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<meta name="description" content="API documentation for the Rust `Sender` struct in crate `futures`.">
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<title>futures::sync::oneshot::Sender - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Struct Sender</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.send">send</a><a href="#method.poll_cancel">poll_cancel</a><a href="#method.is_canceled">is_canceled</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Drop">Drop</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../../index.html'>futures</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>oneshot</a></p><script>window.sidebarCurrent = {name: 'Sender', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>futures</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>oneshot</a>::<wbr><a class="struct" href=''>Sender</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/futures/sync/oneshot.rs.html#29-31' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Sender<T> { /* fields omitted */ }</pre></div><div class='docblock'><p>Represents the completion half of a oneshot through which the result of a
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computation is signaled.</p>
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<p>This is created by the <code>oneshot::channel</code> function.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a><T></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#305-371' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.send' class="method"><span id='send.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.send' class='fnname'>send</a>(self, t: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, T></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#323-325' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Completes this oneshot with a successful result.</p>
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<p>This function will consume <code>self</code> and indicate to the other end, the
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<code>Receiver</code>, that the value provided is the result of the computation this
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represents.</p>
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<p>If the value is successfully enqueued for the remote end to receive,
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then <code>Ok(())</code> is returned. If the receiving end was deallocated before
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this function was called, however, then <code>Err</code> is returned with the value
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provided.</p>
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</div><h4 id='method.poll_cancel' class="method"><span id='poll_cancel.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.poll_cancel' class='fnname'>poll_cancel</a>(&mut self) -> <a class="type" href="../../../futures/type.Poll.html" title="type futures::Poll">Poll</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#351-353' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Polls this <code>Sender</code> half to detect whether the <code>Receiver</code> this has
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paired with has gone away.</p>
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<p>This function can be used to learn about when the <code>Receiver</code> (consumer)
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half has gone away and nothing will be able to receive a message sent
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from <code>send</code>.</p>
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<p>If <code>Ready</code> is returned then it means that the <code>Receiver</code> has disappeared
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and the result this <code>Sender</code> would otherwise produce should no longer
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be produced.</p>
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<p>If <code>NotReady</code> is returned then the <code>Receiver</code> is still alive and may be
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able to receive a message if sent. The current task, however, is
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scheduled to receive a notification if the corresponding <code>Receiver</code> goes
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away.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>Like <code>Future::poll</code>, this function will panic if it's not called from
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within the context of a task. In other words, this should only ever be
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called from inside another future.</p>
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<p>If you're calling this function from a context that does not have a
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task, then you can use the <code>is_canceled</code> API instead.</p>
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</div><h4 id='method.is_canceled' class="method"><span id='is_canceled.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.is_canceled' class='fnname'>is_canceled</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#368-370' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Tests to see whether this <code>Sender</code>'s corresponding <code>Receiver</code>
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has gone away.</p>
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<p>This function can be used to learn about when the <code>Receiver</code> (consumer)
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half has gone away and nothing will be able to receive a message sent
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from <code>send</code>.</p>
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<p>Note that this function is intended to <em>not</em> be used in the context of a
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future. If you're implementing a future you probably want to call the
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<code>poll_cancel</code> function which will block the current task if the
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cancellation hasn't happened yet. This can be useful when working on a
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non-futures related thread, though, which would otherwise panic if
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<code>poll_cancel</code> were called.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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<div id='implementations-list'>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a><T></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#28' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#28' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Drop' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a><T></code><a href='#impl-Drop' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#373-377' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&mut self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/futures/sync/oneshot.rs.html#374-376' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
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<h2 id='synthetic-implementations' class='small-section-header'>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../../futures/sync/oneshot/struct.Sender.html" title="struct futures::sync::oneshot::Sender">Sender</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section>
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