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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 = "Creates new visitors." > < title > MakeVisitor in tracing_subscriber::field - Rust< / title > < script > if ( window . location . protocol !== "file:" ) document . write ( ` <link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"> ` ) < / script > < link rel = "stylesheet" href = "../../static.files/normalize-76eba96aa4d2e634.css" > < link rel = "stylesheet" href = "../../static.files/rustdoc-e935ef01ae1c1829.css" > < meta name = "rustdoc-vars" data-root-path = "../../" data-static-root-path = "../../static.files/" data-current-crate = "tracing_subscriber" data-themes = "" data-resource-suffix = "" data-rustdoc-version = "1.78.0 (9b00956e5 2024-04-29)" data-channel = "1.78.0" data-search-js = "search-42d8da7a6b9792c2.js" data-settings-js = "settings-4313503d2e1961c2.js" > < script src = "../../static.files/storage-4c98445ec4002617.js" > < / script > < script defer src = "sidebar-items.js" > < / script > < script defer src = "../../static.files/main-12cf3b4f4f9dc36d.js" > < / script > < noscript > < link rel = "stylesheet" href = "../../static.files/noscript-04d5337699b92874.css" > < / noscript > < link rel = "alternate icon" type = "image/png" href = "../../static.files/favicon-16x16-8b506e7a72182f1c.png" > < 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 > < a class = "logo-container" href = "../../tracing_subscriber/index.html" > < img src = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt = "" > < / a > < / nav > < nav class = "sidebar" > < div class = "sidebar-crate" > < a class = "logo-container" href = "../../tracing_subscriber/index.html" > < img src = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt = "logo" > < / a > < h2 > < a href = "../../tracing_subscriber/index.html" > tracing_subscriber< / a > < span class = "version" > 0.3.18< / span > < / h2 > < / div > < h2 class = "location" > < a href = "#" > MakeVisitor< / 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.Visitor" > Visitor< / a > < / li > < / ul > < h3 > < a href = "#required-methods" > Required Methods< / a > < / h3 > < ul class = "block" > < li > < a href = "#tymethod.make_visitor" > make_visitor< / a > < / li > < / ul > < h3 > < a href = "#implementors" > Implementors< / a > < / h3 > < / section > < h2 > < a href = "index.html" > In tracing_subscriber::field< / a > < / h2 > < / div > < / nav > < div class = "sidebar-resizer" > < / div >
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< main > < div class = "width-limiter" > < nav class = "sub" > < form class = "search-form" > < span > < / span > < div id = "sidebar-button" tabindex = "-1" > < a href = "../../tracing_subscriber/all.html" title = "show sidebar" > < / a > < / div > < input class = "search-input" name = "search" aria-label = "Run search in the documentation" autocomplete = "off" spellcheck = "false" placeholder = "Click or press ‘ ’ ‘ ’ type = "search" > < div id = "help-button" tabindex = "-1" > < a href = "../../help.html" title = "help" > ?< / a > < / div > < div id = "settings-menu" tabindex = "-1" > < a href = "../../settings.html" title = "settings" > < img width = "22" height = "22" alt = "Change settings" src = "../../static.files/wheel-7b819b6101059cd0.svg" > < / a > < / div > < / form > < / nav > < section id = "main-content" class = "content" > < div class = "main-heading" > < h1 > Trait < a href = "../index.html" > tracing_subscriber< / a > ::< wbr > < a href = "index.html" > field< / a > ::< wbr > < a class = "trait" href = "#" > MakeVisitor< / a > < button id = "copy-path" title = "Copy item path to clipboard" > < img src = "../../static.files/clipboard-7571035ce49a181d.svg" width = "19" height = "18" alt = "Copy item path" > < / button > < / h1 > < span class = "out-of-band" > < a class = "src" href = "../../src/tracing_subscriber/field/mod.rs.html#26-32" > source< / a > · < button id = "toggle-all-docs" title = "collapse all docs" > [< span > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < code > pub trait MakeVisitor< T> {
type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > : < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > ;
// Required method
fn < a href = "#tymethod.make_visitor" class = "fn" > make_visitor< / a > (& self, target: T) -> Self::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > ;
}< / code > < / pre > < details class = "toggle top-doc" open > < summary class = "hideme" > < span > Expand description< / span > < / summary > < div class = "docblock" > < p > Creates new < a href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > visitors< / a > .< / p >
< p > A type implementing < code > MakeVisitor< / code > represents a composable factory for types
implementing the < a href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > < code > Visit< / code > trait< / a > . The < code > MakeVisitor< / code > trait defines
a single function, < code > make_visitor< / code > , which takes in a < code > T< / code > -typed < code > target< / code > and
returns a type implementing < code > Visit< / code > configured for that target. A target may
be a string, output stream, or data structure that the visitor will record
data to, configuration variables that determine the visitor’
< code > ()< / code > when no input is required to produce a visitor.< / p >
< / 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.Visitor" class = "method" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/mod.rs.html#28" > source< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > : < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > < / h4 > < / section > < / summary > < div class = "docblock" > < p > The visitor type produced by this < code > MakeVisitor< / code > .< / 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.make_visitor" class = "method" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/mod.rs.html#31" > source< / a > < h4 class = "code-header" > fn < a href = "#tymethod.make_visitor" class = "fn" > make_visitor< / a > (& self, target: T) -> Self::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > < / h4 > < / section > < / summary > < div class = "docblock" > < p > Make a new visitor for the provided < code > target< / code > .< / p >
