Struct handy_async::io::misc::Counter

pub struct Counter<T> { /* fields omitted */ }

Counter counts the number of read/write bytes issued to an underlying stream.

Examples

use std::io::{self, Write};
use handy_async::io::misc::Counter;

let mut writer = Counter::new(io::sink());
writer.write(b"Hello").unwrap();
writer.write(b"World!").unwrap();
assert_eq!(writer.written_size(), b"Hello".len() + b"World!".len());

Methods

impl<T> Counter<T>

fn new(inner: T) -> Self

Makes a new Counter which has the inner stream T.

fn inner_ref(&self) -> &T

Gets a reference to the underlying stream.

fn inner_mut(&mut self) -> &mut T

Gets a mutable reference to the underlying stream.

fn into_inner(self) -> T

Unwraps this Counter, returning the underlying stream.

fn written_size(&self) -> usize

Returns the total byte size written to the underlying stream.

fn read_size(&self) -> usize

Returns the total byte size read from the underlying stream.

impl Counter<Sink>

fn with_sink() -> Self

Equivalent to Counter::new(std::io::sink()).

Trait Implementations

impl<T: Read> Read for Counter<T>

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

unsafe fn initializer(&self) -> Initializer

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

Determines if this Reader can work with buffers of uninitialized memory.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

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

Read the exact number of bytes required to fill buf.

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

Creates a "by reference" adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an [Iterator] over its bytes.

fn chars(self) -> Chars<Self>

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

the semantics of a partial read/write of where errors happen is currently unclear and may change

Transforms this Read instance to an [Iterator] over [char]s.

fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adaptor which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

Creates an adaptor which will read at most limit bytes from it.

impl<T: Write> Write for Counter<T>

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

Write a buffer into this object, returning how many bytes were written.

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

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

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

Attempts to write an entire buffer into this write.

fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>

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

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

Creates a "by reference" adaptor for this instance of Write.