture<Fut>

where Fut: TryFuture,

type Output = Result<<Fut as TryFuture>::Ok, <Fut as TryFuture>::Error>

impl<Fut> Future for NeverError<Fut>

where Map<Fut, OkFn<Infallible>>: Future,

type Output = <Map<Fut, OkFn<Infallible>> as Future>::Output

impl<Fut> Future for Remote<Fut>

where Fut: Future,

type Output = ()

impl<Fut> Future for SelectAll<Fut>

where Fut: Future + Unpin,

type Output = (<Fut as Future>::Output, usize, Vec<Fut>)

impl<Fut> Future for SelectOk<Fut>

where Fut: TryFuture + Unpin,

type Output = Result<(<Fut as TryFuture>::Ok, Vec<Fut>), <Fut as TryFuture>::Error>

impl<Fut> Future for Shared<Fut>

where Fut: Future, <Fut as Future>::Output: Clone,

type Output = <Fut as Future>::Output

impl<Fut> Future for UnitError<Fut>

where Map<Fut, OkFn<()>>: Future,

type Output = <Map<Fut, OkFn<()>> as Future>::Output

impl<Fut, E> Future for ErrInto<Fut, E>

where MapErr<Fut, IntoFn<E>>: Future,

type Output = <MapErr<Fut, IntoFn<E>> as Future>::Output

impl<Fut, E> Future for OkInto<Fut, E>

where MapOk<Fut, IntoFn<E>>: Future,

type Output = <MapOk<Fut, IntoFn<E>> as Future>::Output

impl<Fut, F> Future for Inspect<Fut, F>

where Map<Fut, InspectFn<F>>: Future,

type Output = <Map<Fut, InspectFn<F>> as Future>::Output

impl<Fut, F> Future for InspectErr<Fut, F>

where Inspect<IntoFuture<Fut>, InspectErrFn<F>>: Future,

type Output = <Inspect<IntoFuture<Fut>, InspectErrFn<F>> as Future>::Output

impl<Fut, F> Future for InspectOk<Fut, F>

where Inspect<IntoFuture<Fut>, InspectOkFn<F>>: Future,

type Output = <Inspect<IntoFuture<Fut>, InspectOkFn<F>> as Future>::Output

impl<Fut, F> Future for Map<Fut, F>

where Map<Fut, F>: Future,

type Output = <Map<Fut, F> as Future>::Output

impl<Fut, F> Future for MapErr<Fut, F>

where Map<IntoFuture<Fut>, MapErrFn<F>>: Future,

type Output = <Map<IntoFuture<Fut>, MapErrFn<F>> as Future>::Output

impl<Fut, F> Future for MapOk<Fut, F>

where Map<IntoFuture<Fut>, MapOkFn<F>>: Future,

type Output = <Map<IntoFuture<Fut>, MapOkFn<F>> as Future>::Output

impl<Fut, F> Future for UnwrapOrElse<Fut, F>

where Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: Future,

type Output = <Map<IntoFuture<Fut>, UnwrapOrElseFn<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,

type Output = <Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>> as Future>::Output

impl<Fut, T> Future for MapInto<Fut, T>

where Map<Fut, IntoFn<T>>: Future,

type Output = <Map<Fut, IntoFn<T>> as Future>::Output

impl<I, S> Future for rama::http::core::server::conn::auto::Connection<'_, I, S>

where S: HttpService<Incoming>, I: AsyncRead + AsyncWrite + Send + Unpin + 'static,

type Output = Result<(), Box<dyn Error + Sync + Send>>

impl<I, S> Future for rama::http::core::server::conn::auto::UpgradeableConnection<'_, I, S>

where S: HttpService<Incoming>, I: AsyncRead + AsyncWrite + Send + Unpin + 'static,

type Output = Result<(), Box<dyn Error + Sync + Send>>

impl<I, S> Future for rama::http::core::server::conn::http1::Connection<I, S>

where S: HttpService<Incoming>, I: AsyncRead + AsyncWrite + Send + Unpin + 'static,

type Output = Result<(), Error>

impl<I, S> Future for rama::http::core::server::conn::http1::UpgradeableConnection<I, S>

where S: HttpService<Incoming>, I: AsyncRead + AsyncWrite + Send + Unpin + 'static,

type Output = Result<(), Error>

impl<I, S> Future for rama::http::core::server::conn::http2::Connection<I, S>

where S: HttpService<Incoming>, I: AsyncRead + AsyncWrite + Send + Unpin + 'static,

