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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.28/src/stream/stream/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../futures_util/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../futures_util/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="doccomment">//! Streams
//!
//! This module contains a number of functions for working with `Stream`s,
//! including the `StreamExt` trait which adds methods to `Stream` types.
</span><span class="kw">use </span><span class="kw">crate</span>::future::{assert_future, Either};
<span class="kw">use </span><span class="kw">crate</span>::stream::assert_stream;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">use </span>alloc::boxed::Box;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">use </span>alloc::vec::Vec;
<span class="kw">use </span>core::pin::Pin;
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="kw">use </span>futures_core::stream::TryStream;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">use </span>futures_core::stream::{BoxStream, LocalBoxStream};
<span class="kw">use </span>futures_core::{
future::Future,
stream::{FusedStream, Stream},
task::{Context, Poll},
};
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="kw">use </span>futures_sink::Sink;
<span class="kw">use </span><span class="kw">crate</span>::fns::{inspect_fn, InspectFn};
<span class="kw">mod </span>chain;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::chain::Chain;
<span class="kw">mod </span>collect;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::collect::Collect;
<span class="kw">mod </span>unzip;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::unzip::Unzip;
<span class="kw">mod </span>concat;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::concat::Concat;
<span class="kw">mod </span>count;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::count::Count;
<span class="kw">mod </span>cycle;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::cycle::Cycle;
<span class="kw">mod </span>enumerate;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::enumerate::Enumerate;
<span class="kw">mod </span>filter;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::filter::Filter;
<span class="kw">mod </span>filter_map;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::filter_map::FilterMap;
<span class="kw">mod </span>flatten;
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Stream for the [`flatten`](StreamExt::flatten) method.
</span>Flatten&lt;St&gt;(
flatten::Flatten&lt;St, St::Item&gt;
): Debug + Sink + Stream + FusedStream + AccessInner[St, (.)] + New[|x: St| flatten::Flatten::new(x)]
<span class="kw">where </span>St: Stream
);
<span class="kw">mod </span>fold;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::fold::Fold;
<span class="kw">mod </span>any;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::any::Any;
<span class="kw">mod </span>all;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::all::All;
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="kw">mod </span>forward;
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`forward`](super::StreamExt::forward) method.
</span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
</span>Forward&lt;St, Si&gt;(
forward::Forward&lt;St, Si, St::Ok&gt;
): Debug + Future + FusedFuture + New[|x: St, y: Si| forward::Forward::new(x, y)]
<span class="kw">where </span>St: TryStream
);
<span class="kw">mod </span>for_each;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::for_each::ForEach;
<span class="kw">mod </span>fuse;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::fuse::Fuse;
<span class="kw">mod </span>into_future;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::into_future::StreamFuture;
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Stream for the [`inspect`](StreamExt::inspect) method.
</span>Inspect&lt;St, F&gt;(
map::Map&lt;St, InspectFn&lt;F&gt;&gt;
): Debug + Sink + Stream + FusedStream + AccessInner[St, (.)] + New[|x: St, f: F| map::Map::new(x, inspect_fn(f))]
);
<span class="kw">mod </span>map;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::map::Map;
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Stream for the [`flat_map`](StreamExt::flat_map) method.
</span>FlatMap&lt;St, U, F&gt;(
flatten::Flatten&lt;Map&lt;St, F&gt;, U&gt;
): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, f: F| flatten::Flatten::new(Map::new(x, f))]
);
<span class="kw">mod </span>next;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::next::Next;
<span class="kw">mod </span>select_next_some;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::select_next_some::SelectNextSome;
<span class="kw">mod </span>peek;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::peek::{NextIf, NextIfEq, Peek, PeekMut, Peekable};
<span class="kw">mod </span>skip;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::skip::Skip;
<span class="kw">mod </span>skip_while;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::skip_while::SkipWhile;
<span class="kw">mod </span>take;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::take::Take;
<span class="kw">mod </span>take_while;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::take_while::TakeWhile;
<span class="kw">mod </span>take_until;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::take_until::TakeUntil;
<span class="kw">mod </span>then;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::then::Then;
<span class="kw">mod </span>zip;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::zip::Zip;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>chunks;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::chunks::Chunks;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>ready_chunks;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::ready_chunks::ReadyChunks;
<span class="kw">mod </span>scan;
<span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::scan::Scan;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>buffer_unordered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::buffer_unordered::BufferUnordered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>buffered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::buffered::Buffered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>flatten_unordered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)]
</span><span class="kw">pub use </span><span class="self">self</span>::flatten_unordered::FlattenUnordered;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="macro">delegate_all!</span>(
<span class="doccomment">/// Stream for the [`flat_map_unordered`](StreamExt::flat_map_unordered) method.
</span>FlatMapUnordered&lt;St, U, F&gt;(
FlattenUnordered&lt;Map&lt;St, F&gt;&gt;
): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, limit: <span class="prelude-ty">Option</span>&lt;usize&gt;, f: F| FlattenUnordered::new(Map::new(x, f), limit)]
<span class="kw">where </span>St: Stream, U: Stream, U: Unpin, F: FnMut(St::Item) -&gt; U
);
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>for_each_concurrent;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::for_each_concurrent::ForEachConcurrent;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">mod </span>split;
<span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::split::{ReuniteError, SplitSink, SplitStream};
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">mod </span>catch_unwind;
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411
</span><span class="kw">pub use </span><span class="self">self</span>::catch_unwind::CatchUnwind;
<span class="kw">impl</span>&lt;T: <span class="question-mark">?</span>Sized&gt; StreamExt <span class="kw">for </span>T <span class="kw">where </span>T: Stream {}
<span class="doccomment">/// An extension trait for `Stream`s that provides a variety of convenient
/// combinator functions.
</span><span class="kw">pub trait </span>StreamExt: Stream {
<span class="doccomment">/// Creates a future that resolves to the next item in the stream.
///
/// 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.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, 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,
{
assert_future::&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;, <span class="kw">_</span>&gt;(Next::new(<span class="self">self</span>))
}
<span class="doccomment">/// Converts this stream into a future of `(next_item, tail_of_stream)`.
