[−][src]Struct futures::stream::Peekable
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: Stream> Peekable<S>
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pub fn peek(&mut self) -> Poll<Option<&S::Item>, S::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> Stream for Peekable<S>
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type Item = S::Item
The type of item this stream will yield on success.
type Error = S::Error
The type of error this stream may generate.
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error>
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ⓘImportant traits for Wait<S>fn wait(self) -> Wait<Self> where
Self: Sized,
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ⓘImportant traits for Wait<S>
Self: Sized,
fn into_future(self) -> StreamFuture<Self> where
Self: Sized,
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Self: Sized,
fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> U,
Self: Sized,
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F: FnMut(Self::Item) -> U,
Self: Sized,
fn map_err<U, F>(self, f: F) -> MapErr<Self, F> where
F: FnMut(Self::Error) -> U,
Self: Sized,
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F: FnMut(Self::Error) -> U,
Self: Sized,
fn filter<F>(self, f: F) -> Filter<Self, F> where
F: FnMut(&Self::Item) -> bool,
Self: Sized,
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F: FnMut(&Self::Item) -> bool,
Self: Sized,
fn filter_map<F, B>(self, f: F) -> FilterMap<Self, F> where
F: FnMut(Self::Item) -> Option<B>,
Self: Sized,
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F: FnMut(Self::Item) -> Option<B>,
Self: Sized,
fn then<F, U>(self, f: F) -> Then<Self, F, U> where
F: FnMut(Result<Self::Item, Self::Error>) -> U,
U: IntoFuture,
Self: Sized,
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F: FnMut(Result<Self::Item, Self::Error>) -> U,
U: IntoFuture,
Self: Sized,
fn and_then<F, U>(self, f: F) -> AndThen<Self, F, U> where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Error = Self::Error>,
Self: Sized,
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F: FnMut(Self::Item) -> U,
U: IntoFuture<Error = Self::Error>,
Self: Sized,
fn or_else<F, U>(self, f: F) -> OrElse<Self, F, U> where
F: FnMut(Self::Error) -> U,
U: IntoFuture<Item = Self::Item>,
Self: Sized,
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F: FnMut(Self::Error) -> U,
U: IntoFuture<Item = Self::Item>,
Self: Sized,
fn collect(self) -> Collect<Self> where
Self: Sized,
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Self: Sized,
fn concat2(self) -> Concat2<Self> where
Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,
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Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,
fn concat(self) -> Concat<Self> where
Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator,
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Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator,
fn fold<F, T, Fut>(self, init: T, f: F) -> Fold<Self, F, Fut, T> where
F: FnMut(T, Self::Item) -> Fut,
Fut: IntoFuture<Item = T>,
Self::Error: From<Fut::Error>,
Self: Sized,
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F: FnMut(T, Self::Item) -> Fut,
Fut: IntoFuture<Item = T>,
Self::Error: From<Fut::Error>,
Self: Sized,
fn flatten(self) -> Flatten<Self> where
Self::Item: Stream,
<Self::Item as Stream>::Error: From<Self::Error>,
Self: Sized,
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Self::Item: Stream,
<Self::Item as Stream>::Error: From<Self::Error>,
Self: Sized,
fn skip_while<P, R>(self, pred: P) -> SkipWhile<Self, P, R> where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
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P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
fn take_while<P, R>(self, pred: P) -> TakeWhile<Self, P, R> where
P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
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P: FnMut(&Self::Item) -> R,
R: IntoFuture<Item = bool, Error = Self::Error>,
Self: Sized,
fn for_each<F, U>(self, f: F) -> ForEach<Self, F, U> where
F: FnMut(Self::Item) -> U,
U: IntoFuture<Item = (), Error = Self::Error>,
Self: Sized,
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F: FnMut(Self::Item) -> U,
U: IntoFuture<Item = (), Error = Self::Error>,
Self: Sized,
fn from_err<E: From<Self::Error>>(self) -> FromErr<Self, E> where
Self: Sized,
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Self: Sized,
fn take(self, amt: u64) -> Take<Self> where
Self: Sized,
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Self: Sized,
fn skip(self, amt: u64) -> Skip<Self> where
Self: Sized,
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Self: Sized,
fn fuse(self) -> Fuse<Self> where
Self: Sized,
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Self: Sized,
fn by_ref(&mut self) -> &mut Self where
Self: Sized,
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Self: Sized,
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: Sized + UnwindSafe,
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Self: Sized + UnwindSafe,
fn buffered(self, amt: usize) -> Buffered<Self> where
Self::Item: IntoFuture<Error = Self::Error>,
Self: Sized,
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Self::Item: IntoFuture<Error = Self::Error>,
Self: Sized,
fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self> where
Self::Item: IntoFuture<Error = Self::Error>,
Self: Sized,
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Self::Item: IntoFuture<Error = Self::Error>,
Self: Sized,
fn merge<S>(self, other: S) -> Merge<Self, S> where
S: Stream<Error = Self::Error>,
Self: Sized,
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S: Stream<Error = Self::Error>,
Self: Sized,
fn zip<S>(self, other: S) -> Zip<Self, S> where
S: Stream<Error = Self::Error>,
Self: Sized,
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S: Stream<Error = Self::Error>,
Self: Sized,
fn chain<S>(self, other: S) -> Chain<Self, S> where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
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S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn peekable(self) -> Peekable<Self> where
Self: Sized,
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Self: Sized,
fn chunks(self, capacity: usize) -> Chunks<Self> where
Self: Sized,
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Self: Sized,
fn select<S>(self, other: S) -> Select<Self, S> where
S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
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S: Stream<Item = Self::Item, Error = Self::Error>,
Self: Sized,
fn forward<S>(self, sink: S) -> Forward<Self, S> where
S: Sink<SinkItem = Self::Item>,
Self::Error: From<S::SinkError>,
Self: Sized,
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S: Sink<SinkItem = Self::Item>,
Self::Error: From<S::SinkError>,
Self: Sized,
fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where
Self: Sink + Sized,
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Self: Sink + Sized,
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),
Self: Sized,
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F: FnMut(&Self::Item),
Self: Sized,
fn inspect_err<F>(self, f: F) -> InspectErr<Self, F> where
F: FnMut(&Self::Error),
Self: Sized,
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F: FnMut(&Self::Error),
Self: Sized,
impl<S> Sink for Peekable<S> where
S: Sink + Stream,
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S: Sink + Stream,
type SinkItem = S::SinkItem
The type of value that the sink accepts.