type Output = Result<(), Error>

impl<IO> Future for Accept<IO>

where IO: AsyncRead + AsyncWrite + Unpin,

type Output = Result<TlsStream<IO>, Error>

impl<IO> Future for Connect<IO>

where IO: AsyncRead + AsyncWrite + Unpin,

type Output = Result<TlsStream<IO>, Error>

impl<IO> Future for FallibleAccept<IO>

where IO: AsyncRead + AsyncWrite + Unpin,

type Output = Result<TlsStream<IO>, (Error, IO)>

impl<IO> Future for FallibleConnect<IO>

where IO: AsyncRead + AsyncWrite + Unpin,

type Output = Result<TlsStream<IO>, (Error, IO)>

impl<IO> Future for LazyConfigAcceptor<IO>

where IO: AsyncRead + AsyncWrite + Unpin,

type Output = Result<StartHandshake<IO>, Error>

impl<L, R> Future for either::Either<L, R>

where L: Future, R: Future<Output = <L as Future>::Output>,

Either<L, R> is a future if both L and R are futures.

type Output = <L as Future>::Output

impl<L, R, O> Future for Either<L, R>

where L: Future<Output = O>, R: Future<Output = O>,

type Output = O

impl<P> Future for UdpClientConnect<P>

where P: RuntimeProvider,

type Output = Result<UdpClientStream<P>, ProtoError>

impl<P> Future for Pin<P>

where P: DerefMut, <P as Deref>::Target: Future,

type Output = <<P as Deref>::Target as Future>::Output

impl<R> Future for Read<'_, R>

where R: AsyncRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<R> Future for ReadExact<'_, R>

where R: AsyncRead + Unpin + ?Sized,

type Output = Result<(), Error>

impl<R> Future for ReadLine<'_, R>

where R: AsyncBufRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<R> Future for ReadUntil<'_, R>

where R: AsyncBufRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<R> Future for ReadVectored<'_, R>

where R: AsyncRead + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<R> Future for SeeKRelative<'_, R>

where R: AsyncRead + AsyncSeek,

type Output = Result<(), Error>

impl<R, W> Future for Copy<'_, R, W>

where R: AsyncRead, W: AsyncWrite + Unpin + ?Sized,

type Output = Result<u64, Error>

impl<R, W> Future for CopyBuf<'_, R, W>

where R: AsyncBufRead, W: AsyncWrite + Unpin + ?Sized,

type Output = Result<u64, Error>

impl<R, W> Future for CopyBufAbortable<'_, R, W>

where R: AsyncBufRead, W: AsyncWrite + Unpin,

type Output = Result<Result<u64, Aborted>, Error>

impl<S> Future for HandshakeFuture<S>

where S: AsyncRead + AsyncWrite + Unpin,

type Output = Result<SslStream<S>, HandshakeError<S>>

impl<S> Future for Seek<'_, S>

where S: AsyncSeek + Unpin + ?Sized,

type Output = Result<u64, Error>

impl<S, TE> Future for DnsExchangeBackground<S, TE>

where S: DnsRequestSender + 'static + Send + Unpin, TE: Time + Unpin,

type Output = Result<(), ProtoError>

impl<Si, Item> Future for rama::futures::prelude::sink::Close<'_, Si, Item>

where Si: Sink<Item> + Unpin + ?Sized,

type Output = Result<(), <Si as Sink<Item>>::Error>

impl<Si, Item> Future for Feed<'_, Si, Item>

where Si: Sink<Item> + Unpin + ?Sized,

type Output = Result<(), <Si as Sink<Item>>::Error>

impl<Si, Item> Future for rama::futures::prelude::sink::Flush<'_, Si, Item>

where Si: Sink<Item> + Unpin + ?Sized,

type Output = Result<(), <Si as Sink<Item>>::Error>

impl<Si, Item> Future for Send<'_, Si, Item>

where Si: Sink<Item> + Unpin + ?Sized,

type Output = Result<(), <Si as Sink<Item>>::Error>

impl<Si, St, Ok, Error> Future for SendAll<'_, Si, St>

where Si: Sink<Ok, Error = Error> + Unpin + ?Sized, St: Stream<Item = Result<Ok, Error>> + Unpin + ?Sized,

type Output = Result<(), Error>

impl<St> Future for Concat<St>

where St: Stream, <St as Stream>::Item: Extend<<<St as Stream>::Item as IntoIterator>::Item> + IntoIterator + Default,

