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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 = "This trait represents a visitor that walks through a deserializer." > < title > Visitor in serde::de - Rust< / title > < script > if ( window . location . protocol !== "file:" ) document . head . insertAdjacentHTML ( "beforeend" , "SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2" . split ( "," ) . map ( f => ` <link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/ ${ f } "> ` ) . join ( "" ) ) < / script > < link rel = "stylesheet" href = "../../static.files/normalize-76eba96aa4d2e634.css" > < link rel = "stylesheet" href = "../../static.files/rustdoc-dd39b87e5fcfba68.css" > < meta name = "rustdoc-vars" data-root-path = "../../" data-static-root-path = "../../static.files/" data-current-crate = "serde" data-themes = "" data-resource-suffix = "" data-rustdoc-version = "1.80.0 (051478957 2024-07-21)" data-channel = "1.80.0" data-search-js = "search-d52510db62a78183.js" data-settings-js = "settings-4313503d2e1961c2.js" > < script src = "../../static.files/storage-118b08c4c78b968e.js" > < / script > < script defer src = "sidebar-items.js" > < / script > < script defer src = "../../static.files/main-20a3ad099b048cf2.js" > < / script > < noscript > < link rel = "stylesheet" href = "../../static.files/noscript-df360f571f6edeae.css" > < / noscript > < link rel = "alternate icon" type = "image/png" href = "../../static.files/favicon-32x32-422f7d1d52889060.png" > < link rel = "icon" type = "image/svg+xml" href = "../../static.files/favicon-2c020d218678b618.svg" > < / head > < body class = "rustdoc trait" > <!-- [if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif] --> < nav class = "mobile-topbar" > < button class = "sidebar-menu-toggle" title = "show sidebar" > < / button > < / nav > < nav class = "sidebar" > < div class = "sidebar-crate" > < h2 > < a href = "../../serde/index.html" > serde< / a > < span class = "version" > 1.0.204< / span > < / h2 > < / div > < h2 class = "location" > < a href = "#" > Visitor< / a > < / h2 > < div class = "sidebar-elems" > < section > < h3 > < a href = "#required-associated-types" > Required Associated Types< / a > < / h3 > < ul class = "block" > < li > < a href = "#associatedtype.Value" > Value< / a > < / li > < / ul > < h3 > < a href = "#required-methods" > Required Methods< / a > < / h3 > < ul class = "block" > < li > < a href = "#tymethod.expecting" > expecting< / a > < / li > < / ul > < h3 > < a href = "#provided-methods" > Provided Methods< / a > < / h3 > < ul class = "block" > < 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 > < h3 > < a href = "#object-safety" > Object Safety< / a > < / h3 > < h3 > < a href
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type < a href = "#associatedtype.Value" class = "associatedtype" > Value< / a > ;
< details class = "toggle type-contents-toggle" > < summary class = "hideme" > < span > Show 28 methods< / span > < / summary > // Required method
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fn < a href = "#tymethod.expecting" class = "fn" > expecting< / a > (& self, formatter: & mut < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title = "struct core::fmt::Formatter" > Formatter< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title = "type core::fmt::Result" > Result< / a > ;
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// Provided methods
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fn < a href = "#method.visit_bool" class = "fn" > visit_bool< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.bool.html" > bool< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_i8" class = "fn" > visit_i8< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i8.html" > i8< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_i16" class = "fn" > visit_i16< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i16.html" > i16< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_i32" class = "fn" > visit_i32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i32.html" > i32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_i64" class = "fn" > visit_i64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i64.html" > i64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_i128" class = "fn" > visit_i128< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i128.html" > i128< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_u8" class = "fn" > visit_u8< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_u16" class = "fn" > visit_u16< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u16.html" > u16< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_u32" class = "fn" > visit_u32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u32.html" > u32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_u64" class = "fn" > visit_u64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u64.html" > u64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_u128" class = "fn" > visit_u128< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u128.html" > u128< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_f32" class = "fn" > visit_f32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.f32.html" > f32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_f64" class = "fn" > visit_f64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.f64.html" > f64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_char" class = "fn" > visit_char< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.char.html" > char< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_str" class = "fn" > visit_str< / a > < E> (self, v: & < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.str.html" > str< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_borrowed_str" class = "fn" > visit_borrowed_str< / a > < E> (self, v: & 'de < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.str.html" > str< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_string" class = "fn" > visit_string< / a > < E> (self, v: < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/alloc/string/struct.String.html" title = "struct alloc::string::String" > String< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_bytes" class = "fn" > visit_bytes< / a > < E> (self, v: & [< a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ]) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_borrowed_bytes" class = "fn" > visit_borrowed_bytes< / a > < E> (self, v: & 'de [< a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ]) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_byte_buf" class = "fn" > visit_byte_buf< / a > < E> (self, v: < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html" title = "struct alloc::vec::Vec" > Vec< / a > < < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_none" class = "fn" > visit_none< / a > < E> (self) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_some" class = "fn" > visit_some< / a > < D> (self, deserializer: D) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > >
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< span class = "where" > where D: < a class = "trait" href = "../trait.Deserializer.html" title = "trait serde::Deserializer" > Deserializer< / a > < 'de> < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_unit" class = "fn" > visit_unit< / a > < E> (self) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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>
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< span class = "where" > where E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > < / span > { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.visit_newtype_struct" class = "fn" > visit_newtype_struct< / a > < D> (
self,
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deserializer: D,
) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > >
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< span class = "where" > where D: < a class = "trait" href = "../trait.Deserializer.html" title = "trait serde::Deserializer" > Deserializer< / a > < 'de> < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_seq" class = "fn" > visit_seq< / a > < A> (self, seq: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > >
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< span class = "where" > where A: < a class = "trait" href = "trait.SeqAccess.html" title = "trait serde::de::SeqAccess" > SeqAccess< / a > < 'de> < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_map" class = "fn" > visit_map< / a > < A> (self, map: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > >
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< span class = "where" > where A: < a class = "trait" href = "trait.MapAccess.html" title = "trait serde::de::MapAccess" > MapAccess< / a > < 'de> < / span > { ... }
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< span class = "item-spacer" > < / span > fn < a href = "#method.visit_enum" class = "fn" > visit_enum< / a > < A> (self, data: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > >
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< span class = "where" > where A: < a class = "trait" href = "trait.EnumAccess.html" title = "trait serde::de::EnumAccess" > EnumAccess< / a > < 'de> < / span > { ... }
< / details > }< / code > < / pre > < details class = "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 >
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< h2 id = "lifetime" > < a class = "doc-anchor" href = "#lifetime" > §< / a > Lifetime< / h2 >
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< 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 >
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< h2 id = "example" > < a class = "doc-anchor" href = "#example" > §< / a > Example< / h2 >
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< div class = "example-wrap edition" > < a href = "#" class = "tooltip" title = "This example runs with edition 2021" > ⓘ< / a > < pre class = "rust rust-example-rendered" > < code > < span class = "doccomment" > /// A visitor that deserializes a long string - a string containing at least
/// some minimum number of bytes.
