Struct async_std::stream::Once

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pub struct Once<T> { /* private fields */ }

Expand description

A stream that yields a single item.

This stream is created by the once function. See its documentation for more.

Trait Implementations

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impl<T: Clone> Clone for Once<T>

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fn clone(&self) -> Once<T>

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<T: Debug> Debug for Once<T>

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

Formats the value using the given formatter. Read more

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impl<T> DoubleEndedStream for Once<T>

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

Attempts to receive the next item from the back of the stream. Read more

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

Advances the stream and returns the next value. Read more

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

Returns the nth element from the back of the stream. Read more

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

Returns the first element from the right that matches the predicate. Read more

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fn rfold<B, F>(self, accum: B, f: F) -> RFoldFuture<Self, F, B> where
Self: Sized,
F: FnMut(B, Self::Item) -> B,

Examples Read more

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fn try_rfold<B, F, E>(self, accum: B, f: F) -> TryRFoldFuture<Self, F, B> where
Self: Sized,
F: FnMut(B, Self::Item) -> Result<B, 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

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impl<T> Stream for Once<T>

type Item = T

Values yielded by the stream.

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fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<T>>

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

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

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

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impl<'pin, T> Unpin for Once<T> where
Origin<'__pin, T>: Unpin,

Auto Trait Implementations

impl<T> RefUnwindSafe for Once<T> where
T: RefUnwindSafe,

impl<T> Send for Once<T> where
T: Send,

impl<T> Sync for Once<T> where
T: Sync,

impl<T> UnwindSafe for Once<T> where
T: UnwindSafe,

Blanket Implementations

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · 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.

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

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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.

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fn next(&mut self) -> NextFuture<'_, Self>ⓘNotable traits for NextFuture<'_, S>`impl<'_, S> Future for NextFuture<'_, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>;` where
Self: Unpin,

Retrieves the next item in the stream. Read more

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fn try_next<T, E>(&mut self) -> TryNextFuture<'_, Self>ⓘNotable traits for TryNextFuture<'_, S>`impl<'_, T, E, S> Future for TryNextFuture<'_, S> where S: Stream<Item = Result<T, E>> + Unpin + ?Sized, type Output = Result<Option<T>, E>;` where
Self: Stream<Item = Result<T, E>> + Unpin,

Retrieves the next item in the stream. Read more

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fn count(self) -> CountFuture<Self>ⓘNotable traits for CountFuture<S>`impl<S> Future for CountFuture<S> where S: Stream + ?Sized, type Output = usize;`

Counts the number of items in the stream. Read more

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

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

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

Maps items to streams and then concatenates them. Read more

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

Concatenates inner streams. Read more

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

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

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

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

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

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

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

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

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

Takes items while predicate returns true. Read more

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

Skips the first n items of the stream. Read more

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

Skips items while predicate returns true. Read more

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

Yields every stepth item. Read more

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

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

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

Clones all items. Read more

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

Copies all items. Read more

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fn collect<C>(self) -> CollectFuture<Self, C>ⓘNotable traits for CollectFuture<S, C>`impl<S, C> Future for CollectFuture<S, C> where S: Stream, C: Default + Extend<<S as Stream>::Item>, type Output = C;` where
C: Default + Extend<Self::Item>,

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

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fn try_collect<T, E, C>(self) -> TryCollectFuture<Self, C>ⓘNotable traits for TryCollectFuture<S, C>`impl<T, E, S, C> Future for TryCollectFuture<S, C> where S: Stream<Item = Result<T, E>>, C: Default + Extend<T>, type Output = Result<C, E>;` where
 Self: Stream<Item = Result<T, E>>,
 C: Default + Extend<T>,

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

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fn partition<B, P>(self, predicate: P) -> PartitionFuture<Self, P, B>ⓘNotable traits for PartitionFuture<S, P, B>`impl<S, P, B> Future for PartitionFuture<S, P, B> where S: Stream, P: FnMut(&<S as Stream>::Item) -> bool, B: Default + Extend<<S as Stream>::Item>, type Output = (B, B);` where
 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

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fn fold<T, F>(self, init: T, f: F) -> FoldFuture<Self, F, T>ⓘNotable traits for FoldFuture<S, F, T>`impl<S, F, T> Future for FoldFuture<S, F, T> where S: Stream, F: FnMut(T, <S as Stream>::Item) -> T, type Output = T;` where
F: FnMut(T, Self::Item) -> T,

