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 </pre><pre class="rust"><code><span class="kw">use </span>core::future::Future;
 <span class="kw">use </span>futures_core::Stream;

 <span class="kw">mod </span>all;
 <span class="kw">use </span>all::AllFuture;

 <span class="kw">mod </span>any;
 <span class="kw">use </span>any::AnyFuture;

 <span class="kw">mod </span>chain;
 <span class="kw">use </span>chain::Chain;

 <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>collect;
 <span class="kw">use </span>collect::{Collect, FromStream};

 <span class="kw">mod </span>filter;
 <span class="kw">use </span>filter::Filter;

 <span class="kw">mod </span>filter_map;
 <span class="kw">use </span>filter_map::FilterMap;

 <span class="kw">mod </span>fold;
 <span class="kw">use </span>fold::FoldFuture;

 <span class="kw">mod </span>fuse;
 <span class="kw">use </span>fuse::Fuse;

 <span class="kw">mod </span>map;
 <span class="kw">use </span>map::Map;

 <span class="kw">mod </span>map_while;
 <span class="kw">use </span>map_while::MapWhile;

 <span class="kw">mod </span>merge;
 <span class="kw">use </span>merge::Merge;

 <span class="kw">mod </span>next;
 <span class="kw">use </span>next::Next;

 <span class="kw">mod </span>skip;
 <span class="kw">use </span>skip::Skip;

 <span class="kw">mod </span>skip_while;
 <span class="kw">use </span>skip_while::SkipWhile;

 <span class="kw">mod </span>take;
 <span class="kw">use </span>take::Take;

 <span class="kw">mod </span>take_while;
 <span class="kw">use </span>take_while::TakeWhile;

 <span class="kw">mod </span>then;
 <span class="kw">use </span>then::Then;

 <span class="kw">mod </span>try_next;
 <span class="kw">use </span>try_next::TryNext;

 <span class="macro">cfg_time! </span>{
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>timeout;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>timeout_repeating;
     <span class="kw">use </span>timeout::Timeout;
     <span class="kw">use </span>timeout_repeating::TimeoutRepeating;
     <span class="kw">use </span>tokio::time::{Duration, Interval};
     <span class="kw">mod </span>throttle;
     <span class="kw">use </span>throttle::{throttle, Throttle};
     <span class="kw">mod </span>chunks_timeout;
     <span class="kw">use </span>chunks_timeout::ChunksTimeout;
 }

 <span class="doccomment">/// An extension trait for the [`Stream`] trait that provides a variety of
 /// convenient combinator functions.
 ///
 /// Be aware that the `Stream` trait in Tokio is a re-export of the trait found
 /// in the [futures] crate, however both Tokio and futures provide separate
 /// `StreamExt` utility traits, and some utilities are only available on one of
 /// these traits. Click [here][futures-StreamExt] to see the other `StreamExt`
 /// trait in the futures crate.
 ///
 /// If you need utilities from both `StreamExt` traits, you should prefer to
 /// import one of them, and use the other through the fully qualified call
 /// syntax. For example:
 /// ```
 /// // import one of the traits:
 /// use futures::stream::StreamExt;
 /// # #[tokio::main(flavor = &quot;current_thread&quot;)]
 /// # async fn main() {
 ///
 /// let a = tokio_stream::iter(vec![1, 3, 5]);
 /// let b = tokio_stream::iter(vec![2, 4, 6]);
 ///
 /// // use the fully qualified call syntax for the other trait:
 /// let merged = tokio_stream::StreamExt::merge(a, b);
 ///
 /// // use normal call notation for futures::stream::StreamExt::collect
 /// let output: Vec&lt;_&gt; = merged.collect().await;
 /// assert_eq!(output, vec![1, 2, 3, 4, 5, 6]);
 /// # }
 /// ```
 ///
 /// [`Stream`]: crate::Stream
 /// [futures]: https://docs.rs/futures
 /// [futures-StreamExt]: https://docs.rs/futures/0.3/futures/stream/trait.StreamExt.html
 </span><span class="kw">pub trait </span>StreamExt: Stream {
     <span class="doccomment">/// Consumes and returns the next value in the stream or `None` if the
     /// stream is finished.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn next(&amp;mut self) -&gt; Option&lt;Self::Item&gt;;
     /// ```
     ///
     /// Note that because `next` doesn&#39;t take ownership over the stream,
     /// the [`Stream`] type must be [`Unpin`]. If you want to use `next` with a
     /// [`!Unpin`](Unpin) stream, you&#39;ll first have to pin the stream. This can
     /// be done by boxing the stream using [`Box::pin`] or
     /// pinning it to the stack using the `pin_mut!` macro from the `pin_utils`
     /// crate.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. The returned future only
     /// holds onto a reference to the underlying stream,
     /// so dropping it will never lose a value.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let mut stream = stream::iter(1..=3);
     ///
     /// assert_eq!(stream.next().await, Some(1));
     /// assert_eq!(stream.next().await, Some(2));
     /// assert_eq!(stream.next().await, Some(3));
     /// assert_eq!(stream.next().await, None);
     /// # }
     /// ```
     </span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; Next&lt;<span class="lifetime">&#39;_</span>, <span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Unpin,
     {
         Next::new(<span class="self">self</span>)
     }

