async_std::stream

Struct StepBy

Source 
pub struct StepBy<S> { /* private fields */ }
Expand description

A stream that steps a given amount of elements of another stream.

This struct is created by the step_by method on Stream. See its documentation for more.

Trait Implementations§

Source§

impl<S: Debug> Debug for StepBy<S>

Source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
Source§

impl<S> Stream for StepBy<S>
where S: Stream,

Source§

type Item = <S as Stream>::Item

Values yielded by the stream.
Source§

fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more
Source§

fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more
Source§

impl<'__pin, S> Unpin for StepBy<S>
where PinnedFieldsOf<__Origin<'__pin, S>>: Unpin,

Auto Trait Implementations§

§

impl<S> Freeze for StepBy<S>
where S: Freeze,

§

impl<S> RefUnwindSafe for StepBy<S>
where S: RefUnwindSafe,

§

impl<S> Send for StepBy<S>
where S: Send,

§

impl<S> Sync for StepBy<S>
where S: Sync,

§

impl<S> UnwindSafe for StepBy<S>
where S: UnwindSafe,

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<I> IntoStream for I
where I: Stream,

Source§

type Item = <I as Stream>::Item

Available on unstable only.
The type of the elements being iterated over.
Source§

type IntoStream = I

Available on unstable only.
Which kind of stream are we turning this into?
Source§

fn into_stream(self) -> I

Available on unstable only.
Creates a stream from a value.
Source§

impl<S> StreamExt for S
where S: Stream + ?Sized,

Source§

fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>
where Self: Unpin,

A convenience for calling Stream::poll_next() on !Unpin types.
Source§

fn next(&mut self) -> NextFuture<'_, Self> ⓘ
where Self: Unpin,

Retrieves the next item in the stream. Read more
Source§

fn try_next<T, E>(&mut self) -> TryNextFuture<'_, Self> ⓘ
where Self: Stream<Item = Result<T, E>> + Unpin,

Retrieves the next item in the stream. Read more
Source§

fn count(self) -> CountFuture<Self> ⓘ
where Self: Sized,

Counts the number of items in the stream. Read more
Source§

fn map<T, F>(self, f: F) -> Map<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> T,

Maps items of the stream to new values using a closure. Read more
Source§

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where Self: Sized, U: Stream, F: FnMut(Self::Item) -> U,

Maps items to streams and then concatenates them. Read more
Source§

fn flatten(self) -> Flatten<Self>
where Self: Sized, Self::Item: Stream,

Concatenates inner streams. Read more
Source§

fn then<F, Fut>(self, f: F) -> Then<Self, F, Fut>
where Self: Sized, F: FnMut(Self::Item) -> Fut, Fut: Future,

Maps items of the stream to new values using an async closure. Read more
Source§

fn filter<P>(self, predicate: P) -> Filter<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Keeps items of the stream for which predicate returns true. Read more
Source§

fn filter_map<T, F>(self, f: F) -> FilterMap<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> Option<T>,

Filters and maps items of the stream using a closure. Read more
Source§

fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Takes only the first n items of the stream. Read more
Source§

fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Takes items while predicate returns true. Read more
Source§

fn map_while<B, P>(self, predicate: P) -> MapWhile<Self, P>
where Self: Sized, P: FnMut(Self::Item) -> Option<B>,

Maps items while predicate returns Some. Read more
Source§

fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Skips the first n items of the stream. Read more
Source§

fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Skips items while predicate returns true. Read more
Source§

fn step_by(self, step: usize) -> StepBy<Self>
where Self: Sized,

Yields every stepth item. Read more
Source§

fn chain<U>(self, other: U) -> Chain<Self, U>
where Self: Sized, U: Stream<Item = Self::Item>,

Appends another stream to the end of this one. Read more
Source§

fn cloned<'a, T>(self) -> Cloned<Self>
where Self: Sized + Stream<Item = &'a T>, T: Clone + 'a,

Clones all items. Read more
Source§

fn copied<'a, T>(self) -> Copied<Self>
where Self: Sized + Stream<Item = &'a T>, T: Copy + 'a,

Copies all items. Read more
Source§

fn collect<C>(self) -> CollectFuture<Self, C> ⓘ
where Self: Sized, C: Default + Extend<Self::Item>,