/// If the stream terminates, then the next item is [`None`].
///
/// The returned future can be used to compose streams and futures together
/// by placing everything into the &quot;world of futures&quot;.
///
/// Note that because `into_future` moves the stream, the [`Stream`] type
/// must be [`Unpin`]. If you want to use `into_future` 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.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=3);
///
/// let (item, stream) = stream.into_future().await;
/// assert_eq!(Some(1), item);
///
/// let (item, stream) = stream.into_future().await;
/// assert_eq!(Some(2), item);
/// # });
/// ```
</span><span class="kw">fn </span>into_future(<span class="self">self</span>) -&gt; StreamFuture&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + Unpin,
{
assert_future::&lt;(<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;, <span class="self">Self</span>), <span class="kw">_</span>&gt;(StreamFuture::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
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=3);
/// let stream = stream.map(|x| x + 3);
///
/// assert_eq!(vec![4, 5, 6], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</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,
{
assert_stream::&lt;T, <span class="kw">_</span>&gt;(Map::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Creates a stream which gives the current iteration count as well as
/// the next value.
///
/// The stream returned yields pairs `(i, val)`, where `i` is the
/// current index of iteration and `val` is the value returned by the
/// stream.
///
/// `enumerate()` keeps its count as a [`usize`]. If you want to count by a
/// different sized integer, the [`zip`](StreamExt::zip) function provides similar
/// functionality.
///
/// # Overflow Behavior
///
/// The method does no guarding against overflows, so enumerating more than
/// [`prim@usize::max_value()`] elements either produces the wrong result or panics. If
/// debug assertions are enabled, a panic is guaranteed.
///
/// # Panics
///
/// The returned stream might panic if the to-be-returned index would
/// overflow a [`usize`].
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(vec![&#39;a&#39;, &#39;b&#39;, &#39;c&#39;]);
///
/// let mut stream = stream.enumerate();
///
/// assert_eq!(stream.next().await, Some((0, &#39;a&#39;)));
/// assert_eq!(stream.next().await, Some((1, &#39;b&#39;)));
/// assert_eq!(stream.next().await, Some((2, &#39;c&#39;)));
/// assert_eq!(stream.next().await, None);
/// # });
/// ```
</span><span class="kw">fn </span>enumerate(<span class="self">self</span>) -&gt; Enumerate&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_stream::&lt;(usize, <span class="self">Self</span>::Item), <span class="kw">_</span>&gt;(Enumerate::new(<span class="self">self</span>))
}
<span class="doccomment">/// Filters the values produced by this stream according to the provided
/// asynchronous predicate.
///
/// As values of this stream are made available, the provided predicate `f`
/// will be run against them. If the predicate returns a `Future` which
/// resolves to `true`, then the stream will yield the value, but if the
/// predicate returns a `Future` which 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 the existing `filter` methods in the
/// standard library.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
/// let events = stream.filter(|x| future::ready(x % 2 == 0));
///
/// assert_eq!(vec![2, 4, 6, 8, 10], events.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>filter&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; Filter&lt;<span class="self">Self</span>, Fut, F&gt;
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; Fut,
Fut: Future&lt;Output = bool&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(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 asynchronous closure.
///
/// As values of this stream are made available, the provided function will
/// be run on them. If the future returned by the predicate `f` resolves to
/// [`Some(item)`](Some) then the stream will yield the value `item`, but if
/// it resolves to [`None`] then 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 the existing `filter_map` methods in
/// the standard library.
///
/// # Examples
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
/// let events = stream.filter_map(|x| async move {
/// if x % 2 == 0 { Some(x + 1) } else { None }
/// });
///
/// assert_eq!(vec![3, 5, 7, 9, 11], events.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>filter_map&lt;Fut, T, F&gt;(<span class="self">self</span>, f: F) -&gt; FilterMap&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&lt;Output = <span class="prelude-ty">Option</span>&lt;T&gt;&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;T, <span class="kw">_</span>&gt;(FilterMap::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Computes from this stream&#39;s items new items of a different type using
/// an asynchronous closure.
///
/// The provided closure `f` will be called with an `Item` once a value is
/// ready, it returns a future which will then be run to completion
/// to produce the next value on this stream.
///
/// Note that this function consumes the stream passed into it and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=3);
/// let stream = stream.then(|x| async move { x + 3 });
///
/// assert_eq!(vec![4, 5, 6], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>then&lt;Fut, F&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,
{
assert_stream::&lt;Fut::Output, <span class="kw">_</span>&gt;(Then::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Transforms a stream into a collection, returning a
/// future representing the result of that computation.
///
/// The returned future will be resolved when the stream terminates.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::mpsc;
/// use futures::stream::StreamExt;
/// use std::thread;
///
/// let (tx, rx) = mpsc::unbounded();
///
/// thread::spawn(move || {
/// for i in 1..=5 {
/// tx.unbounded_send(i).unwrap();
/// }
/// });
///
/// let output = rx.collect::&lt;Vec&lt;i32&gt;&gt;().await;
/// assert_eq!(output, vec![1, 2, 3, 4, 5]);
/// # });
/// ```
</span><span class="kw">fn </span>collect&lt;C: Default + Extend&lt;<span class="self">Self</span>::Item&gt;&gt;(<span class="self">self</span>) -&gt; Collect&lt;<span class="self">Self</span>, C&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_future::&lt;C, <span class="kw">_</span>&gt;(Collect::new(<span class="self">self</span>))
}
<span class="doccomment">/// Converts a stream of pairs into a future, which
/// resolves to pair of containers.
///
/// `unzip()` produces a future, which resolves to two
/// collections: one from the left elements of the pairs,
/// and one from the right elements.
