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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 `EncoderHelpers` trait in crate `rustc_serialize`."><meta name="keywords" content="rust, rustlang, rust-lang, EncoderHelpers"><title>rustc_serialize::EncoderHelpers - 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">&#9776;</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 EncoderHelpers</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.emit_from_vec">emit_from_vec</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>rustc_serialize</a></p><script>window.sidebarCurrent = {name: 'EncoderHelpers', 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'>&#x2212;</span>]</a></span><a class='srclink' href='../src/rustc_serialize/serialize.rs.html#1460-1493' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='index.html'>rustc_serialize</a>::<wbr><a class="trait" href=''>EncoderHelpers</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait EncoderHelpers: <a class="trait" href="../rustc_serialize/trait.Encoder.html" title="trait rustc_serialize::Encoder">Encoder</a> {
fn <a href='#tymethod.emit_from_vec' class='fnname'>emit_from_vec</a>&lt;T, F&gt;(&amp;mut self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[T]</a>, f: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt;</span>;
}</pre></div><div class='docblock'><p>Trait with helper functions for implementing <code>Encodable</code>.</p>
<p>This trait is implemented for everything that implements <code>Encoder</code>.
<code>Encodable</code> implementations can make use of it to make their implementations
easier.</p>
</div>
<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.emit_from_vec' class='method'><code id='emit_from_vec.v'>fn <a href='#tymethod.emit_from_vec' class='fnname'>emit_from_vec</a>&lt;T, F&gt;(&amp;mut self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[T]</a>, f: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>Self, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Self::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt;,&nbsp;</span></code></h3><div class='docblock'><p>Emit a vector as a sequence.</p>
<p>Storing sequences as vectors is a common pattern. This method makes
encoding such sequences easier by wrapping the calls to
<code>Encoder::emit_seq</code> and <code>Encoder::emit_seq_elt</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">rustc_serialize</span>::<span class="ident">Encodable</span>;
<span class="kw">use</span> <span class="ident">rustc_serialize</span>::<span class="ident">Encoder</span>;
<span class="kw">use</span> <span class="ident">rustc_serialize</span>::<span class="ident">EncoderHelpers</span>;
<span class="kw">struct</span> <span class="ident">NumberSequence</span> {
<span class="ident">elements</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>,
}
<span class="kw">impl</span> <span class="ident">Encodable</span> <span class="kw">for</span> <span class="ident">NumberSequence</span> {
<span class="kw">fn</span> <span class="ident">encode</span><span class="op">&lt;</span><span class="ident">S</span>: <span class="ident">Encoder</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">S</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">S</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
<span class="ident">s</span>.<span class="ident">emit_struct</span>(<span class="string">&quot;NumberSequence&quot;</span>, <span class="number">1</span>, <span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
<span class="ident">s</span>.<span class="ident">emit_struct_field</span>(<span class="string">&quot;elements&quot;</span>, <span class="number">0</span>, <span class="op">|</span><span class="ident">s</span><span class="op">|</span> {
<span class="ident">s</span>.<span class="ident">emit_from_vec</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">elements</span>, <span class="op">|</span><span class="ident">s</span>,<span class="ident">e</span><span class="op">|</span> {
<span class="ident">s</span>.<span class="ident">emit_i32</span>(<span class="kw-2">*</span><span class="ident">e</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-EncoderHelpers' class='impl'><code class='in-band'>impl&lt;S:&nbsp;<a class="trait" href="../rustc_serialize/trait.Encoder.html" title="trait rustc_serialize::Encoder">Encoder</a>&gt; EncoderHelpers for S</code><a href='#impl-EncoderHelpers' class='anchor'></a><a class='srclink' href='../src/rustc_serialize/serialize.rs.html#1495-1508' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.emit_from_vec' class="method hidden"><code id='emit_from_vec.v-1'>fn <a href='#method.emit_from_vec' class='fnname'>emit_from_vec</a>&lt;T, F&gt;(&amp;mut self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[T]</a>, f: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, S::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>S, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</a>T) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, S::<a class="type" href="../rustc_serialize/trait.Encoder.html#associatedtype.Error" title="type rustc_serialize::Encoder::Error">Error</a>&gt;,&nbsp;</span></code><a class='srclink' href='../src/rustc_serialize/serialize.rs.html#1496-1507' title='goto source code'>[src]</a></h4></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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