< / span > < span class = "kw" > struct < / span > LongString {
min: usize,
}
< span class = "kw" > impl< / span > < < span class = "lifetime" > 'de< / span > > Visitor< < span class = "lifetime" > 'de< / span > > < span class = "kw" > for < / span > LongString {
< span class = "kw" > type < / span > Value = String;
< span class = "kw" > fn < / span > expecting(< span class = "kw-2" > & < / span > < span class = "self" > self< / span > , formatter: < span class = "kw-2" > & mut < / span > fmt::Formatter) -> fmt::Result {
< span class = "macro" > write!< / span > (formatter, < span class = "string" > "a string containing at least {} bytes"< / span > , < span class = "self" > self< / span > .min)
}
< span class = "kw" > fn < / span > visit_str< E> (< span class = "self" > self< / span > , s: < span class = "kw-2" > & < / span > str) -> < span class = "prelude-ty" > Result< / span > < < span class = "self" > Self< / span > ::Value, E>
< span class = "kw" > where
< / span > E: de::Error,
{
< span class = "kw" > if < / span > s.len() > = < span class = "self" > self< / span > .min {
< span class = "prelude-val" > Ok< / span > (s.to_owned())
} < span class = "kw" > else < / span > {
< span class = "prelude-val" > Err< / span > (de::Error::invalid_value(Unexpected::Str(s), < span class = "kw-2" > & < / span > < span class = "self" > self< / span > ))
}
}
}< / code > < / pre > < / div >
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< / div > < / details > < h2 id = "required-associated-types" class = "section-header" > Required Associated Types< a href = "#required-associated-types" class = "anchor" > §< / a > < / h2 > < div class = "methods" > < details class = "toggle" open > < summary > < section id = "associatedtype.Value" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1287" > source< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Value" class = "associatedtype" > Value< / a > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The value produced by this visitor.< / p >
< / div > < / details > < / div > < h2 id = "required-methods" class = "section-header" > Required Methods< a href = "#required-methods" class = "anchor" > §< / a > < / h2 > < div class = "methods" > < details class = "toggle method-toggle" open > < summary > < section id = "tymethod.expecting" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1311" > source< / a > < h4 class = "code-header" > fn < a href = "#tymethod.expecting" class = "fn" > expecting< / a > (& self, formatter: & mut < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title = "struct core::fmt::Formatter" > Formatter< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title = "type core::fmt::Result" > Result< / a > < / h4 > < / section > < / summary > < div class = "docblock" > < p > Format a message stating what data this Visitor expects to receive.< / p >
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< 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 = "example-wrap edition" > < a href = "#" class = "tooltip" title = "This example runs with edition 2021" > ⓘ< / a > < pre class = "rust rust-example-rendered" > < code > < span class = "kw" > fn < / span > expecting(< span class = "kw-2" > & < / span > < span class = "self" > self< / span > , formatter: < span class = "kw-2" > & mut < / span > fmt::Formatter) -> fmt::Result {
< span class = "macro" > write!< / span > (formatter, < span class = "string" > "an integer between 0 and {}"< / span > , < span class = "self" > self< / span > .max)
}< / code > < / pre > < / div >
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< / div > < / details > < / div > < h2 id = "provided-methods" class = "section-header" > Provided Methods< a href = "#provided-methods" class = "anchor" > §< / a > < / h2 > < div class = "methods" > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_bool" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1316-1321" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_bool" class = "fn" > visit_bool< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.bool.html" > bool< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a boolean.< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_i8" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1328-1333" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_i8" class = "fn" > visit_i8< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i8.html" > i8< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_i16" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1340-1345" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_i16" class = "fn" > visit_i16< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i16.html" > i16< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_i32" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1352-1357" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_i32" class = "fn" > visit_i32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i32.html" > i32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_i64" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1362-1367" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_i64" class = "fn" > visit_i64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i64.html" > i64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains an < code > i64< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_i128" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1372-1383" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_i128" class = "fn" > visit_i128< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.i128.html" > i128< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a < code > i128< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_u8" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1390-1395" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_u8" class = "fn" > visit_u8< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_u16" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1402-1407" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_u16" class = "fn" > visit_u16< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u16.html" > u16< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_u32" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1414-1419" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_u32" class = "fn" > visit_u32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u32.html" > u32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_u64" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1424-1429" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_u64" class = "fn" > visit_u64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u64.html" > u64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a < code > u64< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_u128" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1434-1445" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_u128" class = "fn" > visit_u128< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u128.html" > u128< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a < code > u128< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_f32" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1452-1457" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_f32" class = "fn" > visit_f32< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.f32.html" > f32< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_f64" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1462-1467" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_f64" class = "fn" > visit_f64< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.f64.html" > f64< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains an < code > f64< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_char" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1476-1481" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_char" class = "fn" > visit_char< / a > < E> (self, v: < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.char.html" > char< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_str" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1494-1499" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_str" class = "fn" > visit_str< / a > < E> (self, v: & < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.str.html" > str< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_borrowed_str" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1511-1516" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_borrowed_str" class = "fn" > visit_borrowed_str< / a > < E> (self, v: & 'de < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.str.html" > str< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_string" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1536-1541" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_string" class = "fn" > visit_string< / a > < E> (self, v: < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/alloc/string/struct.String.html" title = "struct alloc::string::String" > String< / a > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_bytes" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1554-1559" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_bytes" class = "fn" > visit_bytes< / a > < E> (self, v: & [< a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ]) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_borrowed_bytes" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1570-1575" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_borrowed_bytes" class = "fn" > visit_borrowed_bytes< / a > < E> (self, v: & 'de [< a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > ]) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_byte_buf" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1595-1600" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_byte_buf" class = "fn" > visit_byte_buf< / a > < E> (self, v: < a class = "struct" href = "https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html" title = "struct alloc::vec::Vec" > Vec< / a > < < a class = "primitive" href = "https://doc.rust-lang.org/1.80.0/std/primitive.u8.html" > u8< / a > > ) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_none" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1605-1610" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_none" class = "fn" > visit_none< / a > < E> (self) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains an optional that is absent.< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_some" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1615-1621" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_some" class = "fn" > visit_some< / a > < D> (self, deserializer: D) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > > < div class = "where" > where
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D: < a class = "trait" href = "../trait.Deserializer.html" title = "trait serde::Deserializer" > Deserializer< / a > < 'de> ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains an optional that is present.< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_unit" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1626-1631" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_unit" class = "fn" > visit_unit< / a > < E> (self) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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> < div class = "where" > where
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E: < a class = "trait" href = "trait.Error.html" title = "trait serde::de::Error" > Error< / a > ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a unit < code > ()< / code > .< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_newtype_struct" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1639-1645" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_newtype_struct" class = "fn" > visit_newtype_struct< / a > < D> (
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self,
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deserializer: D,
) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > > < div class = "where" > where
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D: < a class = "trait" href = "../trait.Deserializer.html" title = "trait serde::Deserializer" > Deserializer< / a > < 'de> ,< / div > < / h4 > < / section > < / 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 >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_seq" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1650-1656" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_seq" class = "fn" > visit_seq< / a > < A> (self, seq: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > > < div class = "where" > where
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A: < a class = "trait" href = "trait.SeqAccess.html" title = "trait serde::de::SeqAccess" > SeqAccess< / a > < 'de> ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a sequence of elements.< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_map" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1661-1667" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_map" class = "fn" > visit_map< / a > < A> (self, map: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > > < div class = "where" > where
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A: < a class = "trait" href = "trait.MapAccess.html" title = "trait serde::de::MapAccess" > MapAccess< / a > < 'de> ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains a key-value map.< / p >
< p > The default implementation fails with a type error.< / p >
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< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.visit_enum" class = "method" > < a class = "src rightside" href = "../../src/serde/de/mod.rs.html#1672-1678" > source< / a > < h4 class = "code-header" > fn < a href = "#method.visit_enum" class = "fn" > visit_enum< / a > < A> (self, data: A) -> < a class = "enum" href = "https://doc.rust-lang.org/1.80.0/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 > > < div class = "where" > where
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A: < a class = "trait" href = "trait.EnumAccess.html" title = "trait serde::de::EnumAccess" > EnumAccess< / a > < 'de> ,< / div > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The input contains an enum.< / p >
< p > The default implementation fails with a type error.< / p >
2024-07-26 09:42:18 +00:00
< / div > < / details > < / div > < h2 id = "object-safety" class = "section-header" > Object Safety< a href = "#object-safety" class = "anchor" > §< / a > < / h2 > < div class = "object-safety-info" > This trait is < b > not< / b > < a href = "https://doc.rust-lang.org/1.80.0/reference/items/traits.html#object-safety" > object safe< / a > .< / div > < h2 id = "implementors" class = "section-header" > Implementors< a href = "#implementors" class = "anchor" > §< / a > < / h2 > < div id = "implementors-list" > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-Visitor%3C'de%3E-for-IgnoredAny" class = "impl" > < a class = "src rightside" href = "../../src/serde/de/ignored_any.rs.html#113-228" > source< / a > < a href = "#impl-Visitor%3C'de%3E-for-IgnoredAny" class = "anchor" > §< / a > < h3 class = "code-header" > 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" > < 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 src = "../../trait.impl/serde/de/trait.Visitor.js" async > < / script > < / section > < / div > < / main > < / body > < / html >
