| <!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="An iterator source that produces elements indefinitely by calling a given closure."><meta name="keywords" content="rust, rustlang, rust-lang, repeat_call"><title>repeat_call in itertools - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../normalize.css"><link rel="stylesheet" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../ayu.css" disabled><link rel="stylesheet" href="../dark.css" disabled><link rel="stylesheet" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"></head><body class="rustdoc fn"><!--[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">☰</button><a class="sidebar-logo" href="../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In itertools</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Function <a href="index.html">itertools</a>::<wbr><a class="fn" href="#">repeat_call</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../src/itertools/sources.rs.html#43-47">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust fn"><code>pub fn repeat_call<F, A>(function: F) -> <a class="struct" href="structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F></span><code class="content"><span class="where fmt-newline">impl<A, F> Iterator for <a class="struct" href="structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F><span class="where fmt-newline">where<br> F: FnMut() -> A,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = A;</span></code></span></span></span></span><span class="where fmt-newline">where<br> F: FnMut() -> A,</span></code></pre></div><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.8.0: Use std repeat_with() instead</span></div></span><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>An iterator source that produces elements indefinitely by calling |
| a given closure.</p> |
| <p>Iterator element type is the return type of the closure.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>itertools::repeat_call; |
| <span class="kw">use </span>itertools::Itertools; |
| <span class="kw">use </span>std::collections::BinaryHeap; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>heap = BinaryHeap::from(<span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">5</span>, <span class="number">3</span>, <span class="number">7</span>, <span class="number">8</span>]); |
| |
| <span class="comment">// extract each element in sorted order |
| </span><span class="kw">for </span>element <span class="kw">in </span>repeat_call(|| heap.pop()).while_some() { |
| <span class="macro">print!</span>(<span class="string">"{}"</span>, element); |
| } |
| |
| itertools::assert_equal( |
| repeat_call(|| <span class="number">1</span>).take(<span class="number">5</span>), |
| <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>] |
| );</code></pre></div> |
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