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Trac3r-rust/doc/serde/de/trait.Visitor.html

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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 `Visitor` trait in crate `serde`."><meta name="keywords" content="rust, rustlang, rust-lang, Visitor"><title>serde::de::Visitor - 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">&#9776;</div><a href='../../serde/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><p class='location'>Trait Visitor</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Value">Value</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.expecting">expecting</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.visit_bool">visit_bool</a><a href="#method.visit_borrowed_bytes">visit_borrowed_bytes</a><a href="#method.visit_borrowed_str">visit_borrowed_str</a><a href="#method.visit_byte_buf">visit_byte_buf</a><a href="#method.visit_bytes">visit_bytes</a><a href="#method.visit_char">visit_char</a><a href="#method.visit_enum">visit_enum</a><a href="#method.visit_f32">visit_f32</a><a href="#method.visit_f64">visit_f64</a><a href="#method.visit_i128">visit_i128</a><a href="#method.visit_i16">visit_i16</a><a href="#method.visit_i32">visit_i32</a><a href="#method.visit_i64">visit_i64</a><a href="#method.visit_i8">visit_i8</a><a href="#method.visit_map">visit_map</a><a href="#method.visit_newtype_struct">visit_newtype_struct</a><a href="#method.visit_none">visit_none</a><a href="#method.visit_seq">visit_seq</a><a href="#method.visit_some">visit_some</a><a href="#method.visit_str">visit_str</a><a href="#method.visit_string">visit_string</a><a href="#method.visit_u128">visit_u128</a><a href="#method.visit_u16">visit_u16</a><a href="#method.visit_u32">visit_u32</a><a href="#method.visit_u64">visit_u64</a><a href="#method.visit_u8">visit_u8</a><a href="#method.visit_unit">visit_unit</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>serde</a>::<wbr><a href='index.html'>de</a></p><script>window.sidebarCurrent = {name: 'Visitor', 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:voi
type <a href='#associatedtype.Value' class="type">Value</a>;
fn <a href='#tymethod.expecting' class='fnname'>expecting</a>(&amp;self, formatter: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>;
fn <a href='#method.visit_bool' class='fnname'>visit_bool</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_i8' class='fnname'>visit_i8</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_i16' class='fnname'>visit_i16</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_i32' class='fnname'>visit_i32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_i64' class='fnname'>visit_i64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_i128' class='fnname'>visit_i128</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_u8' class='fnname'>visit_u8</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_u16' class='fnname'>visit_u16</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_u32' class='fnname'>visit_u32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_u64' class='fnname'>visit_u64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_u128' class='fnname'>visit_u128</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u128.html">u128</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_f32' class='fnname'>visit_f32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_f64' class='fnname'>visit_f64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_char' class='fnname'>visit_char</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_str' class='fnname'>visit_str</a>&lt;E&gt;(self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_borrowed_str' class='fnname'>visit_borrowed_str</a>&lt;E&gt;(self, v: &amp;'de <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_string' class='fnname'>visit_string</a>&lt;E&gt;(self, v: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_bytes' class='fnname'>visit_bytes</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_borrowed_bytes' class='fnname'>visit_borrowed_bytes</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;'de [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_byte_buf' class='fnname'>visit_byte_buf</a>&lt;E&gt;(self, v: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_none' class='fnname'>visit_none</a>&lt;E&gt;(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_some' class='fnname'>visit_some</a>&lt;D&gt;(self, deserializer: D) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="type" href="../../serde/trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D: <a class="trait" href="../../serde/trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a>&lt;'de&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_unit' class='fnname'>visit_unit</a>&lt;E&gt;(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_newtype_struct' class='fnname'>visit_newtype_struct</a>&lt;D&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;deserializer: D<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="type" href="../../serde/trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D: <a class="trait" href="../../serde/trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a>&lt;'de&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_seq' class='fnname'>visit_seq</a>&lt;A&gt;(self, seq: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a>&lt;'de&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_map' class='fnname'>visit_map</a>&lt;A&gt;(self, map: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.MapAccess.html" title="trait serde::de::MapAccess">MapAccess</a>&lt;'de&gt;</span>,
{ ... }
<div class='item-spacer'></div> fn <a href='#method.visit_enum' class='fnname'>visit_enum</a>&lt;A&gt;(self, data: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a>&lt;'de&gt;</span>,
{ ... }
}</pre></div><div class='docblock'><p>This trait represents a visitor that walks through a deserializer.</p>
<h1 id="lifetime" class="section-header"><a href="#lifetime">Lifetime</a></h1>
<p>The <code>'de</code> lifetime of this trait is the requirement for lifetime of data
that may be borrowed by <code>Self::Value</code>. See the page <a href="https://serde.rs/lifetimes.html">Understanding
deserializer lifetimes</a> for a more detailed explanation of these lifetimes.</p>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<pre><code class="language-edition2018"># use std::fmt;
#
# use serde::de::{self, Unexpected, Visitor};
#
/// A visitor that deserializes a long string - a string containing at least
/// some minimum number of bytes.
