<!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="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="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><script src="../crates.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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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">
<span class="kw">use</span> <span class="ident">itertools::repeat_call</span>;
<span class="kw">use</span> <span class="ident">itertools::Itertools</span>;
<span class="kw">use</span> <span class="ident">std::collections::BinaryHeap</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">BinaryHeap::from</span>(<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> <span class="ident">element</span> <span class="kw">in</span> <span class="ident">repeat_call</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">heap</span>.<span class="ident">pop</span>()).<span class="ident">while_some</span>() {
<span class="macro">print!</span>(<span class="string">"{}"</span>, <span class="ident">element</span>);
}
<span class="ident">itertools::assert_equal</span>(
<span class="ident">repeat_call</span>(<span class="op">|</span><span class="op">|</span> <span class="number">1</span>).<span class="ident">take</span>(<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>]
);</pre></div>
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