Trait futures::prelude::future::FusedFuture

pub trait FusedFuture: Future {
    fn is_terminated(&self) -> bool;
}

A future which tracks whether or not the underlying future should no longer be polled.

is_terminated will return true if a future should no longer be polled. Usually, this state occurs after poll (or try_poll) returned Poll::Ready. However, is_terminated may also return true if a future has become inactive and can no longer make progress and should be ignored or dropped rather than being polled again.

Required methods

fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.

Implementations on Foreign Types

impl<F> FusedFuture for Box<F, Global> where
    F: FusedFuture + Unpin + ?Sized, 

fn is_terminated(&self) -> bool

impl<'_, F> FusedFuture for &'_ mut F where
    F: FusedFuture + Unpin + ?Sized, 

fn is_terminated(&self) -> bool

impl<P> FusedFuture for Pin<P> where
    P: DerefMut + Unpin,
    <P as Deref>::Target: FusedFuture, 

fn is_terminated(&self) -> bool

impl<F> FusedFuture for AssertUnwindSafe<F> where
    F: FusedFuture, 

fn is_terminated(&self) -> bool

Implementors

impl<'_, St> FusedFuture for Next<'_, St> where
    St: FusedStream + Unpin + ?Sized, 

impl<'_, St> FusedFuture for Peek<'_, St> where
    St: Stream, 

impl<'_, St> FusedFuture for PeekMut<'_, St> where
    St: Stream, 

impl<'_, St> FusedFuture for SelectNextSome<'_, St> where
    St: FusedStream + Unpin + ?Sized, 

impl<'_, St> FusedFuture for TryNext<'_, St> where
    St: TryStream + Unpin + FusedStream + ?Sized, 

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

impl<'_, St, T> FusedFuture for NextIfEq<'_, St, T> where
    St: Stream,
    T: ?Sized,
    <St as Stream>::Item: PartialEq<T>, 

impl<'_, T> FusedFuture for MutexLockFuture<'_, T> where
    T: ?Sized, 

impl<A, B> FusedFuture for Either<A, B> where
    A: FusedFuture,
    B: FusedFuture<Output = <A as Future>::Output>, 

impl<A, B> FusedFuture for Select<A, B> where
    A: Future + Unpin,
    B: Future + Unpin, 

impl<F> FusedFuture for Flatten<F> where
    F: Future,
    Flatten<F, <F as Future>::Output>: FusedFuture, 

impl<F> FusedFuture for OptionFuture<F> where
    F: FusedFuture, 

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

impl<Fut1, Fut2> FusedFuture for Join<Fut1, Fut2> where
    Fut1: FusedFuture,
    Fut2: FusedFuture, 

impl<Fut1, Fut2> FusedFuture for TryFlatten<Fut1, Fut2> where
    TryFlatten<Fut1, Fut2>: FusedFuture, 

impl<Fut1, Fut2, F> FusedFuture for AndThen<Fut1, Fut2, F> where
    TryFlatten<MapOk<Fut1, F>, Fut2>: FusedFuture, 

impl<Fut1, Fut2, F> FusedFuture for OrElse<Fut1, Fut2, F> where
    TryFlattenErr<MapErr<Fut1, F>, Fut2>: FusedFuture, 

impl<Fut1, Fut2, F> FusedFuture for Then<Fut1, Fut2, F> where
    Flatten<Map<Fut1, F>, Fut2>: FusedFuture, 

impl<Fut1, Fut2, Fut3> FusedFuture for Join3<Fut1, Fut2, Fut3> where
    Fut1: FusedFuture,
    Fut2: FusedFuture,
    Fut3: FusedFuture, 

impl<Fut1, Fut2, Fut3, Fut4> FusedFuture for Join4<Fut1, Fut2, Fut3, Fut4> where
    Fut1: FusedFuture,
    Fut2: FusedFuture,
    Fut3: FusedFuture,
    Fut4: FusedFuture, 

impl<Fut1, Fut2, Fut3, Fut4, Fut5> FusedFuture for Join5<Fut1, Fut2, Fut3, Fut4, Fut5> where
    Fut1: FusedFuture,
    Fut2: FusedFuture,
    Fut3: FusedFuture,
    Fut4: FusedFuture,
    Fut5: FusedFuture, 

