Trait futures_util::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 &mut Fwhere
    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

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

fn is_terminated(&self) -> bool

impl<T> FusedFuture for Receiver<T>

fn is_terminated(&self) -> bool

Implementors

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

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

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

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

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

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

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

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

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

impl<Fut> FusedFuture for NeverError<Fut>where
    Map<Fut, OkFn<Never>>: FusedFuture,

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

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

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

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

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

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::Item>,

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

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

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

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

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

impl<St, Fut, T, F> FusedFuture for Fold<St, Fut, T, F>where
    St: Stream,
    F: FnMut(T, St::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::Ok) -> Fut,
    Fut: TryFuture<Ok = T, Error = St::Error>,

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

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

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

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

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

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

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

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

impl<T> FusedFuture for Pending<T>

impl<T> FusedFuture for Ready<T>

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

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

impl<T: ?Sized> FusedFuture for OwnedMutexLockFuture<T>