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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="`Expected` represents an explanation of what data a `Visitor` was expecting to receive."><meta name="keywords" content="rust, rustlang, rust-lang, Expected"><title>Expected 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 Expected</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><div class="sidebar-links"><a href="#tymethod.fmt">fmt</a></div><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><div class="sidebar-links"><a href="#impl-Expected-for-%26%27a%20str">&'a str</a></div><h3 class="sidebar-title"><a href="#trait-implementations">Trait Implementations</a></h3><div class="sidebar-links"><a href="#impl-Display">Display</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="Expected" 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">de</a>::<wbr><a class="trait" href="#">Expected</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/de/mod.rs.html#471-475" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Expected {
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fn <a href="#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.59.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</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><code>Expected</code> represents an explanation of what data a <code>Visitor</code> was expecting
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to receive.</p>
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<p>This is used as an argument to the <code>invalid_type</code>, <code>invalid_value</code>, and
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<code>invalid_length</code> methods of the <code>Error</code> trait to build error messages. The
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message should be a noun or noun phrase that completes the sentence “This
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Visitor expects to receive …”, for example the message could be “an
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integer between 0 and 64”. The message should not be capitalized and should
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not end with a period.</p>
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<p>Within the context of a <code>Visitor</code> implementation, the <code>Visitor</code> itself
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(<code>&self</code>) is an implementation of this trait.</p>
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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">fn</span> <span class="ident">visit_bool</span><span class="op"><</span><span class="ident">E</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">bool</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident"><span class="self">Self</span>::Value</span>, <span class="ident">E</span><span class="op">></span>
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<span class="kw">where</span>
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<span class="ident">E</span>: <span class="ident">de::Error</span>,
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{
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<span class="prelude-val">Err</span>(<span class="ident">de::Error::invalid_type</span>(<span class="ident">Unexpected::Bool</span>(<span class="ident">v</span>), <span class="kw-2">&</span><span class="self">self</span>))
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}</code></pre></div>
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<p>Outside of a <code>Visitor</code>, <code>&"..."</code> can be used.</p>
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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">return</span> <span class="prelude-val">Err</span>(<span class="ident">de::Error::invalid_type</span>(<span class="ident">Unexpected::Bool</span>(<span class="ident">v</span>), <span class="kw-2">&</span><span class="string">"a negative integer"</span>));</code></pre></div>
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</div></details><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.fmt" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#474" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.59.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></div></summary><div class="docblock"><p>Format an explanation of what data was being expected. Same signature as
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the <code>Display</code> and <code>Debug</code> traits.</p>
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</div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Display" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#492-496" title="goto source code">[src]</a></div><a href="#impl-Display" class="anchor"></a><h3 class="code-header in-band">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for dyn <a class="trait" href="trait.Expected.html" title="trait serde::de::Expected">Expected</a> + 'a</h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.fmt" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#493-495" title="goto source code">[src]</a></div><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Display.html#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.59.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></div></summary><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
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</div></details></div></details></div><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-Expected-for-%26%27a%20str" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#486-490" title="goto source code">[src]</a></div><a href="#impl-Expected-for-%26%27a%20str" class="anchor"></a><h3 class="code-header in-band">impl<'a> <a class="trait" href="trait.Expected.html" title="trait serde::de::Expected">Expected</a> for &'a <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a></h3></div></summary><div class="impl-items"><div id="method.fmt-1" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#487-489" title="goto source code">[src]</a></div><a href="#method.fmt-1" class="anchor"></a><h4 class="code-header">fn <a href="#tymethod.fmt" class="fnname">fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.59.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></div></div></details><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><div id="impl-Expected" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#477-484" title="goto source code">[src]</a></div><a href="#impl-Expected" class="anchor"></a><h3 class="code-header in-band">impl<'de, T> <a class="trait" href="trait.Expected.html" title="trait serde::de::Expected">Expected</a> for T <span class="where fmt-newline">where<br> T: <a class="trait" href="trait.Visitor.html" title="trait serde::de::Visitor">Visitor</a><'de>, </span></h3></div></div><script type="text/javascript" src="../../implementors/serde/de/trait.Expected.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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