[−][src]Struct futures_util::stream::FuturesUnordered
A set of futures which may complete in any order.
This structure is optimized to manage a large number of futures.
Futures managed by FuturesUnordered will only be polled when they
generate wake-up notifications. This reduces the required amount of work
needed to poll large numbers of futures.
FuturesUnordered can be filled by collecting an
iterator of futures into a FuturesUnordered, or by
pushing futures onto an existing
FuturesUnordered. When new futures are added,
poll_next must be called in order to begin receiving
wake-ups for new futures.
Note that you can create a ready-made FuturesUnordered via the
futures_unordered function, or you can start with
an empty set with the FuturesUnordered::new constructor.
Methods
impl<Fut: Future> FuturesUnordered<Fut>[src]
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impl<Fut: Future> FuturesUnordered<Fut>pub fn new() -> FuturesUnordered<Fut>[src]
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pub fn new() -> FuturesUnordered<Fut>Constructs a new, empty FuturesUnordered.
The returned FuturesUnordered does not contain any futures.
In this state, FuturesUnordered::poll_next will
return Poll::Ready(None).
impl<Fut> FuturesUnordered<Fut>[src]
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impl<Fut> FuturesUnordered<Fut>pub fn len(&self) -> usize[src]
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pub fn len(&self) -> usizeReturns the number of futures contained in the set.
This represents the total number of in-flight futures.
pub fn is_empty(&self) -> bool[src]
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pub fn is_empty(&self) -> boolReturns true if the set contains no futures.
pub fn push(&mut self, future: Fut)[src]
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pub fn push(&mut self, future: Fut)Push a future into the set.
This method adds the given future to the set. This method will not
call poll on the submitted future. The caller must
ensure that FuturesUnordered::poll_next is called
in order to receive wake-up notifications for the given future.
pub fn iter_mut(&mut self) -> IterMut<Fut> where
Fut: Unpin, [src]
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pub fn iter_mut(&mut self) -> IterMut<Fut> where
Fut: Unpin, Returns an iterator that allows modifying each future in the set.
pub fn iter_pin_mut<'a>(self: Pin<&'a mut Self>) -> IterPinMut<'a, Fut>[src]
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pub fn iter_pin_mut<'a>(self: Pin<&'a mut Self>) -> IterPinMut<'a, Fut>Returns an iterator that allows modifying each future in the set.
Trait Implementations
impl<Fut: Send> Send for FuturesUnordered<Fut>[src]
impl<Fut: Send> Send for FuturesUnordered<Fut>impl<Fut: Future> Default for FuturesUnordered<Fut>[src]
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impl<Fut: Future> Default for FuturesUnordered<Fut>impl<Fut> Drop for FuturesUnordered<Fut>[src]
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impl<Fut> Drop for FuturesUnordered<Fut>impl<Fut: Sync> Sync for FuturesUnordered<Fut>[src]
impl<Fut: Sync> Sync for FuturesUnordered<Fut>impl<Fut> Debug for FuturesUnordered<Fut>[src]
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impl<Fut> Debug for FuturesUnordered<Fut>impl<Fut> Unpin for FuturesUnordered<Fut>[src]
impl<Fut> Unpin for FuturesUnordered<Fut>impl<Fut: Future> FromIterator<Fut> for FuturesUnordered<Fut>[src]
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impl<Fut: Future> FromIterator<Fut> for FuturesUnordered<Fut>impl<Fut: Future> Stream for FuturesUnordered<Fut>[src]
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impl<Fut: Future> Stream for FuturesUnordered<Fut>impl<Fut: Future> FusedStream for FuturesUnordered<Fut>[src]
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impl<Fut: Future> FusedStream for FuturesUnordered<Fut>impl<'a> Spawn for FuturesUnordered<FutureObj<'a, ()>>[src]
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impl<'a> Spawn for FuturesUnordered<FutureObj<'a, ()>>impl<'a> LocalSpawn for FuturesUnordered<LocalFutureObj<'a, ()>>[src]
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impl<'a> LocalSpawn for FuturesUnordered<LocalFutureObj<'a, ()>>Blanket Implementations
impl<T> StreamExt for T where
T: Stream + ?Sized, [src]
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impl<T> StreamExt for T where
T: Stream + ?Sized, fn next(&mut self) -> Next<Self> where
Self: Sized + Unpin, [src]
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fn next(&mut self) -> Next<Self> where
Self: Sized + Unpin, Creates a future that resolves to the next item in the stream. Read more
fn into_future(self) -> StreamFuture<Self> where
Self: Sized + Unpin, [src]
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fn into_future(self) -> StreamFuture<Self> where
Self: Sized + Unpin, Converts this stream into a future of (next_item, tail_of_stream). If the stream terminates, then the next item is None. Read more