Accumulates a computation over the stream. Read more

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fn try_fold<T, E, F, B>(
 &mut self,
 init: B,
 f: F
) -> TryFoldFuture<'_, Self, F, B>ⓘNotable traits for TryFoldFuture<'a, S, F, B>`impl<'a, T, E, S, F, B> Future for TryFoldFuture<'a, S, F, B> where S: Stream<Item = Result<T, E>> + Unpin, F: FnMut(B, T) -> Result<B, E>, type Output = Result<B, E>;` where
 Self: Stream<Item = Result<T, E>> + Unpin,
 F: FnMut(B, T) -> Result<B, E>,

Accumulates a fallible computation over the stream. Read more

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

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

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fn fuse(self) -> Fuse<Self>

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

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

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

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fn enumerate(self) -> Enumerate<Self>

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

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

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

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fn nth(&mut self, n: usize) -> NthFuture<'_, Self>ⓘNotable traits for NthFuture<'a, S>`impl<'a, S> Future for NthFuture<'a, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>;` where
Self: Unpin,

Gets the nth item of the stream. Read more

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fn last(self) -> LastFuture<Self>ⓘNotable traits for LastFuture<S>`impl<S> Future for LastFuture<S> where S: Stream, type Output = Option<<S as Stream>::Item>;`

Returns the last item in the stream. Read more

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fn find(&mut self, predicate: P) -> FindFuture<'_, Self, P>ⓘNotable traits for FindFuture<'a, S, P>`impl<'a, S, P> Future for FindFuture<'a, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(&<S as Stream>::Item) -> bool, type Output = Option<<S as Stream>::Item>;` where
 Self: Unpin,
 P: FnMut(&Self::Item) -> bool,

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

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fn find_map<F, B>(&mut self, f: F) -> FindMapFuture<'_, Self, F>ⓘNotable traits for FindMapFuture<'a, S, F>`impl<'a, S, B, F> Future for FindMapFuture<'a, S, F> where S: Stream + Unpin + ?Sized, F: FnMut(<S as Stream>::Item) -> Option, type Output = Option;` where
 Self: Unpin,
 F: FnMut(Self::Item) -> Option,

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

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fn position(&mut self, predicate: P) -> PositionFuture<'_, Self, P>ⓘNotable traits for PositionFuture<'a, S, P>`impl<'a, S, P> Future for PositionFuture<'a, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = Option<usize>;` 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

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fn all(&mut self, predicate: P) -> AllFuture<'_, Self, P>ⓘNotable traits for AllFuture<'_, S, P>`impl<'_, S, P> Future for AllFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool;` where
 Self: Unpin,
 P: FnMut(Self::Item) -> bool,

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

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fn any(&mut self, predicate: P) -> AnyFuture<'_, Self, P>ⓘNotable traits for AnyFuture<'_, S, P>`impl<'_, S, P> Future for AnyFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool;` where
 Self: Unpin,
 P: FnMut(Self::Item) -> bool,

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

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fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>ⓘNotable traits for ForEachFuture<S, F>`impl<S, F> Future for ForEachFuture<S, F> where S: Stream, F: FnMut(<S as Stream>::Item), type Output = ();` where
F: FnMut(Self::Item),

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

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fn try_for_each<F, E>(&mut self, f: F) -> TryForEachFuture<'_, Self, F>ⓘNotable traits for TryForEachFuture<'a, S, F>`impl<'a, S, F, E> Future for TryForEachFuture<'a, S, F> where S: Stream + Unpin + ?Sized, F: FnMut(<S as Stream>::Item) -> Result<(), E>, type Output = Result<(), E>;` 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

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

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

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fn unzip<A, B, FromA, FromB>(self) -> UnzipFuture<Self, FromA, FromB>ⓘNotable traits for UnzipFuture<S, FromA, FromB>`impl<S, A, B, FromA, FromB> Future for UnzipFuture<S, FromA, FromB> where S: Stream<Item = (A, B)>, FromA: Default + Extend<A>, FromB: Default + Extend, type Output = (FromA, FromB);` where
 FromA: Default + Extend<A>,
 FromB: Default + Extend,
 Self: Stream<Item = (A, B)>,

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

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

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

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

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

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fn boxed<'a>(
 self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin`impl Future for Pin where P: DerefMut, ::Target: Future, type Output = <::Target as Future>::Output;` where
 Self: 'a + Send,

