futures_rx::stream_ext::pairwise

Struct Pairwise

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pub struct Pairwise<S: Stream> { /* private fields */ }
Expand description

Stream for the pairwise method.

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impl<S> FusedStream for Pairwise<S>
where S: FusedStream,

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fn is_terminated(&self) -> bool

Returns true if the stream should no longer be polled.
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impl<S> Stream for Pairwise<S>
where S: Stream,

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type Item = (<S as Stream>::Item, Event<<S as Stream>::Item>)

Values yielded by the stream.
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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
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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, S: Stream> Unpin for Pairwise<S>
where PinnedFieldsOf<__Origin<'__pin, S>>: Unpin,

Auto Trait Implementations§

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

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

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impl<S> !Send for Pairwise<S>

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impl<S> !Sync for Pairwise<S>

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

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,

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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,

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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

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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<T> RxExt for T
where T: Stream + ?Sized,

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

Starts polling itself as well as the provided other Stream. The first one to emit an event “wins” and proceeds to emit all its next events. The “loser” is discarded and will not be polled further. Read more
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fn start_with<I: IntoIterator<Item = Self::Item>>( self, iter: I, ) -> StartWith<Self>
where Self: Sized,

Precedes all emitted events with the items of an iter. Read more
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fn end_with<I: IntoIterator<Item = Self::Item>>(self, iter: I) -> EndWith<Self>
where Self: Sized,

Follows all emitted events with the items of an iter. Read more
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fn share(self) -> Shared<Self, PublishSubject<Self::Item>>
where Self: Sized,

Transforms a Stream into a broadcast one, which can be subscribed to more than once, after cloning the shared version. Read more
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fn share_behavior(self) -> Shared<Self, BehaviorSubject<Self::Item>>
where Self: Sized,

Transforms a Stream into a broadcast one, which can be subscribed to more than once, after cloning the shared version. Read more
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fn share_replay(self) -> Shared<Self, ReplaySubject<Self::Item>>
where Self: Sized,

Transforms a Stream into a broadcast one, which can be subscribed to more than once, after cloning the shared version. Read more
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fn switch_map<S: Stream, F: FnMut(Self::Item) -> S>( self, f: F, ) -> SwitchMap<Self, S, F>
where Self: Sized,

Like flat_map, except that switched Stream is interrupted when the parent Stream emits a next event. Read more
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fn pairwise(self) -> Pairwise<Self>
where Self: Sized,

Emits pairs of the previous and next events as a tuple. Read more
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fn debounce<Fut: Future, F: Fn(&Self::Item) -> Fut>( self, f: F, ) -> Debounce<Self, Fut, F>
where Self: Sized,

Delays events using a debounce time window. The event will emit when this window closes and when no other event was emitted while this window was open. Read more
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fn throttle<Fut: Future, F: Fn(&Self::Item) -> Fut>( self, f: F, ) -> Throttle<Self, Fut, F>
where Self: Sized,

Creates a new interval from the closure, whenever a new event is emitted from the parent Stream. This event is immediately emitted, however for as long as the interval is now open, no subsequent events will be emitted. Read more
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fn buffer<Fut: Future<Output = bool>, F: Fn(&Self::Item, usize) -> Fut>( self, f: F, ) -> Buffer<Self, Fut, F>
where Self: Sized,

Creates chunks of buffered data. Read more
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fn window<Fut: Future<Output = bool>, F: Fn(&Self::Item, usize) -> Fut>( self, f: F, ) -> Window<Self, Fut, F>
where Self: Sized,

Creates chunks of buffered data as new Streams. Read more
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fn distinct(self) -> Distinct<Self>
where Self: Sized, Self::Item: Hash,

Ensures that all emitted events are unique. Events are required to implement Hash. Read more
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fn distinct_until_changed(self) -> DistinctUntilChanged<Self>
where Self: Sized, Self::Item: Hash,

Ensures that all emitted events are unique within immediate sequence. Events are required to implement Hash. Read more
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fn materialize(self) -> Materialize<Self>
where Self: Sized,

Converts all events of a Stream into Notification events. When the Stream is done, it will first emit a final Notification::Complete event. Read more
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fn dematerialize<T>(self) -> Dematerialize<Self, T>
where Self: Stream<Item = Notification<T>> + Sized,

The inverse of materialize. Use this transformer to translate a Stream emitting Notification events back into a Stream emitting original events. Read more
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fn delay<Fut: Future, F: Fn() -> Fut>(self, f: F) -> Delay<Self, Fut, F>
where Self: Sized,

