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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Generating random samples from probability distributions"><title>rand::distributions - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module distributions</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#the-standard-distribution" title="The `Standard` distribution">The <code>Standard</code> distribution</a><ul><li><a href="#random-characters" title="Random characters">Random characters</a></li></ul></li><li><a href="#uniform-numeric-ranges" title="Uniform numeric ranges">Uniform numeric ranges</a><ul><li><a href="#open-and-half-open-ranges" title="Open and half-open ranges">Open and half-open ranges</a></li></ul></li><li><a href="#non-uniform-sampling" title="Non-uniform sampling">Non-uniform sampling</a></li></ul><h3><a href="#modules">Module Items</a></h3><ul class="block"><li><a href="#modules" title="Modules">Modules</a></li><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#enums" title="Enums">Enums</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate rand</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">rand</a></span><h1>Module <span>distributions</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/rand/distributions/mod.rs.html#10-218">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Generating random samples from probability distributions</p>
<p>This module is the home of the <a href="trait.Distribution.html" title="trait rand::distributions::Distribution"><code>Distribution</code></a> trait and several of its
implementations. It is the workhorse behind some of the convenient
functionality of the <a href="../trait.Rng.html" title="trait rand::Rng"><code>Rng</code></a> trait, e.g. <a href="../trait.Rng.html#method.gen" title="method rand::Rng::gen"><code>Rng::gen</code></a> and of course
<a href="../trait.Rng.html#method.sample" title="method rand::Rng::sample"><code>Rng::sample</code></a>.</p>
<p>Abstractly, a <a href="https://en.wikipedia.org/wiki/Probability_distribution">probability distribution</a> describes the probability of
occurrence of each value in its sample space.</p>
<p>More concretely, an implementation of <code>Distribution&lt;T&gt;</code> for type <code>X</code> is an
algorithm for choosing values from the sample space (a subset of <code>T</code>)
according to the distribution <code>X</code> represents, using an external source of
randomness (an RNG supplied to the <code>sample</code> function).</p>
<p>A type <code>X</code> may implement <code>Distribution&lt;T&gt;</code> for multiple types <code>T</code>.
Any type implementing <a href="trait.Distribution.html" title="trait rand::distributions::Distribution"><code>Distribution</code></a> is stateless (i.e. immutable),
but it may have internal parameters set at construction time (for example,
<a href="struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a> allows specification of its sample space as a range within <code>T</code>).</p>
<h2 id="the-standard-distribution"><a class="doc-anchor" href="#the-standard-distribution">§</a>The <code>Standard</code> distribution</h2>
<p>The <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> distribution is important to mention. This is the
distribution used by <a href="../trait.Rng.html#method.gen" title="method rand::Rng::gen"><code>Rng::gen</code></a> and represents the “default” way to
produce a random value for many different types, including most primitive
types, tuples, arrays, and a few derived types. See the documentation of
<a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> for more details.</p>
<p>Implementing <code>Distribution&lt;T&gt;</code> for <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> for user types <code>T</code> makes it
possible to generate type <code>T</code> with <a href="../trait.Rng.html#method.gen" title="method rand::Rng::gen"><code>Rng::gen</code></a>, and by extension also
with the <a href="../fn.random.html" title="fn rand::random"><code>random</code></a> function.</p>
<h3 id="random-characters"><a class="doc-anchor" href="#random-characters">§</a>Random characters</h3>
<p><a href="struct.Alphanumeric.html" title="struct rand::distributions::Alphanumeric"><code>Alphanumeric</code></a> is a simple distribution to sample random letters and
numbers of the <code>char</code> type; in contrast <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> may sample any valid
<code>char</code>.</p>
<h2 id="uniform-numeric-ranges"><a class="doc-anchor" href="#uniform-numeric-ranges">§</a>Uniform numeric ranges</h2>
<p>The <a href="struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a> distribution is more flexible than <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a>, but also
more specialised: it supports fewer target types, but allows the sample
space to be specified as an arbitrary range within its target type <code>T</code>.