Collects all items in the stream into a collection. Read more
Source§

fn try_collect<T, E, C>(self) -> TryCollectFuture<Self, C> ⓘ
where Self: Sized + Stream<Item = Result<T, E>>, C: Default + Extend<T>,

Collects all items in the fallible stream into a collection. Read more
Source§

fn partition<B, P>(self, predicate: P) -> PartitionFuture<Self, P, B> ⓘ
where Self: Sized, B: Default + Extend<Self::Item>, P: FnMut(&Self::Item) -> bool,

Partitions items into those for which predicate is true and those for which it is false, and then collects them into two collections. Read more
Source§

fn fold<T, F>(self, init: T, f: F) -> FoldFuture<Self, F, T> ⓘ
where Self: Sized, F: FnMut(T, Self::Item) -> T,

Accumulates a computation over the stream. Read more
Source§

fn try_fold<T, E, F, B>( &mut self, init: B, f: F, ) -> TryFoldFuture<'_, Self, F, B> ⓘ
where Self: Sized + Stream<Item = Result<T, E>> + Unpin, F: FnMut(B, T) -> Result<B, E>,

Accumulates a fallible computation over the stream. Read more
Source§

fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>
where Self: Sized, F: FnMut(&mut St, Self::Item) -> Option<B>,

Maps items of the stream to new values using a state value and a closure. Read more
Source§

fn fuse(self) -> Fuse<Self>
where Self: Sized,

Fuses the stream so that it stops yielding items after the first None. Read more
Source§

fn cycle(self) -> Cycle<Self>
where Self: Sized + Clone,

Repeats the stream from beginning to end, forever. Read more
Source§

fn enumerate(self) -> Enumerate<Self>
where Self: Sized,

Enumerates items, mapping them to (index, item). Read more
Source§

fn inspect<F>(self, f: F) -> Inspect<Self, F>
where Self: Sized, F: FnMut(&Self::Item),

Calls a closure on each item and passes it on. Read more
Source§

fn nth(&mut self, n: usize) -> NthFuture<'_, Self> ⓘ
where Self: Unpin,

Gets the nth item of the stream. Read more
Source§

fn last(self) -> LastFuture<Self> ⓘ
where Self: Sized,

Returns the last item in the stream. Read more
Source§

fn find<P>(&mut self, predicate: P) -> FindFuture<'_, Self, P> ⓘ
where Self: Unpin, P: FnMut(&Self::Item) -> bool,

Finds the first item of the stream for which predicate returns true. Read more
Source§

fn find_map<F, B>(&mut self, f: F) -> FindMapFuture<'_, Self, F> ⓘ
where Self: Unpin, F: FnMut(Self::Item) -> Option<B>,

Applies a closure to items in the stream and returns the first Some result. Read more
Source§

fn position<P>(&mut self, predicate: P) -> PositionFuture<'_, Self, P> ⓘ
where Self: Unpin, P: FnMut(Self::Item) -> bool,

Finds the index of the first item of the stream for which predicate returns true. Read more
Source§

fn all<P>(&mut self, predicate: P) -> AllFuture<'_, Self, P> ⓘ
where Self: Unpin, P: FnMut(Self::Item) -> bool,

Tests if predicate returns true for all items in the stream. Read more
Source§

fn any<P>(&mut self, predicate: P) -> AnyFuture<'_, Self, P> ⓘ
where Self: Unpin, P: FnMut(Self::Item) -> bool,

Tests if predicate returns true for any item in the stream. Read more
Source§

fn for_each<F>(self, f: F) -> ForEachFuture<Self, F> ⓘ
where Self: Sized, F: FnMut(Self::Item),

Calls a closure on each item of the stream. Read more
Source§

fn try_for_each<F, E>(&mut self, f: F) -> TryForEachFuture<'_, Self, F> ⓘ
where Self: Unpin, F: FnMut(Self::Item) -> Result<(), E>,

Calls a fallible closure on each item of the stream, stopping on first error. Read more
Source§

fn zip<U>(self, other: U) -> Zip<Self, U>
where Self: Sized, U: Stream,

Zips up two streams into a single stream of pairs. Read more
Source§

fn unzip<A, B, FromA, FromB>(self) -> UnzipFuture<Self, FromA, FromB> ⓘ
where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Stream<Item = (A, B)>,

