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<title>rand::distributions::WeightedChoice - Rust</title>
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<p class='location'>Struct WeightedChoice</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-IndependentSample%3CT%3E">IndependentSample<T></a><a href="#impl-Sample%3CT%3E">Sample<T></a></div></div><p class='location'><a href='../index.html'>rand</a>::<wbr><a href='index.html'>distributions</a></p><script>window.sidebarCurrent = {name: 'WeightedChoice', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>rand</a>::<wbr><a href='index.html'>distributions</a>::<wbr><a class="struct" href=''>WeightedChoice</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/rand/distributions/mod.rs.html#126-129' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct WeightedChoice<'a, T> <span class="where fmt-newline">where<br> T: 'a, </span> { /* fields omitted */ }</pre><div class='docblock'><p>A distribution that selects from a finite collection of weighted items.</p>
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<p>Each item has an associated weight that influences how likely it
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is to be chosen: higher weight is more likely.</p>
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<p>The <code>Clone</code> restriction is a limitation of the <code>Sample</code> and
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<code>IndependentSample</code> traits. Note that <code>&T</code> is (cheaply) <code>Clone</code> for
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all <code>T</code>, as is <code>u32</code>, so one can store references or indices into
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another vector.</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">distributions</span>::{<span class="ident">Weighted</span>, <span class="ident">WeightedChoice</span>, <span class="ident">IndependentSample</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">items</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>(<span class="ident">Weighted</span> { <span class="ident">weight</span>: <span class="number">2</span>, <span class="ident">item</span>: <span class="string">'a'</span> },
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<span class="ident">Weighted</span> { <span class="ident">weight</span>: <span class="number">4</span>, <span class="ident">item</span>: <span class="string">'b'</span> },
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<span class="ident">Weighted</span> { <span class="ident">weight</span>: <span class="number">1</span>, <span class="ident">item</span>: <span class="string">'c'</span> });
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<span class="kw">let</span> <span class="ident">wc</span> <span class="op">=</span> <span class="ident">WeightedChoice</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">items</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">rand</span>::<span class="ident">thread_rng</span>();
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<span class="kw">for</span> _ <span class="kw">in</span> <span class="number">0</span>..<span class="number">16</span> {
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<span class="comment">// on average prints 'a' 4 times, 'b' 8 and 'c' twice.</span>
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">wc</span>.<span class="ident">ind_sample</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">rng</span>));
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}</pre>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl<'a, T> <a class="struct" href="../../rand/distributions/struct.WeightedChoice.html" title="struct rand::distributions::WeightedChoice">WeightedChoice</a><'a, T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#131-166' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>(items: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a mut [</a><a class="struct" href="../../rand/distributions/struct.Weighted.html" title="struct rand::distributions::Weighted">Weighted</a><T><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -> <a class="struct" href="../../rand/distributions/struct.WeightedChoice.html" title="struct rand::distributions::WeightedChoice">WeightedChoice</a><'a, T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#139-165' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Create a new <code>WeightedChoice</code>.</p>
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<p>Panics if:</p>
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<ul>
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<li><code>items</code> is empty</li>
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<li>the total weight is 0</li>
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<li>the total weight is larger than a <code>u32</code> can contain.</li>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl<'a, T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../rand/distributions/struct.WeightedChoice.html" title="struct rand::distributions::WeightedChoice">WeightedChoice</a><'a, T> <span class="where fmt-newline">where<br> T: 'a + <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, </span></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#125' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#125' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-IndependentSample%3CT%3E' class='impl'><span class='in-band'><code>impl<'a, T> <a class="trait" href="../../rand/distributions/trait.IndependentSample.html" title="trait rand::distributions::IndependentSample">IndependentSample</a><T> for <a class="struct" href="../../rand/distributions/struct.WeightedChoice.html" title="struct rand::distributions::WeightedChoice">WeightedChoice</a><'a, T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></code><a href='#impl-IndependentSample%3CT%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#172-213' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.ind_sample' class="method"><span id='ind_sample.v' class='invisible'><code>fn <a href='../../rand/distributions/trait.IndependentSample.html#tymethod.ind_sample' class='fnname'>ind_sample</a><R>(&self, rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R) -> T <span class="where fmt-newline">where<br> R: <a class="trait" href="../../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#173-212' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Generate a random value.</p>
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</div></div><h3 id='impl-Sample%3CT%3E' class='impl'><span class='in-band'><code>impl<'a, T> <a class="trait" href="../../rand/distributions/trait.Sample.html" title="trait rand::distributions::Sample">Sample</a><T> for <a class="struct" href="../../rand/distributions/struct.WeightedChoice.html" title="struct rand::distributions::WeightedChoice">WeightedChoice</a><'a, T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></code><a href='#impl-Sample%3CT%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/rand/distributions/mod.rs.html#168-170' title='goto source code'>[src]</a></span></h3>
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<div class='docblock'><p>Generate a random value of <code>Support</code>, using <code>rng</code> as the source of randomness. <a href="../../rand/distributions/trait.Sample.html#tymethod.sample">Read more</a></p>
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