     <span class="doccomment">/// Consumes and returns the next item in the stream. If an error is
     /// encountered before the next item, the error is returned instead.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn try_next(&amp;mut self) -&gt; Result&lt;Option&lt;T&gt;, E&gt;;
     /// ```
     ///
     /// This is similar to the [`next`](StreamExt::next) combinator,
     /// but returns a [`Result&lt;Option&lt;T&gt;, E&gt;`](Result) rather than
     /// an [`Option&lt;Result&lt;T, E&gt;&gt;`](Option), making for easy use
     /// with the [`?`](std::ops::Try) operator.
     ///
     /// # Cancel safety
     ///
     /// This method is cancel safe. The returned future only
     /// holds onto a reference to the underlying stream,
     /// so dropping it will never lose a value.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let mut stream = stream::iter(vec![Ok(1), Ok(2), Err(&quot;nope&quot;)]);
     ///
     /// assert_eq!(stream.try_next().await, Ok(Some(1)));
     /// assert_eq!(stream.try_next().await, Ok(Some(2)));
     /// assert_eq!(stream.try_next().await, Err(&quot;nope&quot;));
     /// # }
     /// ```
     </span><span class="kw">fn </span>try_next&lt;T, E&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; TryNext&lt;<span class="lifetime">&#39;_</span>, <span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Stream&lt;Item = <span class="prelude-ty">Result</span>&lt;T, E&gt;&gt; + Unpin,
     {
         TryNext::new(<span class="self">self</span>)
     }

