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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="Returned from `Serializer::serialize_struct_variant`."><meta name="keywords" content="rust, rustlang, rust-lang, SerializeStructVariant"><title>SerializeStructVariant in serde::ser - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location">Trait SerializeStructVariant</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#associated-types">Associated Types</a></h3><div class="sidebar-links"><a href="#associatedtype.Error">Error</a><a href="#associatedtype.Ok">Ok</a></div><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><div class="sidebar-links"><a href="#tymethod.end">end</a><a href="#tymethod.serialize_field">serialize_field</a></div><h3 class="sidebar-title"><a href="#provided-methods">Provided Methods</a></h3><div class="sidebar-links"><a href="#method.skip_field">skip_field</a></div><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div><h2 class="location">Other items in<br><a href="../index.html">serde</a>::<wbr><a href="index.html">ser</a></h2><div id="sidebar-vars" data-name="SerializeStructVariant" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../serde/index.html"><img class="rust-logo" src="../../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><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><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">serde</a>::<wbr><a href="index.html">ser</a>::<wbr><a class="trait" href="#">SerializeStructVariant</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><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/serde/ser/mod.rs.html#1951-1976" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust trait"><code>pub trait SerializeStructVariant {
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type <a href="#associatedtype.Ok" class="associatedtype">Ok</a>;
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type <a href="#associatedtype.Error" class="associatedtype">Error</a>: <a class="trait" href="trait.Error.html" title="trait serde::ser::Error">Error</a>;
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fn <a href="#tymethod.serialize_field" class="fnname">serialize_field</a><T: ?<a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(<br> &mut self, <br> key: &'static <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, <br> value: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T<br> ) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>><br> <span class="where">where<br> T: <a class="trait" href="../trait.Serialize.html" title="trait serde::Serialize">Serialize</a></span>;
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<div class="item-spacer"></div> fn <a href="#tymethod.end" class="fnname">end</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Ok" title="type serde::ser::SerializeStructVariant::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>>;
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fn <a href="#method.skip_field" class="fnname">skip_field</a>(&mut self, key: &'static <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>> { ... }
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}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returned from <code>Serializer::serialize_struct_variant</code>.</p>
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<h2 id="example-use" class="section-header"><a href="#example-use">Example use</a></h2>
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<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition"><code><span class="kw">use</span> <span class="ident">serde::ser</span>::{<span class="ident">Serialize</span>, <span class="ident">SerializeStructVariant</span>, <span class="ident">Serializer</span>};
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<span class="kw">enum</span> <span class="ident">E</span> {
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<span class="ident">S</span> { <span class="ident">r</span>: <span class="ident">u8</span>, <span class="ident">g</span>: <span class="ident">u8</span>, <span class="ident">b</span>: <span class="ident">u8</span> },
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}
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<span class="kw">impl</span> <span class="ident">Serialize</span> <span class="kw">for</span> <span class="ident">E</span> {
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<span class="kw">fn</span> <span class="ident">serialize</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">serializer</span>: <span class="ident">S</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">S::Ok</span>, <span class="ident">S::Error</span><span class="op">></span>
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<span class="kw">where</span>
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<span class="ident">S</span>: <span class="ident">Serializer</span>,
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{
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<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
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<span class="ident">E::S</span> {
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<span class="kw-2">ref</span> <span class="ident">r</span>,
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<span class="kw-2">ref</span> <span class="ident">g</span>,
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<span class="kw-2">ref</span> <span class="ident">b</span>,
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} => {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sv</span> <span class="op">=</span> <span class="ident">serializer</span>.<span class="ident">serialize_struct_variant</span>(<span class="string">"E"</span>, <span class="number">0</span>, <span class="string">"S"</span>, <span class="number">3</span>)<span class="question-mark">?</span>;
