| <!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="Provides a `Visitor` access to the data of an enum in the input."><meta name="keywords" content="rust, rustlang, rust-lang, EnumAccess"><title>EnumAccess in serde::de - 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 EnumAccess</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.Variant">Variant</a></div><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><div class="sidebar-links"><a href="#tymethod.variant_seed">variant_seed</a></div><h3 class="sidebar-title"><a href="#provided-methods">Provided Methods</a></h3><div class="sidebar-links"><a href="#method.variant">variant</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">de</a></h2><div id="sidebar-vars" data-name="EnumAccess" 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> |
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| <h1 class="fqn"><span class="in-band">Trait <a href="../index.html">serde</a>::<wbr><a href="index.html">de</a>::<wbr><a class="trait" href="#">EnumAccess</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></h1><span class="out-of-band"> |
| <a class="srclink" href="../../src/serde/de/mod.rs.html#1971-1998" title="goto source code">source</a> · |
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| <div class="docblock item-decl"><pre class="rust trait"><code>pub trait EnumAccess<'de>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> { |
| type <a href="#associatedtype.Error" class="associatedtype">Error</a>: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>; |
| type <a href="#associatedtype.Variant" class="associatedtype">Variant</a>: <a class="trait" href="trait.VariantAccess.html" title="trait serde::de::VariantAccess">VariantAccess</a><'de, Error = Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>>; |
| fn <a href="#tymethod.variant_seed" class="fnname">variant_seed</a><V>(<br> self, <br> seed: V<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V::<a class="associatedtype" href="trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>><br> <span class="where">where<br> V: <a class="trait" href="trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de></span>; |
| |
| fn <a href="#method.variant" class="fnname">variant</a><V>(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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>><br> <span class="where">where<br> V: <a class="trait" href="../trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de></span>, |
| { ... } |
| }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Provides a <code>Visitor</code> access to the data of an enum in the input.</p> |
| <p><code>EnumAccess</code> is created by the <code>Deserializer</code> and passed to the |
| <code>Visitor</code> in order to identify which variant of an enum to deserialize.</p> |
| <h2 id="lifetime" class="section-header"><a href="#lifetime">Lifetime</a></h2> |
| <p>The <code>'de</code> lifetime of this trait is the lifetime of data that may be |
| borrowed by the deserialized enum variant. See the page <a href="https://serde.rs/lifetimes.html">Understanding |
| deserializer lifetimes</a> for a more detailed explanation of these lifetimes.</p> |
| <h2 id="example-implementation" class="section-header"><a href="#example-implementation">Example implementation</a></h2> |
| <p>The <a href="https://serde.rs/data-format.html">example data format</a> presented on the website demonstrates an |
| implementation of <code>EnumAccess</code> for a basic JSON data format.</p> |
| </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.Error" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1974" title="goto source code">source</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::de::Error">Error</a></h4></div></summary><div class="docblock"><p>The error type that can be returned if some error occurs during |
| deserialization.</p> |
| </div></details><details class="rustdoc-toggle" open><summary><div id="associatedtype.Variant" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1977" title="goto source code">source</a></div><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a>: <a class="trait" href="trait.VariantAccess.html" title="trait serde::de::VariantAccess">VariantAccess</a><'de, Error = Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>></h4></div></summary><div class="docblock"><p>The <code>Visitor</code> that will be used to deserialize the content of the enum |
| variant.</p> |
| </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.variant_seed" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1983-1985" title="goto source code">source</a></div><h4 class="code-header">fn <a href="#tymethod.variant_seed" class="fnname">variant_seed</a><V>(<br> self, <br> seed: V<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V::<a class="associatedtype" href="trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>> <span class="where fmt-newline">where<br> V: <a class="trait" href="trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de>, </span></h4></div></summary><div class="docblock"><p><code>variant</code> is called to identify which variant to deserialize.</p> |
| <p><code>Deserialize</code> implementations should typically use <code>EnumAccess::variant</code> |
| instead.</p> |
| </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.variant" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1992-1997" title="goto source code">source</a></div><h4 class="code-header">fn <a href="#method.variant" class="fnname">variant</a><V>(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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>> <span class="where fmt-newline">where<br> V: <a class="trait" href="../trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de>, </span></h4></div></summary><div class="docblock"><p><code>variant</code> is called to identify which variant to deserialize.</p> |