     <span class="doccomment">/// Maps this stream&#39;s items to a different type, returning a new stream of
     /// the resulting type.
     ///
     /// The provided closure is executed over all elements of this stream as
     /// they are made available. It is executed inline with calls to
     /// [`poll_next`](Stream::poll_next).
     ///
     /// Note that this function consumes the stream passed into it and returns a
     /// wrapped version of it, similar to the existing `map` methods in the
     /// standard library.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let stream = stream::iter(1..=3);
     /// let mut stream = stream.map(|x| x + 3);
     ///
     /// assert_eq!(stream.next().await, Some(4));
     /// assert_eq!(stream.next().await, Some(5));
     /// assert_eq!(stream.next().await, Some(6));
     /// # }
     /// ```
     </span><span class="kw">fn </span>map&lt;T, F&gt;(<span class="self">self</span>, f: F) -&gt; Map&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="self">Self</span>::Item) -&gt; T,
         <span class="self">Self</span>: Sized,
     {
         Map::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Map this stream&#39;s items to a different type for as long as determined by
     /// the provided closure. A stream of the target type will be returned,
     /// which will yield elements until the closure returns `None`.
     ///
     /// The provided closure is executed over all elements of this stream as
     /// they are made available, until it returns `None`. It is executed inline
     /// with calls to [`poll_next`](Stream::poll_next). Once `None` is returned,
     /// the underlying stream will not be polled again.
     ///
     /// Note that this function consumes the stream passed into it and returns a
     /// wrapped version of it, similar to the [`Iterator::map_while`] method in the
     /// standard library.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let stream = stream::iter(1..=10);
     /// let mut stream = stream.map_while(|x| {
     ///     if x &lt; 4 {
     ///         Some(x + 3)
     ///     } else {
     ///         None
     ///     }
     /// });
     /// assert_eq!(stream.next().await, Some(4));
     /// assert_eq!(stream.next().await, Some(5));
     /// assert_eq!(stream.next().await, Some(6));
     /// assert_eq!(stream.next().await, None);
     /// # }
     /// ```
     </span><span class="kw">fn </span>map_while&lt;T, F&gt;(<span class="self">self</span>, f: F) -&gt; MapWhile&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="self">Self</span>::Item) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt;,
         <span class="self">Self</span>: Sized,
     {
         MapWhile::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Maps this stream&#39;s items asynchronously to a different type, returning a
     /// new stream of the resulting type.
     ///
     /// The provided closure is executed over all elements of this stream as
     /// they are made available, and the returned future is executed. Only one
     /// future is executed at the time.
     ///
     /// Note that this function consumes the stream passed into it and returns a
     /// wrapped version of it, similar to the existing `then` methods in the
     /// standard library.
     ///
     /// Be aware that if the future is not `Unpin`, then neither is the `Stream`
     /// returned by this method. To handle this, you can use `tokio::pin!` as in
     /// the example below or put the stream in a `Box` with `Box::pin(stream)`.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// async fn do_async_work(value: i32) -&gt; i32 {
     ///     value + 3
     /// }
     ///
     /// let stream = stream::iter(1..=3);
     /// let stream = stream.then(do_async_work);
     ///
     /// tokio::pin!(stream);
     ///
     /// assert_eq!(stream.next().await, Some(4));
     /// assert_eq!(stream.next().await, Some(5));
     /// assert_eq!(stream.next().await, Some(6));
     /// # }
     /// ```
     </span><span class="kw">fn </span>then&lt;F, Fut&gt;(<span class="self">self</span>, f: F) -&gt; Then&lt;<span class="self">Self</span>, Fut, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="self">Self</span>::Item) -&gt; Fut,
         Fut: Future,
         <span class="self">Self</span>: Sized,
     {
         Then::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Combine two streams into one by interleaving the output of both as it
     /// is produced.
     ///
     /// Values are produced from the merged stream in the order they arrive from
     /// the two source streams. If both source streams provide values
     /// simultaneously, the merge stream alternates between them. This provides
     /// some level of fairness. You should not chain calls to `merge`, as this
     /// will break the fairness of the merging.
     ///
     /// The merged stream completes once **both** source streams complete. When
     /// one source stream completes before the other, the merge stream
     /// exclusively polls the remaining stream.
     ///
     /// For merging multiple streams, consider using [`StreamMap`] instead.
     ///
     /// [`StreamMap`]: crate::StreamMap
     ///
     /// # Examples
     ///
     /// ```
     /// use tokio_stream::{StreamExt, Stream};
     /// use tokio::sync::mpsc;
     /// use tokio::time;
     ///
     /// use std::time::Duration;
     /// use std::pin::Pin;
     ///
     /// # /*
     /// #[tokio::main]
     /// # */
     /// # #[tokio::main(flavor = &quot;current_thread&quot;)]
     /// async fn main() {
     /// # time::pause();
     ///     let (tx1, mut rx1) = mpsc::channel::&lt;usize&gt;(10);
     ///     let (tx2, mut rx2) = mpsc::channel::&lt;usize&gt;(10);
     ///
     ///     // Convert the channels to a `Stream`.
     ///     let rx1 = Box::pin(async_stream::stream! {
     ///           while let Some(item) = rx1.recv().await {
     ///               yield item;
     ///           }
     ///     }) as Pin&lt;Box&lt;dyn Stream&lt;Item = usize&gt; + Send&gt;&gt;;
     ///
     ///     let rx2 = Box::pin(async_stream::stream! {
     ///           while let Some(item) = rx2.recv().await {
     ///               yield item;
     ///           }
     ///     }) as Pin&lt;Box&lt;dyn Stream&lt;Item = usize&gt; + Send&gt;&gt;;
     ///
     ///     let mut rx = rx1.merge(rx2);
     ///
     ///     tokio::spawn(async move {
     ///         // Send some values immediately
     ///         tx1.send(1).await.unwrap();
     ///         tx1.send(2).await.unwrap();
     ///
     ///         // Let the other task send values
     ///         time::sleep(Duration::from_millis(20)).await;
     ///
     ///         tx1.send(4).await.unwrap();
     ///     });
     ///
     ///     tokio::spawn(async move {
     ///         // Wait for the first task to send values
     ///         time::sleep(Duration::from_millis(5)).await;
     ///
     ///         tx2.send(3).await.unwrap();
     ///
     ///         time::sleep(Duration::from_millis(25)).await;
     ///
     ///         // Send the final value
     ///         tx2.send(5).await.unwrap();
     ///     });
     ///
     ///    assert_eq!(1, rx.next().await.unwrap());
     ///    assert_eq!(2, rx.next().await.unwrap());
     ///    assert_eq!(3, rx.next().await.unwrap());
     ///    assert_eq!(4, rx.next().await.unwrap());
     ///    assert_eq!(5, rx.next().await.unwrap());
     ///
     ///    // The merged stream is consumed
     ///    assert!(rx.next().await.is_none());
     /// }
     /// ```
     </span><span class="kw">fn </span>merge&lt;U&gt;(<span class="self">self</span>, other: U) -&gt; Merge&lt;<span class="self">Self</span>, U&gt;
     <span class="kw">where
         </span>U: Stream&lt;Item = <span class="self">Self</span>::Item&gt;,
         <span class="self">Self</span>: Sized,
     {
         Merge::new(<span class="self">self</span>, other)
     }