struct LongString {
min: usize,
}
impl&lt;'de&gt; Visitor&lt;'de&gt; for LongString {
type Value = String;
fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {
write!(formatter, &quot;a string containing at least {} bytes&quot;, self.min)
}
fn visit_str&lt;E&gt;(self, s: &amp;str) -&gt; Result&lt;Self::Value, E&gt;
where
E: de::Error,
{
if s.len() &gt;= self.min {
Ok(s.to_owned())
} else {
Err(de::Error::invalid_value(Unexpected::Str(s), &amp;self))
}
}
}
</code></pre>
</div>
<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.Value' class='method'><code id='Value.t'>type <a href='#associatedtype.Value' class="type">Value</a></code></h3><div class='docblock'><p>The value produced by this visitor.</p>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.expecting' class='method'><code id='expecting.v'>fn <a href='#tymethod.expecting' class='fnname'>expecting</a>(&amp;self, formatter: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></h3><div class='docblock'><p>Format a message stating what data this Visitor expects to receive.</p>
<p>This is used in error messages. The message should complete the sentence
&quot;This Visitor expects to receive ...&quot;, for example the message could be
&quot;an integer between 0 and 64&quot;. The message should not be capitalized and
should not end with a period.</p>
<pre><code class="language-edition2018"># use std::fmt;
#
# struct S {
# max: usize,
# }
#
# impl&lt;'de&gt; serde::de::Visitor&lt;'de&gt; for S {
# type Value = ();
#
fn expecting(&amp;self, formatter: &amp;mut fmt::Formatter) -&gt; fmt::Result {
write!(formatter, &quot;an integer between 0 and {}&quot;, self.max)
}
# }
</code></pre>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.visit_bool' class='method'><code id='visit_bool.v'>fn <a href='#method.visit_bool' class='fnname'>visit_bool</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a boolean.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_i8' class='method'><code id='visit_i8.v'>fn <a href='#method.visit_i8' class='fnname'>visit_i8</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>i8</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_i64"><code>visit_i64</code></a>.</p>
</div><h3 id='method.visit_i16' class='method'><code id='visit_i16.v'>fn <a href='#method.visit_i16' class='fnname'>visit_i16</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i16.html">i16</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>i16</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_i64"><code>visit_i64</code></a>.</p>
</div><h3 id='method.visit_i32' class='method'><code id='visit_i32.v'>fn <a href='#method.visit_i32' class='fnname'>visit_i32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>i32</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_i64"><code>visit_i64</code></a>.</p>
</div><h3 id='method.visit_i64' class='method'><code id='visit_i64.v'>fn <a href='#method.visit_i64' class='fnname'>visit_i64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>i64</code>.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_i128' class='method'><code id='visit_i128.v'>fn <a href='#method.visit_i128' class='fnname'>visit_i128</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i128.html">i128</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>i128</code>.</p>
<p>This method is available only on Rust compiler versions &gt;=1.26. The
default implementation fails with a type error.</p>
</div><h3 id='method.visit_u8' class='method'><code id='visit_u8.v'>fn <a href='#method.visit_u8' class='fnname'>visit_u8</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>u8</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_u64"><code>visit_u64</code></a>.</p>
</div><h3 id='method.visit_u16' class='method'><code id='visit_u16.v'>fn <a href='#method.visit_u16' class='fnname'>visit_u16</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u16.html">u16</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>u16</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_u64"><code>visit_u64</code></a>.</p>
</div><h3 id='method.visit_u32' class='method'><code id='visit_u32.v'>fn <a href='#method.visit_u32' class='fnname'>visit_u32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>u32</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_u64"><code>visit_u64</code></a>.</p>
</div><h3 id='method.visit_u64' class='method'><code id='visit_u64.v'>fn <a href='#method.visit_u64' class='fnname'>visit_u64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>u64</code>.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_u128' class='method'><code id='visit_u128.v'>fn <a href='#method.visit_u128' class='fnname'>visit_u128</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u128.html">u128</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>u128</code>.</p>
<p>This method is available only on Rust compiler versions &gt;=1.26. The
default implementation fails with a type error.</p>
</div><h3 id='method.visit_f32' class='method'><code id='visit_f32.v'>fn <a href='#method.visit_f32' class='fnname'>visit_f32</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>f32</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_f64"><code>visit_f64</code></a>.</p>
</div><h3 id='method.visit_f64' class='method'><code id='visit_f64.v'>fn <a href='#method.visit_f64' class='fnname'>visit_f64</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an <code>f64</code>.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_char' class='method'><code id='visit_char.v'>fn <a href='#method.visit_char' class='fnname'>visit_char</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a <code>char</code>.</p>
