203 lines
63 KiB
HTML
203 lines
63 KiB
HTML
<!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="This trait represents a visitor that walks through a deserializer."><meta name="keywords" content="rust, rustlang, rust-lang, Visitor"><title>Visitor 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 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class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../serde/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../serde/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Visitor</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#required-associated-types">Required Associated Types</a></h3><ul><li><a href="#associatedtype.Value">Value</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><ul><li><a href="#tymethod.expecting">expecting</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#provided-methods">Provided Methods</a></h3><ul><li><a href="#method.visit_bool">visit_bool</a></li><li><a href="#method.visit_borrowed_bytes">visit_borrowed_bytes</a></li><li><a href="#method.visit_borrowed_str">visit_borrowed_str</a></li><li><a href="#method.visit_byte_buf">visit_byte_buf</a></li><li><a href="#method.visit_bytes">visit_bytes</a></li><li><a href="#method.visit_char">visit_char</a></li><li><a href="#method.visit_enum">visit_enum</a></li><li><a href="#method.visit_f32">visit_f32</a></li><li><a href="#method.visit_f64">visit_f64</a></li><li><a href="#method.visit_i128">visit_i128</a></li><li><a href="#method.visit_i16">visit_i16</a></li><li><a href="#method.visit_i32">visit_i32</a></li><li><a href="#method.visit_i64">visit_i64</a></li><li><a href="#method.visit_i8">visit_i8</a></li><li><a href="#method.visit_map">visit_map</a></li><li><a href="#method.visit_newtype_struct">visit_newtype_struct</a></li><li><a href="#method.visit_none">visit_none</a></li><li><a href="#method.visit_seq">visit_seq</a></li><li><a href="#method.visit_some">visit_some</a></li><li><a href="#method.visit_str">visit_str</a></li><li><a href="#method.visit_string">visit_string</a></li><li><a href="#method.visit_u128">visit_u128</a></li><li><a href="#method.visit_u16">visit_u16</a></li><li><a href="#method.visit_u32">visit_u32</a></li><li><a href="#method.visit_u64">visit_u64</a></li><li><a href="#method.visit_u8">visit_u8</a></li><li><a href="#method.visit_unit">visit_unit</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In serde::de</a></h2></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.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><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="#">Visitor</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#1282-1684">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Visitor<'de>: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
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type <a href="#associatedtype.Value" class="associatedtype">Value</a>;
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<details class="rustdoc-toggle type-contents-toggle"><summary class="hideme"><span>Show 28 methods</span></summary> fn <a href="#tymethod.expecting" class="fnname">expecting</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.64.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.64.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>;
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fn <a href="#method.visit_bool" class="fnname">visit_bool</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_i8" class="fnname">visit_i8</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i8.html">i8</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_i16" class="fnname">visit_i16</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i16.html">i16</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_i32" class="fnname">visit_i32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i32.html">i32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_i64" class="fnname">visit_i64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i64.html">i64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_i128" class="fnname">visit_i128</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i128.html">i128</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_u8" class="fnname">visit_u8</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_u16" class="fnname">visit_u16</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u16.html">u16</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_u32" class="fnname">visit_u32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_u64" class="fnname">visit_u64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u64.html">u64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_u128" class="fnname">visit_u128</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u128.html">u128</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_f32" class="fnname">visit_f32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.f32.html">f32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_f64" class="fnname">visit_f64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.f64.html">f64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_char" class="fnname">visit_char</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.char.html">char</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_str" class="fnname">visit_str</a><E>(self, v: &<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_borrowed_str" class="fnname">visit_borrowed_str</a><E>(self, v: &'de <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_string" class="fnname">visit_string</a><E>(self, v: <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_bytes" class="fnname">visit_bytes</a><E>(self, v: &[<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_borrowed_bytes" class="fnname">visit_borrowed_bytes</a><E>(self, v: &'de [<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_byte_buf" class="fnname">visit_byte_buf</a><E>(self, v: <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_none" class="fnname">visit_none</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_some" class="fnname">visit_some</a><D>(self, deserializer: D) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="associatedtype" href="../trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>><br> <span class="where">where<br> D: <a class="trait" href="../trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a><'de></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_unit" class="fnname">visit_unit</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, E><br> <span class="where">where<br> E: <a class="trait" href="trait.Error.html" title="trait serde::de::Error">Error</a></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_newtype_struct" class="fnname">visit_newtype_struct</a><D>(<br> self,<br> deserializer: D<br> ) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="associatedtype" href="../trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>><br> <span class="where">where<br> D: <a class="trait" href="../trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a><'de></span>,
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{ ... }
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<span class="item-spacer"></span> fn <a href="#method.visit_seq" class="fnname">visit_seq</a><A>(self, seq: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>><br> <span class="where">where<br> A: <a class="trait" href="trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a><'de></span>,
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{ ... }
|
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<span class="item-spacer"></span> fn <a href="#method.visit_map" class="fnname">visit_map</a><A>(self, map: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>><br> <span class="where">where<br> A: <a class="trait" href="trait.MapAccess.html" title="trait serde::de::MapAccess">MapAccess</a><'de></span>,
|
||
{ ... }
|
||
<span class="item-spacer"></span> fn <a href="#method.visit_enum" class="fnname">visit_enum</a><A>(self, data: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>><br> <span class="where">where<br> A: <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de></span>,
|
||
{ ... }
|
||
</details>}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This trait represents a visitor that walks through a deserializer.</p>
|
||
<h2 id="lifetime"><a href="#lifetime">Lifetime</a></h2>
|
||
<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>
|
||
<h2 id="example"><a href="#example">Example</a></h2>
|
||
<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="doccomment">/// A visitor that deserializes a long string - a string containing at least</span>
|
||
<span class="doccomment">/// some minimum number of bytes.</span>
|
||
<span class="kw">struct</span> <span class="ident">LongString</span> {
|
||
<span class="ident">min</span>: <span class="ident">usize</span>,
|
||
}
|
||
|
||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="ident">Visitor</span><span class="op"><</span><span class="lifetime">'de</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LongString</span> {
|
||
<span class="kw">type</span> <span class="ident">Value</span> <span class="op">=</span> <span class="ident">String</span>;
|
||
|
||
<span class="kw">fn</span> <span class="ident">expecting</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> {
|
||
<span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">"a string containing at least {} bytes"</span>, <span class="self">self</span>.<span class="ident">min</span>)
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">visit_str</span><span class="op"><</span><span class="ident">E</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</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>
|
||
<span class="kw">where</span>
|
||
<span class="ident">E</span>: <span class="ident">de::Error</span>,
|
||
{
|
||
<span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">></span><span class="op">=</span> <span class="self">self</span>.<span class="ident">min</span> {
|
||
<span class="prelude-val">Ok</span>(<span class="ident">s</span>.<span class="ident">to_owned</span>())
|
||
} <span class="kw">else</span> {
|
||
<span class="prelude-val">Err</span>(<span class="ident">de::Error::invalid_value</span>(<span class="ident">Unexpected::Str</span>(<span class="ident">s</span>), <span class="kw-2">&</span><span class="self">self</span>))
|
||
}
|
||
}
|
||
}</code></pre></div>
|
||
</div></details><h2 id="required-associated-types" class="small-section-header">Required Associated Types<a href="#required-associated-types" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Value" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1284">source</a></div><h4 class="code-header">type <a href="#associatedtype.Value" class="associatedtype">Value</a></h4></div></summary><div class="docblock"><p>The value produced by this visitor.</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.expecting" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1308">source</a></div><h4 class="code-header">fn <a href="#tymethod.expecting" class="fnname">expecting</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/1.64.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.64.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></div></summary><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
|
||
“This Visitor expects to receive …”, for example the message could be
|
||
“an integer between 0 and 64”. The message should not be capitalized and
|
||
should not end with a period.</p>
|
||
|
||
<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">expecting</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">formatter</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span>) -> <span class="ident">fmt::Result</span> {
|
||
<span class="macro">write!</span>(<span class="ident">formatter</span>, <span class="string">"an integer between 0 and {}"</span>, <span class="self">self</span>.<span class="ident">max</span>)
