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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>
<pre class='rust fn'>pub fn poll_fn&lt;T, E, F&gt;(f: F) -&gt; <a class="struct" href="../../futures/future/struct.PollFn.html" title="struct futures::future::PollFn">PollFn</a>&lt;F&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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>() -&gt; <a class="type" href="../../futures/type.Poll.html" title="type futures::Poll">Poll</a>&lt;T, E&gt;,&nbsp;</span></pre><div class='docblock'><p>Creates a new future wrapping around a function returning <code>Poll</code>.</p>
<p>Polling the returned future delegates to the wrapped function.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">future</span>::<span class="ident">poll_fn</span>;
<span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Async</span>, <span class="ident">Poll</span>};

<span class="kw">fn</span> <span class="ident">read_line</span>() <span class="op">-&gt;</span> <span class="ident">Poll</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
    <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="string">&quot;Hello, World!&quot;</span>.<span class="ident">into</span>()))
}

<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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