Both <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> and <a href="struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a> are in some sense uniform distributions.</p>
<p>Values may be sampled from this distribution using [<code>Rng::sample(Range)</code>] or
by creating a distribution object with <a href="struct.Uniform.html#method.new" title="associated function rand::distributions::Uniform::new"><code>Uniform::new</code></a>,
<a href="struct.Uniform.html#method.new_inclusive" title="associated function rand::distributions::Uniform::new_inclusive"><code>Uniform::new_inclusive</code></a> or <code>From&lt;Range&gt;</code>. When the range limits are not
known at compile time it is typically faster to reuse an existing
<code>Uniform</code> object than to call [<code>Rng::sample(Range)</code>].</p>
<p>User types <code>T</code> may also implement <code>Distribution&lt;T&gt;</code> for <a href="struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a>,
although this is less straightforward than for <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> (see the
documentation in the <a href="uniform/index.html" title="mod rand::distributions::uniform"><code>uniform</code></a> module). Doing so enables generation of
values of type <code>T</code> with [<code>Rng::sample(Range)</code>].</p>
<h3 id="open-and-half-open-ranges"><a class="doc-anchor" href="#open-and-half-open-ranges">§</a>Open and half-open ranges</h3>
<p>There are surprisingly many ways to uniformly generate random floats. A
range between 0 and 1 is standard, but the exact bounds (open vs closed)
and accuracy differ. In addition to the <a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> distribution Rand offers
<a href="struct.Open01.html" title="struct rand::distributions::Open01"><code>Open01</code></a> and <a href="struct.OpenClosed01.html" title="struct rand::distributions::OpenClosed01"><code>OpenClosed01</code></a>. See “Floating point implementation” section of
<a href="struct.Standard.html" title="struct rand::distributions::Standard"><code>Standard</code></a> documentation for more details.</p>
<h2 id="non-uniform-sampling"><a class="doc-anchor" href="#non-uniform-sampling">§</a>Non-uniform sampling</h2>
<p>Sampling a simple true/false outcome with a given probability has a name:
the <a href="struct.Bernoulli.html" title="struct rand::distributions::Bernoulli"><code>Bernoulli</code></a> distribution (this is used by <a href="../trait.Rng.html#method.gen_bool" title="method rand::Rng::gen_bool"><code>Rng::gen_bool</code></a>).</p>
<p>For weighted sampling from a sequence of discrete values, use the
<a href="struct.WeightedIndex.html" title="struct rand::distributions::WeightedIndex"><code>WeightedIndex</code></a> distribution.</p>
<p>This crate no longer includes other non-uniform distributions; instead
it is recommended that you use either <a href="https://crates.io/crates/rand_distr"><code>rand_distr</code></a> or <a href="https://crates.io/crates/statrs"><code>statrs</code></a>.</p>
</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="uniform/index.html" title="mod rand::distributions::uniform">uniform</a></div><div class="desc docblock-short">A distribution uniformly sampling numbers within a given range.</div></li><li><div class="item-name"><a class="mod" href="weighted/index.html" title="mod rand::distributions::weighted">weighted</a><wbr><span class="stab deprecated" title="">Deprecated</span></div><div class="desc docblock-short">Weighted index sampling</div></li></ul><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Alphanumeric.html" title="struct rand::distributions::Alphanumeric">Alphanumeric</a></div><div class="desc docblock-short">Sample a <code>u8</code>, uniformly distributed over ASCII letters and numbers:
a-z, A-Z and 0-9.</div></li><li><div class="item-name"><a class="struct" href="struct.Bernoulli.html" title="struct rand::distributions::Bernoulli">Bernoulli</a></div><div class="desc docblock-short">The Bernoulli distribution.</div></li><li><div class="item-name"><a class="struct" href="struct.DistIter.html" title="struct rand::distributions::DistIter">Dist<wbr>Iter</a></div><div class="desc docblock-short">An iterator that generates random values of <code>T</code> with distribution <code>D</code>,
using <code>R</code> as the source of randomness.</div></li><li><div class="item-name"><a class="struct" href="struct.DistMap.html" title="struct rand::distributions::DistMap">DistMap</a></div><div class="desc docblock-short">A distribution of values of type <code>S</code> derived from the distribution <code>D</code>
by mapping its output of type <code>T</code> through the closure <code>F</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.Open01.html" title="struct rand::distributions::Open01">Open01</a></div><div class="desc docblock-short">A distribution to sample floating point numbers uniformly in the open