fn map<T, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> T,
Self: Sized, [src]
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fn map<T, F>(self, f: F) -> Map<Self, F> where
F: FnMut(Self::Item) -> T,
Self: Sized, Maps this stream's items to a different type, returning a new stream of the resulting type. Read more
fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, [src]
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fn filter<Fut, F>(self, f: F) -> Filter<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, Filters the values produced by this stream according to the provided asynchronous predicate. Read more
fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,
Self: Sized, [src]
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fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = Option<T>>,
Self: Sized, Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future,
Self: Sized, [src]
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fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future,
Self: Sized, Computes from this stream's items new items of a different type using an asynchronous closure. Read more
fn collect<C: Default + Extend<Self::Item>>(self) -> Collect<Self, C> where
Self: Sized, [src]
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fn collect<C: Default + Extend<Self::Item>>(self) -> Collect<Self, C> where
Self: Sized, Collect all of the values of this stream into a vector, returning a future representing the result of that computation. Read more
fn concat(self) -> Concat<Self> where
Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default, [src]
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fn concat(self) -> Concat<Self> where
Self: Sized,
Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default, Concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,
Self: Sized, [src]
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fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F> where
F: FnMut(T, Self::Item) -> Fut,
Fut: Future<Output = T>,
Self: Sized, Execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
fn flatten(self) -> Flatten<Self> where
Self::Item: Stream,
Self: Sized, [src]
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fn flatten(self) -> Flatten<Self> where
Self::Item: Stream,
Self: Sized, Flattens a stream of streams into just one continuous stream. Read more
fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, [src]
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fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, [src]
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fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F> where
F: FnMut(&Self::Item) -> Fut,
Fut: Future<Output = bool>,
Self: Sized, Take elements from this stream while the provided asynchronous predicate resolves to true. Read more
fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized, [src]
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fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized, Runs this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized, [src]
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fn for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> ForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Item) -> Fut,
Fut: Future<Output = ()>,
Self: Sized, Runs this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available. Read more
fn take(self, n: u64) -> Take<Self> where
Self: Sized, [src]
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fn take(self, n: u64) -> Take<Self> where
Self: Sized, Creates a new stream of at most n items of the underlying stream. Read more
fn skip(self, n: u64) -> Skip<Self> where
Self: Sized, [src]
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fn skip(self, n: u64) -> Skip<Self> where
Self: Sized, Creates a new stream which skips n items of the underlying stream. Read more
fn fuse(self) -> Fuse<Self> where
Self: Sized, [src]
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fn fuse(self) -> Fuse<Self> where
Self: Sized, Fuse a stream such that poll_next will never again be called once it has finished. This method can be used t turn any Stream into a FusedStream. Read more
ⓘImportant traits for &'_ mut Ifn by_ref(&mut self) -> &mut Self where
Self: Sized, [src]
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fn by_ref(&mut self) -> &mut Self where
Self: Sized, Borrows a stream, rather than consuming it. Read more
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: Sized + UnwindSafe, [src]
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fn catch_unwind(self) -> CatchUnwind<Self> where
Self: Sized + UnwindSafe, Catches unwinding panics while polling the stream. Read more
fn boxed(self) -> Pin<Box<Self>> where
Self: Sized, [src]
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fn boxed(self) -> Pin<Box<Self>> where
Self: Sized, Wrap the stream in a Box, pinning it.
