Trait futures::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.

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Implementations on Foreign Types

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

impl<F> FusedFuture for Box<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

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Implementors

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

impl<Fut> FusedFuture for NeverError<Fut> where
    Fut: FusedFuture, 

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

impl<Fut> FusedFuture for UnitError<Fut> where
    Fut: FusedFuture, 

fn is_terminated(&self) -> bool

impl<Fut, E> FusedFuture for ErrInto<Fut, E> where
    Fut: TryFuture + FusedFuture,
    <Fut as TryFuture>::Error: Into<E>, 

fn is_terminated(&self) -> bool

impl<Fut, F> FusedFuture for Inspect<Fut, F> where
    F: FnOnce(&<Fut as Future>::Output),
    Fut: FusedFuture, 

fn is_terminated(&self) -> bool

impl<Fut, F> FusedFuture for InspectErr<Fut, F> where
    F: FnOnce(&<Fut as TryFuture>::Error),
    Fut: TryFuture + FusedFuture, 

fn is_terminated(&self) -> bool

impl<Fut, F> FusedFuture for InspectOk<Fut, F> where
    F: FnOnce(&<Fut as TryFuture>::Ok),
    Fut: TryFuture + FusedFuture, 

fn is_terminated(&self) -> bool

impl<Fut, F> FusedFuture for UnwrapOrElse<Fut, F> where
    F: FnOnce(<Fut as TryFuture>::Error) -> <Fut as TryFuture>::Ok,
    Fut: TryFuture, 

fn is_terminated(&self) -> bool

impl<Fut, F, E> FusedFuture for MapErr<Fut, F> where
    F: FnOnce(<Fut as TryFuture>::Error) -> E,
    Fut: TryFuture, 

fn is_terminated(&self) -> bool

impl<Fut, F, T> FusedFuture for Map<Fut, F> where
    F: FnOnce(<Fut as Future>::Output) -> T,
    Fut: Future, 

fn is_terminated(&self) -> bool

impl<Fut, F, T> FusedFuture for MapOk<Fut, F> where
    F: FnOnce(<Fut as TryFuture>::Ok) -> T,
    Fut: TryFuture, 

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

impl<Fut1, Fut2, F> FusedFuture for AndThen<Fut1, Fut2, F> where
    F: FnOnce(<Fut1 as TryFuture>::Ok) -> Fut2,
    Fut1: TryFuture,
    Fut2: TryFuture<Error = <Fut1 as TryFuture>::Error>, 

fn is_terminated(&self) -> bool

impl<Fut1, Fut2, F> FusedFuture for OrElse<Fut1, Fut2, F> where
    F: FnOnce(<Fut1 as TryFuture>::Error) -> Fut2,
    Fut1: TryFuture,
    Fut2: TryFuture<Ok = <Fut1 as TryFuture>::Ok>, 

fn is_terminated(&self) -> bool

impl<Fut1, Fut2, F> FusedFuture for Then<Fut1, Fut2, F> where
    F: FnOnce(<Fut1 as Future>::Output) -> Fut2,
    Fut1: Future,
    Fut2: Future, 

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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, 

fn is_terminated(&self) -> bool

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, 

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

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

fn is_terminated(&self) -> bool

impl<St, Fut, T, F> FusedFuture 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, 

fn is_terminated(&self) -> bool

impl<St, Si, Item, E> FusedFuture for Forward<St, Si> where
    Si: Sink<Item, Error = E>,
    St: Stream<Item = Result<Item, E>>, 

fn is_terminated(&self) -> bool

impl<T> FusedFuture for Pending<T>

fn is_terminated(&self) -> bool

impl<T> FusedFuture for Ready<T>

fn is_terminated(&self) -> bool

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