interval <code>(0, 1)</code>, i.e. not including either endpoint.</div></li><li><div class="item-name"><a class="struct" href="struct.OpenClosed01.html" title="struct rand::distributions::OpenClosed01">Open<wbr>Closed01</a></div><div class="desc docblock-short">A distribution to sample floating point numbers uniformly in the half-open
interval <code>(0, 1]</code>, i.e. including 1 but not 0.</div></li><li><div class="item-name"><a class="struct" href="struct.Slice.html" title="struct rand::distributions::Slice">Slice</a></div><div class="desc docblock-short">A distribution to sample items uniformly from a slice.</div></li><li><div class="item-name"><a class="struct" href="struct.Standard.html" title="struct rand::distributions::Standard">Standard</a></div><div class="desc docblock-short">A generic random value distribution, implemented for many primitive types.
Usually generates values with a numerically uniform distribution, and with a
range appropriate to the type.</div></li><li><div class="item-name"><a class="struct" href="struct.Uniform.html" title="struct rand::distributions::Uniform">Uniform</a></div><div class="desc docblock-short">Sample values uniformly between two bounds.</div></li><li><div class="item-name"><a class="struct" href="struct.WeightedIndex.html" title="struct rand::distributions::WeightedIndex">Weighted<wbr>Index</a></div><div class="desc docblock-short">A distribution using weighted sampling of discrete items</div></li></ul><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.BernoulliError.html" title="enum rand::distributions::BernoulliError">Bernoulli<wbr>Error</a></div><div class="desc docblock-short">Error type returned from <code>Bernoulli::new</code>.</div></li><li><div class="item-name"><a class="enum" href="enum.WeightedError.html" title="enum rand::distributions::WeightedError">Weighted<wbr>Error</a></div><div class="desc docblock-short">Error type returned from <code>WeightedIndex::new</code>.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.DistString.html" title="trait rand::distributions::DistString">Dist<wbr>String</a></div><div class="desc docblock-short"><code>String</code> sampler</div></li><li><div class="item-name"><a class="trait" href="trait.Distribution.html" title="trait rand::distributions::Distribution">Distribution</a></div><div class="desc docblock-short">Types (distributions) that can be used to create a random instance of <code>T</code>.</div></li></ul></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="`String` sampler"><title>DistString in rand::distributions - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Dist<wbr>String</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.append_string" title="append_string">append_string</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.sample_string" title="sample_string">sample_string</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In rand::<wbr>distributions</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">rand</a>::<wbr><a href="index.html">distributions</a></span><h1>Trait <span class="trait">DistString</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/rand/distributions/distribution.rs.html#197-208">Source</a> </span></div><pre class="rust item-decl"><code>pub trait DistString {
// Required method
fn <a href="#tymethod.append_string" class="fn">append_string</a>&lt;R: <a class="trait" href="../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(
&amp;self,
rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>,
string: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.84.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>,
len: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>,
);
// Provided method
fn <a href="#method.sample_string" class="fn">sample_string</a>&lt;R: <a class="trait" href="../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(&amp;self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>, len: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.84.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>String</code> sampler</p>
<p>Sampling a <code>String</code> of random characters is not quite the same as collecting
a sequence of chars. This trait contains some helpers.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.append_string" class="method"><a class="src rightside" href="../../src/rand/distributions/distribution.rs.html#199">Source</a><h4 class="code-header">fn <a href="#tymethod.append_string" class="fn">append_string</a>&lt;R: <a class="trait" href="../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(
&amp;self,
rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>,