///
/// The returned future will be resolved when the stream terminates.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::mpsc;
/// use futures::stream::StreamExt;
/// use std::thread;
///
/// let (tx, rx) = mpsc::unbounded();
///
/// thread::spawn(move || {
/// tx.unbounded_send((1, 2)).unwrap();
/// tx.unbounded_send((3, 4)).unwrap();
/// tx.unbounded_send((5, 6)).unwrap();
/// });
///
/// let (o1, o2): (Vec&lt;_&gt;, Vec&lt;_&gt;) = rx.unzip().await;
/// assert_eq!(o1, vec![1, 3, 5]);
/// assert_eq!(o2, vec![2, 4, 6]);
/// # });
/// ```
</span><span class="kw">fn </span>unzip&lt;A, B, FromA, FromB&gt;(<span class="self">self</span>) -&gt; Unzip&lt;<span class="self">Self</span>, FromA, FromB&gt;
<span class="kw">where
</span>FromA: Default + Extend&lt;A&gt;,
FromB: Default + Extend&lt;B&gt;,
<span class="self">Self</span>: Sized + Stream&lt;Item = (A, B)&gt;,
{
assert_future::&lt;(FromA, FromB), <span class="kw">_</span>&gt;(Unzip::new(<span class="self">self</span>))
}
<span class="doccomment">/// Concatenate all items of a stream into a single extendable
/// destination, returning a future representing the end result.
///
/// This combinator will extend the first item with the contents
/// of all the subsequent results of the stream. If the stream is
/// empty, the default value will be returned.
///
/// Works with all collections that implement the
/// [`Extend`](std::iter::Extend) trait.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::mpsc;
/// use futures::stream::StreamExt;
/// use std::thread;
///
/// let (tx, rx) = mpsc::unbounded();
///
/// thread::spawn(move || {
/// for i in (0..3).rev() {
/// let n = i * 3;
/// tx.unbounded_send(vec![n + 1, n + 2, n + 3]).unwrap();
/// }
/// });
///
/// let result = rx.concat().await;
///
/// assert_eq!(result, vec![7, 8, 9, 4, 5, 6, 1, 2, 3]);
/// # });
/// ```
</span><span class="kw">fn </span>concat(<span class="self">self</span>) -&gt; Concat&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
<span class="self">Self</span>::Item: Extend&lt;&lt;&lt;<span class="self">Self </span><span class="kw">as </span>Stream&gt;::Item <span class="kw">as </span>IntoIterator&gt;::Item&gt; + IntoIterator + Default,
{
assert_future::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Concat::new(<span class="self">self</span>))
}
<span class="doccomment">/// Drives the stream to completion, counting the number of items.
///
/// # Overflow Behavior
///
/// The method does no guarding against overflows, so counting elements of a
/// stream with more than [`usize::MAX`] elements either produces the wrong
/// result or panics. If debug assertions are enabled, a panic is guaranteed.
///
/// # Panics
///
/// This function might panic if the iterator has more than [`usize::MAX`]
/// elements.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
/// let count = stream.count().await;
///
/// assert_eq!(count, 10);
/// # });
/// ```
</span><span class="kw">fn </span>count(<span class="self">self</span>) -&gt; Count&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_future::&lt;usize, <span class="kw">_</span>&gt;(Count::new(<span class="self">self</span>))
}
<span class="doccomment">/// Repeats a stream endlessly.
///
/// The stream never terminates. Note that you likely want to avoid
/// usage of `collect` or such on the returned stream as it will exhaust
/// available memory as it tries to just fill up all RAM.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
/// let a = [1, 2, 3];
/// let mut s = stream::iter(a.iter()).cycle();
///
/// assert_eq!(s.next().await, Some(&amp;1));
/// assert_eq!(s.next().await, Some(&amp;2));
/// assert_eq!(s.next().await, Some(&amp;3));
/// assert_eq!(s.next().await, Some(&amp;1));
/// assert_eq!(s.next().await, Some(&amp;2));
/// assert_eq!(s.next().await, Some(&amp;3));
/// assert_eq!(s.next().await, Some(&amp;1));
/// # });
/// ```
</span><span class="kw">fn </span>cycle(<span class="self">self</span>) -&gt; Cycle&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + Clone,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Cycle::new(<span class="self">self</span>))
}
<span class="doccomment">/// Execute an accumulating asynchronous computation over a stream,
/// collecting all the values into one final result.
///
/// This combinator will accumulate all values returned by this stream
/// according to the closure provided. The initial state is also provided to
/// this method and then is returned again by each execution of the closure.
/// Once the entire stream has been exhausted the returned future will
/// resolve to this value.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let number_stream = stream::iter(0..6);
/// let sum = number_stream.fold(0, |acc, x| async move { acc + x });
/// assert_eq!(sum.await, 15);
/// # });
/// ```
</span><span class="kw">fn </span>fold&lt;T, Fut, F&gt;(<span class="self">self</span>, init: T, f: F) -&gt; Fold&lt;<span class="self">Self</span>, Fut, T, F&gt;
<span class="kw">where
</span>F: FnMut(T, <span class="self">Self</span>::Item) -&gt; Fut,
Fut: Future&lt;Output = T&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;T, <span class="kw">_</span>&gt;(Fold::new(<span class="self">self</span>, f, init))
}
<span class="doccomment">/// Execute predicate over asynchronous stream, and return `true` if any element in stream satisfied a predicate.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let number_stream = stream::iter(0..10);
/// let contain_three = number_stream.any(|i| async move { i == 3 });
/// assert_eq!(contain_three.await, true);
/// # });
/// ```
</span><span class="kw">fn </span>any&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; Any&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&lt;Output = bool&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;bool, <span class="kw">_</span>&gt;(Any::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Execute predicate over asynchronous stream, and return `true` if all element in stream satisfied a predicate.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let number_stream = stream::iter(0..10);
/// let less_then_twenty = number_stream.all(|i| async move { i &lt; 20 });
/// assert_eq!(less_then_twenty.await, true);
/// # });
/// ```
</span><span class="kw">fn </span>all&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; All&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&lt;Output = bool&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;bool, <span class="kw">_</span>&gt;(All::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Flattens a stream of streams into just one continuous stream.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::mpsc;
/// use futures::stream::StreamExt;
/// use std::thread;
///
/// let (tx1, rx1) = mpsc::unbounded();
/// let (tx2, rx2) = mpsc::unbounded();
/// let (tx3, rx3) = mpsc::unbounded();
///
/// thread::spawn(move || {
/// tx1.unbounded_send(1).unwrap();
/// tx1.unbounded_send(2).unwrap();
/// });
/// thread::spawn(move || {
/// tx2.unbounded_send(3).unwrap();
/// tx2.unbounded_send(4).unwrap();
/// });
/// thread::spawn(move || {
/// tx3.unbounded_send(rx1).unwrap();
/// tx3.unbounded_send(rx2).unwrap();
/// });
///
/// let output = rx3.flatten().collect::&lt;Vec&lt;i32&gt;&gt;().await;
/// assert_eq!(output, vec![1, 2, 3, 4]);
/// # });
/// ```
</span><span class="kw">fn </span>flatten(<span class="self">self</span>) -&gt; Flatten&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>::Item: Stream,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;&lt;<span class="self">Self</span>::Item <span class="kw">as </span>Stream&gt;::Item, <span class="kw">_</span>&gt;(Flatten::new(<span class="self">self</span>))
}
<span class="doccomment">/// Flattens a stream of streams into just one continuous stream. Polls
/// inner streams produced by the base stream concurrently.
