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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="“Lift” a function of the values of an iterator so that it can process an iterator of `Result` values instead."><title>process_results in itertools - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="itertools" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.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></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../itertools/index.html">itertools</a><span class="version">0.10.5</span></h2></div><div class="sidebar-elems"></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../itertools/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Function <a href="index.html">itertools</a>::<wbr><a class="fn" href="#">process_results</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/itertools/process_results_impl.rs.html#87-97">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub fn process_results<I, F, T, E, R>(iterable: I, processor: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><R, E><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E>>,
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="struct" href="structs/struct.ProcessResults.html" title="struct itertools::structs::ProcessResults">ProcessResults</a><'_, I::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::collect::IntoIterator::IntoIter">IntoIter</a>, E>) -> R,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>“Lift” a function of the values of an iterator so that it can process
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an iterator of <code>Result</code> values instead.</p>
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<p><code>iterable</code> is an iterator or iterable with <code>Result<T, E></code> elements, where
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<code>T</code> is the value type and <code>E</code> the error type.</p>
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<p><code>processor</code> is a closure that receives an adapted version of the iterable
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as the only argument — the adapted iterator produces elements of type <code>T</code>,
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as long as the original iterator produces <code>Ok</code> values.</p>
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<p>If the original iterable produces an error at any point, the adapted
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iterator ends and the <code>process_results</code> function will return the
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error iself.</p>
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<p>Otherwise, the return value from the closure is returned wrapped
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inside <code>Ok</code>.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>itertools::process_results;
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<span class="kw">type </span>R = <span class="prelude-ty">Result</span><i32, <span class="kw-2">&</span><span class="lifetime">'static </span>str>;
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<span class="kw">let </span>first_values: Vec<R> = <span class="macro">vec!</span>[<span class="prelude-val">Ok</span>(<span class="number">1</span>), <span class="prelude-val">Ok</span>(<span class="number">0</span>), <span class="prelude-val">Ok</span>(<span class="number">3</span>)];
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<span class="kw">let </span>second_values: Vec<R> = <span class="macro">vec!</span>[<span class="prelude-val">Ok</span>(<span class="number">2</span>), <span class="prelude-val">Ok</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="string">"overflow"</span>)];
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<span class="comment">// “Lift” the iterator .max() method to work on the values in Results using process_results
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</span><span class="kw">let </span>first_max = process_results(first_values, |iter| iter.max().unwrap_or(<span class="number">0</span>));
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<span class="kw">let </span>second_max = process_results(second_values, |iter| iter.max().unwrap_or(<span class="number">0</span>));
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<span class="macro">assert_eq!</span>(first_max, <span class="prelude-val">Ok</span>(<span class="number">3</span>));
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<span class="macro">assert!</span>(second_max.is_err());</code></pre></div>
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