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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 = "#" > Visit< / 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_core/field.rs.html#266" > source< / a > · < button id = "toggle-all-docs" title = "collapse all docs" > [< span > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < code > pub trait Visit {
// Required method
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fn < a href = "#tymethod.record_debug" class = "fn" > record_debug< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & 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 > );
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// Provided methods
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fn < a href = "#method.record_f64" class = "fn" > record_f64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.f64.html" > f64< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_i64" class = "fn" > record_i64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.i64.html" > i64< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_u64" class = "fn" > record_u64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.u64.html" > u64< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_i128" class = "fn" > record_i128< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.i128.html" > i128< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_u128" class = "fn" > record_u128< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.u128.html" > u128< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_bool" class = "fn" > record_bool< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_str" class = "fn" > record_str< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.str.html" > str< / a > ) { ... }
< span class = "item-spacer" > < / span > fn < a href = "#method.record_error" class = "fn" > record_error< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & (dyn < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/error/trait.Error.html" title = "trait core::error::Error" > Error< / a > + 'static)) { ... }
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}< / code > < / pre > < details class = "toggle top-doc" open > < summary class = "hideme" > < span > Expand description< / span > < / summary > < div class = "docblock" > < p > Visits typed values.< / p >
< p > An instance of < code > Visit< / code > (“a visitor”) represents the logic necessary to
record field values of various types. When an implementor of < a href = "../../tracing_core/field/trait.Value.html" title = "trait tracing_core::field::Value" > < code > Value< / code > < / a > is
< a href = "../../tracing_core/field/trait.Value.html#tymethod.record" title = "method tracing_core::field::Value::record" > recorded< / a > , it calls the appropriate method on the provided visitor to
indicate the type that value should be recorded as.< / p >
< p > When a < a href = "../../tracing_core/subscriber/trait.Subscriber.html" title = "trait tracing_core::subscriber::Subscriber" > < code > Subscriber< / code > < / a > implementation < a href = "../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event" title = "method tracing_core::subscriber::Subscriber::event" > records an < code > Event< / code > < / a > or a
< a href = "../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record" title = "method tracing_core::subscriber::Subscriber::record" > set of < code > Value< / code > s added to a < code > Span< / code > < / a > , it can pass an < code > & mut Visit< / code > to the
< code > record< / code > method on the provided < a href = "../../tracing_core/field/struct.ValueSet.html" title = "struct tracing_core::field::ValueSet" > < code > ValueSet< / code > < / a > or < a href = "../../tracing_core/event/struct.Event.html" title = "struct tracing_core::event::Event" > < code > Event< / code > < / a > . This visitor
will then be used to record all the field-value pairs present on that
< code > Event< / code > or < code > ValueSet< / code > .< / p >
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< h2 id = "examples" > < a class = "doc-anchor" href = "#examples" > §< / a > Examples< / h2 >
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< p > A simple visitor that writes to a string might be implemented like so:< / p >
< div class = "example-wrap" > < pre class = "rust rust-example-rendered" > < code > < span class = "kw" > use < / span > std::fmt::{< span class = "self" > self< / span > , Write};
< span class = "kw" > use < / span > tracing::field::{Value, Visit, Field};
< span class = "kw" > pub struct < / span > StringVisitor< < span class = "lifetime" > 'a< / span > > {
string: < span class = "kw-2" > & < / span > < span class = "lifetime" > 'a < / span > < span class = "kw-2" > mut < / span > String,
}
< span class = "kw" > impl< / span > < < span class = "lifetime" > 'a< / span > > Visit < span class = "kw" > for < / span > StringVisitor< < span class = "lifetime" > 'a< / span > > {
< span class = "kw" > fn < / span > record_debug(< span class = "kw-2" > & mut < / span > < span class = "self" > self< / span > , field: < span class = "kw-2" > & < / span > Field, value: < span class = "kw-2" > & < / span > < span class = "kw" > dyn < / span > fmt::Debug) {
< span class = "macro" > write!< / span > (< span class = "self" > self< / span > .string, < span class = "string" > "{} = {:?}; "< / span > , field.name(), value).unwrap();
}
}< / code > < / pre > < / div >
< p > This visitor will format each recorded value using < code > fmt::Debug< / code > , and
append the field name and formatted value to the provided string,
regardless of the type of the recorded value. When all the values have
been recorded, the < code > StringVisitor< / code > may be dropped, allowing the string
to be printed or stored in some other data structure.< / p >
< p > The < code > Visit< / code > trait provides default implementations for < code > record_i64< / code > ,
< code > record_u64< / code > , < code > record_bool< / code > , < code > record_str< / code > , and < code > record_error< / code > , which simply
forward the recorded value to < code > record_debug< / code > . Thus, < code > record_debug< / code > is the
only method which a < code > Visit< / code > implementation < em > must< / em > implement. However,