///
/// The only argument is an optional limit on the number of concurrently
/// polled streams. If this limit is not `None`, no more than `limit` streams
/// will be polled at the same time. The `limit` argument is of type
/// `Into&lt;Option&lt;usize&gt;&gt;`, and so can be provided as either `None`,
/// `Some(10)`, or just `10`. Note: a limit of zero is interpreted as
/// no limit at all, and will have the same result as passing in `None`.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::mpsc;
/// use futures::stream::StreamExt;
/// use std::thread;
///
/// let (tx1, rx1) = mpsc::unbounded();
/// let (tx2, rx2) = mpsc::unbounded();
/// let (tx3, rx3) = mpsc::unbounded();
///
/// thread::spawn(move || {
/// tx1.unbounded_send(1).unwrap();
/// tx1.unbounded_send(2).unwrap();
/// });
/// thread::spawn(move || {
/// tx2.unbounded_send(3).unwrap();
/// tx2.unbounded_send(4).unwrap();
/// });
/// thread::spawn(move || {
/// tx3.unbounded_send(rx1).unwrap();
/// tx3.unbounded_send(rx2).unwrap();
/// });
///
/// let mut output = rx3.flatten_unordered(None).collect::&lt;Vec&lt;i32&gt;&gt;().await;
/// output.sort();
///
/// assert_eq!(output, vec![1, 2, 3, 4]);
/// # });
/// ```
</span><span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>flatten_unordered(<span class="self">self</span>, limit: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;usize&gt;&gt;) -&gt; FlattenUnordered&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>::Item: Stream + Unpin,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;&lt;<span class="self">Self</span>::Item <span class="kw">as </span>Stream&gt;::Item, <span class="kw">_</span>&gt;(FlattenUnordered::new(<span class="self">self</span>, limit.into()))
}
<span class="doccomment">/// Maps a stream like [`StreamExt::map`] but flattens nested `Stream`s.
///
/// [`StreamExt::map`] is very useful, but if it produces a `Stream` instead,
/// you would have to chain combinators like `.map(f).flatten()` while this
/// combinator provides ability to write `.flat_map(f)` instead of chaining.
///
/// The provided closure which produces inner streams is executed over all elements
/// of stream as last inner stream is terminated and next stream item is available.
///
/// Note that this function consumes the stream passed into it and returns a
/// wrapped version of it, similar to the existing `flat_map` methods in the
/// standard library.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=3);
/// let stream = stream.flat_map(|x| stream::iter(vec![x + 3; x]));
///
/// assert_eq!(vec![4, 5, 5, 6, 6, 6], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>flat_map&lt;U, F&gt;(<span class="self">self</span>, f: F) -&gt; FlatMap&lt;<span class="self">Self</span>, U, F&gt;
<span class="kw">where
</span>F: FnMut(<span class="self">Self</span>::Item) -&gt; U,
U: Stream,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;U::Item, <span class="kw">_</span>&gt;(FlatMap::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Maps a stream like [`StreamExt::map`] but flattens nested `Stream`s
/// and polls them concurrently, yielding items in any order, as they made
/// available.
///
/// [`StreamExt::map`] is very useful, but if it produces `Stream`s
/// instead, and you need to poll all of them concurrently, you would
/// have to use something like `for_each_concurrent` and merge values
/// by hand. This combinator provides ability to collect all values
/// from concurrently polled streams into one stream.
///
/// The first argument is an optional limit on the number of concurrently
/// polled streams. If this limit is not `None`, no more than `limit` streams
/// will be polled at the same time. The `limit` argument is of type
/// `Into&lt;Option&lt;usize&gt;&gt;`, and so can be provided as either `None`,
/// `Some(10)`, or just `10`. Note: a limit of zero is interpreted as
/// no limit at all, and will have the same result as passing in `None`.
///
/// The provided closure which produces inner streams is executed over
/// all elements of stream as next stream item is available and limit
/// of concurrently processed streams isn&#39;t exceeded.
///
/// Note that this function consumes the stream passed into it and
/// returns a wrapped version of it.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..5);
/// let stream = stream.flat_map_unordered(1, |x| stream::iter(vec![x; x]));
/// let mut values = stream.collect::&lt;Vec&lt;_&gt;&gt;().await;
/// values.sort();
///
/// assert_eq!(vec![1usize, 2, 2, 3, 3, 3, 4, 4, 4, 4], values);
/// # });
/// ```
</span><span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>flat_map_unordered&lt;U, F&gt;(
<span class="self">self</span>,
limit: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;usize&gt;&gt;,
f: F,
) -&gt; FlatMapUnordered&lt;<span class="self">Self</span>, U, F&gt;
<span class="kw">where
</span>U: Stream + Unpin,
F: FnMut(<span class="self">Self</span>::Item) -&gt; U,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;U::Item, <span class="kw">_</span>&gt;(FlatMapUnordered::new(<span class="self">self</span>, limit.into(), f))
}
<span class="doccomment">/// Combinator similar to [`StreamExt::fold`] that holds internal state
/// and produces a new stream.