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

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fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin`impl Future for Pin where P: DerefMut, ::Target: Future, type Output = <::Target as Future>::Output;` where
Self: 'a,

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

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

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fn clone_into(&self, target: &mut T)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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

type Ok = T

The type of successful values yielded by this future

type Error = E

The type of failures yielded by this future

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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

Struct async_std::stream::Once

Trait Implementations

impl<T: Clone> Clone for Once<T>

fn clone(&self) -> Once<T>

fn clone_from(&mut self, source: &Self)

impl<T: Debug> Debug for Once<T>

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

impl<T> DoubleEndedStream for Once<T>

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

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

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

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

fn rfold<B, F>(self, accum: B, f: F) -> RFoldFuture<Self, F, B> where Self: Sized, F: FnMut(B, Self::Item) -> B,

fn try_rfold<B, F, E>(self, accum: B, f: F) -> TryRFoldFuture<Self, F, B> where Self: Sized, F: FnMut(B, Self::Item) -> Result<B, E>,

impl<T> Stream for Once<T>

type Item = T

fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<T>>

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

impl<'__pin, T> Unpin for Once<T> where __Origin<'__pin, T>: Unpin,

Auto Trait Implementations

impl<T> RefUnwindSafe for Once<T> where T: RefUnwindSafe,

impl<T> Send for Once<T> where T: Send,

impl<T> Sync for Once<T> where T: Sync,

impl<T> UnwindSafe for Once<T> where T: UnwindSafe,

Blanket Implementations

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

fn type_id(&self) -> TypeId

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

fn borrow(&self) -> &T

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

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

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

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

fn next(&mut self) -> NextFuture<'_, Self>ⓘNotable traits for NextFuture<'_, S>impl<'_, S> Future for NextFuture<'_, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>; where Self: Unpin,

fn try_next<T, E>(&mut self) -> TryNextFuture<'_, Self>ⓘNotable traits for TryNextFuture<'_, S>impl<'_, T, E, S> Future for TryNextFuture<'_, S> where S: Stream<Item = Result<T, E>> + Unpin + ?Sized, type Output = Result<Option<T>, E>; where Self: Stream<Item = Result<T, E>> + Unpin,

fn count(self) -> CountFuture<Self>ⓘNotable traits for CountFuture<S>impl<S> Future for CountFuture<S> where S: Stream + ?Sized, type Output = usize;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn collect<C>(self) -> CollectFuture<Self, C>ⓘNotable traits for CollectFuture<S, C>impl<S, C> Future for CollectFuture<S, C> where S: Stream, C: Default + Extend<<S as Stream>::Item>, type Output = C; where C: Default + Extend<Self::Item>,

fn fold<T, F>(self, init: T, f: F) -> FoldFuture<Self, F, T>ⓘNotable traits for FoldFuture<S, F, T>impl<S, F, T> Future for FoldFuture<S, F, T> where S: Stream, F: FnMut(T, <S as Stream>::Item) -> T, type Output = T; where F: FnMut(T, Self::Item) -> T,

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

fn fuse(self) -> Fuse<Self>

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

fn enumerate(self) -> Enumerate<Self>

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

fn nth(&mut self, n: usize) -> NthFuture<'_, Self>ⓘNotable traits for NthFuture<'a, S>impl<'a, S> Future for NthFuture<'a, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>; where Self: Unpin,

fn last(self) -> LastFuture<Self>ⓘNotable traits for LastFuture<S>impl<S> Future for LastFuture<S> where S: Stream, type Output = Option<<S as Stream>::Item>;

fn all<P>(&mut self, predicate: P) -> AllFuture<'_, Self, P>ⓘNotable traits for AllFuture<'_, S, P>impl<'_, S, P> Future for AllFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool; where Self: Unpin, P: FnMut(Self::Item) -> bool,

fn any<P>(&mut self, predicate: P) -> AnyFuture<'_, Self, P>ⓘNotable traits for AnyFuture<'_, S, P>impl<'_, S, P> Future for AnyFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool; where Self: Unpin, P: FnMut(Self::Item) -> bool,

fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>ⓘNotable traits for ForEachFuture<S, F>impl<S, F> Future for ForEachFuture<S, F> where S: Stream, F: FnMut(<S as Stream>::Item), type Output = (); where F: FnMut(Self::Item),

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

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

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

fn boxed<'a>( self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output; where Self: 'a + Send,