     <span class="doccomment">/// Filters the values produced by this stream according to the provided
     /// predicate.
     ///
     /// As values of this stream are made available, the provided predicate `f`
     /// will be run against them. If the predicate
     /// resolves to `true`, then the stream will yield the value, but if the
     /// predicate resolves to `false`, then the value
     /// will be discarded and the next value will be produced.
     ///
     /// Note that this function consumes the stream passed into it and returns a
     /// wrapped version of it, similar to [`Iterator::filter`] method in the
     /// standard library.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let stream = stream::iter(1..=8);
     /// let mut evens = stream.filter(|x| x % 2 == 0);
     ///
     /// assert_eq!(Some(2), evens.next().await);
     /// assert_eq!(Some(4), evens.next().await);
     /// assert_eq!(Some(6), evens.next().await);
     /// assert_eq!(Some(8), evens.next().await);
     /// assert_eq!(None, evens.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>filter&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; Filter&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; bool,
         <span class="self">Self</span>: Sized,
     {
         Filter::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Filters the values produced by this stream while simultaneously mapping
     /// them to a different type according to the provided closure.
     ///
     /// As values of this stream are made available, the provided function will
     /// be run on them. If the predicate `f` resolves to
     /// [`Some(item)`](Some) then the stream will yield the value `item`, but if
     /// it resolves to [`None`], then the value will be skipped.
     ///
     /// Note that this function consumes the stream passed into it and returns a
     /// wrapped version of it, similar to [`Iterator::filter_map`] method in the
     /// standard library.
     ///
     /// # Examples
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let stream = stream::iter(1..=8);
     /// let mut evens = stream.filter_map(|x| {
     ///     if x % 2 == 0 { Some(x + 1) } else { None }
     /// });
     ///
     /// assert_eq!(Some(3), evens.next().await);
     /// assert_eq!(Some(5), evens.next().await);
     /// assert_eq!(Some(7), evens.next().await);
     /// assert_eq!(Some(9), evens.next().await);
     /// assert_eq!(None, evens.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>filter_map&lt;T, F&gt;(<span class="self">self</span>, f: F) -&gt; FilterMap&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="self">Self</span>::Item) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt;,
         <span class="self">Self</span>: Sized,
     {
         FilterMap::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Creates a stream which ends after the first `None`.
     ///
     /// After a stream returns `None`, behavior is undefined. Future calls to
     /// `poll_next` may or may not return `Some(T)` again or they may panic.
     /// `fuse()` adapts a stream, ensuring that after `None` is given, it will
     /// return `None` forever.
     ///
     /// # Examples
     ///
     /// ```
     /// use tokio_stream::{Stream, StreamExt};
     ///
     /// use std::pin::Pin;
     /// use std::task::{Context, Poll};
     ///
     /// // a stream which alternates between Some and None
     /// struct Alternate {
     ///     state: i32,
     /// }
     ///
     /// impl Stream for Alternate {
     ///     type Item = i32;
     ///
     ///     fn poll_next(mut self: Pin&lt;&amp;mut Self&gt;, _cx: &amp;mut Context&lt;&#39;_&gt;) -&gt; Poll&lt;Option&lt;i32&gt;&gt; {
     ///         let val = self.state;
     ///         self.state = self.state + 1;
     ///
     ///         // if it&#39;s even, Some(i32), else None
     ///         if val % 2 == 0 {
     ///             Poll::Ready(Some(val))
     ///         } else {
     ///             Poll::Ready(None)
     ///         }
     ///     }
     /// }
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let mut stream = Alternate { state: 0 };
     ///
     ///     // the stream goes back and forth
     ///     assert_eq!(stream.next().await, Some(0));
     ///     assert_eq!(stream.next().await, None);
     ///     assert_eq!(stream.next().await, Some(2));
     ///     assert_eq!(stream.next().await, None);
     ///
     ///     // however, once it is fused
     ///     let mut stream = stream.fuse();
     ///
     ///     assert_eq!(stream.next().await, Some(4));
     ///     assert_eq!(stream.next().await, None);
     ///
     ///     // it will always return `None` after the first time.
     ///     assert_eq!(stream.next().await, None);
     ///     assert_eq!(stream.next().await, None);
     ///     assert_eq!(stream.next().await, None);
     /// }
     /// ```
     </span><span class="kw">fn </span>fuse(<span class="self">self</span>) -&gt; Fuse&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         Fuse::new(<span class="self">self</span>)
     }

     <span class="doccomment">/// Creates a new stream of at most `n` items of the underlying stream.
     ///
     /// Once `n` items have been yielded from this stream then it will always
     /// return that the stream is done.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let mut stream = stream::iter(1..=10).take(3);
     ///
     /// assert_eq!(Some(1), stream.next().await);
     /// assert_eq!(Some(2), stream.next().await);
     /// assert_eq!(Some(3), stream.next().await);
     /// assert_eq!(None, stream.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>take(<span class="self">self</span>, n: usize) -&gt; Take&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         Take::new(<span class="self">self</span>, n)
     }

     <span class="doccomment">/// Take elements from this stream while the provided predicate
     /// resolves to `true`.
     ///
     /// This function, like `Iterator::take_while`, will take elements from the
     /// stream until the predicate `f` resolves to `false`. Once one element
     /// returns false it will always return that the stream is done.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let mut stream = stream::iter(1..=10).take_while(|x| *x &lt;= 3);
     ///
     /// assert_eq!(Some(1), stream.next().await);
     /// assert_eq!(Some(2), stream.next().await);
     /// assert_eq!(Some(3), stream.next().await);
     /// assert_eq!(None, stream.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>take_while&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; TakeWhile&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; bool,
         <span class="self">Self</span>: Sized,
     {
         TakeWhile::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Creates a new stream that will skip the `n` first items of the
     /// underlying stream.
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let mut stream = stream::iter(1..=10).skip(7);
     ///
     /// assert_eq!(Some(8), stream.next().await);
     /// assert_eq!(Some(9), stream.next().await);
     /// assert_eq!(Some(10), stream.next().await);
     /// assert_eq!(None, stream.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>skip(<span class="self">self</span>, n: usize) -&gt; Skip&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         Skip::new(<span class="self">self</span>, n)
     }