///
/// Accepts initial state and closure which will be applied to each element
/// of the stream until provided closure returns `None`. Once `None` is
/// returned, stream will be terminated.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
///
/// let stream = stream.scan(0, |state, x| {
/// *state += x;
/// future::ready(if *state &lt; 10 { Some(x) } else { None })
/// });
///
/// assert_eq!(vec![1, 2, 3], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>scan&lt;S, B, Fut, F&gt;(<span class="self">self</span>, initial_state: S, f: F) -&gt; Scan&lt;<span class="self">Self</span>, S, Fut, F&gt;
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;mut </span>S, <span class="self">Self</span>::Item) -&gt; Fut,
Fut: Future&lt;Output = <span class="prelude-ty">Option</span>&lt;B&gt;&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;B, <span class="kw">_</span>&gt;(Scan::new(<span class="self">self</span>, initial_state, f))
}
<span class="doccomment">/// Skip elements on this stream while the provided asynchronous predicate
/// resolves to `true`.
///
/// This function, like `Iterator::skip_while`, will skip elements on the
/// stream until the predicate `f` resolves to `false`. Once one element
/// returns `false`, all future elements will be returned from the underlying
/// stream.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
///
/// let stream = stream.skip_while(|x| future::ready(*x &lt;= 5));
///
/// assert_eq!(vec![6, 7, 8, 9, 10], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>skip_while&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; SkipWhile&lt;<span class="self">Self</span>, Fut, F&gt;
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; Fut,
Fut: Future&lt;Output = bool&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(SkipWhile::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Take elements from this stream while the provided asynchronous 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
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10);
///
/// let stream = stream.take_while(|x| future::ready(*x &lt;= 5));
///
/// assert_eq!(vec![1, 2, 3, 4, 5], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>take_while&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; TakeWhile&lt;<span class="self">Self</span>, Fut, F&gt;
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;</span><span class="self">Self</span>::Item) -&gt; Fut,
Fut: Future&lt;Output = bool&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(TakeWhile::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Take elements from this stream until the provided future resolves.
///
/// This function will take elements from the stream until the provided
/// stopping future `fut` resolves. Once the `fut` future becomes ready,
/// this stream combinator will always return that the stream is done.
///
/// The stopping future may return any type. Once the stream is stopped
/// the result of the stopping future may be accessed with `TakeUntil::take_result()`.
/// The stream may also be resumed with `TakeUntil::take_future()`.
/// See the documentation of [`TakeUntil`] for more information.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
/// use futures::task::Poll;
///
/// let stream = stream::iter(1..=10);
///
/// let mut i = 0;
/// let stop_fut = future::poll_fn(|_cx| {
/// i += 1;
/// if i &lt;= 5 {
/// Poll::Pending
/// } else {
/// Poll::Ready(())
/// }
/// });
///
/// let stream = stream.take_until(stop_fut);
///
/// assert_eq!(vec![1, 2, 3, 4, 5], stream.collect::&lt;Vec&lt;_&gt;&gt;().await);
/// # });
/// ```
</span><span class="kw">fn </span>take_until&lt;Fut&gt;(<span class="self">self</span>, fut: Fut) -&gt; TakeUntil&lt;<span class="self">Self</span>, Fut&gt;
<span class="kw">where
</span>Fut: Future,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(TakeUntil::new(<span class="self">self</span>, fut))
}
<span class="doccomment">/// Runs this stream to completion, executing the provided asynchronous
/// closure for each element on the stream.
///
/// The closure provided will be called for each item this stream produces,
/// yielding a future. That future will then be executed to completion
/// before moving on to the next item.
///
/// The returned value is a `Future` where the `Output` type is `()`; it is
/// executed entirely for its side effects.
///
/// To process each item in the stream and produce another stream instead
/// of a single future, use `then` instead.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future;
/// use futures::stream::{self, StreamExt};
///
/// let mut x = 0;
///
/// {
/// let fut = stream::repeat(1).take(3).for_each(|item| {
/// x += item;
/// future::ready(())
/// });
/// fut.await;
/// }
///
/// assert_eq!(x, 3);
/// # });
/// ```
</span><span class="kw">fn </span>for_each&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; ForEach&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&lt;Output = ()&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;(), <span class="kw">_</span>&gt;(ForEach::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Runs this stream to completion, executing the provided asynchronous
/// closure for each element on the stream concurrently as elements become
/// available.
///
/// This is similar to [`StreamExt::for_each`], but the futures
/// produced by the closure are run concurrently (but not in parallel--
/// this combinator does not introduce any threads).
///
/// The closure provided will be called for each item this stream produces,
/// yielding a future. That future will then be executed to completion
/// concurrently with the other futures produced by the closure.
///
/// The first argument is an optional limit on the number of concurrent
/// futures. If this limit is not `None`, no more than `limit` futures
/// will be run concurrently. The `limit` argument is of type
/// `Into&lt;Option&lt;usize&gt;&gt;`, and so can be provided as either `None`,
/// `Some(10)`, or just `10`. Note: a limit of zero is interpreted as
/// no limit at all, and will have the same result as passing in `None`.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::oneshot;
/// use futures::stream::{self, StreamExt};
///
/// let (tx1, rx1) = oneshot::channel();
/// let (tx2, rx2) = oneshot::channel();
/// let (tx3, rx3) = oneshot::channel();
///
/// let fut = stream::iter(vec![rx1, rx2, rx3]).for_each_concurrent(
/// /* limit */ 2,
/// |rx| async move {
/// rx.await.unwrap();
/// }
/// );
/// tx1.send(()).unwrap();
/// tx2.send(()).unwrap();
/// tx3.send(()).unwrap();
/// fut.await;
/// # })
/// ```
</span><span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>for_each_concurrent&lt;Fut, F&gt;(
<span class="self">self</span>,
limit: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;usize&gt;&gt;,
f: F,
) -&gt; ForEachConcurrent&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&lt;Output = ()&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;(), <span class="kw">_</span>&gt;(ForEachConcurrent::new(<span class="self">self</span>, limit.into(), f))
}
<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
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10).take(3);
///
/// assert_eq!(vec![1, 2, 3], stream.collect::&lt;Vec&lt;_&gt;&gt;().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,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Take::new(<span class="self">self</span>, n))
}
<span class="doccomment">/// Creates a new stream which skips `n` items of the underlying stream.
