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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Module <a href='../../index.html'>tokio</a>::<wbr><a href='../index.html'>prelude</a>::<wbr><a class="mod" href=''>stream</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>&#x2212;</span>]
</a>
</span><a class='srclink' href='../../../src/futures/lib.rs.html#180' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>Asynchronous streams</p>
<p>This module contains the <code>Stream</code> trait and a number of adaptors for this
trait. This trait is very similar to the <code>Iterator</code> trait in the standard
library except that it expresses the concept of blocking as well. A stream
here is a sequential sequence of values which may take some amount of time
in between to produce.</p>
<p>A stream may request that it is blocked between values while the next value
is calculated, and provides a way to get notified once the next value is
ready as well.</p>
<p>You can find more information/tutorials about streams <a href="https://tokio.rs/docs/getting-started/streams-and-sinks/">online at
https://tokio.rs</a></p>
</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
<table>
<tr class=' module-item'>
<td><a class="mod" href="futures_unordered/index.html"
title='mod tokio::prelude::stream::futures_unordered'>futures_unordered</a></td>
<td class='docblock-short'>
<p>An unbounded set of futures.</p>
</td>
</tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table>
<tr class=' module-item'>
<td><a class="struct" href="struct.AndThen.html"
title='struct tokio::prelude::stream::AndThen'>AndThen</a></td>
<td class='docblock-short'>
<p>A stream combinator which chains a computation onto values produced by a
stream.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.BufferUnordered.html"
title='struct tokio::prelude::stream::BufferUnordered'>BufferUnordered</a></td>
<td class='docblock-short'>
<p>An adaptor for a stream of futures to execute the futures concurrently, if
possible, delivering results as they become available.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Buffered.html"
title='struct tokio::prelude::stream::Buffered'>Buffered</a></td>
<td class='docblock-short'>
<p>An adaptor for a stream of futures to execute the futures concurrently, if
possible.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.CatchUnwind.html"
title='struct tokio::prelude::stream::CatchUnwind'>CatchUnwind</a></td>
<td class='docblock-short'>
<p>Stream for the <code>catch_unwind</code> combinator.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Chain.html"
title='struct tokio::prelude::stream::Chain'>Chain</a></td>
<td class='docblock-short'>
<p>An adapter for chaining the output of two streams.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Chunks.html"
title='struct tokio::prelude::stream::Chunks'>Chunks</a></td>
<td class='docblock-short'>
<p>An adaptor that chunks up elements in a vector.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Collect.html"
title='struct tokio::prelude::stream::Collect'>Collect</a></td>
<td class='docblock-short'>
<p>A future which collects all of the values of a stream into a vector.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Concat.html"
title='struct tokio::prelude::stream::Concat'>Concat</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>A stream combinator to concatenate the results of a stream into the first
yielded item.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Concat2.html"
title='struct tokio::prelude::stream::Concat2'>Concat2</a></td>
<td class='docblock-short'>
<p>A stream combinator to concatenate the results of a stream into the first
yielded item.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Empty.html"
title='struct tokio::prelude::stream::Empty'>Empty</a></td>
<td class='docblock-short'>
<p>A stream which contains no elements.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Filter.html"
title='struct tokio::prelude::stream::Filter'>Filter</a></td>
<td class='docblock-short'>
<p>A stream combinator used to filter the results of a stream and only yield
some values.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FilterMap.html"
title='struct tokio::prelude::stream::FilterMap'>FilterMap</a></td>
<td class='docblock-short'>
<p>A combinator used to filter the results of a stream and simultaneously map
them to a different type.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Flatten.html"
title='struct tokio::prelude::stream::Flatten'>Flatten</a></td>
<td class='docblock-short'>
<p>A combinator used to flatten a stream-of-streams into one long stream of
elements.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Fold.html"
title='struct tokio::prelude::stream::Fold'>Fold</a></td>
<td class='docblock-short'>
<p>A future used to collect all the results of a stream into one generic type.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ForEach.html"
title='struct tokio::prelude::stream::ForEach'>ForEach</a></td>
<td class='docblock-short'>
<p>A stream combinator which executes a unit closure over each item on a
stream.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Forward.html"
title='struct tokio::prelude::stream::Forward'>Forward</a></td>
<td class='docblock-short'>
<p>Future for the <code>Stream::forward</code> combinator, which sends a stream of values
to a sink and then waits until the sink has fully flushed those values.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FromErr.html"
title='struct tokio::prelude::stream::FromErr'>FromErr</a></td>
<td class='docblock-short'>
<p>A stream combinator to change the error type of a stream.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Fuse.html"