fn buffered(self, n: usize) -> Buffered<Self> where
Self::Item: Future,
Self: Sized, [src]
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fn buffered(self, n: usize) -> Buffered<Self> where
Self::Item: Future,
Self: Sized, An adaptor for creating a buffered list of pending futures. Read more
fn buffer_unordered(self, n: usize) -> BufferUnordered<Self> where
Self::Item: Future,
Self: Sized, [src]
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fn buffer_unordered(self, n: usize) -> BufferUnordered<Self> where
Self::Item: Future,
Self: Sized, An adaptor for creating a buffered list of pending futures (unordered). Read more
fn zip<St>(self, other: St) -> Zip<Self, St> where
St: Stream,
Self: Sized, [src]
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fn zip<St>(self, other: St) -> Zip<Self, St> where
St: Stream,
Self: Sized, An adapter for zipping two streams together. Read more
fn chain<St>(self, other: St) -> Chain<Self, St> where
St: Stream<Item = Self::Item>,
Self: Sized, [src]
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fn chain<St>(self, other: St) -> Chain<Self, St> where
St: Stream<Item = Self::Item>,
Self: Sized, Adapter for chaining two stream. Read more
fn peekable(self) -> Peekable<Self> where
Self: Sized, [src]
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fn peekable(self) -> Peekable<Self> where
Self: Sized, Creates a new stream which exposes a peek method. Read more
fn chunks(self, capacity: usize) -> Chunks<Self> where
Self: Sized, [src]
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fn chunks(self, capacity: usize) -> Chunks<Self> where
Self: Sized, An adaptor for chunking up items of the stream inside a vector. Read more
fn select<St>(self, other: St) -> Select<Self, St> where
St: Stream<Item = Self::Item>,
Self: Sized, [src]
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fn select<St>(self, other: St) -> Select<Self, St> where
St: Stream<Item = Self::Item>,
Self: Sized, This combinator will attempt to pull items from both streams. Each stream will be polled in a round-robin fashion, and whenever a stream is ready to yield an item that item is yielded. Read more
fn forward<S>(self, sink: S) -> Forward<Self, S> where
S: Sink + Unpin,
Self: Stream<Item = Result<S::SinkItem, S::SinkError>> + Sized, [src]
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fn forward<S>(self, sink: S) -> Forward<Self, S> where
S: Sink + Unpin,
Self: Stream<Item = Result<S::SinkItem, S::SinkError>> + Sized, A future that completes after the given stream has been fully processed into the sink, including flushing. Read more
fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where
Self: Sink + Sized, [src]
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fn split(self) -> (SplitSink<Self>, SplitStream<Self>) where
Self: Sink + Sized, Splits this Stream + Sink object into separate Stream and Sink objects. Read more
fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),
Self: Sized, [src]
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fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnMut(&Self::Item),
Self: Sized, Do something with each item of this stream, afterwards passing it on. Read more
ⓘImportant traits for Either<L, R>fn left_stream<B>(self) -> Either<Self, B> where
B: Stream<Item = Self::Item>,
Self: Sized, [src]
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fn left_stream<B>(self) -> Either<Self, B> where
B: Stream<Item = Self::Item>,
Self: Sized, Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
ⓘImportant traits for Either<L, R>fn right_stream<B>(self) -> Either<B, Self> where
B: Stream<Item = Self::Item>,
Self: Sized, [src]
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fn right_stream<B>(self) -> Either<B, Self> where
B: Stream<Item = Self::Item>,
Self: Sized, Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
fn poll_next_unpin(&mut self, lw: &LocalWaker) -> Poll<Option<Self::Item>> where
Self: Unpin + Sized, [src]
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fn poll_next_unpin(&mut self, lw: &LocalWaker) -> Poll<Option<Self::Item>> where
Self: Unpin + Sized, A convenience method for calling Stream::poll_next on Unpin stream types. Read more
fn select_next_some(&mut self) -> SelectNextSome<Self> where
Self: Sized + Unpin + FusedStream, [src]
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fn select_next_some(&mut self) -> SelectNextSome<Self> where
Self: Sized + Unpin + FusedStream, impl<S> TryStreamExt for S where
S: TryStream, [src]
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impl<S> TryStreamExt for S where
S: TryStream, fn err_into<E>(self) -> ErrInto<Self, E> where
Self: Sized,
Self::Error: Into<E>, [src]
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fn err_into<E>(self) -> ErrInto<Self, E> where
Self: Sized,
Self::Error: Into<E>, Wraps the current stream in a new stream which converts the error type into the one provided. Read more
fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
Self: Sized,
F: FnMut(Self::Ok) -> T, [src]
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fn map_ok<T, F>(self, f: F) -> MapOk<Self, F> where
Self: Sized,
F: FnMut(Self::Ok) -> T, Wraps the current stream in a new stream which maps the success value using the provided closure. Read more
fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
Self: Sized,
F: FnMut(Self::Error) -> E, [src]
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fn map_err<E, F>(self, f: F) -> MapErr<Self, F> where
