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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 `FromHex` trait in crate `rustc_serialize`."><meta name="keywords" content="rust, rustlang, rust-lang, FromHex"><title>rustc_serialize::hex::FromHex - 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="https://www.rust-lang.org/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='../../rustc_serialize/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo'></div></a><p class='location'>Trait FromHex</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.from_hex">from_hex</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-FromHex-for-%26%27a%20T">&'a T</a><a href="#impl-FromHex-for-str">str</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>rustc_serialize</a>::<wbr><a href='index.html'>hex</a></p><script>window.sidebarCurrent = {name: 'FromHex', 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/rustc_serialize/hex.rs.html#63-67' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>rustc_serialize</a>::<wbr><a href='index.html'>hex</a>::<wbr><a class="trait" href=''>FromHex</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait FromHex {
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fn <a href='#tymethod.from_hex' class='fnname'>from_hex</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <a class="enum" href="../../rustc_serialize/hex/enum.FromHexError.html" title="enum rustc_serialize::hex::FromHexError">FromHexError</a>>;
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}</pre></div><div class='docblock'><p>A trait for converting hexadecimal encoded values</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.from_hex' class='method'><code id='from_hex.v'>fn <a href='#tymethod.from_hex' class='fnname'>from_hex</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <a class="enum" href="../../rustc_serialize/hex/enum.FromHexError.html" title="enum rustc_serialize::hex::FromHexError">FromHexError</a>></code></h3><div class='docblock'><p>Converts the value of <code>self</code>, interpreted as hexadecimal encoded data,
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into an owned vector of bytes, returning the vector.</p>
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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-FromHex-for-str' class='impl'><code class='in-band'>impl <a class="trait" href="../../rustc_serialize/hex/trait.FromHex.html" title="trait rustc_serialize::hex::FromHex">FromHex</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a href='#impl-FromHex-for-str' class='anchor'></a><a class='srclink' href='../../src/rustc_serialize/hex.rs.html#103-162' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from_hex' class="method"><code id='from_hex.v-1'>fn <a href='#method.from_hex' class='fnname'>from_hex</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <a class="enum" href="../../rustc_serialize/hex/enum.FromHexError.html" title="enum rustc_serialize::hex::FromHexError">FromHexError</a>></code><a class='srclink' href='../../src/rustc_serialize/hex.rs.html#127-161' title='goto source code'>[src]</a></h4><div class='docblock'><p>Convert any hexadecimal encoded string (literal, <code>@</code>, <code>&</code>, or <code>~</code>)
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to the byte values it encodes.</p>
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<p>You can use the <code>String::from_utf8</code> function to turn a
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<code>Vec<u8></code> into a string with characters corresponding to those values.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<p>This converts a string literal to hexadecimal and back.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">rustc_serialize</span>;
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<span class="kw">use</span> <span class="ident">rustc_serialize</span>::<span class="ident">hex</span>::{<span class="ident">FromHex</span>, <span class="ident">ToHex</span>};
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<span class="kw">fn</span> <span class="ident">main</span> () {
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<span class="kw">let</span> <span class="ident">hello_str</span> <span class="op">=</span> <span class="string">"Hello, World"</span>.<span class="ident">as_bytes</span>().<span class="ident">to_hex</span>();
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">hello_str</span>);
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<span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">hello_str</span>.<span class="ident">from_hex</span>().<span class="ident">unwrap</span>();
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">bytes</span>);
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<span class="kw">let</span> <span class="ident">result_str</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from_utf8</span>(<span class="ident">bytes</span>).<span class="ident">unwrap</span>();
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">result_str</span>);
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}</pre></div>
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</div></div><h3 id='impl-FromHex-for-%26%27a%20T' class='impl'><code class='in-band'>impl<'a, T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../rustc_serialize/hex/trait.FromHex.html" title="trait rustc_serialize::hex::FromHex">FromHex</a>> <a class="trait" href="../../rustc_serialize/hex/trait.FromHex.html" title="trait rustc_serialize::hex::FromHex">FromHex</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T</code><a href='#impl-FromHex-for-%26%27a%20T' class='anchor'></a><a class='srclink' href='../../src/rustc_serialize/hex.rs.html#164-168' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from_hex-1' class="method hidden"><code id='from_hex.v-2'>fn <a href='#method.from_hex' class='fnname'>from_hex</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>, <a class="enum" href="../../rustc_serialize/hex/enum.FromHexError.html" title="enum rustc_serialize::hex::FromHexError">FromHexError</a>></code><a class='srclink' href='../../src/rustc_serialize/hex.rs.html#165-167' 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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