string: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.84.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>,
len: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>,
)</h4></section></summary><div class="docblock"><p>Append <code>len</code> random chars to <code>string</code></p>
</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.sample_string" class="method"><a class="src rightside" href="../../src/rand/distributions/distribution.rs.html#203-207">Source</a><h4 class="code-header">fn <a href="#method.sample_string" class="fn">sample_string</a>&lt;R: <a class="trait" href="../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(&amp;self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>, len: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.84.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class="docblock"><p>Generate a <code>String</code> of <code>len</code> random chars</p>
</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.84.1/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-DistString-for-Alphanumeric" class="impl"><a class="src rightside" href="../../src/rand/distributions/other.rs.html#128-135">Source</a><a href="#impl-DistString-for-Alphanumeric" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.DistString.html" title="trait rand::distributions::DistString">DistString</a> for <a class="struct" href="struct.Alphanumeric.html" title="struct rand::distributions::Alphanumeric">Alphanumeric</a></h3></section><section id="impl-DistString-for-Standard" class="impl"><a class="src rightside" href="../../src/rand/distributions/other.rs.html#98-106">Source</a><a href="#impl-DistString-for-Standard" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.DistString.html" title="trait rand::distributions::DistString">DistString</a> for <a class="struct" href="struct.Standard.html" title="struct rand::distributions::Standard">Standard</a></h3></section><div class="docblock"><p>Note: the <code>String</code> is potentially left with excess capacity; optionally the
user may call <code>string.shrink_to_fit()</code> afterwards.</p>
</div></div><script src="../../trait.impl/rand/distributions/distribution/trait.DistString.js" async></script></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A distribution uniformly sampling numbers within a given range."><title>rand::distributions::uniform - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module uniform</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example-usage" title="Example usage">Example usage</a></li><li><a href="#extending-uniform-to-support-a-custom-type" title="Extending `Uniform` to support a custom type">Extending <code>Uniform</code> to support a custom type</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In rand::<wbr>distributions</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">distributions</a></span><h1>Module <span>uniform</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/distributions/uniform.rs.html#10-1658">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A distribution uniformly sampling numbers within a given range.</p>
<p><a href="../struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a> is the standard distribution to sample uniformly from a range;
e.g. <code>Uniform::new_inclusive(1, 6)</code> can sample integers from 1 to 6, like a
standard die. <a href="../../trait.Rng.html#method.gen_range" title="method rand::Rng::gen_range"><code>Rng::gen_range</code></a> supports any type supported by
<a href="../struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a>.</p>
<p>This distribution is provided with support for several primitive types
(all integer and floating-point types) as well as <a href="https://doc.rust-lang.org/1.84.1/core/time/struct.Duration.html" title="struct core::time::Duration"><code>std::time::Duration</code></a>,
and supports extension to user-defined types via a type-specific <em>back-end</em>
implementation.</p>
<p>The types <a href="struct.UniformInt.html" title="struct rand::distributions::uniform::UniformInt"><code>UniformInt</code></a>, <a href="struct.UniformFloat.html" title="struct rand::distributions::uniform::UniformFloat"><code>UniformFloat</code></a> and <a href="struct.UniformDuration.html" title="struct rand::distributions::uniform::UniformDuration"><code>UniformDuration</code></a> are the
back-ends supporting sampling from primitive integer and floating-point
ranges as well as from <a href="https://doc.rust-lang.org/1.84.1/core/time/struct.Duration.html" title="struct core::time::Duration"><code>std::time::Duration</code></a>; these types do not normally
need to be used directly (unless implementing a derived back-end).</p>
<h2 id="example-usage"><a class="doc-anchor" href="#example-usage">§</a>Example usage</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>rand::{Rng, thread_rng};