| <p>This method exists as a convenience for <code>Deserialize</code> implementations. |
| <code>EnumAccess</code> implementations should not override the default behavior.</p> |
| </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-EnumAccess%3C%27de%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#705-718" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E" class="anchor"></a><h3 class="code-header in-band">impl<'de, 'a, E> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.CowStrDeserializer.html" title="struct serde::de::value::CowStrDeserializer">CowStrDeserializer</a><'a, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><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> = E</h4></div><div id="associatedtype.Variant-1" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-1" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = UnitOnly<E></h4></div></div></details><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-EnumAccess%3C%27de%3E-1" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#434-447" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E-1" class="anchor"></a><h3 class="code-header in-band">impl<'de, 'a, E> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.StrDeserializer.html" title="struct serde::de::value::StrDeserializer">StrDeserializer</a><'a, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Error-2" class="type trait-impl has-srclink"><a href="#associatedtype.Error-2" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = E</h4></div><div id="associatedtype.Variant-2" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-2" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = UnitOnly<E></h4></div></div></details><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-EnumAccess%3C%27de%3E-2" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#607-620" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E-2" class="anchor"></a><h3 class="code-header in-band">impl<'de, 'a, E> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.StringDeserializer.html" title="struct serde::de::value::StringDeserializer">StringDeserializer</a><E> <span class="where fmt-newline">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Error-3" class="type trait-impl has-srclink"><a href="#associatedtype.Error-3" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = E</h4></div><div id="associatedtype.Variant-3" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-3" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = UnitOnly<E></h4></div></div></details><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-EnumAccess%3C%27de%3E-3" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#1449-1465" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E-3" class="anchor"></a><h3 class="code-header in-band">impl<'de, A> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.MapAccessDeserializer.html" title="struct serde::de::value::MapAccessDeserializer">MapAccessDeserializer</a><A> <span class="where fmt-newline">where<br> A: <a class="trait" href="trait.MapAccess.html" title="trait serde::de::MapAccess">MapAccess</a><'de>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Error-4" class="type trait-impl has-srclink"><a href="#associatedtype.Error-4" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = A::<a class="associatedtype" href="trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a></h4></div><div id="associatedtype.Variant-4" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-4" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = MapAsEnum<A></h4></div></div></details><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-EnumAccess%3C%27de%3E-4" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#513-526" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E-4" class="anchor"></a><h3 class="code-header in-band">impl<'de, E> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.BorrowedStrDeserializer.html" title="struct serde::de::value::BorrowedStrDeserializer">BorrowedStrDeserializer</a><'de, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Error-5" class="type trait-impl has-srclink"><a href="#associatedtype.Error-5" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = E</h4></div><div id="associatedtype.Variant-5" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-5" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = UnitOnly<E></h4></div></div></details><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-EnumAccess%3C%27de%3E-5" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/value.rs.html#352-365" title="goto source code">source</a></div><a href="#impl-EnumAccess%3C%27de%3E-5" class="anchor"></a><h3 class="code-header in-band">impl<'de, E> <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de> for <a class="struct" href="value/struct.U32Deserializer.html" title="struct serde::de::value::U32Deserializer">U32Deserializer</a><E> <span class="where fmt-newline">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a>, </span></h3></div></summary><div class="impl-items"><div id="associatedtype.Error-6" class="type trait-impl has-srclink"><a href="#associatedtype.Error-6" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Error" class="associatedtype">Error</a> = E</h4></div><div id="associatedtype.Variant-6" class="type trait-impl has-srclink"><a href="#associatedtype.Variant-6" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Variant" class="associatedtype">Variant</a> = UnitOnly<E></h4></div></div></details></div><script type="text/javascript" src="../../implementors/serde/de/trait.EnumAccess.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="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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