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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 `repeat` fn in crate `nom`."><meta name="keywords" content="rust, rustlang, rust-lang, repeat"><title>nom::lib::std::iter::repeat - Rust</title><link rel="stylesheet" type="text/css" href="../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../light.css" id="themeStyle"><script src="../../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../../../nom/index.html'><div class='logo-container'><img src='../../../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='../../../index.html'>nom</a>::<wbr><a href='../../index.html'>lib</a>::<wbr><a href='../index.html'>std</a>::<wbr><a href='index.html'>iter</a></p><script>window.sidebarCurrent = {name: 'repeat', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"></div><a id="settings-menu" href="../../../../settings.html"><img src="../../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/iter/sources.rs.html#99-101' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../../../index.html'>nom</a>::<wbr><a href='../../index.html'>lib</a>::<wbr><a href='../index.html'>std</a>::<wbr><a href='index.html'>iter</a>::<wbr><a class="fn" href=''>repeat</a></span></h1><pre class='rust fn'>pub fn repeat&lt;T&gt;(elt: T) -&gt; <a class="struct" href="../../../../nom/lib/std/iter/struct.Repeat.html" title="struct nom::lib::std::iter::Repeat">Repeat</a>&lt;T&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="../../../../nom/lib/std/prelude/v1/v1/trait.Clone.html" title="trait nom::lib::std::prelude::v1::v1::Clone">Clone</a>,&nbsp;</span></pre><div class='docblock'><p>Creates a new iterator that endlessly repeats a single element.</p>
<p>The <code>repeat()</code> function repeats a single value over and over again.</p>
<p>Infinite iterators like <code>repeat()</code> are often used with adapters like
<a href="trait.Iterator.html#method.take"><code>take</code></a>, in order to make them finite.</p>
<p>If the element type of the iterator you need does not implement <code>Clone</code>,
or if you do not want to keep the repeated element in memory, you can
instead use the <a href="fn.repeat_with.html"><code>repeat_with</code></a> function.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>;
<span class="comment">// the number four 4ever:</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fours</span> <span class="op">=</span> <span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="number">4</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());
<span class="comment">// yup, still four</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">fours</span>.<span class="ident">next</span>());</pre></div>
<p>Going finite with <a href="trait.Iterator.html#method.take"><code>take</code></a>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>;
<span class="comment">// that last example was too many fours. Let&#39;s only have four fours.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">four_fours</span> <span class="op">=</span> <span class="ident">iter</span>::<span class="ident">repeat</span>(<span class="number">4</span>).<span class="ident">take</span>(<span class="number">4</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">four_fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">four_fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">four_fours</span>.<span class="ident">next</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="number">4</span>), <span class="ident">four_fours</span>.<span class="ident">next</span>());
<span class="comment">// ... and now we&#39;re done</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">four_fours</span>.<span class="ident">next</span>());</pre></div>
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