<span class="kw">use </span>rand::distributions::Uniform;
<span class="kw">let </span><span class="kw-2">mut </span>rng = thread_rng();
<span class="kw">let </span>side = Uniform::new(-<span class="number">10.0</span>, <span class="number">10.0</span>);
<span class="comment">// sample between 1 and 10 points
</span><span class="kw">for _ in </span><span class="number">0</span>..rng.gen_range(<span class="number">1</span>..=<span class="number">10</span>) {
<span class="comment">// sample a point from the square with sides -10 - 10 in two dimensions
</span><span class="kw">let </span>(x, y) = (rng.sample(side), rng.sample(side));
<span class="macro">println!</span>(<span class="string">"Point: {}, {}"</span>, x, y);
}</code></pre></div>
<h2 id="extending-uniform-to-support-a-custom-type"><a class="doc-anchor" href="#extending-uniform-to-support-a-custom-type">§</a>Extending <code>Uniform</code> to support a custom type</h2>
<p>To extend <a href="../struct.Uniform.html" title="struct rand::distributions::Uniform"><code>Uniform</code></a> to support your own types, write a back-end which
implements the <a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> trait, then implement the <a href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform"><code>SampleUniform</code></a>
helper trait to “register” your back-end. See the <code>MyF32</code> example below.</p>
<p>At a minimum, the back-end needs to store any parameters needed for sampling
(e.g. the target range) and implement <code>new</code>, <code>new_inclusive</code> and <code>sample</code>.
Those methods should include an assert to check the range is valid (i.e.
<code>low &lt; high</code>). The example below merely wraps another back-end.</p>
<p>The <code>new</code>, <code>new_inclusive</code> and <code>sample_single</code> functions use arguments of
type SampleBorrow<X> in order to support passing in values by reference or
by value. In the implementation of these functions, you can choose to
simply use the reference returned by <a href="trait.SampleBorrow.html#tymethod.borrow" title="method rand::distributions::uniform::SampleBorrow::borrow"><code>SampleBorrow::borrow</code></a>, or you can choose
to copy or clone the value, whatever is appropriate for your type.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>rand::prelude::<span class="kw-2">*</span>;
<span class="kw">use </span>rand::distributions::uniform::{Uniform, SampleUniform,
UniformSampler, UniformFloat, SampleBorrow};
<span class="kw">struct </span>MyF32(f32);
<span class="attr">#[derive(Clone, Copy, Debug)]
</span><span class="kw">struct </span>UniformMyF32(UniformFloat&lt;f32&gt;);
<span class="kw">impl </span>UniformSampler <span class="kw">for </span>UniformMyF32 {
<span class="kw">type </span>X = MyF32;
<span class="kw">fn </span>new&lt;B1, B2&gt;(low: B1, high: B2) -&gt; <span class="self">Self
</span><span class="kw">where </span>B1: SampleBorrow&lt;<span class="self">Self</span>::X&gt; + Sized,
B2: SampleBorrow&lt;<span class="self">Self</span>::X&gt; + Sized
{
UniformMyF32(UniformFloat::&lt;f32&gt;::new(low.borrow().<span class="number">0</span>, high.borrow().<span class="number">0</span>))
}
<span class="kw">fn </span>new_inclusive&lt;B1, B2&gt;(low: B1, high: B2) -&gt; <span class="self">Self
</span><span class="kw">where </span>B1: SampleBorrow&lt;<span class="self">Self</span>::X&gt; + Sized,
B2: SampleBorrow&lt;<span class="self">Self</span>::X&gt; + Sized
{
UniformMyF32(UniformFloat::&lt;f32&gt;::new_inclusive(
low.borrow().<span class="number">0</span>,
high.borrow().<span class="number">0</span>,
))
}
<span class="kw">fn </span>sample&lt;R: Rng + <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, rng: <span class="kw-2">&amp;mut </span>R) -&gt; <span class="self">Self</span>::X {
MyF32(<span class="self">self</span>.<span class="number">0</span>.sample(rng))
}
}
<span class="kw">impl </span>SampleUniform <span class="kw">for </span>MyF32 {
<span class="kw">type </span>Sampler = UniformMyF32;
}
<span class="kw">let </span>(low, high) = (MyF32(<span class="number">17.0f32</span>), MyF32(<span class="number">22.0f32</span>));
<span class="kw">let </span>uniform = Uniform::new(low, high);