Delays emitting events using an initial time window, provided by a closure. Read more
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fn with_latest_from<S: Stream>( self, stream: S, ) -> CombineLatest2<Self, S, Self::Item, S::Item>
where Self: Sized, Self::Item: ToOwned<Owned = Self::Item>, S::Item: ToOwned<Owned = S::Item>,

Acts just like a CombineLatest2, where every next event is a tuple pair containing the last emitted events from both Streams. Read more
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impl<T> StreamExt for T
where T: Stream + ?Sized,

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

Creates a future that resolves to the next item in the stream. Read more
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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
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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
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fn enumerate(self) -> Enumerate<Self>
where Self: Sized,

Creates a stream which gives the current iteration count as well as the next value. Read more
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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
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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
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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
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fn collect<C>(self) -> Collect<Self, C>
where C: Default + Extend<Self::Item>, Self: Sized,

Transforms a stream into a collection, returning a future representing the result of that computation. Read more
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fn unzip<A, B, FromA, FromB>(self) -> Unzip<Self, FromA, FromB>
where FromA: Default + Extend<A>, FromB: Default + Extend<B>, Self: Sized + Stream<Item = (A, B)>,

Converts a stream of pairs into a future, which resolves to pair of containers. Read more
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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
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fn count(self) -> Count<Self>
where Self: Sized,

Drives the stream to completion, counting the number of items. Read more
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fn cycle(self) -> Cycle<Self>
where Self: Sized + Clone,

Repeats a stream endlessly. Read more
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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
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fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Execute predicate over asynchronous stream, and return true if any element in stream satisfied a predicate. Read more
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fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Execute predicate over asynchronous stream, and return true if all element in stream satisfied a predicate. Read more
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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
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fn flatten_unordered( self, limit: impl Into<Option<usize>>, ) -> FlattenUnorderedWithFlowController<Self, ()>
where Self::Item: Stream + Unpin, Self: Sized,

Flattens a stream of streams into just one continuous stream. Polls inner streams produced by the base stream concurrently. Read more
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where F: FnMut(Self::Item) -> U, U: Stream, Self: Sized,

Maps a stream like StreamExt::map but flattens nested Streams. Read more
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fn flat_map_unordered<U, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> FlatMapUnordered<Self, U, F>
where U: Stream + Unpin, F: FnMut(Self::Item) -> U, Self: Sized,

Maps a stream like StreamExt::map but flattens nested Streams and polls them concurrently, yielding items in any order, as they made available. Read more
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fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>
where F: FnMut(&mut S, Self::Item) -> Fut, Fut: Future<Output = Option<B>>, Self: Sized,

Combinator similar to StreamExt::fold that holds internal state and produces a new stream. Read more
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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
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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
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fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>
where Fut: Future, Self: Sized,

Take elements from this stream until the provided future resolves. Read more
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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
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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
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fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Creates a new stream of at most n items of the underlying stream. Read more
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fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Creates a new stream which skips n items of the underlying stream. Read more
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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 to turn any Stream into a FusedStream. Read more
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fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it. Read more
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fn catch_unwind(self) -> CatchUnwind<Self>
where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream. Read more
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fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
where Self: Sized + Send + 'a,

Wrap the stream in a Box, pinning it. Read more
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fn boxed_local<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + 'a>>
where Self: Sized + 'a,

Wrap the stream in a Box, pinning it. Read more
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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
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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
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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
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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 streams. Read more
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fn peekable(self) -> Peekable<Self>
where Self: Sized,

Creates a new stream which exposes a peek method. Read more
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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
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fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up ready items of the stream inside a vector. Read more
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fn forward<S>(self, sink: S) -> Forward<Self, S>
where S: Sink<Self::Ok, Error = Self::Error>, Self: Sized + TryStream,

A future that completes after the given stream has been fully processed into the sink and the sink has been flushed and closed. Read more
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fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>)
where Self: Sized + Sink<Item>,

Splits this Stream + Sink object into separate Sink and Stream objects. Read more
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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
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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
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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
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fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>
where Self: Unpin,

A convenience method for calling Stream::poll_next on Unpin stream types.
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fn select_next_some(&mut self) -> SelectNextSome<'_, Self>
where Self: Unpin + FusedStream,

Returns a Future that resolves when the next item in this stream is ready. Read more
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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.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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

Performs the conversion.