///
/// Once `n` items have been skipped from this stream then it will always
/// return the remaining items on this stream.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(1..=10).skip(5);
///
/// assert_eq!(vec![6, 7, 8, 9, 10], stream.collect::&lt;Vec&lt;_&gt;&gt;().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,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Skip::new(<span class="self">self</span>, n))
}
<span class="doccomment">/// Fuse a stream such that [`poll_next`](Stream::poll_next) will never
/// again be called once it has finished. This method can be used to turn
/// any `Stream` into a `FusedStream`.
///
/// Normally, once a stream has returned [`None`] from
/// [`poll_next`](Stream::poll_next) any further calls could exhibit bad
/// behavior such as block forever, panic, never return, etc. If it is known
/// that [`poll_next`](Stream::poll_next) may be called after stream
/// has already finished, then this method can be used to ensure that it has
/// defined semantics.
///
/// The [`poll_next`](Stream::poll_next) method of a `fuse`d stream
/// is guaranteed to return [`None`] after the underlying stream has
/// finished.
///
/// # Examples
///
/// ```
/// use futures::executor::block_on_stream;
/// use futures::stream::{self, StreamExt};
/// use futures::task::Poll;
///
/// let mut x = 0;
/// let stream = stream::poll_fn(|_| {
/// x += 1;
/// match x {
/// 0..=2 =&gt; Poll::Ready(Some(x)),
/// 3 =&gt; Poll::Ready(None),
/// _ =&gt; panic!(&quot;should not happen&quot;)
/// }
/// }).fuse();
///
/// let mut iter = block_on_stream(stream);
/// assert_eq!(Some(1), iter.next());
/// assert_eq!(Some(2), iter.next());
/// assert_eq!(None, iter.next());
/// assert_eq!(None, iter.next());
/// // ...
/// ```
</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,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Fuse::new(<span class="self">self</span>))
}
<span class="doccomment">/// Borrows a stream, rather than consuming it.
///
/// This is useful to allow applying stream adaptors while still retaining
/// ownership of the original stream.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let mut stream = stream::iter(1..5);
///
/// let sum = stream.by_ref()
/// .take(2)
/// .fold(0, |a, b| async move { a + b })
/// .await;
/// assert_eq!(sum, 3);
///
/// // You can use the stream again
/// let sum = stream.take(2)
/// .fold(0, |a, b| async move { a + b })
/// .await;
/// assert_eq!(sum, 7);
/// # });
/// ```
</span><span class="kw">fn </span>by_ref(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
<span class="self">self
</span>}
<span class="doccomment">/// Catches unwinding panics while polling the stream.
///
/// Caught panic (if any) will be the last element of the resulting stream.
///
/// In general, panics within a stream can propagate all the way out to the
/// task level. This combinator makes it possible to halt unwinding within
/// the stream itself. It&#39;s most commonly used within task executors. This
/// method should not be used for error handling.
///
/// Note that this method requires the `UnwindSafe` bound from the standard
/// library. This isn&#39;t always applied automatically, and the standard
/// library provides an `AssertUnwindSafe` wrapper type to apply it
/// after-the fact. To assist using this method, the [`Stream`] trait is
/// also implemented for `AssertUnwindSafe&lt;St&gt;` where `St` implements
/// [`Stream`].
///
/// This method is only available when the `std` feature of this
/// library is activated, and it is activated by default.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream = stream::iter(vec![Some(10), None, Some(11)]);
/// // Panic on second element
/// let stream_panicking = stream.map(|o| o.unwrap());
/// // Collect all the results
/// let stream = stream_panicking.catch_unwind();
///
/// let results: Vec&lt;Result&lt;i32, _&gt;&gt; = stream.collect().await;
/// match results[0] {
/// Ok(10) =&gt; {}
/// _ =&gt; panic!(&quot;unexpected result!&quot;),
/// }
/// assert!(results[1].is_err());
/// assert_eq!(results.len(), 2);
/// # });
/// ```
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">fn </span>catch_unwind(<span class="self">self</span>) -&gt; CatchUnwind&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + std::panic::UnwindSafe,
{
assert_stream(CatchUnwind::new(<span class="self">self</span>))
}
<span class="doccomment">/// Wrap the stream in a Box, pinning it.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>boxed&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="self">self</span>) -&gt; BoxStream&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>::Item&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + Send + <span class="lifetime">&#39;a</span>,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Box::pin(<span class="self">self</span>))
}
<span class="doccomment">/// Wrap the stream in a Box, pinning it.
///
/// Similar to `boxed`, but without the `Send` requirement.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>boxed_local&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="self">self</span>) -&gt; LocalBoxStream&lt;<span class="lifetime">&#39;a</span>, <span class="self">Self</span>::Item&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + <span class="lifetime">&#39;a</span>,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Box::pin(<span class="self">self</span>))
}
<span class="doccomment">/// An adaptor for creating a buffered list of pending futures.
///
/// If this stream&#39;s item can be converted into a future, then this adaptor
/// will buffer up to at most `n` futures and then return the outputs in the
/// same order as the underlying stream. No more than `n` futures will be
/// buffered at any point in time, and less than `n` may also be buffered
/// depending on the state of each future.