     <span class="doccomment">/// Skip elements from the underlying stream while the provided predicate
     /// resolves to `true`.
     ///
     /// This function, like [`Iterator::skip_while`], will ignore elements from the
     /// stream until the predicate `f` resolves to `false`. Once one element
     /// returns false, the rest of the elements will be yielded.
     ///
     /// [`Iterator::skip_while`]: std::iter::Iterator::skip_while()
     ///
     /// # Examples
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     /// let mut stream = stream::iter(vec![1,2,3,4,1]).skip_while(|x| *x &lt; 3);
     ///
     /// assert_eq!(Some(3), stream.next().await);
     /// assert_eq!(Some(4), stream.next().await);
     /// assert_eq!(Some(1), stream.next().await);
     /// assert_eq!(None, stream.next().await);
     /// # }
     /// ```
     </span><span class="kw">fn </span>skip_while&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; SkipWhile&lt;<span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; bool,
         <span class="self">Self</span>: Sized,
     {
         SkipWhile::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Tests if every element of the stream matches a predicate.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn all&lt;F&gt;(&amp;mut self, f: F) -&gt; bool;
     /// ```
     ///
     /// `all()` takes a closure that returns `true` or `false`. It applies
     /// this closure to each element of the stream, and if they all return
     /// `true`, then so does `all`. If any of them return `false`, it
     /// returns `false`. An empty stream returns `true`.
     ///
     /// `all()` is short-circuiting; in other words, it will stop processing
     /// as soon as it finds a `false`, given that no matter what else happens,
     /// the result will also be `false`.
     ///
     /// An empty stream returns `true`.
     ///
     /// # Examples
     ///
     /// Basic usage:
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let a = [1, 2, 3];
     ///
     /// assert!(stream::iter(&amp;a).all(|&amp;x| x &gt; 0).await);
     ///
     /// assert!(!stream::iter(&amp;a).all(|&amp;x| x &gt; 2).await);
     /// # }
     /// ```
     ///
     /// Stopping at the first `false`:
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let a = [1, 2, 3];
     ///
     /// let mut iter = stream::iter(&amp;a);
     ///
     /// assert!(!iter.all(|&amp;x| x != 2).await);
     ///
     /// // we can still use `iter`, as there are more elements.
     /// assert_eq!(iter.next().await, Some(&amp;3));
     /// # }
     /// ```
     </span><span class="kw">fn </span>all&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, f: F) -&gt; AllFuture&lt;<span class="lifetime">&#39;_</span>, <span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Unpin,
         F: FnMut(<span class="self">Self</span>::Item) -&gt; bool,
     {
         AllFuture::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Tests if any element of the stream matches a predicate.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn any&lt;F&gt;(&amp;mut self, f: F) -&gt; bool;
     /// ```
     ///
     /// `any()` takes a closure that returns `true` or `false`. It applies
     /// this closure to each element of the stream, and if any of them return
     /// `true`, then so does `any()`. If they all return `false`, it
     /// returns `false`.
     ///
     /// `any()` is short-circuiting; in other words, it will stop processing
     /// as soon as it finds a `true`, given that no matter what else happens,
     /// the result will also be `true`.
     ///
     /// An empty stream returns `false`.
     ///
     /// Basic usage:
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let a = [1, 2, 3];
     ///
     /// assert!(stream::iter(&amp;a).any(|&amp;x| x &gt; 0).await);
     ///
     /// assert!(!stream::iter(&amp;a).any(|&amp;x| x &gt; 5).await);
     /// # }
     /// ```
     ///
     /// Stopping at the first `true`:
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// let a = [1, 2, 3];
     ///
     /// let mut iter = stream::iter(&amp;a);
     ///
     /// assert!(iter.any(|&amp;x| x != 2).await);
     ///
     /// // we can still use `iter`, as there are more elements.
     /// assert_eq!(iter.next().await, Some(&amp;2));
     /// # }
     /// ```
     </span><span class="kw">fn </span>any&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, f: F) -&gt; AnyFuture&lt;<span class="lifetime">&#39;_</span>, <span class="self">Self</span>, F&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Unpin,
         F: FnMut(<span class="self">Self</span>::Item) -&gt; bool,
     {
         AnyFuture::new(<span class="self">self</span>, f)
     }

     <span class="doccomment">/// Combine two streams into one by first returning all values from the
     /// first stream then all values from the second stream.
     ///
     /// As long as `self` still has values to emit, no values from `other` are
     /// emitted, even if some are ready.
     ///
     /// # Examples
     ///
     /// ```
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let one = stream::iter(vec![1, 2, 3]);
     ///     let two = stream::iter(vec![4, 5, 6]);
     ///
     ///     let mut stream = one.chain(two);
     ///
     ///     assert_eq!(stream.next().await, Some(1));
     ///     assert_eq!(stream.next().await, Some(2));
     ///     assert_eq!(stream.next().await, Some(3));
     ///     assert_eq!(stream.next().await, Some(4));
     ///     assert_eq!(stream.next().await, Some(5));
     ///     assert_eq!(stream.next().await, Some(6));
     ///     assert_eq!(stream.next().await, None);
     /// }
     /// ```
     </span><span class="kw">fn </span>chain&lt;U&gt;(<span class="self">self</span>, other: U) -&gt; Chain&lt;<span class="self">Self</span>, U&gt;
     <span class="kw">where
         </span>U: Stream&lt;Item = <span class="self">Self</span>::Item&gt;,
         <span class="self">Self</span>: Sized,
     {
         Chain::new(<span class="self">self</span>, other)
     }

