Struct env_logger::fmt::Formatter
source · [−]pub struct Formatter { /* private fields */ }
Expand description
A formatter to write logs into.
Formatter
implements the standard Write
trait for writing log records.
It also supports terminal colors, through the style
method.
Examples
Use the writeln
macro to format a log record.
An instance of a Formatter
is passed to an env_logger
format as buf
:
use std::io::Write;
let mut builder = env_logger::Builder::new();
builder.format(|buf, record| writeln!(buf, "{}: {}", record.level(), record.args()));
Trait Implementations
sourceimpl Write for Formatter
impl Write for Formatter
sourcefn write(&mut self, buf: &[u8]) -> Result<usize>
fn write(&mut self, buf: &[u8]) -> Result<usize>
Write a buffer into this writer, returning how many bytes were written. Read more
sourcefn flush(&mut self) -> Result<()>
fn flush(&mut self) -> Result<()>
Flush this output stream, ensuring that all intermediately buffered
contents reach their destination. Read more
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>
fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>
fn is_write_vectored(&self) -> bool
fn is_write_vectored(&self) -> bool
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
Attempts to write an entire buffer into this writer. Read more
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
Attempts to write multiple buffers into this writer. Read more
Auto Trait Implementations
impl !RefUnwindSafe for Formatter
impl !Send for Formatter
impl !Sync for Formatter
impl Unpin for Formatter
impl !UnwindSafe for Formatter
Blanket Implementations
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstablefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more