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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_call` fn in crate `itertools`."><meta name="keywords" content="rust, rustlang, rust-lang, repeat_call"><title>itertools::repeat_call - 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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<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="in-band">Function <a href="index.html">itertools</a>::<wbr><a class="fn" href="">repeat_call</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/itertools/sources.rs.html#43-47" title="goto source code">[src]</a></span></h1><pre class="rust fn">pub fn repeat_call<F, A>(function: F) -> <a class="struct" href="../itertools/structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="struct" href="../itertools/structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F></h3><code class="content"><span class="where fmt-newline">impl<A, F> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <a class="struct" href="../itertools/structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>() -> A, </span></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" class="type">Item</a> = A;</span></code></span></div></span></span> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>() -> A, </span></pre><div class="item-info"><div class="stab deprecated"><span class="emoji">👎</span> Deprecated since 0.8.0: <p>Use std repeat_with() instead</p>
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</div></div><div class="docblock"><p>An iterator source that produces elements indefinitely by calling
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a given closure.</p>
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<p>Iterator element type is the return type of the closure.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">repeat_call</span>;
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<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">Itertools</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BinaryHeap</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">BinaryHeap</span>::<span class="ident">from</span>(<span class="macro">vec</span><span class="macro">!</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>]);
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<span class="comment">// extract each element in sorted order</span>
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<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>() {
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<span class="macro">print</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">element</span>);
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}
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<span class="ident">itertools</span>::<span class="ident">assert_equal</span>(
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<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>),
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<span class="macro">vec</span><span class="macro">!</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>]
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);</pre></div>
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