type Output = <St as Stream>::Item

impl<St> Future for Count<St>

where St: Stream,

type Output = usize

impl<St> Future for Next<'_, St>

where St: Stream + Unpin + ?Sized,

type Output = Option<<St as Stream>::Item>

impl<St> Future for SelectNextSome<'_, St>

where St: FusedStream + Unpin + ?Sized,

type Output = <St as Stream>::Item

impl<St> Future for StreamFuture<St>

where St: Stream + Unpin,

type Output = (Option<<St as Stream>::Item>, St)

impl<St> Future for TryConcat<St>

where St: TryStream, <St as TryStream>::Ok: Extend<<<St as TryStream>::Ok as IntoIterator>::Item> + IntoIterator + Default,

type Output = Result<<St as TryStream>::Ok, <St as TryStream>::Error>

impl<St> Future for TryNext<'_, St>

where St: TryStream + Unpin + ?Sized,

type Output = Result<Option<<St as TryStream>::Ok>, <St as TryStream>::Error>

impl<St, A, B, FromA, FromB> Future for Unzip<St, FromA, FromB>

where St: Stream<Item = (A, B)>, FromA: Default + Extend<A>, FromB: Default + Extend<B>,

type Output = (FromA, FromB)

impl<St, C> Future for rama::futures::prelude::stream::Collect<St, C>

where St: Stream, C: Default + Extend<<St as Stream>::Item>,

type Output = C

impl<St, C> Future for TryCollect<St, C>

where St: TryStream, C: Default + Extend<<St as TryStream>::Ok>,

type Output = Result<C, <St as TryStream>::Error>

impl<St, F> Future for NextIf<'_, St, F>

where St: Stream, F: for<'a> FnOnce1<&'a <St as Stream>::Item, Output = bool>,

type Output = Option<<St as Stream>::Item>

impl<St, Fut, F> Future for All<St, Fut, F>

where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = bool>,

type Output = bool

impl<St, Fut, F> Future for Any<St, Fut, F>

where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = bool>,

type Output = bool

impl<St, Fut, F> Future for ForEach<St, Fut, F>

where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = ()>,

type Output = ()

impl<St, Fut, F> Future for ForEachConcurrent<St, Fut, F>

where St: Stream, F: FnMut(<St as Stream>::Item) -> Fut, Fut: Future<Output = ()>,

type Output = ()

impl<St, Fut, F> Future for TryAll<St, Fut, F>

where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: Future<Output = bool>,

type Output = Result<bool, <St as TryStream>::Error>

impl<St, Fut, F> Future for TryAny<St, Fut, F>

where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: Future<Output = bool>,

type Output = Result<bool, <St as TryStream>::Error>

impl<St, Fut, F> Future for TryForEach<St, Fut, F>

where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: TryFuture<Ok = (), Error = <St as TryStream>::Error>,

type Output = Result<(), <St as TryStream>::Error>

impl<St, Fut, F> Future for TryForEachConcurrent<St, Fut, F>

where St: TryStream, F: FnMut(<St as TryStream>::Ok) -> Fut, Fut: Future<Output = Result<(), <St as TryStream>::Error>>,

type Output = Result<(), <St as TryStream>::Error>

impl<St, Fut, T, F> Future for Fold<St, Fut, T, F>

where St: Stream, F: FnMut(T, <St as Stream>::Item) -> Fut, Fut: Future<Output = T>,

type Output = T

impl<St, Fut, T, F> Future for TryFold<St, Fut, T, F>

where St: TryStream, F: FnMut(T, <St as TryStream>::Ok) -> Fut, Fut: TryFuture<Ok = T, Error = <St as TryStream>::Error>,

type Output = Result<T, <St as TryStream>::Error>

impl<St, Si> Future for Forward<St, Si>

where Forward<St, Si, <St as TryStream>::Ok>: Future, St: TryStream,

type Output = <Forward<St, Si, <St as TryStream>::Ok> as Future>::Output

impl<St, T> Future for NextIfEq<'_, St, T>

where St: Stream, <St as Stream>::Item: PartialEq<T>, T: ?Sized,

type Output = Option<<St as Stream>::Item>

impl<T1, T2, E, F1, F2> Future for TryZip<F1, T1, F2, T2>

where F1: Future<Output = Result<T1, E>>, F2: Future<Output = Result<T2, E>>,

type Output = Result<(T1, T2), E>

impl<T> Future for rama::http::body::util::combinators::Collect<T>

where T: Body + ?Sized,

type Output = Result<Collected<<T as Body>::Data>, <T as Body>::Error>

impl<T> Future for Frame<'_, T>

where T: Body + Unpin + ?Sized,

type Output = Option<Result<Frame<<T as Body>::Data>, <T as Body>::Error>>

impl<T> Future for WithContext<T>

where T: Future,

type Output = <T as Future>::Output

impl<T> Future for Instrumented<T>

where T: Future,

type Output = <T as Future>::Output

impl<T> Future for WithDispatch<T>

where T: Future,

type Output = <T as Future>::Output

impl<T> Future for Cancellation<'_, T>

type Output = ()