<span class="kw">let </span>x = uniform.sample(<span class="kw-2">&amp;mut </span>thread_rng());</code></pre></div>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Uniform.html" title="struct rand::distributions::uniform::Uniform">Uniform</a></div><div class="desc docblock-short">Sample values uniformly between two bounds.</div></li><li><div class="item-name"><a class="struct" href="struct.UniformChar.html" title="struct rand::distributions::uniform::UniformChar">Uniform<wbr>Char</a></div><div class="desc docblock-short">The back-end implementing <a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> for <code>char</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.UniformDuration.html" title="struct rand::distributions::uniform::UniformDuration">Uniform<wbr>Duration</a></div><div class="desc docblock-short">The back-end implementing <a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> for <code>Duration</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.UniformFloat.html" title="struct rand::distributions::uniform::UniformFloat">Uniform<wbr>Float</a></div><div class="desc docblock-short">The back-end implementing <a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> for floating-point types.</div></li><li><div class="item-name"><a class="struct" href="struct.UniformInt.html" title="struct rand::distributions::uniform::UniformInt">Uniform<wbr>Int</a></div><div class="desc docblock-short">The back-end implementing <a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> for integer types.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.SampleBorrow.html" title="trait rand::distributions::uniform::SampleBorrow">Sample<wbr>Borrow</a></div><div class="desc docblock-short">Helper trait similar to <a href="https://doc.rust-lang.org/1.84.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow"><code>Borrow</code></a> but implemented
only for SampleUniform and references to SampleUniform in
order to resolve ambiguity issues.</div></li><li><div class="item-name"><a class="trait" href="trait.SampleRange.html" title="trait rand::distributions::uniform::SampleRange">Sample<wbr>Range</a></div><div class="desc docblock-short">Range that supports generating a single sample efficiently.</div></li><li><div class="item-name"><a class="trait" href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform">Sample<wbr>Uniform</a></div><div class="desc docblock-short">Helper trait for creating objects using the correct implementation of
<a href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler"><code>UniformSampler</code></a> for the sampling type.</div></li><li><div class="item-name"><a class="trait" href="trait.UniformSampler.html" title="trait rand::distributions::uniform::UniformSampler">Uniform<wbr>Sampler</a></div><div class="desc docblock-short">Helper trait handling actual uniform sampling.</div></li></ul></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Helper trait similar to `Borrow` but implemented only for SampleUniform and references to SampleUniform in order to resolve ambiguity issues."><title>SampleBorrow in rand::distributions::uniform - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Sample<wbr>Borrow</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.borrow" title="borrow">borrow</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-SampleBorrow%3CBorrowed%3E-for-%26Borrowed" title="&#38;&#39;a Borrowed">&#38;&#39;a Borrowed</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In rand::<wbr>distributions::<wbr>uniform</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">distributions</a>::<wbr><a href="index.html">uniform</a></span><h1>Trait <span class="trait">SampleBorrow</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/distributions/uniform.rs.html#322-327">Source</a> </span></div><pre class="rust item-decl"><code>pub trait SampleBorrow&lt;Borrowed&gt; {
// Required method
fn <a href="#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;Borrowed</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Helper trait similar to <a href="https://doc.rust-lang.org/1.84.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow"><code>Borrow</code></a> but implemented
only for SampleUniform and references to SampleUniform in
order to resolve ambiguity issues.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.borrow" class="method"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#326">Source</a><h4 class="code-header">fn <a href="#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;Borrowed</a></h4></section></summary><div class="docblock"><p>Immutably borrows from an owned value. See <a href="https://doc.rust-lang.org/1.84.1/core/borrow/trait.Borrow.html#tymethod.borrow" title="method core::borrow::Borrow::borrow"><code>Borrow::borrow</code></a></p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-SampleBorrow%3CBorrowed%3E-for-%26Borrowed" class="impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#336-343">Source</a><a href="#impl-SampleBorrow%3CBorrowed%3E-for-%26Borrowed" class="anchor">§</a><h3 class="code-header">impl&lt;'a, Borrowed&gt; <a class="trait" href="trait.SampleBorrow.html" title="trait rand::distributions::uniform::SampleBorrow">SampleBorrow</a>&lt;Borrowed&gt; for <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;'a Borrowed</a><div class="where">where
