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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="Provides the `ok_or_eyre` method for `Option`."><title>OptionExt in eyre - 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="eyre" 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 trait"><!--[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="../eyre/index.html">eyre</a><span class="version">0.6.12</span></h2></div><h2 class="location"><a href="#">OptionExt</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.ok_or_eyre">ok_or_eyre</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-OptionExt%3CT%3E-for-Option%3CT%3E">Option<T></a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate eyre</a></h2></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="../eyre/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>Trait <a href="index.html">eyre</a>::<wbr><a class="trait" href="#">OptionExt</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/eyre/lib.rs.html#1168-1181">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait OptionExt<T>: Sealed {
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// Required method
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fn <a href="#tymethod.ok_or_eyre" class="fn">ok_or_eyre</a><M>(self, message: M) -> <a class="type" href="type.Result.html" title="type eyre::Result">Result</a><T>
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<span class="where">where M: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static</span>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Provides the <a href="trait.OptionExt.html#tymethod.ok_or_eyre" title="method eyre::OptionExt::ok_or_eyre"><code>ok_or_eyre</code></a> method for <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option"><code>Option</code></a>.</p>
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<p>This trait is sealed and cannot be implemented for types outside of
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<code>eyre</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>eyre::OptionExt;
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<span class="kw">let </span>option: <span class="prelude-ty">Option</span><()> = <span class="prelude-val">None</span>;
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<span class="kw">let </span>result = option.ok_or_eyre(<span class="string">"static str error"</span>);
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<span class="macro">assert_eq!</span>(result.unwrap_err().to_string(), <span class="string">"static str error"</span>);</code></pre></div>
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<h2 id="ok_or_eyre-vs-ok_or_else"><a href="#ok_or_eyre-vs-ok_or_else"><code>ok_or_eyre</code> vs <code>ok_or_else</code></a></h2>
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<p>If string interpolation is required for the generated <a href="struct.Report.html" title="struct eyre::Report">report</a>,
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use <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html#method.ok_or_else" title="method core::option::Option::ok_or_else"><code>ok_or_else</code></a> instead,
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invoking <a href="macro.format_err.html" title="macro eyre::format_err"><code>eyre!</code></a> to perform string interpolation:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>eyre::eyre;
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<span class="kw">let </span>option: <span class="prelude-ty">Option</span><()> = <span class="prelude-val">None</span>;
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<span class="kw">let </span>result = option.ok_or_else(|| <span class="macro">eyre!</span>(<span class="string">"{} error"</span>, <span class="string">"dynamic"</span>));
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<span class="macro">assert_eq!</span>(result.unwrap_err().to_string(), <span class="string">"dynamic error"</span>);</code></pre></div>
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<p><code>ok_or_eyre</code> incurs no runtime cost, as the error object
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is constructed from the provided static argument
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only in the <code>None</code> case.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.ok_or_eyre" class="method"><a class="src rightside" href="../src/eyre/lib.rs.html#1178-1180">source</a><h4 class="code-header">fn <a href="#tymethod.ok_or_eyre" class="fn">ok_or_eyre</a><M>(self, message: M) -> <a class="type" href="type.Result.html" title="type eyre::Result">Result</a><T><div class="where">where
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M: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></summary><div class="docblock"><p>Transform the <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option"><code>Option<T></code></a> into a <a href="type.Result.html" title="type eyre::Result"><code>Result<T, E></code></a>,
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mapping <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html#variant.Some" title="variant core::option::Option::Some"><code>Some(v)</code></a> to <a href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html#variant.Ok" title="variant core::result::Result::Ok"><code>Ok(v)</code></a>
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and <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html#variant.None" title="variant core::option::Option::None"><code>None</code></a> to <a href="struct.Report.html" title="struct eyre::Report"><code>Report</code></a>.</p>
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<p><code>ok_or_eyre</code> allows for eyre <a href="struct.Report.html" title="struct eyre::Report"><code>Report</code></a> error objects
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to be lazily created from static messages in the <code>None</code> case.</p>
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<p>For dynamic error messages, use <a href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html#method.ok_or_else" title="method core::option::Option::ok_or_else"><code>ok_or_else</code></a>,
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invoking <a href="macro.format_err.html" title="macro eyre::format_err"><code>eyre!</code></a> in the closure to perform string interpolation.</p>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-OptionExt%3CT%3E-for-Option%3CT%3E" class="impl"><a class="src rightside" href="../src/eyre/option.rs.html#4-15">source</a><a href="#impl-OptionExt%3CT%3E-for-Option%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.OptionExt.html" title="trait eyre::OptionExt">OptionExt</a><T> for <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h3></section></summary><div class="impl-items"><section id="method.ok_or_eyre" class="method trait-impl"><a class="src rightside" href="../src/eyre/option.rs.html#6-14">source</a><a href="#method.ok_or_eyre" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.ok_or_eyre" class="fn">ok_or_eyre</a><M>(self, message: M) -> <a class="type" href="type.Result.html" title="type eyre::Result">Result</a><T><div class="where">where
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M: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/eyre/trait.OptionExt.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html>
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