|
||
}</code></pre></div>
|
||
</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.visit_bool" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1313-1318">source</a></div><h4 class="code-header">fn <a href="#method.visit_bool" class="fnname">visit_bool</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains a boolean.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_i8" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1325-1330">source</a></div><h4 class="code-header">fn <a href="#method.visit_i8" class="fnname">visit_i8</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i8.html">i8</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_i16" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1337-1342">source</a></div><h4 class="code-header">fn <a href="#method.visit_i16" class="fnname">visit_i16</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i16.html">i16</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_i32" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1349-1354">source</a></div><h4 class="code-header">fn <a href="#method.visit_i32" class="fnname">visit_i32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i32.html">i32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_i64" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1359-1364">source</a></div><h4 class="code-header">fn <a href="#method.visit_i64" class="fnname">visit_i64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i64.html">i64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains an <code>i64</code>.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_i128" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1371-1379">source</a></div><h4 class="code-header">fn <a href="#method.visit_i128" class="fnname">visit_i128</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.i128.html">i128</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains a <code>i128</code>.</p>
|
||
<p>This method is available only on Rust compiler versions >=1.26. The
|
||
default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_u8" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1387-1392">source</a></div><h4 class="code-header">fn <a href="#method.visit_u8" class="fnname">visit_u8</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_u16" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1399-1404">source</a></div><h4 class="code-header">fn <a href="#method.visit_u16" class="fnname">visit_u16</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u16.html">u16</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_u32" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1411-1416">source</a></div><h4 class="code-header">fn <a href="#method.visit_u32" class="fnname">visit_u32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u32.html">u32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_u64" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1421-1426">source</a></div><h4 class="code-header">fn <a href="#method.visit_u64" class="fnname">visit_u64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u64.html">u64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains a <code>u64</code>.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_u128" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1433-1441">source</a></div><h4 class="code-header">fn <a href="#method.visit_u128" class="fnname">visit_u128</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u128.html">u128</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains a <code>u128</code>.</p>
|
||
<p>This method is available only on Rust compiler versions >=1.26. The
|
||
default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_f32" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1449-1454">source</a></div><h4 class="code-header">fn <a href="#method.visit_f32" class="fnname">visit_f32</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.f32.html">f32</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_f64" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1459-1464">source</a></div><h4 class="code-header">fn <a href="#method.visit_f64" class="fnname">visit_f64</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.f64.html">f64</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains an <code>f64</code>.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_char" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1473-1478">source</a></div><h4 class="code-header">fn <a href="#method.visit_char" class="fnname">visit_char</a><E>(self, v: <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.char.html">char</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_str" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1491-1496">source</a></div><h4 class="code-header">fn <a href="#method.visit_str" class="fnname">visit_str</a><E>(self, v: &<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_borrowed_str" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1508-1513">source</a></div><h4 class="code-header">fn <a href="#method.visit_borrowed_str" class="fnname">visit_borrowed_str</a><E>(self, v: &'de <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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>"borrowed"</code> can be
|
||
deserialized with zero copying into a <code>&'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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_string" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1532-1537">source</a></div><h4 class="code-header">fn <a href="#method.visit_string" class="fnname">visit_string</a><E>(self, v: <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_bytes" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1550-1556">source</a></div><h4 class="code-header">fn <a href="#method.visit_bytes" class="fnname">visit_bytes</a><E>(self, v: &[<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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<u8></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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_borrowed_bytes" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1567-1572">source</a></div><h4 class="code-header">fn <a href="#method.visit_borrowed_bytes" class="fnname">visit_borrowed_bytes</a><E>(self, v: &'de [<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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 Postcard data containing bytes can be deserialized with zero