<p>The default implementation forwards to <a href="#method.visit_str"><code>visit_str</code></a> as a one-character
string.</p>
</div><h3 id='method.visit_str' class='method'><code id='visit_str.v'>fn <a href='#method.visit_str' class='fnname'>visit_str</a>&lt;E&gt;(self, v: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a string. The lifetime of the string is ephemeral and
it may be destroyed after this method returns.</p>
<p>This method allows the <code>Deserializer</code> to avoid a copy by retaining
ownership of any buffered data. <code>Deserialize</code> implementations that do
not benefit from taking ownership of <code>String</code> data should indicate that
to the deserializer by using <code>Deserializer::deserialize_str</code> rather than
<code>Deserializer::deserialize_string</code>.</p>
<p>It is never correct to implement <code>visit_string</code> without implementing
<code>visit_str</code>. Implement neither, both, or just <code>visit_str</code>.</p>
</div><h3 id='method.visit_borrowed_str' class='method'><code id='visit_borrowed_str.v'>fn <a href='#method.visit_borrowed_str' class='fnname'>visit_borrowed_str</a>&lt;E&gt;(self, v: &amp;'de <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a string that lives at least as long as the
<code>Deserializer</code>.</p>
<p>This enables zero-copy deserialization of strings in some formats. For
example JSON input containing the JSON string <code>&quot;borrowed&quot;</code> can be
deserialized with zero copying into a <code>&amp;'a str</code> as long as the input
data outlives <code>'a</code>.</p>
<p>The default implementation forwards to <code>visit_str</code>.</p>
</div><h3 id='method.visit_string' class='method'><code id='visit_string.v'>fn <a href='#method.visit_string' class='fnname'>visit_string</a>&lt;E&gt;(self, v: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a string and ownership of the string is being given
to the <code>Visitor</code>.</p>
<p>This method allows the <code>Visitor</code> to avoid a copy by taking ownership of
a string created by the <code>Deserializer</code>. <code>Deserialize</code> implementations
that benefit from taking ownership of <code>String</code> data should indicate that
to the deserializer by using <code>Deserializer::deserialize_string</code> rather
than <code>Deserializer::deserialize_str</code>, although not every deserializer
will honor such a request.</p>
<p>It is never correct to implement <code>visit_string</code> without implementing
<code>visit_str</code>. Implement neither, both, or just <code>visit_str</code>.</p>
<p>The default implementation forwards to <code>visit_str</code> and then drops the
<code>String</code>.</p>
</div><h3 id='method.visit_bytes' class='method'><code id='visit_bytes.v'>fn <a href='#method.visit_bytes' class='fnname'>visit_bytes</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a byte array. The lifetime of the byte array is
ephemeral and it may be destroyed after this method returns.</p>
<p>This method allows the <code>Deserializer</code> to avoid a copy by retaining
ownership of any buffered data. <code>Deserialize</code> implementations that do
not benefit from taking ownership of <code>Vec&lt;u8&gt;</code> data should indicate that
to the deserializer by using <code>Deserializer::deserialize_bytes</code> rather
than <code>Deserializer::deserialize_byte_buf</code>.</p>
<p>It is never correct to implement <code>visit_byte_buf</code> without implementing
<code>visit_bytes</code>. Implement neither, both, or just <code>visit_bytes</code>.</p>
</div><h3 id='method.visit_borrowed_bytes' class='method'><code id='visit_borrowed_bytes.v'>fn <a href='#method.visit_borrowed_bytes' class='fnname'>visit_borrowed_bytes</a>&lt;E&gt;(self, v: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;'de [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a byte array that lives at least as long as the
<code>Deserializer</code>.</p>
<p>This enables zero-copy deserialization of bytes in some formats. For
example Bincode data containing bytes can be deserialized with zero
copying into a <code>&amp;'a [u8]</code> as long as the input data outlives <code>'a</code>.</p>
<p>The default implementation forwards to <code>visit_bytes</code>.</p>
</div><h3 id='method.visit_byte_buf' class='method'><code id='visit_byte_buf.v'>fn <a href='#method.visit_byte_buf' class='fnname'>visit_byte_buf</a>&lt;E&gt;(self, v: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a byte array and ownership of the byte array is being
given to the <code>Visitor</code>.</p>
<p>This method allows the <code>Visitor</code> to avoid a copy by taking ownership of
a byte buffer created by the <code>Deserializer</code>. <code>Deserialize</code>
implementations that benefit from taking ownership of <code>Vec&lt;u8&gt;</code> data
should indicate that to the deserializer by using
<code>Deserializer::deserialize_byte_buf</code> rather than
<code>Deserializer::deserialize_bytes</code>, although not every deserializer will
honor such a request.</p>
<p>It is never correct to implement <code>visit_byte_buf</code> without implementing
<code>visit_bytes</code>. Implement neither, both, or just <code>visit_bytes</code>.</p>
<p>The default implementation forwards to <code>visit_bytes</code> and then drops the
