Struct Prefixer 

pub struct Prefixer<'w> {
    pub first_line_prefix: String,
    pub next_line_prefix: String,
    pub writer: &'w mut dyn Write,
    pub is_first_line: bool,
    pub needs_prefix: bool,
}

A Write adapter that prefixes each written line.

This type uses a dyn Write instead of impl Write to avoid a trait-recursion explosion in crate::writeln_error_to_writer.

Fields

first_line_prefix: String

Prefix for the very first line.

next_line_prefix: String

Prefix for subsequent lines.

writer: &'w mut dyn Write

The underlying writer.

is_first_line: bool

Whether the next write is still on the first line.

needs_prefix: bool

Whether the next write should include a prefix.

Implementations

impl<'w> Prefixer<'w>

pub fn new( first_line_prefix: impl Into<String>, next_line_prefix: impl Into<String>, writer: &'w mut dyn Write, ) -> Self

Creates a new prefixing writer with the provided line prefixes.

Trait Implementations

impl<'w> Debug for Prefixer<'w>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'w> Write for Prefixer<'w>

fn write(&mut self, buf: &[u8]) -> Result<usize>

Writes a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Writer has an efficient write_vectored implementation.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

🔬This is a nightly-only experimental API. (write_all_vectored)

Attempts to write multiple buffers into this writer.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adapter for this instance of Write.