visitors may override the default implementations of these functions in
order to implement type-specific behavior.< / p >
< p > Additionally, when a visitor receives a value of a type it does not care
about, it is free to ignore those values completely. For example, a
visitor which only records numeric data might look like this:< / p >
< div class = "example-wrap" > < pre class = "rust rust-example-rendered" > < code > < span class = "kw" > pub struct < / span > SumVisitor {
sum: i64,
}
< span class = "kw" > impl < / span > Visit < span class = "kw" > for < / span > SumVisitor {
< span class = "kw" > fn < / span > record_i64(< span class = "kw-2" > & mut < / span > < span class = "self" > self< / span > , _field: < span class = "kw-2" > & < / span > Field, value: i64) {
< span class = "self" > self< / span > .sum += value;
}
< span class = "kw" > fn < / span > record_u64(< span class = "kw-2" > & mut < / span > < span class = "self" > self< / span > , _field: < span class = "kw-2" > & < / span > Field, value: u64) {
< span class = "self" > self< / span > .sum += value < span class = "kw" > as < / span > i64;
}
< span class = "kw" > fn < / span > record_debug(< span class = "kw-2" > & mut < / span > < span class = "self" > self< / span > , _field: < span class = "kw-2" > & < / span > Field, _value: < span class = "kw-2" > & < / span > fmt::Debug) {
< span class = "comment" > // Do nothing
< / span > }
}< / code > < / pre > < / div >
< p > This visitor (which is probably not particularly useful) keeps a running
sum of all the numeric values it records, and ignores all other values. A
more practical example of recording typed values is presented in
< code > examples/counters.rs< / code > , which demonstrates a very simple metrics system
implemented using < code > tracing< / code > .< / p >
< div class = "example-wrap" style = "display:inline-block" >
< pre class = "ignore" style = "white-space:normal;font:inherit;" >
< strong > Note< / strong > : The < code > record_error< / code > trait method is only
available when the Rust standard library is present, as it requires the
< code > std::error::Error< / code > trait.
< / pre > < / div >
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< / div > < / details > < 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.record_debug" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#326" > source< / a > < h4 class = "code-header" > fn < a href = "#tymethod.record_debug" class = "fn" > record_debug< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & 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 > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a value implementing < code > fmt::Debug< / code > .< / p >
< / 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.record_f64" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#277" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_f64" class = "fn" > record_f64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.f64.html" > f64< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a double-precision floating point value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_i64" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#282" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_i64" class = "fn" > record_i64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.i64.html" > i64< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a signed 64-bit integer value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_u64" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#287" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_u64" class = "fn" > record_u64< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.u64.html" > u64< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit an unsigned 64-bit integer value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_i128" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#292" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_i128" class = "fn" > record_i128< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.i128.html" > i128< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a signed 128-bit integer value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_u128" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#297" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_u128" class = "fn" > record_u128< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.u128.html" > u128< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit an unsigned 128-bit integer value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_bool" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#302" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_bool" class = "fn" > record_bool< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.bool.html" > bool< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a boolean value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_str" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#307" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_str" class = "fn" > record_str< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & < a class = "primitive" href = "https://doc.rust-lang.org/1.78.0/std/primitive.str.html" > str< / a > )< / h4 > < / section > < / summary > < div class = "docblock" > < p > Visit a string value.< / p >
< / div > < / details > < details class = "toggle method-toggle" open > < summary > < section id = "method.record_error" class = "method" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#321" > source< / a > < h4 class = "code-header" > fn < a href = "#method.record_error" class = "fn" > record_error< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & (dyn < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/error/trait.Error.html" title = "trait core::error::Error" > Error< / a > + 'static))< / h4 > < / section > < / summary > < div class = "docblock" > < p > Records a type implementing < code > Error< / code > .< / p >
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< div class = "example-wrap" style = "display:inline-block" >
< pre class = "ignore" style = "white-space:normal;font:inherit;" >
< strong > Note< / strong > : This is only enabled when the Rust standard library is
present.