     <span class="doccomment">/// A combinator that applies a function to every element in a stream
     /// producing a single, final value.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn fold&lt;B, F&gt;(self, init: B, f: F) -&gt; B;
     /// ```
     ///
     /// # Examples
     /// Basic usage:
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, *};
     ///
     /// let s = stream::iter(vec![1u8, 2, 3]);
     /// let sum = s.fold(0, |acc, x| acc + x).await;
     ///
     /// assert_eq!(sum, 6);
     /// # }
     /// ```
     </span><span class="kw">fn </span>fold&lt;B, F&gt;(<span class="self">self</span>, init: B, f: F) -&gt; FoldFuture&lt;<span class="self">Self</span>, B, F&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
         F: FnMut(B, <span class="self">Self</span>::Item) -&gt; B,
     {
         FoldFuture::new(<span class="self">self</span>, init, f)
     }

     <span class="doccomment">/// Drain stream pushing all emitted values into a collection.
     ///
     /// Equivalent to:
     ///
     /// ```ignore
     /// async fn collect&lt;T&gt;(self) -&gt; T;
     /// ```
     ///
     /// `collect` streams all values, awaiting as needed. Values are pushed into
     /// a collection. A number of different target collection types are
     /// supported, including [`Vec`](std::vec::Vec),
     /// [`String`](std::string::String), and [`Bytes`].
     ///
     /// [`Bytes`]: https://docs.rs/bytes/0.6.0/bytes/struct.Bytes.html
     ///
     /// # `Result`
     ///
     /// `collect()` can also be used with streams of type `Result&lt;T, E&gt;` where
     /// `T: FromStream&lt;_&gt;`. In this case, `collect()` will stream as long as
     /// values yielded from the stream are `Ok(_)`. If `Err(_)` is encountered,
     /// streaming is terminated and `collect()` returns the `Err`.
     ///
     /// # Notes
     ///
     /// `FromStream` is currently a sealed trait. Stabilization is pending
     /// enhancements to the Rust language.
     ///
     /// # Examples
     ///
     /// Basic usage:
     ///
     /// ```
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     let doubled: Vec&lt;i32&gt; =
     ///         stream::iter(vec![1, 2, 3])
     ///             .map(|x| x * 2)
     ///             .collect()
     ///             .await;
     ///
     ///     assert_eq!(vec![2, 4, 6], doubled);
     /// }
     /// ```
     ///
     /// Collecting a stream of `Result` values
     ///
     /// ```
     /// use tokio_stream::{self as stream, StreamExt};
     ///
     /// #[tokio::main]
     /// async fn main() {
     ///     // A stream containing only `Ok` values will be collected
     ///     let values: Result&lt;Vec&lt;i32&gt;, &amp;str&gt; =
     ///         stream::iter(vec![Ok(1), Ok(2), Ok(3)])
     ///             .collect()
     ///             .await;
     ///
     ///     assert_eq!(Ok(vec![1, 2, 3]), values);
     ///
     ///     // A stream containing `Err` values will return the first error.
     ///     let results = vec![Ok(1), Err(&quot;no&quot;), Ok(2), Ok(3), Err(&quot;nein&quot;)];
     ///
     ///     let values: Result&lt;Vec&lt;i32&gt;, &amp;str&gt; =
     ///         stream::iter(results)
     ///             .collect()
     ///             .await;
     ///
     ///     assert_eq!(Err(&quot;no&quot;), values);
     /// }
     /// ```
     </span><span class="kw">fn </span>collect&lt;T&gt;(<span class="self">self</span>) -&gt; Collect&lt;<span class="self">Self</span>, T&gt;
     <span class="kw">where
         </span>T: FromStream&lt;<span class="self">Self</span>::Item&gt;,
         <span class="self">Self</span>: Sized,
     {
         Collect::new(<span class="self">self</span>)
     }