title='struct tokio::prelude::stream::Fuse'>Fuse</a></td>
<td class='docblock-short'>
<p>A stream which &quot;fuse&quot;s a stream once it's terminated.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FutureSender.html"
title='struct tokio::prelude::stream::FutureSender'>FutureSender</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>Future returned by <code>Sender::send</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FuturesOrdered.html"
title='struct tokio::prelude::stream::FuturesOrdered'>FuturesOrdered</a></td>
<td class='docblock-short'>
<p>An unbounded queue of futures.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.FuturesUnordered.html"
title='struct tokio::prelude::stream::FuturesUnordered'>FuturesUnordered</a></td>
<td class='docblock-short'>
<p>An unbounded set of futures.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Inspect.html"
title='struct tokio::prelude::stream::Inspect'>Inspect</a></td>
<td class='docblock-short'>
<p>Do something with the items of a stream, passing it on.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.InspectErr.html"
title='struct tokio::prelude::stream::InspectErr'>InspectErr</a></td>
<td class='docblock-short'>
<p>Do something with the error of a stream, passing it on.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.IterOk.html"
title='struct tokio::prelude::stream::IterOk'>IterOk</a></td>
<td class='docblock-short'>
<p>A stream which is just a shim over an underlying instance of <code>Iterator</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.IterResult.html"
title='struct tokio::prelude::stream::IterResult'>IterResult</a></td>
<td class='docblock-short'>
<p>A stream which is just a shim over an underlying instance of <code>Iterator</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.IterStream.html"
title='struct tokio::prelude::stream::IterStream'>IterStream</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>A stream which is just a shim over an underlying instance of <code>Iterator</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Map.html"
title='struct tokio::prelude::stream::Map'>Map</a></td>
<td class='docblock-short'>
<p>A stream combinator which will change the type of a stream from one
type to another.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.MapErr.html"
title='struct tokio::prelude::stream::MapErr'>MapErr</a></td>
<td class='docblock-short'>
<p>A stream combinator which will change the error type of a stream from one
type to another.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Merge.html"
title='struct tokio::prelude::stream::Merge'>Merge</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>An adapter for merging the output of two streams.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Once.html"
title='struct tokio::prelude::stream::Once'>Once</a></td>
<td class='docblock-short'>
<p>A stream which emits single element and then EOF.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.OrElse.html"
title='struct tokio::prelude::stream::OrElse'>OrElse</a></td>
<td class='docblock-short'>
<p>A stream combinator which chains a computation onto errors produced by a
stream.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Peekable.html"
title='struct tokio::prelude::stream::Peekable'>Peekable</a></td>
<td class='docblock-short'>
<p>A <code>Stream</code> that implements a <code>peek</code> method.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.PollFn.html"
title='struct tokio::prelude::stream::PollFn'>PollFn</a></td>
<td class='docblock-short'>
<p>A stream which adapts a function returning <code>Poll</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Receiver.html"
title='struct tokio::prelude::stream::Receiver'>Receiver</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>The receiving end of a channel which implements the <code>Stream</code> trait.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Repeat.html"
title='struct tokio::prelude::stream::Repeat'>Repeat</a></td>
<td class='docblock-short'>
<p>Stream that produces the same element repeatedly.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ReuniteError.html"
title='struct tokio::prelude::stream::ReuniteError'>ReuniteError</a></td>
<td class='docblock-short'>
<p>Error indicating a <code>SplitSink&lt;S&gt;</code> and <code>SplitStream&lt;S&gt;</code> were not two halves
of a <code>Stream + Split</code>, and thus could not be <code>reunite</code>d.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Select.html"
title='struct tokio::prelude::stream::Select'>Select</a></td>
<td class='docblock-short'>
<p>An adapter for merging the output of two streams.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.SendError.html"
title='struct tokio::prelude::stream::SendError'>SendError</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>Error type for sending, used when the receiving end of the channel is dropped</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Sender.html"
title='struct tokio::prelude::stream::Sender'>Sender</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>The transmission end of a channel which is used to send values.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Skip.html"
title='struct tokio::prelude::stream::Skip'>Skip</a></td>
<td class='docblock-short'>
<p>A stream combinator which skips a number of elements before continuing.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.SkipWhile.html"
title='struct tokio::prelude::stream::SkipWhile'>SkipWhile</a></td>
<td class='docblock-short'>
<p>A stream combinator which skips elements of a stream while a predicate
holds.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.SplitSink.html"
