Struct WriteCounter

pub struct WriteCounter<'a, T: 'a + Write> { /* private fields */ }

Wraps any implementation of std::io::Write and counts the bytes written.

A WriteCounter instance wraps any implementation of std::io::Read. Since WriteCounter also implements std::io::Write you can use it in place of the other implementation. The WriteCounter will count the number of bytes written.

Trait Implementations

impl<'a, T: 'a + Write> Counter for WriteCounter<'a, T>

fn count(&self) -> usize

Returns the number of bytes written so far.

impl<'a, T: 'a + Write> From<&'a mut T> for WriteCounter<'a, T>

fn from(value: &'a mut T) -> WriteCounter<'a, T>

Creates a WriteCounter by wrapping any implementation of std::io::Write.

The lifetime of this instance cannot be greater than the lifetime of the wrapped instance.

impl<'a, T: 'a + Write> Write for WriteCounter<'a, T>

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

Proxies to the inner write function, counting the bytes written along the way.

Panics

1. When the underlying function panics.
2. If more than usize::max_value() bytes are written across all calls to write.

Errors

This function will error only if the underlying function errors.

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

Proxies to the inner flush function.

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.