Borrowed: <a class="trait" href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform">SampleUniform</a>,</div></h3></section></summary><div class="impl-items"><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#340-342">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;Borrowed</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-SampleBorrow%3CBorrowed%3E-for-Borrowed" class="impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#328-335">Source</a><a href="#impl-SampleBorrow%3CBorrowed%3E-for-Borrowed" class="anchor">§</a><h3 class="code-header">impl&lt;Borrowed&gt; <a class="trait" href="trait.SampleBorrow.html" title="trait rand::distributions::uniform::SampleBorrow">SampleBorrow</a>&lt;Borrowed&gt; for Borrowed<div class="where">where
Borrowed: <a class="trait" href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform">SampleUniform</a>,</div></h3></section></div><script src="../../../trait.impl/rand/distributions/uniform/trait.SampleBorrow.js" async></script></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Range that supports generating a single sample efficiently."><title>SampleRange in rand::distributions::uniform - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Sample<wbr>Range</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.is_empty" title="is_empty">is_empty</a></li><li><a href="#tymethod.sample_single" title="sample_single">sample_single</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-SampleRange%3CT%3E-for-Range%3CT%3E" title="Range&#60;T&#62;">Range&#60;T&#62;</a></li><li><a href="#impl-SampleRange%3CT%3E-for-RangeInclusive%3CT%3E" title="RangeInclusive&#60;T&#62;">RangeInclusive&#60;T&#62;</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In rand::<wbr>distributions::<wbr>uniform</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">distributions</a>::<wbr><a href="index.html">uniform</a></span><h1>Trait <span class="trait">SampleRange</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/distributions/uniform.rs.html#349-355">Source</a> </span></div><pre class="rust item-decl"><code>pub trait SampleRange&lt;T&gt; {
// Required methods
fn <a href="#tymethod.sample_single" class="fn">sample_single</a>&lt;R: <a class="trait" href="../../trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>) -&gt; T;
<span class="item-spacer"></span> fn <a href="#tymethod.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Range that supports generating a single sample efficiently.</p>
<p>Any type implementing this trait can be used to specify the sampled range
for <code>Rng::gen_range</code>.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.sample_single" class="method"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#351">Source</a><h4 class="code-header">fn <a href="#tymethod.sample_single" class="fn">sample_single</a>&lt;R: <a class="trait" href="../../trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>) -&gt; T</h4></section></summary><div class="docblock"><p>Generate a sample from the given range.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.is_empty" class="method"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#354">Source</a><h4 class="code-header">fn <a href="#tymethod.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Check whether the range is empty.</p>
</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.84.1/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-SampleRange%3CT%3E-for-Range%3CT%3E" class="impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#357-367">Source</a><a href="#impl-SampleRange%3CT%3E-for-Range%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform">SampleUniform</a> + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>&gt; <a class="trait" href="trait.SampleRange.html" title="trait rand::distributions::uniform::SampleRange">SampleRange</a>&lt;T&gt; for <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/ops/range/struct.Range.html" title="struct core::ops::range::Range">Range</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.sample_single" class="method trait-impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#359-361">Source</a><a href="#method.sample_single" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.sample_single" class="fn">sample_single</a>&lt;R: <a class="trait" href="../../trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>) -&gt; T</h4></section><section id="method.is_empty" class="method trait-impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#364-366">Source</a><a href="#method.is_empty" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-SampleRange%3CT%3E-for-RangeInclusive%3CT%3E" class="impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#369-379">Source</a><a