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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 `ResultExt` trait in crate `failure`."><meta name="keywords" content="rust, rustlang, rust-lang, ResultExt"><title>failure::ResultExt - 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="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../failure/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Trait ResultExt</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.compat">compat</a><a href="#tymethod.context">context</a><a href="#tymethod.with_context">with_context</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-ResultExt%3CT%2C%20E%3E-for-Result%3CT%2C%20E%3E">Result<T, E></a><a href="#impl-ResultExt%3CT%2C%20Error%3E-for-Result%3CT%2C%20Error%3E">Result<T, Error></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>failure</a></p><script>window.sidebarCurrent = {name: 'ResultExt', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='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/failure/result_ext.rs.html#6-150' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>failure</a>::<wbr><a class="trait" href=''>ResultExt</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait ResultExt<T, E> {
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fn <a href='#tymethod.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>>;
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<div class='item-spacer'></div> fn <a href='#tymethod.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>><br> <span class="where">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static</span>;
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<div class='item-spacer'></div> fn <a href='#tymethod.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static</span>;
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}</pre></div><div class='docblock'><p>Extension methods for <code>Result</code>.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.compat' class='method'><code id='compat.v'>fn <a href='#tymethod.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>></code></h3><div class='docblock'><p>Wraps the error in <code>Compat</code> to make it compatible with older error
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handling APIs that expect <code>std::error::Error</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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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">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">CustomError</span> {
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<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">str</span> {
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<span class="string">"My custom error message"</span>
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}
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<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">None</span>
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}
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}
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">|</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>).<span class="ident">compat</span>()<span class="question-mark">?</span>
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})().<span class="ident">with_context</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> {
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<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured: {}"</span>, <span class="ident">e</span>)
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}).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured: My custom error message"</span>);
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</pre></div>
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</div><h3 id='tymethod.context' class='method'><code id='context.v'>fn <a href='#tymethod.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></h3><div class='docblock'><p>Wraps the error type in a context type.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">Debug</span>)]</span>
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<span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">""</span>)]</span>
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">|</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>)<span class="question-mark">?</span>
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})().<span class="ident">context</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured"</span>)).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured"</span>);
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</pre></div>
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</div><h3 id='tymethod.with_context' class='method'><code id='with_context.v'>fn <a href='#tymethod.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code></h3><div class='docblock'><p>Wraps the error type in a context type generated by looking at the
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error value.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">Debug</span>)]</span>
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<span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">"My custom error message"</span>)]</span>
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<span class="kw">struct</span> <span class="ident">CustomError</span>;
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> (<span class="op">|</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">failure</span>::<span class="ident">Error</span><span class="op">></span> {
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<span class="prelude-val">Err</span>(<span class="ident">CustomError</span>)<span class="question-mark">?</span>
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})().<span class="ident">with_context</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> {
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<span class="macro">format</span><span class="macro">!</span>(<span class="string">"An error occured: {}"</span>, <span class="ident">e</span>)
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}).<span class="ident">unwrap_err</span>();
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<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">x</span>, <span class="string">"An error occured: My custom error message"</span>);
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</pre></div>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='foreign-impls' class='small-section-header'>Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a></h2><h3 id='impl-ResultExt%3CT%2C%20E%3E-for-Result%3CT%2C%20E%3E' class='impl'><code class='in-band'>impl<T, E> <a class="trait" href="../failure/trait.ResultExt.html" title="trait failure::ResultExt">ResultExt</a><T, E> for <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../failure/trait.Fail.html" title="trait failure::Fail">Fail</a>, </span></code><a href='#impl-ResultExt%3CT%2C%20E%3E-for-Result%3CT%2C%20E%3E' class='anchor'></a><a class='srclink' href='../src/failure/result_ext.rs.html#152-177' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.compat' class="method hidden"><code id='compat.v-1'>fn <a href='#method.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><E>></code><a class='srclink' href='../src/failure/result_ext.rs.html#156-158' title='goto source code'>[src]</a></h4><h4 id='method.context' class="method hidden"><code id='context.v-1'>fn <a href='#method.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/failure/result_ext.rs.html#160-165' title='goto source code'>[src]</a></h4><h4 id='method.with_context' class="method hidden"><code id='with_context.v-1'>fn <a href='#method.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/failure/result_ext.rs.html#167-176' title='goto source code'>[src]</a></h4></div><h3 id='impl-ResultExt%3CT%2C%20Error%3E-for-Result%3CT%2C%20Error%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="../failure/trait.ResultExt.html" title="trait failure::ResultExt">ResultExt</a><T, <a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>> for <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>></code><a href='#impl-ResultExt%3CT%2C%20Error%3E-for-Result%3CT%2C%20Error%3E' class='anchor'></a><a class='srclink' href='../src/failure/result_ext.rs.html#182-202' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.compat-1' class="method hidden"><code id='compat.v-2'>fn <a href='#method.compat' class='fnname'>compat</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Compat.html" title="struct failure::Compat">Compat</a><<a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>>></code><a class='srclink' href='../src/failure/result_ext.rs.html#183-185' title='goto source code'>[src]</a></h4><h4 id='method.context-1' class="method hidden"><code id='context.v-2'>fn <a href='#method.context' class='fnname'>context</a><D>(self, context: D) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/failure/result_ext.rs.html#187-191' title='goto source code'>[src]</a></h4><h4 id='method.with_context-1' class="method hidden"><code id='with_context.v-2'>fn <a href='#method.with_context' class='fnname'>with_context</a><F, D>(self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <a class="struct" href="../failure/struct.Context.html" title="struct failure::Context">Context</a><D>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&<a class="struct" href="../failure/struct.Error.html" title="struct failure::Error">Error</a>) -> D,<br> D: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/failure/result_ext.rs.html#193-201' title='goto source code'>[src]</a></h4></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'></div><span class='loading-content'>Loading content...</span><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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src="../implementors/failure/trait.ResultExt.js">
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