     <span class="doccomment">/// Applies a per-item timeout to the passed stream.
     ///
     /// `timeout()` takes a `Duration` that represents the maximum amount of
     /// time each element of the stream has to complete before timing out.
     ///
     /// If the wrapped stream yields a value before the deadline is reached, the
     /// value is returned. Otherwise, an error is returned. The caller may decide
     /// to continue consuming the stream and will eventually get the next source
     /// stream value once it becomes available. See
     /// [`timeout_repeating`](StreamExt::timeout_repeating) for an alternative
     /// where the timeouts will repeat.
     ///
     /// # Notes
     ///
     /// This function consumes the stream passed into it and returns a
     /// wrapped version of it.
     ///
     /// Polling the returned stream will continue to poll the inner stream even
     /// if one or more items time out.
     ///
     /// # Examples
     ///
     /// Suppose we have a stream `int_stream` that yields 3 numbers (1, 2, 3):
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     /// use std::time::Duration;
     /// # let int_stream = stream::iter(1..=3);
     ///
     /// let int_stream = int_stream.timeout(Duration::from_secs(1));
     /// tokio::pin!(int_stream);
     ///
     /// // When no items time out, we get the 3 elements in succession:
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(2)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(3)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     ///
     /// // If the second item times out, we get an error and continue polling the stream:
     /// # let mut int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]);
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert!(int_stream.try_next().await.is_err());
     /// assert_eq!(int_stream.try_next().await, Ok(Some(2)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(3)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     ///
     /// // If we want to stop consuming the source stream the first time an
     /// // element times out, we can use the `take_while` operator:
     /// # let int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]);
     /// let mut int_stream = int_stream.take_while(Result::is_ok);
     ///
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     /// # }
     /// ```
     ///
     /// Once a timeout error is received, no further events will be received
     /// unless the wrapped stream yields a value (timeouts do not repeat).
     ///
     /// ```
     /// # #[tokio::main(flavor = &quot;current_thread&quot;, start_paused = true)]
     /// # async fn main() {
     /// use tokio_stream::{StreamExt, wrappers::IntervalStream};
     /// use std::time::Duration;
     /// let interval_stream = IntervalStream::new(tokio::time::interval(Duration::from_millis(100)));
     /// let timeout_stream = interval_stream.timeout(Duration::from_millis(10));
     /// tokio::pin!(timeout_stream);
     ///
     /// // Only one timeout will be received between values in the source stream.
     /// assert!(timeout_stream.try_next().await.is_ok());
     /// assert!(timeout_stream.try_next().await.is_err(), &quot;expected one timeout&quot;);
     /// assert!(timeout_stream.try_next().await.is_ok(), &quot;expected no more timeouts&quot;);
     /// # }
     /// ```
     </span><span class="attribute">#[cfg(all(feature = <span class="string">&quot;time&quot;</span>))]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;time&quot;</span>)))]
     </span><span class="kw">fn </span>timeout(<span class="self">self</span>, duration: Duration) -&gt; Timeout&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         Timeout::new(<span class="self">self</span>, duration)
     }

     <span class="doccomment">/// Applies a per-item timeout to the passed stream.
     ///
     /// `timeout_repeating()` takes an [`Interval`](tokio::time::Interval) that
     /// controls the time each element of the stream has to complete before
     /// timing out.
     ///
     /// If the wrapped stream yields a value before the deadline is reached, the
     /// value is returned. Otherwise, an error is returned. The caller may decide
     /// to continue consuming the stream and will eventually get the next source
     /// stream value once it becomes available. Unlike `timeout()`, if no value
     /// becomes available before the deadline is reached, additional errors are
     /// returned at the specified interval. See [`timeout`](StreamExt::timeout)
     /// for an alternative where the timeouts do not repeat.
     ///
     /// # Notes
     ///
     /// This function consumes the stream passed into it and returns a
     /// wrapped version of it.
     ///
     /// Polling the returned stream will continue to poll the inner stream even
     /// if one or more items time out.
     ///
     /// # Examples
     ///
     /// Suppose we have a stream `int_stream` that yields 3 numbers (1, 2, 3):
     ///
     /// ```
     /// # #[tokio::main]
     /// # async fn main() {
     /// use tokio_stream::{self as stream, StreamExt};
     /// use std::time::Duration;
     /// # let int_stream = stream::iter(1..=3);
     ///
     /// let int_stream = int_stream.timeout_repeating(tokio::time::interval(Duration::from_secs(1)));
     /// tokio::pin!(int_stream);
     ///
     /// // When no items time out, we get the 3 elements in succession:
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(2)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(3)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     ///
     /// // If the second item times out, we get an error and continue polling the stream:
     /// # let mut int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]);
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert!(int_stream.try_next().await.is_err());
     /// assert_eq!(int_stream.try_next().await, Ok(Some(2)));
     /// assert_eq!(int_stream.try_next().await, Ok(Some(3)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     ///
     /// // If we want to stop consuming the source stream the first time an
     /// // element times out, we can use the `take_while` operator:
     /// # let int_stream = stream::iter(vec![Ok(1), Err(()), Ok(2), Ok(3)]);
     /// let mut int_stream = int_stream.take_while(Result::is_ok);
     ///
     /// assert_eq!(int_stream.try_next().await, Ok(Some(1)));
     /// assert_eq!(int_stream.try_next().await, Ok(None));
     /// # }
     /// ```
     ///
     /// Timeout errors will be continuously produced at the specified interval
     /// until the wrapped stream yields a value.
     ///
     /// ```
     /// # #[tokio::main(flavor = &quot;current_thread&quot;, start_paused = true)]
     /// # async fn main() {
     /// use tokio_stream::{StreamExt, wrappers::IntervalStream};
     /// use std::time::Duration;
     /// let interval_stream = IntervalStream::new(tokio::time::interval(Duration::from_millis(23)));
     /// let timeout_stream = interval_stream.timeout_repeating(tokio::time::interval(Duration::from_millis(9)));
     /// tokio::pin!(timeout_stream);
     ///
     /// // Multiple timeouts will be received between values in the source stream.
     /// assert!(timeout_stream.try_next().await.is_ok());
     /// assert!(timeout_stream.try_next().await.is_err(), &quot;expected one timeout&quot;);
     /// assert!(timeout_stream.try_next().await.is_err(), &quot;expected a second timeout&quot;);
     /// // Will eventually receive another value from the source stream...
     /// assert!(timeout_stream.try_next().await.is_ok(), &quot;expected non-timeout&quot;);
     /// # }
     /// ```
     </span><span class="attribute">#[cfg(all(feature = <span class="string">&quot;time&quot;</span>))]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;time&quot;</span>)))]
     </span><span class="kw">fn </span>timeout_repeating(<span class="self">self</span>, interval: Interval) -&gt; TimeoutRepeating&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         TimeoutRepeating::new(<span class="self">self</span>, interval)
     }