Collects a stream of pairs into a pair of collections. Read more
Source§

fn or<S>(self, other: S) -> Or<Self, S>
where Self: Sized, S: Stream<Item = Self::Item>,

Merges with other stream, preferring items from self whenever both streams are ready. Read more
Source§

fn race<S>(self, other: S) -> Race<Self, S>
where Self: Sized, S: Stream<Item = Self::Item>,

Merges with other stream, with no preference for either stream when both are ready. Read more
Source§

fn drain(&mut self) -> Drain<'_, Self>

Yields all immediately available values from a stream. Read more
Source§

fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
where Self: Sized + Send + 'a,

Boxes the stream and changes its type to dyn Stream + Send + 'a. Read more
Source§

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a>>
where Self: Sized + 'a,

Boxes the stream and changes its type to dyn Stream + 'a. Read more
Source§

impl<T> StreamExt for T
where T: Stream + ?Sized,

Source§

fn next(&mut self) -> NextFuture<'_, Self>
where Self: Unpin,

Advances the stream and returns the next value. Read more
Source§

fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Creates a stream that yields its first n elements. Read more
Source§

fn take_while<P>(self, predicate: P) -> TakeWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates a stream that yields elements based on a predicate. Read more
Source§

fn throttle(self, d: Duration) -> Throttle<Self>
where Self: Sized,

Available on unstable only.
Limit the amount of items yielded per timeslice in a stream. Read more
Source§

fn step_by(self, step: usize) -> StepBy<Self>
where Self: Sized,

Creates a stream that yields each stepth element. Read more
Source§

fn chain<U>(self, other: U) -> Chain<Self, U>
where Self: Sized, U: Stream<Item = Self::Item> + Sized,

Takes two streams and creates a new stream over both in sequence. Read more
Source§

fn cloned<'a, T>(self) -> Cloned<Self>
where Self: Sized + Stream<Item = &'a T>, T: Clone + 'a,

Creates an stream which copies all of its elements. Read more
Source§

fn copied<'a, T>(self) -> Copied<Self>
where Self: Sized + Stream<Item = &'a T>, T: Copy + 'a,

Creates an stream which copies all of its elements. Read more
Source§

fn cycle(self) -> Cycle<Self>
where Self: Clone + Sized,

Creates a stream that yields the provided values infinitely and in order. Read more
Source§

fn enumerate(self) -> Enumerate<Self>
where Self: Sized,

Creates a stream that gives the current element’s count as well as the next value. Read more
Source§

fn delay(self, dur: Duration) -> Delay<Self>
where Self: Sized,

Available on unstable only.
Creates a stream that is delayed before it starts yielding items. Read more
Source§

fn map<B, F>(self, f: F) -> Map<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> B,

Takes a closure and creates a stream that calls that closure on every element of this stream. Read more
Source§

fn inspect<F>(self, f: F) -> Inspect<Self, F>
where Self: Sized, F: FnMut(&Self::Item),

A combinator that does something with each element in the stream, passing the value on. Read more
Source§

fn last(self) -> LastFuture<Self, Self::Item>
where Self: Sized,

Returns the last element of the stream. Read more
Source§

fn fuse(self) -> Fuse<Self>
where Self: Sized,

Creates a stream which ends after the first None. Read more
Source§

fn filter<P>(self, predicate: P) -> Filter<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Creates a stream that uses a predicate to determine if an element should be yielded. Read more
Source§

fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where Self: Sized, U: IntoStream, F: FnMut(Self::Item) -> U,

Available on unstable only.
Creates an stream that works like map, but flattens nested structure. Read more
Source§

fn flatten(self) -> Flatten<Self>
where Self: Sized, Self::Item: IntoStream,

Available on unstable only.
Creates an stream that flattens nested structure. Read more
Source§

fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
where Self: Sized, F: FnMut(Self::Item) -> Option<B>,

Both filters and maps a stream. Read more
Source§

fn min_by_key<B, F>(self, key_by: F) -> MinByKeyFuture<Self, Self::Item, F>
where Self: Sized, B: Ord, F: FnMut(&Self::Item) -> B,

