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157 lines
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<title>chan::async - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'><a href='index.html'>chan</a></p><script>window.sidebarCurrent = {name: 'async', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>chan</a>::<wbr><a class="fn" href=''>async</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/chan/lib.rs.html#523-527' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn async<T>() -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="struct" href="../chan/struct.Sender.html" title="struct chan::Sender">Sender</a><T>, <a class="struct" href="../chan/struct.Receiver.html" title="struct chan::Receiver">Receiver</a><T><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></pre><div class='docblock'><p>Create an asynchronous channel with an unbounded buffer.</p>
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<p>Since the buffer is unbounded, send operations always succeed immediately.</p>
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<p>Receive operations succeed only when there is at least one value in the
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buffer.</p>
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<p>Values are guaranteed to be received in the same order that they are sent.</p>
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<p>The send and receive values returned can be cloned arbitrarily (i.e.,
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multi-producer/multi-consumer) and moved to other threads.</p>
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<p>When all senders are dropped, the channel is closed automatically. No
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more values may be sent on a closed channel. Once a channel is closed and
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the buffer is empty, all receive operations return <code>None</code> immediately.
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(If a channel is closed and there are still values in the buffer, then
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receive operations will retrieve those first.)</p>
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<p>When all receivers are dropped, no special action is taken. When the buffer
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is full, all subsequent send operations will block indefinitely.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<p>Asynchronous channels are nice when you just want to enqueue a bunch
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of values up front:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">chan</span>::<span class="ident">async</span>();
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<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10</span> {
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<span class="ident">s</span>.<span class="ident">send</span>(<span class="ident">i</span>);
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}
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<span class="ident">drop</span>(<span class="ident">s</span>); <span class="comment">// closing the channel lets the iterator stop</span>
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<span class="kw">let</span> <span class="ident">numbers</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">iter</span>().<span class="ident">collect</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">numbers</span>, (<span class="number">0</span>..<span class="number">10</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>());</pre>
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<p>(Others should help me come up with more compelling examples of
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asynchronous channels.)</p>
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