impl<T> Future for rama::futures::channel::oneshot::Receiver<T>

type Output = Result<T, Canceled>

impl<T> Future for OwnedMutexLockFuture<T>

where T: ?Sized,

type Output = OwnedMutexGuard<T>

impl<T> Future for FutureObj<'_, T>

type Output = T

impl<T> Future for LocalFutureObj<'_, T>

type Output = T

impl<T> Future for rama::futures::prelude::future::Pending<T>

type Output = T

impl<T> Future for rama::futures::prelude::future::Ready<T>

type Output = T

impl<T> Future for RemoteHandle<T>

where T: 'static,

type Output = T

impl<T> Future for core::future::pending::Pending<T>

type Output = T

impl<T> Future for core::future::ready::Ready<T>

type Output = T

impl<T> Future for Exclusive<T>

where T: Future + ?Sized,

type Output = <T as Future>::Output

impl<T> Future for JoinHandle<T>

type Output = Result<T, JoinError>

impl<T> Future for Receiver<T>

type Output = Result<T, RecvError>

impl<T> Future for ReusableBoxFuture<'_, T>

type Output = T

impl<T> Future for Timeout<T>

where T: Future,

type Output = Result<<T as Future>::Output, Elapsed>

impl<T, B> Future for rama::http::core::client::conn::http1::Connection<T, B>

where T: AsyncRead + AsyncWrite + Unpin, B: Body + Send + 'static + Unpin, <B as Body>::Data: Send + 'static, <B as Body>::Error: Into<Box<dyn Error + Sync + Send>>,

type Output = Result<(), Error>

impl<T, B> Future for rama::http::core::client::conn::http2::Connection<T, B>

where T: AsyncRead + AsyncWrite + Unpin + Send + 'static, B: Body + Send + 'static + Unpin, <B as Body>::Data: Send + 'static, <B as Body>::Error: Into<Box<dyn Error + Sync + Send>>,

type Output = Result<(), Error>

impl<T, B> Future for rama::http::core::h2::client::Connection<T, B>

where T: AsyncRead + AsyncWrite + Unpin, B: Buf,

type Output = Result<(), Error>

impl<T, B> Future for rama::http::core::h2::server::Handshake<T, B>

where B: Buf, T: AsyncRead + AsyncWrite + Unpin,

type Output = Result<Connection<T, B>, Error>

impl<T, B> Future for Connection<T, B>

where T: AsyncRead + AsyncWrite + Unpin, B: Buf,

type Output = Result<(), Error>

impl<T, B> Future for Handshake<T, B>

where B: Buf, T: AsyncRead + AsyncWrite + Unpin,

type Output = Result<Connection<T, B>, Error>

impl<T, F> Future for AlwaysReady<T, F>

where F: Fn() -> T,

type Output = T

impl<T, F> Future for rama::futures::prelude::future::PollFn<F>

where F: FnMut(&mut Context<'_>) -> Poll<T>,

type Output = T

impl<T, F> Future for PollImmediate<F>

where F: Future<Output = T>,

type Output = Option<T>

impl<T, F> Future for core::future::poll_fn::PollFn<F>

where F: FnMut(&mut Context<'_>) -> Poll<T>,

type Output = T

impl<T, F> Future for TaskLocalFuture<T, F>

where T: 'static, F: Future,

type Output = <F as Future>::Output

impl<W> Future for rama::futures::io::Close<'_, W>

where W: AsyncWrite + Unpin + ?Sized,

type Output = Result<(), Error>

impl<W> Future for rama::futures::io::Flush<'_, W>

where W: AsyncWrite + Unpin + ?Sized,

type Output = Result<(), Error>

impl<W> Future for Write<'_, W>

where W: AsyncWrite + Unpin + ?Sized,

type Output = Result<usize, Error>

impl<W> Future for WriteAll<'_, W>

where W: AsyncWrite + Unpin + ?Sized,

type Output = Result<(), Error>

impl<W> Future for WriteVectored<'_, W>

where W: AsyncWrite + Unpin + ?Sized,

type Output = Result<usize, Error>