Returns the element that gives the minimum value with respect to the specified key function. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn max_by_key<B, F>(self, key_by: F) -> MaxByKeyFuture<Self, Self::Item, F>
where Self: Sized, B: Ord, F: FnMut(&Self::Item) -> B,

Returns the element that gives the maximum value with respect to the specified key function. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn min_by<F>(self, compare: F) -> MinByFuture<Self, F, Self::Item>
where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the minimum value with respect to the specified comparison function. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn max(self) -> MaxFuture<Self, Self::Item>
where Self: Sized, Self::Item: Ord,

Returns the element that gives the maximum value. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn min(self) -> MinFuture<Self, Self::Item>
where Self: Sized, Self::Item: Ord,

Returns the element that gives the minimum value. If several elements are equally minimum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn max_by<F>(self, compare: F) -> MaxByFuture<Self, F, Self::Item>
where Self: Sized, F: FnMut(&Self::Item, &Self::Item) -> Ordering,

Returns the element that gives the maximum value with respect to the specified comparison function. If several elements are equally maximum, the first element is returned. If the stream is empty, None is returned. Read more
Source§

fn nth(&mut self, n: usize) -> NthFuture<'_, Self>
where Self: Unpin + Sized,

Returns the nth element of the stream. Read more
Source§

fn all<F>(&mut self, f: F) -> AllFuture<'_, Self, F, Self::Item>
where Self: Unpin + Sized, F: FnMut(Self::Item) -> bool,

Tests if every element of the stream matches a predicate. Read more
Source§

fn find<P>(&mut self, p: P) -> FindFuture<'_, Self, P>
where Self: Unpin + Sized, P: FnMut(&Self::Item) -> bool,

Searches for an element in a stream that satisfies a predicate. Read more
Source§

fn find_map<F, B>(&mut self, f: F) -> FindMapFuture<'_, Self, F>
where Self: Unpin + Sized, F: FnMut(Self::Item) -> Option<B>,

Applies function to the elements of stream and returns the first non-none result. Read more
Source§

fn fold<B, F>(self, init: B, f: F) -> FoldFuture<Self, F, B>
where Self: Sized, F: FnMut(B, Self::Item) -> B,

A combinator that applies a function to every element in a stream producing a single, final value. Read more
Source§

fn partition<B, F>(self, f: F) -> PartitionFuture<Self, F, B>
where Self: Sized, F: FnMut(&Self::Item) -> bool, B: Default + Extend<Self::Item>,

Available on unstable only.
A combinator that applies a function to every element in a stream creating two collections from it. Read more
Source§

fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>
where Self: Sized, F: FnMut(Self::Item),

Call a closure on each element of the stream. Read more
Source§

fn any<F>(&mut self, f: F) -> AnyFuture<'_, Self, F, Self::Item>
where Self: Unpin + Sized, F: FnMut(Self::Item) -> bool,

Tests if any element of the stream matches a predicate. Read more
Source§

fn by_ref(&mut self) -> &mut Self

Available on unstable only.
Borrows an stream, rather than consuming it. Read more
Source§

fn scan<St, B, F>(self, initial_state: St, f: F) -> Scan<Self, St, F>
where Self: Sized, F: FnMut(&mut St, Self::Item) -> Option<B>,

A stream adaptor similar to fold that holds internal state and produces a new stream. Read more
Source§

fn skip_while<P>(self, predicate: P) -> SkipWhile<Self, P>
where Self: Sized, P: FnMut(&Self::Item) -> bool,

Combinator that skips elements based on a predicate. Read more
Source§

fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Creates a combinator that skips the first n elements. Read more
Source§

fn timeout(self, dur: Duration) -> Timeout<Self>
where Self: Stream + Sized,

Available on unstable only.
Await a stream or times out after a duration of time. Read more
Source§

fn try_fold<B, F, T, E>( &mut self, init: T, f: F, ) -> TryFoldFuture<'_, Self, F, T>
where Self: Unpin + Sized, F: FnMut(B, Self::Item) -> Result<T, E>,