|
||
copying into a <code>&'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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_byte_buf" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1591-1596">source</a></div><h4 class="code-header">fn <a href="#method.visit_byte_buf" class="fnname">visit_byte_buf</a><E>(self, v: <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><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<u8></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<u8></code>.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_none" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1601-1606">source</a></div><h4 class="code-header">fn <a href="#method.visit_none" class="fnname">visit_none</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains an optional that is absent.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_some" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1611-1617">source</a></div><h4 class="code-header">fn <a href="#method.visit_some" class="fnname">visit_some</a><D>(self, deserializer: D) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="associatedtype" href="../trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>> <span class="where fmt-newline">where<br> D: <a class="trait" href="../trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a><'de>, </span></h4></div></summary><div class="docblock"><p>The input contains an optional that is present.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_unit" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1622-1627">source</a></div><h4 class="code-header">fn <a href="#method.visit_unit" class="fnname">visit_unit</a><E>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</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></h4></div></summary><div class="docblock"><p>The input contains a unit <code>()</code>.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_newtype_struct" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1635-1641">source</a></div><h4 class="code-header">fn <a href="#method.visit_newtype_struct" class="fnname">visit_newtype_struct</a><D>(<br> self,<br> deserializer: D<br>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, D::<a class="associatedtype" href="../trait.Deserializer.html#associatedtype.Error" title="type serde::Deserializer::Error">Error</a>> <span class="where fmt-newline">where<br> D: <a class="trait" href="../trait.Deserializer.html" title="trait serde::Deserializer">Deserializer</a><'de>, </span></h4></div></summary><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></details><details class="rustdoc-toggle" open><summary><div id="method.visit_seq" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1646-1652">source</a></div><h4 class="code-header">fn <a href="#method.visit_seq" class="fnname">visit_seq</a><A>(self, seq: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> A: <a class="trait" href="trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a><'de>, </span></h4></div></summary><div class="docblock"><p>The input contains a sequence of elements.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_map" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1657-1663">source</a></div><h4 class="code-header">fn <a href="#method.visit_map" class="fnname">visit_map</a><A>(self, map: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</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></h4></div></summary><div class="docblock"><p>The input contains a key-value map.</p>
|
||
<p>The default implementation fails with a type error.</p>
|
||
</div></details><details class="rustdoc-toggle" open><summary><div id="method.visit_enum" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/serde/de/mod.rs.html#1668-1674">source</a></div><h4 class="code-header">fn <a href="#method.visit_enum" class="fnname">visit_enum</a><A>(self, data: A) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self::<a class="associatedtype" href="trait.Visitor.html#associatedtype.Value" title="type serde::de::Visitor::Value">Value</a>, A::<a class="associatedtype" href="trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>> <span class="where fmt-newline">where<br> A: <a class="trait" href="trait.EnumAccess.html" title="trait serde::de::EnumAccess">EnumAccess</a><'de>, </span></h4></div></summary><div class="docblock"><p>The input contains an enum.</p>
|
||
<p>The default implementation fails with a type error.</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><section id="impl-Visitor%3C%27de%3E-for-IgnoredAny" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/serde/de/ignored_any.rs.html#114-233">source</a></span><a href="#impl-Visitor%3C%27de%3E-for-IgnoredAny" class="anchor"></a><h3 class="code-header in-band">impl<'de> <a class="trait" href="trait.Visitor.html" title="trait serde::de::Visitor">Visitor</a><'de> for <a class="struct" href="struct.IgnoredAny.html" title="struct serde::de::IgnoredAny">IgnoredAny</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Value-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Value-1" class="anchor"></a><h4 class="code-header">type <a href="#associatedtype.Value" class="associatedtype">Value</a> = <a class="struct" href="struct.IgnoredAny.html" title="struct serde::de::IgnoredAny">IgnoredAny</a></h4></section></div></details></div><script type="text/javascript" src="../../implementors/serde/de/trait.Visitor.js" data-ignore-extern-crates="" async></script></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="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html> |