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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 `IOwrite` trait in crate `scroll`."><meta name="keywords" content="rust, rustlang, rust-lang, IOwrite"><title>scroll::IOwrite - 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='../scroll/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Trait IOwrite</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.iowrite">iowrite</a><a href="#method.iowrite_with">iowrite_with</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>scroll</a></p><script>window.sidebarCurrent = {name: 'IOwrite', 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/scroll/lesser.rs.html#114-166' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>scroll</a>::<wbr><a class="trait" href=''>IOwrite</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait IOwrite<Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>>: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> {
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fn <a href='#method.iowrite' class='fnname'>iowrite</a><N: <a class="trait" href="../scroll/ctx/trait.SizeWith.html" title="trait scroll::ctx::SizeWith">SizeWith</a><Ctx, Units = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> + <a class="trait" href="../scroll/ctx/trait.IntoCtx.html" title="trait scroll::ctx::IntoCtx">IntoCtx</a><Ctx>>(<br> &mut self, <br> n: N<br> ) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>><br> <span class="where">where<br> Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a></span>,
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{ ... }
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<div class='item-spacer'></div> fn <a href='#method.iowrite_with' class='fnname'>iowrite_with</a><N: <a class="trait" href="../scroll/ctx/trait.SizeWith.html" title="trait scroll::ctx::SizeWith">SizeWith</a><Ctx, Units = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> + <a class="trait" href="../scroll/ctx/trait.IntoCtx.html" title="trait scroll::ctx::IntoCtx">IntoCtx</a><Ctx>>(<br> &mut self, <br> n: N, <br> ctx: Ctx<br> ) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> { ... }
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}</pre></div><div class='docblock'><p>An extension trait to <code>std::io::Write</code> streams; this only serializes simple types, like <code>u8</code>, <code>i32</code>, <code>f32</code>, <code>usize</code>, etc.</p>
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<p>To write custom types with a single <code>iowrite::<YourType></code> call, implement <a href="trait.IntoCtx.html"><code>IntoCtx</code></a> and <a href="ctx/trait.SizeWith.html"><code>SizeWith</code></a> for <code>YourType</code>.</p>
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</div>
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<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.iowrite' class='method'><code id='iowrite.v'>fn <a href='#method.iowrite' class='fnname'>iowrite</a><N: <a class="trait" href="../scroll/ctx/trait.SizeWith.html" title="trait scroll::ctx::SizeWith">SizeWith</a><Ctx, Units = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> + <a class="trait" href="../scroll/ctx/trait.IntoCtx.html" title="trait scroll::ctx::IntoCtx">IntoCtx</a><Ctx>>(<br> &mut self, <br> n: N<br>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> <span class="where fmt-newline">where<br> Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></h3><div class='docblock'><p>Writes the type <code>N</code> into <code>Self</code>, with the parsing context <code>ctx</code>.
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<strong>NB</strong>: this will panic if the type you're writing has a size greater than 256. Plans are to have this allocate in larger cases.</p>
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<p>For the primitive numeric types, this will be at the host machine's endianness.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</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">scroll</span>::<span class="ident">IOwrite</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Cursor</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0x0u8</span>; <span class="number">4</span>];
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bytes</span>[..]);
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<span class="ident">bytes</span>.<span class="ident">iowrite</span>(<span class="number">0xdeadbeef</span> <span class="kw">as</span> <span class="ident">u32</span>).<span class="ident">unwrap</span>();
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_endian</span> <span class="op">=</span> <span class="string">"little"</span>)]</span>
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">bytes</span>.<span class="ident">into_inner</span>(), [<span class="number">0xef</span>, <span class="number">0xbe</span>, <span class="number">0xad</span>, <span class="number">0xde</span>,]);
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_endian</span> <span class="op">=</span> <span class="string">"big"</span>)]</span>
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">bytes</span>.<span class="ident">into_inner</span>(), [<span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>,]);</pre></div>
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</div><h3 id='method.iowrite_with' class='method'><code id='iowrite_with.v'>fn <a href='#method.iowrite_with' class='fnname'>iowrite_with</a><N: <a class="trait" href="../scroll/ctx/trait.SizeWith.html" title="trait scroll::ctx::SizeWith">SizeWith</a><Ctx, Units = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> + <a class="trait" href="../scroll/ctx/trait.IntoCtx.html" title="trait scroll::ctx::IntoCtx">IntoCtx</a><Ctx>>(<br> &mut self, <br> n: N, <br> ctx: Ctx<br>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>></code></h3><div class='docblock'><p>Writes the type <code>N</code> into <code>Self</code>, with the parsing context <code>ctx</code>.
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<strong>NB</strong>: this will panic if the type you're writing has a size greater than 256. Plans are to have this allocate in larger cases.</p>
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<p>For the primitive numeric types, this will be at the host machine's endianness.</p>
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<h1 id="example-1" class="section-header"><a href="#example-1">Example</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">scroll</span>::{<span class="ident">IOwrite</span>, <span class="ident">LE</span>, <span class="ident">BE</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="ident">Write</span>, <span class="ident">Cursor</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bytes</span> <span class="op">=</span> [<span class="number">0x0u8</span>; <span class="number">10</span>];
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cursor</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bytes</span>[..]);
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<span class="ident">cursor</span>.<span class="ident">write_all</span>(<span class="string">b"hello"</span>).<span class="ident">unwrap</span>();
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<span class="ident">cursor</span>.<span class="ident">iowrite_with</span>(<span class="number">0xdeadbeef</span> <span class="kw">as</span> <span class="ident">u32</span>, <span class="ident">BE</span>).<span class="ident">unwrap</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cursor</span>.<span class="ident">into_inner</span>(), [<span class="number">0x68</span>, <span class="number">0x65</span>, <span class="number">0x6c</span>, <span class="number">0x6c</span>, <span class="number">0x6f</span>, <span class="number">0xde</span>, <span class="number">0xad</span>, <span class="number">0xbe</span>, <span class="number">0xef</span>, <span class="number">0x0</span>]);</pre></div>
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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'><h3 id='impl-IOwrite%3CCtx%3E' class='impl'><code class='in-band'>impl<Ctx: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>, W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> IOwrite<Ctx> for W</code><a href='#impl-IOwrite%3CCtx%3E' class='anchor'></a><a class='srclink' href='../src/scroll/lesser.rs.html#170' title='goto source code'>[src]</a></h3><div class='docblock'><p>Types that implement <code>Write</code> get methods defined in <code>IOwrite</code>
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for free.</p>
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</div><div class='impl-items'></div></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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