///
/// The returned stream will be a stream of each future&#39;s output.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
</span><span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>buffered(<span class="self">self</span>, n: usize) -&gt; Buffered&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>::Item: Future,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;&lt;<span class="self">Self</span>::Item <span class="kw">as </span>Future&gt;::Output, <span class="kw">_</span>&gt;(Buffered::new(<span class="self">self</span>, n))
}
<span class="doccomment">/// An adaptor for creating a buffered list of pending futures (unordered).
///
/// If this stream&#39;s item can be converted into a future, then this adaptor
/// will buffer up to `n` futures and then return the outputs in the order
/// in which they complete. No more than `n` futures will be buffered at
/// any point in time, and less than `n` may also be buffered depending on
/// the state of each future.
///
/// The returned stream will be a stream of each future&#39;s output.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::channel::oneshot;
/// use futures::stream::{self, StreamExt};
///
/// let (send_one, recv_one) = oneshot::channel();
/// let (send_two, recv_two) = oneshot::channel();
///
/// let stream_of_futures = stream::iter(vec![recv_one, recv_two]);
/// let mut buffered = stream_of_futures.buffer_unordered(10);
///
/// send_two.send(2i32)?;
/// assert_eq!(buffered.next().await, Some(Ok(2i32)));
///
/// send_one.send(1i32)?;
/// assert_eq!(buffered.next().await, Some(Ok(1i32)));
///
/// assert_eq!(buffered.next().await, None);
/// # Ok::&lt;(), i32&gt;(()) }).unwrap();
/// ```
</span><span class="attribute">#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>buffer_unordered(<span class="self">self</span>, n: usize) -&gt; BufferUnordered&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>::Item: Future,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;&lt;<span class="self">Self</span>::Item <span class="kw">as </span>Future&gt;::Output, <span class="kw">_</span>&gt;(BufferUnordered::new(<span class="self">self</span>, n))
}
<span class="doccomment">/// An adapter for zipping two streams together.
///
/// The zipped stream waits for both streams to produce an item, and then
/// returns that pair. If either stream ends then the zipped stream will
/// also end.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream1 = stream::iter(1..=3);
/// let stream2 = stream::iter(5..=10);
///
/// let vec = stream1.zip(stream2)
/// .collect::&lt;Vec&lt;_&gt;&gt;()
/// .await;
/// assert_eq!(vec![(1, 5), (2, 6), (3, 7)], vec);
/// # });
/// ```
///
</span><span class="kw">fn </span>zip&lt;St&gt;(<span class="self">self</span>, other: St) -&gt; Zip&lt;<span class="self">Self</span>, St&gt;
<span class="kw">where
</span>St: Stream,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;(<span class="self">Self</span>::Item, St::Item), <span class="kw">_</span>&gt;(Zip::new(<span class="self">self</span>, other))
}
<span class="doccomment">/// Adapter for chaining two streams.
///
/// The resulting stream emits elements from the first stream, and when
/// first stream reaches the end, emits the elements from the second stream.
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::stream::{self, StreamExt};
///
/// let stream1 = stream::iter(vec![Ok(10), Err(false)]);
/// let stream2 = stream::iter(vec![Err(true), Ok(20)]);
///
/// let stream = stream1.chain(stream2);
///
/// let result: Vec&lt;_&gt; = stream.collect().await;
/// assert_eq!(result, vec![
/// Ok(10),
/// Err(false),
/// Err(true),
/// Ok(20),
/// ]);
/// # });
/// ```
</span><span class="kw">fn </span>chain&lt;St&gt;(<span class="self">self</span>, other: St) -&gt; Chain&lt;<span class="self">Self</span>, St&gt;
<span class="kw">where
</span>St: Stream&lt;Item = <span class="self">Self</span>::Item&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Chain::new(<span class="self">self</span>, other))
}
<span class="doccomment">/// Creates a new stream which exposes a `peek` method.
///
/// Calling `peek` returns a reference to the next item in the stream.
</span><span class="kw">fn </span>peekable(<span class="self">self</span>) -&gt; Peekable&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Peekable::new(<span class="self">self</span>))
}
<span class="doccomment">/// An adaptor for chunking up items of the stream inside a vector.
///
/// This combinator will attempt to pull items from this stream and buffer
/// them into a local vector. At most `capacity` items will get buffered
/// before they&#39;re yielded from the returned stream.
///
/// Note that the vectors returned from this iterator may not always have
/// `capacity` elements. If the underlying stream ended and only a partial
/// vector was created, it&#39;ll be returned. Additionally if an error happens
/// from the underlying stream then the currently buffered items will be
/// yielded.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
///
/// # Panics
///
/// This method will panic if `capacity` is zero.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>chunks(<span class="self">self</span>, capacity: usize) -&gt; Chunks&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_stream::&lt;Vec&lt;<span class="self">Self</span>::Item&gt;, <span class="kw">_</span>&gt;(Chunks::new(<span class="self">self</span>, capacity))
}
<span class="doccomment">/// An adaptor for chunking up ready items of the stream inside a vector.
///
/// This combinator will attempt to pull ready items from this stream and
/// buffer them into a local vector. At most `capacity` items will get
/// buffered before they&#39;re yielded from the returned stream. If underlying
/// stream returns `Poll::Pending`, and collected chunk is not empty, it will
/// be immediately returned.
///
/// If the underlying stream ended and only a partial vector was created,
/// it will be returned.
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
///
/// # Panics
///
/// This method will panic if `capacity` is zero.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>ready_chunks(<span class="self">self</span>, capacity: usize) -&gt; ReadyChunks&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_stream::&lt;Vec&lt;<span class="self">Self</span>::Item&gt;, <span class="kw">_</span>&gt;(ReadyChunks::new(<span class="self">self</span>, capacity))
}
<span class="doccomment">/// A future that completes after the given stream has been fully processed
/// into the sink and the sink has been flushed and closed.