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<span class="ident">sv</span>.<span class="ident">serialize_field</span>(<span class="string">"r"</span>, <span class="ident">r</span>)<span class="question-mark">?</span>;
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<span class="ident">sv</span>.<span class="ident">serialize_field</span>(<span class="string">"g"</span>, <span class="ident">g</span>)<span class="question-mark">?</span>;
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<span class="ident">sv</span>.<span class="ident">serialize_field</span>(<span class="string">"b"</span>, <span class="ident">b</span>)<span class="question-mark">?</span>;
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<span class="ident">sv</span>.<span class="ident">end</span>()
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}
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}
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}
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}</code></pre></div>
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<h2 id="example-implementation" class="section-header"><a href="#example-implementation">Example implementation</a></h2>
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<p>The <a href="https://serde.rs/data-format.html">example data format</a> presented on the website demonstrates an
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implementation of <code>SerializeStructVariant</code> for a basic JSON data format.</p>
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</div></details><h2 id="associated-types" class="small-section-header">Associated Types<a href="#associated-types" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Ok" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/mod.rs.html#1953" title="goto source code">[src]</a></div><h4 class="code-header">type <a href="#associatedtype.Ok" class="associatedtype">Ok</a></h4></div></summary><div class="docblock"><p>Must match the <code>Ok</code> type of our <code>Serializer</code>.</p>
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</div></details><details class="rustdoc-toggle" open><summary><div id="associatedtype.Error" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/mod.rs.html#1956" title="goto source code">[src]</a></div><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a>: <a class="trait" href="trait.Error.html" title="trait serde::ser::Error">Error</a></h4></div></summary><div class="docblock"><p>Must match the <code>Error</code> type of our <code>Serializer</code>.</p>
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</div></details></div><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="tymethod.serialize_field" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/mod.rs.html#1959-1965" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.serialize_field" class="fnname">serialize_field</a><T: ?<a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(<br> &mut self, <br> key: &'static <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>, <br> value: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T<br>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../trait.Serialize.html" title="trait serde::Serialize">Serialize</a>, </span></h4></div></summary><div class="docblock"><p>Serialize a struct variant field.</p>
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</div></details><details class="rustdoc-toggle" open><summary><div id="tymethod.end" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/mod.rs.html#1975" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.end" class="fnname">end</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Ok" title="type serde::ser::SerializeStructVariant::Ok">Ok</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>></h4></div></summary><div class="docblock"><p>Finish serializing a struct variant.</p>
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</div></details></div><h2 id="provided-methods" class="small-section-header">Provided methods<a href="#provided-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="method.skip_field" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/mod.rs.html#1969-1972" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#method.skip_field" class="fnname">skip_field</a>(&mut self, key: &'static <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.unit.html">()</a>, Self::<a class="associatedtype" href="trait.SerializeStructVariant.html#associatedtype.Error" title="type serde::ser::SerializeStructVariant::Error">Error</a>></h4></div></summary><div class="docblock"><p>Indicate that a struct variant field has been skipped.</p>
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</div></details></div><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-SerializeStructVariant" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/ser/impossible.rs.html#197-216" title="goto source code">[src]</a></div><a href="#impl-SerializeStructVariant" class="anchor"></a><h3 class="code-header in-band">impl<Ok, Error> <a class="trait" href="trait.SerializeStructVariant.html" title="trait serde::ser::SerializeStructVariant">SerializeStructVariant</a> for <a class="struct" href="struct.Impossible.html" title="struct serde::ser::Impossible">Impossible</a><Ok, Error> <span class="where fmt-newline">where<br> Error: <a class="trait" href="trait.Error.html" title="trait serde::ser::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Ok-1" class="type trait-impl has-srclink"><a href="#associatedtype.Ok-1" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Ok" class="associatedtype">Ok</a> = Ok</h4></div><div id="associatedtype.Error-1" class="type trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = Error</h4></div></div></details></div><script type="text/javascript" src="../../implementors/serde/ser/trait.SerializeStructVariant.js" async></script></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="serde" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.59.0 (9d1b2106e 2022-02-23)" ></div>
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