Self: Sized,
F: FnMut(Self::Error) -> E, Wraps the current stream in a new stream which maps the error value using the provided closure. Read more
fn into_stream(self) -> IntoStream<Self> where
Self: Sized, [src]
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fn into_stream(self) -> IntoStream<Self> where
Self: Sized, fn try_next(&mut self) -> TryNext<Self> where
Self: Sized + Unpin, [src]
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fn try_next(&mut self) -> TryNext<Self> where
Self: Sized + Unpin, Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>,
Self: Sized, [src]
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fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: TryFuture<Ok = (), Error = Self::Error>,
Self: Sized, Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,
Self: Sized, [src]
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fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F> where
F: FnMut(&Self::Ok) -> Fut,
Fut: TryFuture<Ok = bool, Error = Self::Error>,
Self: Sized, Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
fn try_for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> TryForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: Future<Output = Result<(), Self::Error>>,
Self: Sized, [src]
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fn try_for_each_concurrent<Fut, F>(
self,
limit: impl Into<Option<usize>>,
f: F
) -> TryForEachConcurrent<Self, Fut, F> where
F: FnMut(Self::Ok) -> Fut,
Fut: Future<Output = Result<(), Self::Error>>,
Self: Sized, Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more
fn try_collect<C: Default + Extend<Self::Ok>>(self) -> TryCollect<Self, C> where
Self: Sized, [src]
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fn try_collect<C: Default + Extend<Self::Ok>>(self) -> TryCollect<Self, C> where
Self: Sized, Attempt to Collect all of the values of this stream into a vector, returning a future representing the result of that computation. Read more
fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F> where
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>,
F: FnMut(Self::Ok) -> Fut,
Self: Sized, [src]
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fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F> where
Fut: TryFuture<Ok = Option<T>, Error = Self::Error>,
F: FnMut(Self::Ok) -> Fut,
Self: Sized, Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F> where
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>,
Self: Sized, [src]
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fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F> where
F: FnMut(T, Self::Ok) -> Fut,
Fut: TryFuture<Ok = T, Error = Self::Error>,
Self: Sized, Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
fn try_concat(self) -> TryConcat<Self> where
Self: Sized,
Self::Ok: Extend<<Self::Ok as IntoIterator>::Item> + IntoIterator + Default, [src]
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fn try_concat(self) -> TryConcat<Self> where
Self: Sized,
Self::Ok: Extend<<Self::Ok as IntoIterator>::Item> + IntoIterator + Default, Attempt to concatenate all items of a stream into a single extendable destination, returning a future representing the end result. Read more
fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self> where
Self::Ok: TryFuture<Error = Self::Error>,
Self: Sized, [src]
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fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self> where
Self::Ok: TryFuture<Error = Self::Error>,
Self: Sized, Attempt to execute several futures from a stream concurrently. Read more
ⓘImportant traits for Compat<R>fn compat(self) -> Compat<Self> where
Self: Sized + Unpin, [src]
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fn compat(self) -> Compat<Self> where
Self: Sized + Unpin, impl<T> From for T[src]
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impl<T> From for Timpl<T, U> Into for T where
U: From<T>, [src]
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impl<T, U> Into for T where
U: From<T>, impl<T, U> TryFrom for T where
T: From<U>, [src]
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impl<T, U> TryFrom for T where
T: From<U>, type Error = !
try_from)The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>impl<T> Borrow for T where
T: ?Sized, [src]
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impl<T> Borrow for T where
T: ?Sized, impl<T> Any for T where
T: 'static + ?Sized, [src]
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impl<T> Any for T where
T: 'static + ?Sized, fn get_type_id(&self) -> TypeId[src]
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fn get_type_id(&self) -> TypeIdimpl<T, U> TryInto for T where
U: TryFrom<T>, [src]
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impl<T, U> TryInto for T where
U: TryFrom<T>, type Error = <U as TryFrom<T>>::Error
try_from)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>impl<T> BorrowMut for T where
T: ?Sized, [src]
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impl<T> BorrowMut for T where
T: ?Sized, ⓘImportant traits for &'_ mut Ifn borrow_mut(&mut self) -> &mut T[src]
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fn borrow_mut(&mut self) -> &mut Timpl<S, T, E> TryStream for S where
S: Stream<Item = Result<T, E>>, [src]
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impl<S, T, E> TryStream for S where
S: Stream<Item = Result<T, E>>,