139 lines
6.3 KiB
HTML
139 lines
6.3 KiB
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<title>futures::future::poll_fn - Rust</title>
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<p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>future</a></p><script>window.sidebarCurrent = {name: 'poll_fn', 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'>futures</a>::<wbr><a href='index.html'>future</a>::<wbr><a class="fn" href=''>poll_fn</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/futures/future/poll_fn.rs.html#30-34' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn poll_fn<T, E, F>(f: F) -> <a class="struct" href="../../futures/future/struct.PollFn.html" title="struct futures::future::PollFn">PollFn</a><F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>() -> <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a><T, E>, </span></pre><div class='docblock'><p>Creates a new future wrapping around a function returning <code>Poll</code>.</p>
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<p>Polling the returned future delegates to the wrapped function.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">future</span>::<span class="ident">poll_fn</span>;
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<span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Async</span>, <span class="ident">Poll</span>};
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<span class="kw">fn</span> <span class="ident">read_line</span>() <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="ident">String</span>, <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="string">"Hello, World!"</span>.<span class="ident">into</span>()))
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}
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<span class="kw">let</span> <span class="ident">read_future</span> <span class="op">=</span> <span class="ident">poll_fn</span>(<span class="ident">read_line</span>);</pre>
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