< / div > < / details > < / 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-MakeVisitor%3CWriter%3C'a%3E%3E-for-DefaultFields" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/mod.rs.html#1205-1212" > source< / a > < a href = "#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-DefaultFields" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < < a class = "struct" href = "../fmt/format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < 'a> > for < a class = "struct" href = "../fmt/format/struct.DefaultFields.html" title = "struct tracing_subscriber::fmt::format::DefaultFields" > DefaultFields< / a > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-1" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-1" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "../fmt/format/struct.DefaultVisitor.html" title = "struct tracing_subscriber::fmt::format::DefaultVisitor" > DefaultVisitor< / a > < 'a> < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-PrettyFields" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/pretty.rs.html#387-397" > source< / a > < a href = "#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-PrettyFields" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < < a class = "struct" href = "../fmt/format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < 'a> > for < a class = "struct" href = "../fmt/format/struct.PrettyFields.html" title = "struct tracing_subscriber::fmt::format::PrettyFields" > PrettyFields< / a > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-2" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-2" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "../fmt/format/struct.PrettyVisitor.html" title = "struct tracing_subscriber::fmt::format::PrettyVisitor" > PrettyVisitor< / a > < 'a> < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/mod.rs.html#1525-1538" > source< / a > < a href = "#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, F> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < < a class = "struct" href = "../fmt/format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < 'a> > for < a class = "struct" href = "../fmt/format/struct.FieldFn.html" title = "struct tracing_subscriber::fmt::format::FieldFn" > FieldFn< / a > < F> < div class = "where" > where
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F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.Fn.html" title = "trait core::ops::function::Fn" > Fn< / a > (& mut < a class = "struct" href = "../fmt/format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < 'a> , & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , & dyn < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html" title = "trait core::fmt::Debug" > Debug< / a > ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/core/fmt/type.Result.html" title = "type core::fmt::Result" > Result< / a > + < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title = "trait core::clone::Clone" > Clone< / a > ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-3" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-3" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "../fmt/format/struct.FieldFnVisitor.html" title = "struct tracing_subscriber::fmt::format::FieldFnVisitor" > FieldFnVisitor< / a > < 'a, F> < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CT%3E-for-Delimited%3CD,+V%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/delimited.rs.html#27-38" > source< / a > < a href = "#impl-MakeVisitor%3CT%3E-for-Delimited%3CD,+V%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< D, V, T> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> for < a class = "struct" href = "delimited/struct.Delimited.html" title = "struct tracing_subscriber::field::delimited::Delimited" > Delimited< / a > < D, V> < div class = "where" > where
D: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/convert/trait.AsRef.html" title = "trait core::convert::AsRef" > AsRef< / a > < < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.str.html" > str< / a > > + < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/clone/trait.Clone.html" title = "trait core::clone::Clone" > Clone< / a > ,
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V: < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> ,
V::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > : < a class = "trait" href = "trait.VisitFmt.html" title = "trait tracing_subscriber::field::VisitFmt" > VisitFmt< / a > ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-4" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-4" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "delimited/struct.VisitDelimited.html" title = "struct tracing_subscriber::field::delimited::VisitDelimited" > VisitDelimited< / a > < D, < V as < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> > ::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CT%3E-for-Alt%3CV%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/debug.rs.html#25-35" > source< / a > < a href = "#impl-MakeVisitor%3CT%3E-for-Alt%3CV%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< T, V> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> for < a class = "struct" href = "debug/struct.Alt.html" title = "struct tracing_subscriber::field::debug::Alt" > Alt< / a > < V> < div class = "where" > where
V: < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-5" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-5" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "debug/struct.Alt.html" title = "struct tracing_subscriber::field::debug::Alt" > Alt< / a > < < V as < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> > ::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CT%3E-for-Messages%3CV%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/display.rs.html#27-37" > source< / a > < a href = "#impl-MakeVisitor%3CT%3E-for-Messages%3CV%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< T, V> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> for < a class = "struct" href = "display/struct.Messages.html" title = "struct tracing_subscriber::field::display::Messages" > Messages< / a > < V> < div class = "where" > where
V: < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-6" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-6" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = < a class = "struct" href = "display/struct.Messages.html" title = "struct tracing_subscriber::field::display::Messages" > Messages< / a > < < V as < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> > ::< a class = "associatedtype" href = "trait.MakeVisitor.html#associatedtype.Visitor" title = "type tracing_subscriber::field::MakeVisitor::Visitor" > Visitor< / a > > < / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-MakeVisitor%3CT%3E-for-F" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/mod.rs.html#193-202" > source< / a > < a href = "#impl-MakeVisitor%3CT%3E-for-F" class = "anchor" > §< / a > < h3 class = "code-header" > impl< T, V, F> < a class = "trait" href = "trait.MakeVisitor.html" title = "trait tracing_subscriber::field::MakeVisitor" > MakeVisitor< / a > < T> for F< div class = "where" > where
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F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.Fn.html" title = "trait core::ops::function::Fn" > Fn< / a > (T) -> V,
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V: < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > ,< / div > < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "associatedtype.Visitor-7" class = "associatedtype trait-impl" > < a href = "#associatedtype.Visitor-7" class = "anchor" > §< / a > < h4 class = "code-header" > type < a href = "#associatedtype.Visitor" class = "associatedtype" > Visitor< / a > = V< / h4 > < / section > < / div > < / details > < / div > < script src = "../../trait.impl/tracing_subscriber/field/trait.MakeVisitor.js" async > < / script > < / section > < / div > < / main > < / body > < / html >