type SinkError = S::SinkError
The type of value produced by the sink when an error occurs.
fn start_send(
&mut self,
item: S::SinkItem
) -> StartSend<S::SinkItem, S::SinkError>
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&mut self,
item: S::SinkItem
) -> StartSend<S::SinkItem, S::SinkError>
fn poll_complete(&mut self) -> Poll<(), S::SinkError>
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fn close(&mut self) -> Poll<(), S::SinkError>
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fn wait(self) -> Wait<Self> where
Self: Sized,
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Self: Sized,
fn with<U, F, Fut>(self, f: F) -> With<Self, U, F, Fut> where
F: FnMut(U) -> Fut,
Fut: IntoFuture<Item = Self::SinkItem>,
Fut::Error: From<Self::SinkError>,
Self: Sized,
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F: FnMut(U) -> Fut,
Fut: IntoFuture<Item = Self::SinkItem>,
Fut::Error: From<Self::SinkError>,
Self: Sized,
fn with_flat_map<U, F, St>(self, f: F) -> WithFlatMap<Self, U, F, St> where
F: FnMut(U) -> St,
St: Stream<Item = Self::SinkItem, Error = Self::SinkError>,
Self: Sized,
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F: FnMut(U) -> St,
St: Stream<Item = Self::SinkItem, Error = Self::SinkError>,
Self: Sized,
fn sink_map_err<F, E>(self, f: F) -> SinkMapErr<Self, F> where
F: FnOnce(Self::SinkError) -> E,
Self: Sized,
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F: FnOnce(Self::SinkError) -> E,
Self: Sized,
fn sink_from_err<E: From<Self::SinkError>>(self) -> SinkFromErr<Self, E> where
Self: Sized,
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Self: Sized,
fn buffer(self, amt: usize) -> Buffer<Self> where
Self: Sized,
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Self: Sized,
fn fanout<S>(self, other: S) -> Fanout<Self, S> where
Self: Sized,
Self::SinkItem: Clone,
S: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>,
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Self: Sized,
Self::SinkItem: Clone,
S: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>,
fn flush(self) -> Flush<Self> where
Self: Sized,
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Self: Sized,
fn send(self, item: Self::SinkItem) -> Send<Self> where
Self: Sized,
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Self: Sized,
fn send_all<S>(self, stream: S) -> SendAll<Self, S> where
S: Stream<Item = Self::SinkItem>,
Self::SinkError: From<S::Error>,
Self: Sized,
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S: Stream<Item = Self::SinkItem>,
Self::SinkError: From<S::Error>,
Self: Sized,
impl<S: Debug + Stream> Debug for Peekable<S> where
S::Item: Debug,
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S::Item: Debug,
Auto Trait Implementations
impl<S> Unpin for Peekable<S> where
S: Unpin,
<S as Stream>::Item: Unpin,
S: Unpin,
<S as Stream>::Item: Unpin,
impl<S> Send for Peekable<S> where
S: Send,
<S as Stream>::Item: Send,
S: Send,
<S as Stream>::Item: Send,
impl<S> Sync for Peekable<S> where
S: Sync,
<S as Stream>::Item: Sync,
S: Sync,
<S as Stream>::Item: Sync,
impl<S> UnwindSafe for Peekable<S> where
S: UnwindSafe,
<S as Stream>::Item: UnwindSafe,
S: UnwindSafe,
<S as Stream>::Item: UnwindSafe,
impl<S> RefUnwindSafe for Peekable<S> where
S: RefUnwindSafe,
<S as Stream>::Item: RefUnwindSafe,
S: RefUnwindSafe,
<S as Stream>::Item: RefUnwindSafe,
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,