impl<Fut> FusedFuture for MaybeDone<Fut> where
    Fut: Future, 

impl<Fut> FusedFuture for TryMaybeDone<Fut> where
    Fut: TryFuture, 

impl<Fut> FusedFuture for Fuse<Fut> where
    Fut: Future, 

impl<Fut> FusedFuture for IntoFuture<Fut> where
    Fut: TryFuture + FusedFuture, 

impl<Fut> FusedFuture for NeverError<Fut> where
    Map<Fut, OkFn<Infallible>>: FusedFuture, 

impl<Fut> FusedFuture for Shared<Fut> where
    Fut: Future,
    <Fut as Future>::Output: Clone, 

impl<Fut> FusedFuture for UnitError<Fut> where
    Map<Fut, OkFn<()>>: FusedFuture, 

impl<Fut, E> FusedFuture for ErrInto<Fut, E> where
    MapErr<Fut, IntoFn<E>>: FusedFuture, 

impl<Fut, E> FusedFuture for OkInto<Fut, E> where
    MapOk<Fut, IntoFn<E>>: FusedFuture, 

impl<Fut, F> FusedFuture for Inspect<Fut, F> where
    Map<Fut, InspectFn<F>>: FusedFuture, 

impl<Fut, F> FusedFuture for InspectErr<Fut, F> where
    Inspect<IntoFuture<Fut>, InspectErrFn<F>>: FusedFuture, 

impl<Fut, F> FusedFuture for InspectOk<Fut, F> where
    Inspect<IntoFuture<Fut>, InspectOkFn<F>>: FusedFuture, 

impl<Fut, F> FusedFuture for Map<Fut, F> where
    Map<Fut, F>: FusedFuture, 

impl<Fut, F> FusedFuture for MapErr<Fut, F> where
    Map<IntoFuture<Fut>, MapErrFn<F>>: FusedFuture, 

impl<Fut, F> FusedFuture for MapOk<Fut, F> where
    Map<IntoFuture<Fut>, MapOkFn<F>>: FusedFuture, 

impl<Fut, F> FusedFuture for UnwrapOrElse<Fut, F> where
    Map<IntoFuture<Fut>, UnwrapOrElseFn<F>>: FusedFuture, 

impl<Fut, F, G> FusedFuture for MapOkOrElse<Fut, F, G> where
    Map<IntoFuture<Fut>, ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>>: FusedFuture, 

impl<Fut, T> FusedFuture for MapInto<Fut, T> where
    Map<Fut, IntoFn<T>>: FusedFuture, 

impl<St> FusedFuture for Concat<St> where
    St: FusedStream,
    <St as Stream>::Item: Extend<<<St as Stream>::Item as IntoIterator>::Item>,
    <St as Stream>::Item: IntoIterator,
    <St as Stream>::Item: Default, 

impl<St> FusedFuture for StreamFuture<St> where
    St: Stream + Unpin, 

impl<St, A, B, FromA, FromB> FusedFuture for Unzip<St, FromA, FromB> where
    St: FusedStream<Item = (A, B)>,
    FromA: Default + Extend<A>,
    FromB: Default + Extend<B>, 

impl<St, C> FusedFuture for Collect<St, C> where
    St: FusedStream,
    C: Default + Extend<<St as Stream>::Item>, 

impl<St, C> FusedFuture for TryCollect<St, C> where
    St: TryStream + FusedStream,
    C: Default + Extend<<St as TryStream>::Ok>, 

impl<St, Fut, F> FusedFuture for ForEach<St, Fut, F> where
    St: FusedStream,
    F: FnMut(<St as Stream>::Item) -> Fut,
    Fut: Future<Output = ()>, 

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

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

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

impl<St, Fut, T, F> FusedFuture 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>, 

impl<St, Si> FusedFuture for Forward<St, Si> where
    St: TryStream,
    Forward<St, Si, <St as TryStream>::Ok>: FusedFuture, 

impl<T> FusedFuture for Receiver<T>

impl<T> FusedFuture for Pending<T>

impl<T> FusedFuture for PollImmediate<T> where
    T: Future, 

impl<T> FusedFuture for Ready<T>