title='struct tokio::prelude::stream::SplitSink'>SplitSink</a></td>
<td class='docblock-short'>
<p>A <code>Sink</code> part of the split pair</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.SplitStream.html"
title='struct tokio::prelude::stream::SplitStream'>SplitStream</a></td>
<td class='docblock-short'>
<p>A <code>Stream</code> part of the split pair</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.StreamFuture.html"
title='struct tokio::prelude::stream::StreamFuture'>StreamFuture</a></td>
<td class='docblock-short'>
<p>A combinator used to temporarily convert a stream into a future.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Take.html"
title='struct tokio::prelude::stream::Take'>Take</a></td>
<td class='docblock-short'>
<p>A stream combinator which returns a maximum number of elements.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.TakeWhile.html"
title='struct tokio::prelude::stream::TakeWhile'>TakeWhile</a></td>
<td class='docblock-short'>
<p>A stream combinator which takes elements from a stream while a predicate
holds.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Then.html"
title='struct tokio::prelude::stream::Then'>Then</a></td>
<td class='docblock-short'>
<p>A stream combinator which chains a computation onto each item produced by a
stream.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Unfold.html"
title='struct tokio::prelude::stream::Unfold'>Unfold</a></td>
<td class='docblock-short'>
<p>A stream which creates futures, polls them and return their result</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Wait.html"
title='struct tokio::prelude::stream::Wait'>Wait</a></td>
<td class='docblock-short'>
<p>A stream combinator which converts an asynchronous stream to a <strong>blocking
iterator</strong>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Zip.html"
title='struct tokio::prelude::stream::Zip'>Zip</a></td>
<td class='docblock-short'>
<p>An adapter for merging the output of two streams.</p>
</td>
</tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
<table>
<tr class=' module-item'>
<td><a class="enum" href="enum.MergedItem.html"
title='enum tokio::prelude::stream::MergedItem'>MergedItem</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>An item returned from a merge stream, which represents an item from one or
both of the underlying streams.</p>
</td>
</tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
<table>
<tr class=' module-item'>
<td><a class="trait" href="trait.Stream.html"
title='trait tokio::prelude::stream::Stream'>Stream</a></td>
<td class='docblock-short'>
<p>A stream of values, not all of which may have been produced yet.</p>
</td>
</tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
<table>
<tr class=' module-item'>
<td><a class="fn" href="fn.channel.html"
title='fn tokio::prelude::stream::channel'>channel</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>Creates an in-memory channel implementation of the <code>Stream</code> trait.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.empty.html"
title='fn tokio::prelude::stream::empty'>empty</a></td>
<td class='docblock-short'>
<p>Creates a stream which contains no elements.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.futures_ordered.html"
title='fn tokio::prelude::stream::futures_ordered'>futures_ordered</a></td>
<td class='docblock-short'>
<p>Converts a list of futures into a <code>Stream</code> of results from the futures.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.futures_unordered.html"
title='fn tokio::prelude::stream::futures_unordered'>futures_unordered</a></td>
<td class='docblock-short'>
<p>Converts a list of futures into a <code>Stream</code> of results from the futures.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.iter.html"
title='fn tokio::prelude::stream::iter'>iter</a></td>
<td class='docblock-short'>
[<div class='stab deprecated'>Deprecated</div>] <p>Converts an <code>Iterator</code> over <code>Result</code>s into a <code>Stream</code> which is always ready
to yield the next value.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.iter_ok.html"
title='fn tokio::prelude::stream::iter_ok'>iter_ok</a></td>
<td class='docblock-short'>
<p>Converts an <code>Iterator</code> into a <code>Stream</code> which is always ready
to yield the next value.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.iter_result.html"
title='fn tokio::prelude::stream::iter_result'>iter_result</a></td>
<td class='docblock-short'>
<p>Converts an <code>Iterator</code> over <code>Result</code>s into a <code>Stream</code> which is always ready
to yield the next value.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.once.html"
title='fn tokio::prelude::stream::once'>once</a></td>
<td class='docblock-short'>
<p>Creates a stream of single element</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.poll_fn.html"
title='fn tokio::prelude::stream::poll_fn'>poll_fn</a></td>
<td class='docblock-short'>
<p>Creates a new stream wrapping around a function returning <code>Poll</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.repeat.html"
title='fn tokio::prelude::stream::repeat'>repeat</a></td>
<td class='docblock-short'>
<p>Create a stream which produces the same item repeatedly.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.unfold.html"
title='fn tokio::prelude::stream::unfold'>unfold</a></td>
<td class='docblock-short'>
<p>Creates a <code>Stream</code> from a seed and a closure returning a <code>Future</code>.</p>
</td>
</tr></table></section>
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<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
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