157 lines
8.6 KiB
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157 lines
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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: 'join_all', 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=''>join_all</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/futures/future/join_all.rs.html#76-84' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn join_all<I>(i: I) -> <a class="struct" href="../../futures/future/struct.JoinAll.html" title="struct futures::future::JoinAll">JoinAll</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a>,<br> I::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html#associatedtype.Item" title="type core::iter::traits::IntoIterator::Item">Item</a>: <a class="trait" href="../../futures/future/trait.IntoFuture.html" title="trait futures::future::IntoFuture">IntoFuture</a>, </span></pre><div class='docblock'><p>Creates a future which represents a collection of the results of the futures
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given.</p>
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<p>The returned future will drive execution for all of its underlying futures,
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collecting the results into a destination <code>Vec<T></code> in the same order as they
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were provided. If any future returns an error then all other futures will be
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canceled and an error will be returned immediately. If all futures complete
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successfully, however, then the returned future will succeed with a <code>Vec</code> of
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all the successful results.</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="kw-2">*</span>;
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<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">join_all</span>(<span class="macro">vec</span><span class="macro">!</span>[
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<span class="ident">ok</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">1</span>),
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<span class="ident">ok</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">2</span>),
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<span class="ident">ok</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">3</span>),
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]);
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<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
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});
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<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">join_all</span>(<span class="macro">vec</span><span class="macro">!</span>[
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<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">ok</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">1</span>)),
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<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">err</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">2</span>)),
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<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">ok</span>::<span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span>(<span class="number">3</span>)),
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]);
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<span class="kw">let</span> <span class="ident">f</span> <span class="op">=</span> <span class="ident">f</span>.<span class="ident">then</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="prelude-val">Err</span>(<span class="number">2</span>));
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<span class="ident">x</span>
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});</pre>
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