Trait tracing_subscriber::fmt::time::FormatTime

pub trait FormatTime {
    fn format_time(&self, w: &mut dyn Write) -> Result;
}

A type that can measure and format the current time.

This trait is used by Format to include a timestamp with each Event when it is logged.

Notable default implementations of this trait are SystemTime and (). The former prints the current time as reported by std::time::SystemTime, and the latter does not print the current time at all. FormatTime is also automatically implemented for any function pointer with the appropriate signature.

Required methods

fn format_time(&self, w: &mut dyn Write) -> Result

Measure and write out the current time.

When format_time is called, implementors should get the current time using their desired mechanism, and write it out to the given fmt::Write. Implementors must insert a trailing space themselves if they wish to separate the time from subsequent log message text.

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Implementations on Foreign Types

impl<'a, F> FormatTime for &'a F where
    F: FormatTime, 

fn format_time(&self, w: &mut dyn Write) -> Result

impl FormatTime for ()

fn format_time(&self, _: &mut dyn Write) -> Result

impl FormatTime for fn(_: &mut dyn Write) -> Result

fn format_time(&self, w: &mut dyn Write) -> Result

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Implementors

impl FormatTime for SystemTime

fn format_time(&self, w: &mut dyn Write) -> Result

impl FormatTime for Uptime

fn format_time(&self, w: &mut dyn Write) -> Result

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