138 lines
7.1 KiB
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138 lines
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<p class='location'><a href='../index.html'>rand</a>::<wbr><a href='index.html'>seq</a></p><script>window.sidebarCurrent = {name: 'sample_slice_ref', 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'>rand</a>::<wbr><a href='index.html'>seq</a>::<wbr><a class="fn" href=''>sample_slice_ref</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/rand/seq.rs.html#114-122' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn sample_slice_ref<'a, R, T>(<br> rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R, <br> slice: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [T]</a>, <br> amount: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T> <span class="where fmt-newline">where<br> R: <a class="trait" href="../../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></pre><div class='docblock'><p>Randomly sample exactly <code>amount</code> references from <code>slice</code>.</p>
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<p>The references are non-repeating and in random order.</p>
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<p>This implementation uses <code>O(amount)</code> time and memory.</p>
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<p>Panics if <code>amount > slice.len()</code></p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">rand</span>::{<span class="ident">thread_rng</span>, <span class="ident">seq</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
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<span class="kw">let</span> <span class="ident">values</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">7</span>];
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">seq</span>::<span class="ident">sample_slice_ref</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">rng</span>, <span class="kw-2">&</span><span class="ident">values</span>, <span class="number">3</span>));</pre>
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