fn.channel.html 7.0 KB

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  45. <h1 class='fqn'><span class='in-band'>Function <a href='../../index.html'>futures</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>oneshot</a>::<wbr><a class="fn" href=''>channel</a></span><span class='out-of-band'><span id='render-detail'>
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  50. <pre class='rust fn'>pub fn channel&lt;T&gt;() -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a>&lt;T&gt;, <a class="struct" href="../../../futures/sync/oneshot/struct.Receiver.html" title="struct futures::sync::oneshot::Receiver">Receiver</a>&lt;T&gt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></pre><div class='docblock'><p>Creates a new futures-aware, one-shot channel.</p>
  51. <p>This function is similar to Rust's channels found in the standard library.
  52. Two halves are returned, the first of which is a <code>Sender</code> handle, used to
  53. signal the end of a computation and provide its value. The second half is a
  54. <code>Receiver</code> which implements the <code>Future</code> trait, resolving to the value that
  55. was given to the <code>Sender</code> handle.</p>
  56. <p>Each half can be separately owned and sent across threads/tasks.</p>
  57. <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
  58. <pre class="rust rust-example-rendered">
  59. <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
  60. <span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">sync</span>::<span class="ident">oneshot</span>;
  61. <span class="kw">use</span> <span class="ident">futures</span>::<span class="kw-2">*</span>;
  62. <span class="kw">let</span> (<span class="ident">p</span>, <span class="ident">c</span>) <span class="op">=</span> <span class="ident">oneshot</span>::<span class="ident">channel</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>();
  63. <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">||</span> {
  64. <span class="ident">c</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
  65. <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;got: {}&quot;</span>, <span class="ident">i</span>);
  66. }).<span class="ident">wait</span>();
  67. });
  68. <span class="ident">p</span>.<span class="ident">send</span>(<span class="number">3</span>).<span class="ident">unwrap</span>();</pre>
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