[][src]Struct tokio::prelude::stream::Peekable

#[must_use = "streams do nothing unless polled"]
pub struct Peekable<S> where
    S: Stream
{ /* fields omitted */ }

A Stream that implements a peek method.

The peek method can be used to retrieve a reference to the next Stream::Item if available. A subsequent call to poll will return the owned item.

Methods

impl<S> Peekable<S> where
    S: Stream
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pub fn peek(
    &mut self
) -> Result<Async<Option<&<S as Stream>::Item>>, <S as Stream>::Error>
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Peek retrieves a reference to the next item in the stream.

This method polls the underlying stream and return either a reference to the next item if the stream is ready or passes through any errors.

Trait Implementations

impl<S> Stream for Peekable<S> where
    S: Stream
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type Item = <S as Stream>::Item

The type of item this stream will yield on success.

type Error = <S as Stream>::Error

The type of error this stream may generate.

impl<S> Sink for Peekable<S> where
    S: Sink + Stream
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type SinkItem = <S as Sink>::SinkItem

The type of value that the sink accepts.

type SinkError = <S as Sink>::SinkError

The type of value produced by the sink when an error occurs.

impl<S> Debug for Peekable<S> where
    S: Stream + Debug,
    <S as Stream>::Item: Debug
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Auto Trait Implementations

impl<S> Send for Peekable<S> where
    S: Send,
    <S as Stream>::Item: Send

impl<S> Unpin for Peekable<S> where
    S: Unpin,
    <S as Stream>::Item: Unpin

impl<S> Sync for Peekable<S> where
    S: Sync,
    <S as Stream>::Item: Sync

impl<S> UnwindSafe for Peekable<S> where
    S: UnwindSafe,
    <S as Stream>::Item: UnwindSafe

impl<S> RefUnwindSafe for Peekable<S> where
    S: RefUnwindSafe,
    <S as Stream>::Item: 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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