A combinator that applies a function as long as it returns successfully, producing a single, final value. Immediately returns the error when the function returns unsuccessfully. Read more
Source§

fn try_for_each<F, E>(&mut self, f: F) -> TryForEachFuture<'_, Self, F>
where Self: Unpin + Sized, F: FnMut(Self::Item) -> Result<(), E>,

Applies a falliable function to each element in a stream, stopping at first error and returning it. Read more
Source§

fn zip<U>(self, other: U) -> Zip<Self, U>
where Self: Sized, U: Stream,

‘Zips up’ two streams into a single stream of pairs. Read more
Source§

fn unzip<A, B, FromA, FromB>(self) -> UnzipFuture<Self, FromA, FromB>
where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Stream<Item = (A, B)> + Sized,

Available on unstable only.
Converts an stream of pairs into a pair of containers. Read more
Source§

fn collect<'a, B>(self) -> Pin<Box<dyn Future<Output = B> + Send + 'a>>
where Self: Sized + 'a + Send, B: FromStream<Self::Item>, Self::Item: Send,

Available on unstable only.
Transforms a stream into a collection. Read more
Source§

fn merge<U>(self, other: U) -> Merge<Self, U>
where Self: Sized, U: Stream<Item = Self::Item> + Sized,

Available on unstable only.
Combines multiple streams into a single stream of all their outputs. Read more
Source§

fn partial_cmp<S>(self, other: S) -> PartialCmpFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: PartialOrd<S::Item>,

Lexicographically compares the elements of this Stream with those of another. Read more
Source§

fn position<P>(&mut self, predicate: P) -> PositionFuture<'_, Self, P>
where Self: Unpin + Sized, P: FnMut(Self::Item) -> bool,

Searches for an element in a Stream that satisfies a predicate, returning its index. Read more
Source§

fn cmp<S>(self, other: S) -> CmpFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: Ord,

Lexicographically compares the elements of this Stream with those of another using ‘Ord’. Read more
Source§

fn count(self) -> CountFuture<Self>
where Self: Sized,

Available on unstable only.
Counts the number of elements in the stream. Read more
Source§

fn ne<S>(self, other: S) -> NeFuture<Self, S>
where Self: Sized, S: Sized + Stream, <Self as Stream>::Item: PartialEq<S::Item>,

Determines if the elements of this Stream are lexicographically not equal to those of another. Read more
Source§

fn ge<S>(self, other: S) -> GeFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: PartialOrd<S::Item>,

Determines if the elements of this Stream are lexicographically greater than or equal to those of another. Read more
Source§

fn eq<S>(self, other: S) -> EqFuture<Self, S>
where Self: Sized + Stream, S: Sized + Stream, <Self as Stream>::Item: PartialEq<S::Item>,

Determines if the elements of this Stream are lexicographically equal to those of another. Read more
Source§

fn gt<S>(self, other: S) -> GtFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: PartialOrd<S::Item>,

Determines if the elements of this Stream are lexicographically greater than those of another. Read more
Source§

fn le<S>(self, other: S) -> LeFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: PartialOrd<S::Item>,

Determines if the elements of this Stream are lexicographically less or equal to those of another. Read more
Source§

fn lt<S>(self, other: S) -> LtFuture<Self, S>
where Self: Sized + Stream, S: Stream, <Self as Stream>::Item: PartialOrd<S::Item>,

Determines if the elements of this Stream are lexicographically less than those of another. Read more
Source§

fn sum<'a, S>(self) -> Pin<Box<dyn Future<Output = S> + 'a>>
where Self: Sized + Stream<Item = S> + 'a, S: Sum<Self::Item>,

Available on unstable only.
Sums the elements of a stream. Read more
Source§

fn product<'a, P>(self) -> Pin<Box<dyn Future<Output = P> + 'a>>
where Self: Sized + Stream<Item = P> + 'a, P: Product,

Available on unstable only.
Multiplies all elements of the stream. Read more
Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

impl<S, T, E> TryStream for S
where S: Stream<Item = Result<T, E>> + ?Sized,

Source§

type Ok = T

The type of successful values yielded by this future
Source§

type Error = E

The type of failures yielded by this future
Source§

fn try_poll_next( self: Pin<&mut S>, cx: &mut Context<'_>, ) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

Poll this TryStream as if it were a Stream. Read more