[−][src]Struct log::Metadata
Metadata about a log message.
Use
Metadata
structs are created when users of the library use
logging macros.
They are consumed by implementations of the Log
trait in the
enabled
method.
Record
s use Metadata
to determine the log message's severity
and target.
Users should use the log_enabled!
macro in their code to avoid
constructing expensive log messages.
Examples
ⓘThis code runs with edition 2018
use log::{Record, Level, Metadata}; struct MyLogger; impl log::Log for MyLogger { fn enabled(&self, metadata: &Metadata) -> bool { metadata.level() <= Level::Info } fn log(&self, record: &Record) { if self.enabled(record.metadata()) { println!("{} - {}", record.level(), record.args()); } } fn flush(&self) {} }
Implementations
impl<'a> Metadata<'a>
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pub fn builder() -> MetadataBuilder<'a>
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Returns a new builder.
pub fn level(&self) -> Level
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The verbosity level of the message.
pub fn target(&self) -> &'a str
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The name of the target of the directive.
Trait Implementations
impl<'a> Clone for Metadata<'a>
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impl<'a> Debug for Metadata<'a>
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impl<'a> Eq for Metadata<'a>
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impl<'a> Hash for Metadata<'a>
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impl<'a> Ord for Metadata<'a>
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impl<'a> PartialEq<Metadata<'a>> for Metadata<'a>
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impl<'a> PartialOrd<Metadata<'a>> for Metadata<'a>
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impl<'a> StructuralEq for Metadata<'a>
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impl<'a> StructuralPartialEq for Metadata<'a>
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Auto Trait Implementations
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,