<!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 `Result` type in crate `core`."> <meta name="keywords" content="rust, rustlang, rust-lang, Result"> <title>core::fmt::Result - 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="../../main.css" id="themeStyle"> <script src="../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc type"> <!--[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='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> <p class='location'>Type Definition Result</p><div class="sidebar-elems"><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>fmt</a></p><script>window.sidebarCurrent = {name: 'Result', ty: 'type', 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"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"> <h1 class='fqn'><span class='in-band'>Type Definition <a href='../index.html'>core</a>::<wbr><a href='index.html'>fmt</a>::<wbr><a class="type" href=''>Result</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><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/core/fmt/mod.rs.html#77' title='goto source code'>[src]</a></span></h1> <pre class='rust typedef'>type Result = <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><(), <a class="struct" href="../../core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>>;</pre><div class='docblock'><p>The type returned by formatter methods.</p> <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1> <pre class="rust rust-example-rendered"> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>; <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> <span class="kw">struct</span> <span class="ident">Triangle</span> { <span class="ident">a</span>: <span class="ident">f32</span>, <span class="ident">b</span>: <span class="ident">f32</span>, <span class="ident">c</span>: <span class="ident">f32</span> } <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Triangle</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"({}, {}, {})"</span>, <span class="self">self</span>.<span class="ident">a</span>, <span class="self">self</span>.<span class="ident">b</span>, <span class="self">self</span>.<span class="ident">c</span>) } } <span class="kw">let</span> <span class="ident">pythagorean_triple</span> <span class="op">=</span> <span class="ident">Triangle</span> { <span class="ident">a</span>: <span class="number">3.0</span>, <span class="ident">b</span>: <span class="number">4.0</span>, <span class="ident">c</span>: <span class="number">5.0</span> }; <span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">pythagorean_triple</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Afmt%3B%0A%0A%23%5Bderive(Debug)%5D%0Astruct%20Triangle%20%7B%0A%20%20%20%20a%3A%20f32%2C%0A%20%20%20%20b%3A%20f32%2C%0A%20%20%20%20c%3A%20f32%0A%7D%0A%0Aimpl%20fmt%3A%3ADisplay%20for%20Triangle%20%7B%0A%20%20%20%20fn%20fmt(%26self%2C%20f%3A%20%26mut%20fmt%3A%3AFormatter)%20-%3E%20fmt%3A%3AResult%20%7B%0A%20%20%20%20%20%20%20%20write!(f%2C%20%22(%7B%7D%2C%20%7B%7D%2C%20%7B%7D)%22%2C%20self.a%2C%20self.b%2C%20self.c)%0A%20%20%20%20%7D%0A%7D%0A%0Alet%20pythagorean_triple%20%3D%20Triangle%20%7B%20a%3A%203.0%2C%20b%3A%204.0%2C%20c%3A%205.0%20%7D%3B%0A%0Aprintln!(%22%7B%7D%22%2C%20pythagorean_triple)%3B%0A%7D">Run</a></pre> </div></section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../"; 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