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</pre><pre class="rust ">
<span class="kw">use</span> {<span class="ident">Future</span>, <span class="ident">Poll</span>, <span class="ident">Async</span>};
<span class="kw">use</span> <span class="ident">future</span>::<span class="ident">Either</span>;
<span class="doccomment">/// Future for the `select2` combinator, waiting for one of two differently-typed</span>
<span class="doccomment">/// futures to complete.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is created by the [`Future::select2`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Future::select2`]: trait.Future.html#method.select2</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"futures do nothing unless polled"</span>]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Select2</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="prelude-ty">Option</span><span class="op"><</span>(<span class="ident">A</span>, <span class="ident">B</span>)<span class="op">></span>,
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">A</span>, <span class="ident">b</span>: <span class="ident">B</span>) <span class="op">-></span> <span class="ident">Select2</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> {
<span class="ident">Select2</span> { <span class="ident">inner</span>: <span class="prelude-val">Some</span>((<span class="ident">a</span>, <span class="ident">b</span>)) }
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">Select2</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">B</span><span class="op">></span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Future</span>, <span class="ident">B</span>: <span class="ident">Future</span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Either</span><span class="op"><</span>(<span class="ident">A</span>::<span class="ident">Item</span>, <span class="ident">B</span>), (<span class="ident">B</span>::<span class="ident">Item</span>, <span class="ident">A</span>)<span class="op">></span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">Either</span><span class="op"><</span>(<span class="ident">A</span>::<span class="ident">Error</span>, <span class="ident">B</span>), (<span class="ident">B</span>::<span class="ident">Error</span>, <span class="ident">A</span>)<span class="op">></span>;
<span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">a</span>, <span class="kw-2">mut</span> <span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">take</span>().<span class="ident">expect</span>(<span class="string">"cannot poll Select2 twice"</span>);
<span class="kw">match</span> <span class="ident">a</span>.<span class="ident">poll</span>() {
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Either</span>::<span class="ident">A</span>((<span class="ident">e</span>, <span class="ident">b</span>))),
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="ident">x</span>)) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="ident">Either</span>::<span class="ident">A</span>((<span class="ident">x</span>, <span class="ident">b</span>)))),
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>) <span class="op">=></span> <span class="kw">match</span> <span class="ident">b</span>.<span class="ident">poll</span>() {
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">Either</span>::<span class="ident">B</span>((<span class="ident">e</span>, <span class="ident">a</span>))),
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="ident">x</span>)) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="ident">Either</span>::<span class="ident">B</span>((<span class="ident">x</span>, <span class="ident">a</span>)))),
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">inner</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="ident">a</span>, <span class="ident">b</span>));
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>)
}
}
}
}
}
</pre>
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