     <span class="doccomment">/// Slows down a stream by enforcing a delay between items.
     ///
     /// The underlying timer behind this utility has a granularity of one millisecond.
     ///
     /// # Example
     ///
     /// Create a throttled stream.
     /// ```rust,no_run
     /// use std::time::Duration;
     /// use tokio_stream::StreamExt;
     ///
     /// # async fn dox() {
     /// let item_stream = futures::stream::repeat(&quot;one&quot;).throttle(Duration::from_secs(2));
     /// tokio::pin!(item_stream);
     ///
     /// loop {
     ///     // The string will be produced at most every 2 seconds
     ///     println!(&quot;{:?}&quot;, item_stream.next().await);
     /// }
     /// # }
     /// ```
     </span><span class="attribute">#[cfg(all(feature = <span class="string">&quot;time&quot;</span>))]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;time&quot;</span>)))]
     </span><span class="kw">fn </span>throttle(<span class="self">self</span>, duration: Duration) -&gt; Throttle&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         throttle(duration, <span class="self">self</span>)
     }

     <span class="doccomment">/// Batches the items in the given stream using a maximum duration and size for each batch.
     ///
     /// This stream returns the next batch of items in the following situations:
     ///  1. The inner stream has returned at least `max_size` many items since the last batch.
     ///  2. The time since the first item of a batch is greater than the given duration.
     ///  3. The end of the stream is reached.
     ///
     /// The length of the returned vector is never empty or greater than the maximum size. Empty batches
     /// will not be emitted if no items are received upstream.
     ///
     /// # Panics
     ///
     /// This function panics if `max_size` is zero
     ///
     /// # Example
     ///
     /// ```rust
     /// use std::time::Duration;
     /// use tokio::time;
     /// use tokio_stream::{self as stream, StreamExt};
     /// use futures::FutureExt;
     ///
     /// #[tokio::main]
     /// # async fn _unused() {}
     /// # #[tokio::main(flavor = &quot;current_thread&quot;, start_paused = true)]
     /// async fn main() {
     ///     let iter = vec![1, 2, 3, 4].into_iter();
     ///     let stream0 = stream::iter(iter);
     ///
     ///     let iter = vec![5].into_iter();
     ///     let stream1 = stream::iter(iter)
     ///          .then(move |n| time::sleep(Duration::from_secs(5)).map(move |_| n));
     ///
     ///     let chunk_stream = stream0
     ///         .chain(stream1)
     ///         .chunks_timeout(3, Duration::from_secs(2));
     ///     tokio::pin!(chunk_stream);
     ///
     ///     // a full batch was received
     ///     assert_eq!(chunk_stream.next().await, Some(vec![1,2,3]));
     ///     // deadline was reached before max_size was reached
     ///     assert_eq!(chunk_stream.next().await, Some(vec![4]));
     ///     // last element in the stream
     ///     assert_eq!(chunk_stream.next().await, Some(vec![5]));
     /// }
     /// ```
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;time&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;time&quot;</span>)))]
     #[track_caller]
     </span><span class="kw">fn </span>chunks_timeout(<span class="self">self</span>, max_size: usize, duration: Duration) -&gt; ChunksTimeout&lt;<span class="self">Self</span>&gt;
     <span class="kw">where
         </span><span class="self">Self</span>: Sized,
     {
         <span class="macro">assert!</span>(max_size &gt; <span class="number">0</span>, <span class="string">&quot;`max_size` must be non-zero.&quot;</span>);
         ChunksTimeout::new(<span class="self">self</span>, max_size, duration)
     }
 }

 <span class="kw">impl</span>&lt;St: <span class="question-mark">?</span>Sized&gt; StreamExt <span class="kw">for </span>St <span class="kw">where </span>St: Stream {}

 <span class="doccomment">/// Merge the size hints from two streams.
 </span><span class="kw">fn </span>merge_size_hints(
     (left_low, left_high): (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;),
     (right_low, right_high): (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;),
 ) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
     <span class="kw">let </span>low = left_low.saturating_add(right_low);
     <span class="kw">let </span>high = <span class="kw">match </span>(left_high, right_high) {
         (<span class="prelude-val">Some</span>(h1), <span class="prelude-val">Some</span>(h2)) =&gt; h1.checked_add(h2),
         <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
     };
     (low, high)
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tokio_stream" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>