< / pre >
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< / div > < / div > < / details > < / div > < h2 id = "foreign-impls" class = "section-header" > Implementations on Foreign Types< a href = "#foreign-impls" class = "anchor" > §< / a > < / h2 > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-Visit-for-DebugMap%3C'a,+'b%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#391" > source< / a > < a href = "#impl-Visit-for-DebugMap%3C'a,+'b%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, 'b> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/fmt/builders/struct.DebugMap.html" title = "struct core::fmt::builders::DebugMap" > DebugMap< / a > < 'a, 'b> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.record_debug" class = "method trait-impl" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#392" > source< / a > < a href = "#method.record_debug" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.record_debug" class = "fn" > record_debug< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & 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 > )< / h4 > < / section > < / div > < / details > < details class = "toggle implementors-toggle" > < summary > < section id = "impl-Visit-for-DebugStruct%3C'a,+'b%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#385" > source< / a > < a href = "#impl-Visit-for-DebugStruct%3C'a,+'b%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a, 'b> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "https://doc.rust-lang.org/1.78.0/core/fmt/builders/struct.DebugStruct.html" title = "struct core::fmt::builders::DebugStruct" > DebugStruct< / a > < 'a, 'b> < / h3 > < / section > < / summary > < div class = "impl-items" > < section id = "method.record_debug-1" class = "method trait-impl" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#386" > source< / a > < a href = "#method.record_debug-1" class = "anchor" > §< / a > < h4 class = "code-header" > fn < a href = "#tymethod.record_debug" class = "fn" > record_debug< / a > (& mut self, field: & < a class = "struct" href = "../../tracing_core/field/struct.Field.html" title = "struct tracing_core::field::Field" > Field< / a > , value: & 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 > )< / h4 > < / section > < / div > < / details > < h2 id = "implementors" class = "section-header" > Implementors< a href = "#implementors" class = "anchor" > §< / a > < / h2 > < div id = "implementors-list" > < section id = "impl-Visit-for-DefaultVisitor%3C'a%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/mod.rs.html#1240-1299" > source< / a > < a href = "#impl-Visit-for-DefaultVisitor%3C'a%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "../fmt/format/struct.DefaultVisitor.html" title = "struct tracing_subscriber::fmt::format::DefaultVisitor" > DefaultVisitor< / a > < 'a> < / h3 > < / section > < section id = "impl-Visit-for-PrettyVisitor%3C'a%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/pretty.rs.html#440-498" > source< / a > < a href = "#impl-Visit-for-PrettyVisitor%3C'a%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< 'a> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "../fmt/format/struct.PrettyVisitor.html" title = "struct tracing_subscriber::fmt::format::PrettyVisitor" > PrettyVisitor< / a > < 'a> < / h3 > < / section > < section id = "impl-Visit-for-FieldFnVisitor%3C'a,+F%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/fmt/format/mod.rs.html#1540-1549" > source< / a > < a href = "#impl-Visit-for-FieldFnVisitor%3C'a,+F%3E
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 > ,< / div > < / h3 > < / section > < section id = "impl-Visit-for-VisitDelimited%3CD,+V%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/delimited.rs.html#83-112" > source< / a > < a href = "#impl-Visit-for-VisitDelimited%3CD,+V%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< D, V> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "delimited/struct.VisitDelimited.html" title = "struct tracing_subscriber::field::delimited::VisitDelimited" > VisitDelimited< / a > < D, V> < div class = "where" > where
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V: < a class = "trait" href = "trait.VisitFmt.html" title = "trait tracing_subscriber::field::VisitFmt" > VisitFmt< / a > ,
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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 > > ,< / div > < / h3 > < / section > < section id = "impl-Visit-for-F" class = "impl" > < a class = "src rightside" href = "../../src/tracing_core/field.rs.html#397-399" > source< / a > < a href = "#impl-Visit-for-F" class = "anchor" > §< / a > < h3 class = "code-header" > impl< F> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for F< div class = "where" > where
F: < a class = "trait" href = "https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnMut.html" title = "trait core::ops::function::FnMut" > FnMut< / 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 > ),< / div > < / h3 > < / section > < section id = "impl-Visit-for-Alt%3CV%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/debug.rs.html#37-75" > source< / a > < a href = "#impl-Visit-for-Alt%3CV%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< V> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > for < a class = "struct" href = "debug/struct.Alt.html" title = "struct tracing_subscriber::field::debug::Alt" > Alt< / a > < V> < div class = "where" > where
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V: < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > ,< / div > < / h3 > < / section > < section id = "impl-Visit-for-Messages%3CV%3E" class = "impl" > < a class = "src rightside" href = "../../src/tracing_subscriber/field/display.rs.html#39-81" > source< / a > < a href = "#impl-Visit-for-Messages%3CV%3E" class = "anchor" > §< / a > < h3 class = "code-header" > impl< V> < a class = "trait" href = "trait.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > 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.Visit.html" title = "trait tracing_subscriber::field::Visit" > Visit< / a > ,< / div > < / h3 > < / section > < / div > < script src = "../../trait.impl/tracing_core/field/trait.Visit.js" data-ignore-extern-crates = "core" async > < / script > < / section > < / div > < / main > < / body > < / html >
