Struct log::Metadata
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pub struct Metadata<'a> { /* fields omitted */ }
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
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) {} }
Methods
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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fn clone(&self) -> Metadata<'a>
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl<'a> Eq for Metadata<'a>
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impl<'a> PartialEq for Metadata<'a>
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fn eq(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests for !=
.
impl<'a> Ord for Metadata<'a>
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fn cmp(&self, __arg_0: &Metadata<'a>) -> Ordering
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This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self
1.21.0[src]
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self
1.21.0[src]
Compares and returns the minimum of two values. Read more
impl<'a> PartialOrd for Metadata<'a>
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fn partial_cmp(&self, __arg_0: &Metadata<'a>) -> Option<Ordering>
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This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, __arg_0: &Metadata<'a>) -> bool
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This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl<'a> Hash for Metadata<'a>
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fn hash<__H: Hasher>(&self, __arg_0: &mut __H)
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Feeds this value into the given [Hasher
]. Read more
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
1.3.0[src]
H: Hasher,
Feeds a slice of this type into the given [Hasher
]. Read more