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638 lines
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<title>futures::stream - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Module stream</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#reexports">Re-exports</a></li><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'><a href='../index.html'>futures</a></p><script>window.sidebarCurrent = {name: 'stream', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>futures</a>::<wbr><a class="mod" href=''>stream</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/futures/stream/mod.rs.html#1-1145' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>Asynchronous streams</p>
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<p>This module contains the <code>Stream</code> trait and a number of adaptors for this
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trait. This trait is very similar to the <code>Iterator</code> trait in the standard
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library except that it expresses the concept of blocking as well. A stream
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here is a sequential sequence of values which may take some amount of time
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in between to produce.</p>
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<p>A stream may request that it is blocked between values while the next value
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is calculated, and provides a way to get notified once the next value is
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ready as well.</p>
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<p>You can find more information/tutorials about streams <a href="https://tokio.rs/docs/getting-started/streams-and-sinks/">online at
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https://tokio.rs</a></p>
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</div><h2 id='reexports' class='section-header'><a href="#reexports">Re-exports</a></h2>
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||
<table><tr><td><code>pub use self::futures_unordered::<a class="struct" href="../../futures/stream/futures_unordered/struct.FuturesUnordered.html" title="struct futures::stream::futures_unordered::FuturesUnordered">FuturesUnordered</a>;</code></td></tr></table><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="mod" href="futures_unordered/index.html"
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||
title='mod futures::stream::futures_unordered'>futures_unordered</a></td>
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||
<td class='docblock-short'>
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||
<p>An unbounded set of futures.</p>
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||
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</td>
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</tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.AndThen.html"
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title='struct futures::stream::AndThen'>AndThen</a></td>
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<td class='docblock-short'>
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<p>A stream combinator which chains a computation onto values produced by a
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stream.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.BufferUnordered.html"
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title='struct futures::stream::BufferUnordered'>BufferUnordered</a></td>
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<td class='docblock-short'>
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<p>An adaptor for a stream of futures to execute the futures concurrently, if
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||
possible, delivering results as they become available.</p>
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||
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||
</td>
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||
</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Buffered.html"
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title='struct futures::stream::Buffered'>Buffered</a></td>
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||
<td class='docblock-short'>
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||
<p>An adaptor for a stream of futures to execute the futures concurrently, if
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||
possible.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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<td><a class="struct" href="struct.CatchUnwind.html"
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||
title='struct futures::stream::CatchUnwind'>CatchUnwind</a></td>
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||
<td class='docblock-short'>
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<p>Stream for the <code>catch_unwind</code> combinator.</p>
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||
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Chain.html"
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title='struct futures::stream::Chain'>Chain</a></td>
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||
<td class='docblock-short'>
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<p>An adapter for chaining the output of two streams.</p>
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||
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</td>
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||
</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Chunks.html"
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title='struct futures::stream::Chunks'>Chunks</a></td>
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||
<td class='docblock-short'>
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<p>An adaptor that chunks up elements in a vector.</p>
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||
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||
</td>
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||
</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Collect.html"
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title='struct futures::stream::Collect'>Collect</a></td>
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||
<td class='docblock-short'>
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<p>A future which collects all of the values of a stream into a vector.</p>
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||
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||
</td>
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||
</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Concat.html"
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||
title='struct futures::stream::Concat'>Concat</a></td>
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||
<td class='docblock-short'>
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[<div class='stab deprecated'>Deprecated</div>] <p>A stream combinator to concatenate the results of a stream into the first
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yielded item.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Concat2.html"
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||
title='struct futures::stream::Concat2'>Concat2</a></td>
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||
<td class='docblock-short'>
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||
<p>A stream combinator to concatenate the results of a stream into the first
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||
yielded item.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Empty.html"
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||
title='struct futures::stream::Empty'>Empty</a></td>
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||
<td class='docblock-short'>
|
||
<p>A stream which contains no elements.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Filter.html"
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||
title='struct futures::stream::Filter'>Filter</a></td>
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||
<td class='docblock-short'>
|
||
<p>A stream combinator used to filter the results of a stream and only yield
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||
some values.</p>
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||
|
||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.FilterMap.html"
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||
title='struct futures::stream::FilterMap'>FilterMap</a></td>
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||
<td class='docblock-short'>
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||
<p>A combinator used to filter the results of a stream and simultaneously map
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||
them to a different type.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Flatten.html"
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||
title='struct futures::stream::Flatten'>Flatten</a></td>
|
||
<td class='docblock-short'>
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||
<p>A combinator used to flatten a stream-of-streams into one long stream of
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||
elements.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Fold.html"
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||
title='struct futures::stream::Fold'>Fold</a></td>
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||
<td class='docblock-short'>
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||
<p>A future used to collect all the results of a stream into one generic type.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.ForEach.html"
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||
title='struct futures::stream::ForEach'>ForEach</a></td>
|
||
<td class='docblock-short'>
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||
<p>A stream combinator which executes a unit closure over each item on a
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||
stream.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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<td><a class="struct" href="struct.Forward.html"
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||
title='struct futures::stream::Forward'>Forward</a></td>
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||
<td class='docblock-short'>
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||
<p>Future for the <code>Stream::forward</code> combinator, which sends a stream of values
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||
to a sink and then waits until the sink has fully flushed those values.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.FromErr.html"
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||
title='struct futures::stream::FromErr'>FromErr</a></td>
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||
<td class='docblock-short'>
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||
<p>A stream combinator to change the error type of a stream.</p>
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||
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||
</td>
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||
</tr>
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||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Fuse.html"
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||
title='struct futures::stream::Fuse'>Fuse</a></td>
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||
<td class='docblock-short'>
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||
<p>A stream which "fuse"s a stream once it's terminated.</p>
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||
|
||
</td>
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||
</tr>
|
||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.FuturesOrdered.html"
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||
title='struct futures::stream::FuturesOrdered'>FuturesOrdered</a></td>
|
||
<td class='docblock-short'>
|
||
<p>An unbounded queue of futures.</p>
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||
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||
</td>
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||
</tr>
|
||
<tr class=' module-item'>
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||
<td><a class="struct" href="struct.Inspect.html"
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||
title='struct futures::stream::Inspect'>Inspect</a></td>
|
||
<td class='docblock-short'>
|
||
<p>Do something with the items of a stream, passing it on.</p>
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||
|
||
</td>
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||
</tr>
|
||
<tr class=' module-item'>
|
||
<td><a class="struct" href="struct.InspectErr.html"
|
||
title='struct futures::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.Iter.html"
|
||
title='struct futures::stream::Iter'>Iter</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.IterOk.html"
|
||
title='struct futures::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 futures::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'>
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||
<td><a class="struct" href="struct.IterStream.html"
|
||
title='struct futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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.Repeat.html"
|
||
title='struct futures::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 futures::stream::ReuniteError'>ReuniteError</a></td>
|
||
<td class='docblock-short'>
|
||
<p>Error indicating a <code>SplitSink<S></code> and <code>SplitStream<S></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 futures::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.Skip.html"
|
||
title='struct futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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.empty.html"
|
||
title='fn futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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 futures::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>
|
||
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Prefix searches with a type followed by a colon (e.g.
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Accepted types are: <code>fn</code>, <code>mod</code>,
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Search functions by type signature (e.g.
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