<code>Vec&lt;u8&gt;</code>.</p>
</div><h3 id='method.visit_none' class='method'><code id='visit_none.v'>fn <a href='#method.visit_none' class='fnname'>visit_none</a>&lt;E&gt;(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an optional that is absent.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_some' class='method'><code id='visit_some.v'>fn <a href='#method.visit_some' class='fnname'>visit_some</a>&lt;D&gt;(self, deserializer: D) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="type" href="../../serde/trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;D: <a class="trait" href="../../serde/trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a>&lt;'de&gt;,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an optional that is present.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_unit' class='method'><code id='visit_unit.v'>fn <a href='#method.visit_unit' class='fnname'>visit_unit</a>&lt;E&gt;(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a unit <code>()</code>.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_newtype_struct' class='method'><code id='visit_newtype_struct.v'>fn <a href='#method.visit_newtype_struct' class='fnname'>visit_newtype_struct</a>&lt;D&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;deserializer: D<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="type" href="../../serde/trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;D: <a class="trait" href="../../serde/trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a>&lt;'de&gt;,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a newtype struct.</p>
<p>The content of the newtype struct may be read from the given
<code>Deserializer</code>.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_seq' class='method'><code id='visit_seq.v'>fn <a href='#method.visit_seq' class='fnname'>visit_seq</a>&lt;A&gt;(self, seq: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a>&lt;'de&gt;,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a sequence of elements.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_map' class='method'><code id='visit_map.v'>fn <a href='#method.visit_map' class='fnname'>visit_map</a>&lt;A&gt;(self, map: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.MapAccess.html" title="trait serde::de::MapAccess">MapAccess</a>&lt;'de&gt;,&nbsp;</span></code></h3><div class='docblock'><p>The input contains a key-value map.</p>
<p>The default implementation fails with a type error.</p>
</div><h3 id='method.visit_enum' class='method'><code id='visit_enum.v'>fn <a href='#method.visit_enum' class='fnname'>visit_enum</a>&lt;A&gt;(self, data: A) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a>&lt;'de&gt;,&nbsp;</span></code></h3><div class='docblock'><p>The input contains an enum.</p>
<p>The default implementation fails with a type error.</p>
</div></div><span class='loading-content'>Loading content...</span>
<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-Visitor%3C%27de%3E' class='impl'><code class='in-band'>impl&lt;'de&gt; Visitor&lt;'de&gt; for <a class="struct" href="../../serde/de/struct.IgnoredAny.html" title="struct serde::de::IgnoredAny">IgnoredAny</a></code><a href='#impl-Visitor%3C%27de%3E' class='anchor'></a><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#114-217' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Value-1' class="type"><code id='Value.t-1'>type <a href='#associatedtype.Value-1' class="type">Value</a> = <a class="struct" href="../../serde/de/struct.IgnoredAny.html" title="struct serde::de::IgnoredAny">IgnoredAny</a></code></h4><h4 id='method.expecting' class="method hidden"><code id='expecting.v-1'>fn <a href='#method.expecting' class='fnname'>expecting</a>(&amp;self, formatter: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#117-119' title='goto source code'>[src]</a></h4><h4 id='method.visit_bool-1' class="method hidden"><code id='visit_bool.v-1'>fn <a href='#method.visit_bool-1' class='fnname'>visit_bool</a>&lt;E&gt;(self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;</code><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#122-125' title='goto source code'>[src]</a></h4><h4 id='method.visit_i64-1' class="method hidden"><code id='visit_i64.v-1'>fn <a href='#method.visit_i64-1' class='fnname'>visit_i64</a>&lt;E&gt;(self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;</code><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#128-131' title='goto source code'>[src]</a></h4><h4 id='method.visit_u64-1' class="method hidden"><code id='visit_u64.v-1'>fn <a href='#method.visit_u64-1' class='fnname'>visit_u64</a>&lt;E&gt;(self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;</code><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#134-137' title='goto source code'>[src]</a></h4><h4 id='method.visit_f64-1' class="method hidden"><code id='visit_f64.v-1'>fn <a href='#method.visit_f64-1' class='fnname'>visit_f64</a>&lt;E&gt;(self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self::<a class="type" href="../../serde/de/trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E&gt;</code><a class='srclink' href='../../src/serde/de/ignored_any.rs.html#140-143' title='goto source code'>[src]</a></h4><h4 id='method.visit_str-1' class="method hidden"><code id='visit_str.v-1'>fn <a href='#method.visit_str
src="../../implementors/serde/de/trait.Visitor.js">
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