pub struct Metadata<'a> { /* private fields */ }
Expand description
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) {}
}
Implementations§
Trait Implementations§
Source§impl<'a> Ord for Metadata<'a>
impl<'a> Ord for Metadata<'a>
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
Source§impl<'a> PartialOrd for Metadata<'a>
impl<'a> PartialOrd for Metadata<'a>
impl<'a> Eq for Metadata<'a>
impl<'a> StructuralPartialEq for Metadata<'a>
Auto Trait Implementations§
impl<'a> Freeze for Metadata<'a>
impl<'a> RefUnwindSafe for Metadata<'a>
impl<'a> Send for Metadata<'a>
impl<'a> Sync for Metadata<'a>
impl<'a> Unpin for Metadata<'a>
impl<'a> UnwindSafe for Metadata<'a>
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more