[][src]Struct futures::stream::Once

#[must_use = "streams do nothing unless polled"]
pub struct Once<Fut> { /* fields omitted */ }

A stream which emits single element and then EOF.

This stream will never block and is always ready.

Trait Implementations

impl<Fut> Stream for Once<Fut> where
    Fut: Future
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type Item = <Fut as Future>::Output

Values yielded by the stream.

impl<Fut> FusedStream for Once<Fut> where
    Fut: Future
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impl<Fut> Unpin for Once<Fut> where
    Fut: Unpin
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impl<Fut> Debug for Once<Fut> where
    Fut: Debug
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Auto Trait Implementations

impl<Fut> Send for Once<Fut> where
    Fut: Send

impl<Fut> Sync for Once<Fut> where
    Fut: Sync

impl<Fut> UnwindSafe for Once<Fut> where
    Fut: UnwindSafe

impl<Fut> RefUnwindSafe for Once<Fut> where
    Fut: RefUnwindSafe

Blanket Implementations

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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impl<S, T, E> TryStream for S where
    S: Stream<Item = Result<T, E>> + ?Sized
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type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

impl<T> StreamExt for T where
    T: Stream + ?Sized
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impl<S> TryStreamExt for S where
    S: TryStream + ?Sized
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