href="#impl-SampleRange%3CT%3E-for-RangeInclusive%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="trait.SampleUniform.html" title="trait rand::distributions::uniform::SampleUniform">SampleUniform</a> + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>&gt; <a class="trait" href="trait.SampleRange.html" title="trait rand::distributions::uniform::SampleRange">SampleRange</a>&lt;T&gt; for <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/ops/range/struct.RangeInclusive.html" title="struct core::ops::range::RangeInclusive">RangeInclusive</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.sample_single-1" class="method trait-impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#371-373">Source</a><a href="#method.sample_single-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.sample_single" class="fn">sample_single</a>&lt;R: <a class="trait" href="../../trait.RngCore.html" title="trait rand::RngCore">RngCore</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(self, rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>) -&gt; T</h4></section><section id="method.is_empty-1" class="method trait-impl"><a class="src rightside" href="../../../src/rand/distributions/uniform.rs.html#376-378">Source</a><a href="#method.is_empty-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../../../trait.impl/rand/distributions/uniform/trait.SampleRange.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `alias_method` mod in crate `rand`."><title>rand::distributions::weighted::alias_method - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module alias_<wbr>method</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In rand::<wbr>distributions::<wbr>weighted</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../../index.html">rand</a>::<wbr><a href="../../index.html">distributions</a>::<wbr><a href="../index.html">weighted</a></span><h1>Module <span>alias_method</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../../src/rand/distributions/weighted.rs.html#18">Source</a> </span></div><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.8.0: moved to rand_distr crate</span></div></span><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.WeightedIndex.html" title="struct rand::distributions::weighted::alias_method::WeightedIndex">Weighted<wbr>Index</a><wbr><span class="stab deprecated" title="">Deprecated</span></div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.Weight.html" title="trait rand::distributions::weighted::alias_method::Weight">Weight</a><wbr><span class="stab deprecated" title="">Deprecated</span></div></li></ul></section></div></main></body></html>

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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Weighted index sampling"><title>rand::distributions::weighted - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module weighted</a></h2><h3><a href="#reexports">Module Items</a></h3><ul class="block"><li><a href="#reexports" title="Re-exports">Re-exports</a></li><li><a href="#modules" title="Modules">Modules</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In rand::<wbr>distributions</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">distributions</a></span><h1>Module <span>weighted</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/distributions/weighted.rs.html#9-47">Source</a> </span></div><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.8.0: use rand::distributions::{WeightedIndex, WeightedError} instead</span></div></span><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Weighted index sampling</p>
<p>This module is deprecated. Use <a href="../struct.WeightedIndex.html" title="struct rand::distributions::WeightedIndex"><code>crate::distributions::WeightedIndex</code></a> and
<a href="../enum.WeightedError.html" title="enum rand::distributions::WeightedError"><code>crate::distributions::WeightedError</code></a> instead.</p>
</div></details><h2 id="reexports" class="section-header">Re-exports<a href="#reexports" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name" id="reexport.WeightedIndex"><code>pub use super::<a class="struct" href="../struct.WeightedIndex.html" title="struct rand::distributions::WeightedIndex">WeightedIndex</a>;</code></div></li><li><div class="item-name" id="reexport.WeightedError"><code>pub use super::<a class="enum" href="../enum.WeightedError.html" title="enum rand::distributions::WeightedError">WeightedError</a>;</code></div></li></ul><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="alias_method/index.html" title="mod rand::distributions::weighted::alias_method">alias_<wbr>method</a><wbr><span class="stab deprecated" title="">Deprecated</span></div></li></ul></section></div></main></body></html>

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