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</pre><pre class="rust ">
<span class="kw">use</span> {<span class="ident">Async</span>, <span class="ident">Future</span>, <span class="ident">IntoFuture</span>, <span class="ident">Poll</span>};
<span class="kw">use</span> <span class="ident">stream</span>::<span class="ident">Stream</span>;
<span class="doccomment">/// A stream combinator which executes a unit closure over each item on a</span>
<span class="doccomment">/// stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This structure is returned by the `Stream::for_each` method.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"streams do nothing unless polled"</span>]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ForEach</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">F</span>, <span class="ident">U</span><span class="op">></span> <span class="kw">where</span> <span class="ident">U</span>: <span class="ident">IntoFuture</span> {
<span class="ident">stream</span>: <span class="ident">S</span>,
<span class="ident">f</span>: <span class="ident">F</span>,
<span class="ident">fut</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">U</span>::<span class="ident">Future</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">S</span>, <span class="ident">F</span>, <span class="ident">U</span><span class="op">></span>(<span class="ident">s</span>: <span class="ident">S</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">ForEach</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">F</span>, <span class="ident">U</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">S</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">U</span>,
<span class="ident">U</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> (), <span class="ident">Error</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="ident">ForEach</span> {
<span class="ident">stream</span>: <span class="ident">s</span>,
<span class="ident">f</span>: <span class="ident">f</span>,
<span class="ident">fut</span>: <span class="prelude-val">None</span>,
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">F</span>, <span class="ident">U</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">ForEach</span><span class="op"><</span><span class="ident">S</span>, <span class="ident">F</span>, <span class="ident">U</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">S</span>::<span class="ident">Item</span>) <span class="op">-></span> <span class="ident">U</span>,
<span class="ident">U</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span> (), <span class="ident">Error</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> ();
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">Error</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="ident">S</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">fut</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">fut</span>.<span class="ident">take</span>() {
<span class="kw">if</span> <span class="ident">fut</span>.<span class="ident">poll</span>()<span class="question-mark">?</span>.<span class="ident">is_not_ready</span>() {
<span class="self">self</span>.<span class="ident">fut</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">fut</span>);
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>);
}
}
<span class="kw">match</span> <span class="macro">try_ready</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll</span>()) {
<span class="prelude-val">Some</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="self">self</span>.<span class="ident">fut</span> <span class="op">=</span> <span class="prelude-val">Some</span>((<span class="self">self</span>.<span class="ident">f</span>)(<span class="ident">e</span>).<span class="ident">into_future</span>()),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(())),
}
}
}
}
</pre>
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