///
/// This future will drive the stream to keep producing items until it is
/// exhausted, sending each item to the sink. It will complete once the
/// stream is exhausted, the sink has received and flushed all items, and
/// the sink is closed. Note that neither the original stream nor provided
/// sink will be output by this future. Pass the sink by `Pin&lt;&amp;mut S&gt;`
/// (for example, via `forward(&amp;mut sink)` inside an `async` fn/block) in
/// order to preserve access to the `Sink`. If the stream produces an error,
/// that error will be returned by this future without flushing/closing the sink.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
</span><span class="kw">fn </span>forward&lt;S&gt;(<span class="self">self</span>, sink: S) -&gt; Forward&lt;<span class="self">Self</span>, S&gt;
<span class="kw">where
</span>S: Sink&lt;<span class="self">Self</span>::Ok, Error = <span class="self">Self</span>::Error&gt;,
<span class="self">Self</span>: TryStream + Sized,
<span class="comment">// Self: TryStream + Sized + Stream&lt;Item = Result&lt;&lt;Self as TryStream&gt;::Ok, &lt;Self as TryStream&gt;::Error&gt;&gt;,
</span>{
<span class="comment">// TODO: type mismatch resolving `&lt;Self as futures_core::Stream&gt;::Item == std::result::Result&lt;&lt;Self as futures_core::TryStream&gt;::Ok, &lt;Self as futures_core::TryStream&gt;::Error&gt;`
// assert_future::&lt;Result&lt;(), Self::Error&gt;, _&gt;(Forward::new(self, sink))
</span>Forward::new(<span class="self">self</span>, sink)
}
<span class="doccomment">/// Splits this `Stream + Sink` object into separate `Sink` and `Stream`
/// objects.
///
/// This can be useful when you want to split ownership between tasks, or
/// allow direct interaction between the two objects (e.g. via
/// `Sink::send_all`).
///
/// This method is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
#[cfg(not(futures_no_atomic_cas))]
#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">fn </span>split&lt;Item&gt;(<span class="self">self</span>) -&gt; (SplitSink&lt;<span class="self">Self</span>, Item&gt;, SplitStream&lt;<span class="self">Self</span>&gt;)
<span class="kw">where
</span><span class="self">Self</span>: Sink&lt;Item&gt; + Sized,
{
<span class="kw">let </span>(sink, stream) = split::split(<span class="self">self</span>);
(
<span class="kw">crate</span>::sink::assert_sink::&lt;Item, <span class="self">Self</span>::Error, <span class="kw">_</span>&gt;(sink),
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(stream),
)
}
<span class="doccomment">/// Do something with each item of this stream, afterwards passing it on.
///
/// This is similar to the `Iterator::inspect` method in the standard
/// library where it allows easily inspecting each value as it passes
/// through the stream, for example to debug what&#39;s going on.
</span><span class="kw">fn </span>inspect&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; Inspect&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),
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Inspect::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Wrap this stream in an `Either` stream, making it the left-hand variant
/// of that `Either`.
///
/// This can be used in combination with the `right_stream` method to write `if`
/// statements that evaluate to different streams in different branches.
</span><span class="kw">fn </span>left_stream&lt;B&gt;(<span class="self">self</span>) -&gt; Either&lt;<span class="self">Self</span>, B&gt;
<span class="kw">where
</span>B: Stream&lt;Item = <span class="self">Self</span>::Item&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Either::Left(<span class="self">self</span>))
}
<span class="doccomment">/// Wrap this stream in an `Either` stream, making it the right-hand variant
/// of that `Either`.
///
/// This can be used in combination with the `left_stream` method to write `if`
/// statements that evaluate to different streams in different branches.
</span><span class="kw">fn </span>right_stream&lt;B&gt;(<span class="self">self</span>) -&gt; Either&lt;B, <span class="self">Self</span>&gt;
<span class="kw">where
</span>B: Stream&lt;Item = <span class="self">Self</span>::Item&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(Either::Right(<span class="self">self</span>))
}
<span class="doccomment">/// A convenience method for calling [`Stream::poll_next`] on [`Unpin`]
/// stream types.
</span><span class="kw">fn </span>poll_next_unpin(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
Pin::new(<span class="self">self</span>).poll_next(cx)
}
<span class="doccomment">/// Returns a [`Future`] that resolves when the next item in this stream is
/// ready.
///
/// This is similar to the [`next`][StreamExt::next] method, but it won&#39;t
/// resolve to [`None`] if used on an empty [`Stream`]. Instead, the
/// returned future type will return `true` from
/// [`FusedFuture::is_terminated`][] when the [`Stream`] is empty, allowing
/// [`select_next_some`][StreamExt::select_next_some] to be easily used with
/// the [`select!`] macro.
///
/// If the future is polled after this [`Stream`] is empty it will panic.
/// Using the future with a [`FusedFuture`][]-aware primitive like the
/// [`select!`] macro will prevent this.
///
/// [`FusedFuture`]: futures_core::future::FusedFuture
/// [`FusedFuture::is_terminated`]: futures_core::future::FusedFuture::is_terminated
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::{future, select};
/// use futures::stream::{StreamExt, FuturesUnordered};
///
/// let mut fut = future::ready(1);
/// let mut async_tasks = FuturesUnordered::new();
/// let mut total = 0;
/// loop {
/// select! {
/// num = fut =&gt; {
/// // First, the `ready` future completes.
/// total += num;
/// // Then we spawn a new task onto `async_tasks`,
/// async_tasks.push(async { 5 });
/// },
/// // On the next iteration of the loop, the task we spawned
/// // completes.
/// num = async_tasks.select_next_some() =&gt; {
/// total += num;
/// }
/// // Finally, both the `ready` future and `async_tasks` have
/// // finished, so we enter the `complete` branch.
/// complete =&gt; break,
/// }
/// }
/// assert_eq!(total, 6);
/// # });
/// ```
///
/// [`select!`]: crate::select
</span><span class="kw">fn </span>select_next_some(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; SelectNextSome&lt;<span class="lifetime">&#39;_</span>, <span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin + FusedStream,
{
assert_future::&lt;<span class="self">Self</span>::Item, <span class="kw">_</span>&gt;(SelectNextSome::new(<span class="self">self</span>))
}
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>