Struct CountingWriter 

pub struct CountingWriter { /* private fields */ }

Counts bytes on their way out, so a caller can report bytes_out correctly even for a destination with no length — stdout, notably.

The write-side twin of Counting. Both live here so Phase 2’s containers, which need to account for bytes in both directions per entry, find one mechanism rather than re-inventing this one.

Implementations

impl CountingWriter

pub fn new(inner: Box<dyn Write + Send>) -> (Self, Arc<AtomicU64>)

Returns the wrapper and a handle to its running tally.

Trait Implementations

impl Write for CountingWriter

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.