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin<P>impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output; where Self: 'a,

impl<T> ToOwned for T where T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

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

type Error = Infallible

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

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

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

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

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

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

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

fn rfold<B, F>(self, accum: B, f: F) -> RFoldFuture<Self, F, B> where
Self: Sized,
F: FnMut(B, Self::Item) -> B,

fn try_rfold<B, F, E>(self, accum: B, f: F) -> TryRFoldFuture<Self, F, B> where
Self: Sized,
F: FnMut(B, Self::Item) -> Result<B, E>,

impl<'pin, T> Unpin for Once<T> where
Origin<'__pin, T>: Unpin,

impl<T> RefUnwindSafe for Once<T> where
T: RefUnwindSafe,

impl<T> Send for Once<T> where
T: Send,

impl<T> Sync for Once<T> where
T: Sync,

impl<T> UnwindSafe for Once<T> where
T: UnwindSafe,

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

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

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

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

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

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

fn next(&mut self) -> NextFuture<'_, Self>ⓘNotable traits for NextFuture<'_, S>`impl<'_, S> Future for NextFuture<'_, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>;` where
Self: Unpin,

fn try_next<T, E>(&mut self) -> TryNextFuture<'_, Self>ⓘNotable traits for TryNextFuture<'_, S>`impl<'_, T, E, S> Future for TryNextFuture<'_, S> where S: Stream<Item = Result<T, E>> + Unpin + ?Sized, type Output = Result<Option<T>, E>;` where
Self: Stream<Item = Result<T, E>> + Unpin,

fn count(self) -> CountFuture<Self>ⓘNotable traits for CountFuture<S>`impl<S> Future for CountFuture<S> where S: Stream + ?Sized, type Output = usize;`

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

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

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

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

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

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

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

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

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

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

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

fn collect<C>(self) -> CollectFuture<Self, C>ⓘNotable traits for CollectFuture<S, C>`impl<S, C> Future for CollectFuture<S, C> where S: Stream, C: Default + Extend<<S as Stream>::Item>, type Output = C;` where
C: Default + Extend<Self::Item>,

fn fold<T, F>(self, init: T, f: F) -> FoldFuture<Self, F, T>ⓘNotable traits for FoldFuture<S, F, T>`impl<S, F, T> Future for FoldFuture<S, F, T> where S: Stream, F: FnMut(T, <S as Stream>::Item) -> T, type Output = T;` where
F: FnMut(T, Self::Item) -> T,

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

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

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

fn nth(&mut self, n: usize) -> NthFuture<'_, Self>ⓘNotable traits for NthFuture<'a, S>`impl<'a, S> Future for NthFuture<'a, S> where S: Stream + Unpin + ?Sized, type Output = Option<<S as Stream>::Item>;` where
Self: Unpin,

fn last(self) -> LastFuture<Self>ⓘNotable traits for LastFuture<S>`impl<S> Future for LastFuture<S> where S: Stream, type Output = Option<<S as Stream>::Item>;`

fn all<P>(&mut self, predicate: P) -> AllFuture<'_, Self, P>ⓘNotable traits for AllFuture<'_, S, P>`impl<'_, S, P> Future for AllFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool;` where
Self: Unpin,
P: FnMut(Self::Item) -> bool,

fn any<P>(&mut self, predicate: P) -> AnyFuture<'_, Self, P>ⓘNotable traits for AnyFuture<'_, S, P>`impl<'_, S, P> Future for AnyFuture<'_, S, P> where S: Stream + Unpin + ?Sized, P: FnMut(<S as Stream>::Item) -> bool, type Output = bool;` where
Self: Unpin,
P: FnMut(Self::Item) -> bool,

fn for_each<F>(self, f: F) -> ForEachFuture<Self, F>ⓘNotable traits for ForEachFuture<S, F>`impl<S, F> Future for ForEachFuture<S, F> where S: Stream, F: FnMut(<S as Stream>::Item), type Output = ();` where
F: FnMut(Self::Item),

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

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

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

fn boxed<'a>(
self
) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a, Global>>ⓘNotable traits for Pin<P>`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;` where
Self: 'a + Send,

fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a, Global>>ⓘNotable traits for Pin<P>`impl<P> Future for Pin<P> where P: DerefMut, <P as Deref>::Target: Future, type Output = <<P as Deref>::Target as Future>::Output;` where
Self: 'a,

impl<T> ToOwned for T where
T: Clone,

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

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

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

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