Struct log::Metadata [] [src]

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.

Records 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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Returns a new builder.

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The verbosity level of the message.

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The name of the target of the directive.

Trait Implementations

impl<'a> Clone for Metadata<'a>
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Returns a copy of the value. Read more

1.0.0
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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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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl<'a> Ord for Metadata<'a>
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This method returns an Ordering between self and other. Read more

1.21.0
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Compares and returns the maximum of two values. Read more

1.21.0
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Compares and returns the minimum of two values. Read more

impl<'a> PartialOrd for Metadata<'a>
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This method returns an ordering between self and other values if one exists. Read more

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This method tests less than (for self and other) and is used by the < operator. Read more

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This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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This method tests greater than (for self and other) and is used by the > operator. Read more

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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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Feeds this value into the given [Hasher]. Read more

1.3.0
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Feeds a slice of this type into the given [Hasher]. Read more

impl<'a> Debug for Metadata<'a>
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Formats the value using the given formatter. Read more