Struct bytes::buf::Reader

[+] Show declaration

pub struct Reader<B> { /* fields omitted */ }

[−] Expand description

A Buf adapter which implements io::Read for the inner value.

This struct is generally created by calling reader() on Buf. See documentation of reader() for more details.

Methods

impl<B: Buf> Reader<B>

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Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_ref(&self) -> &B

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Gets a reference to the underlying Buf.

It is inadvisable to directly read from the underlying Buf.

Examples

use bytes::Buf;
use std::io::{self, Cursor};

let mut buf = Cursor::new(b"hello world").reader();

assert_eq!(0, buf.get_ref().position());

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_mut(&mut self) -> &mut B

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Gets a mutable reference to the underlying Buf.

It is inadvisable to directly read from the underlying Buf.

Examples

use bytes::Buf;
use std::io::{self, Cursor};

let mut buf = Cursor::new(b"hello world").reader();
let mut dst = vec![];

buf.get_mut().set_position(2);
io::copy(&mut buf, &mut dst).unwrap();

assert_eq!(*dst, b"llo world"[..]);

pub fn into_inner(self) -> B

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Consumes this Reader, returning the underlying value.

Examples

use bytes::Buf;
use std::io::{self, Cursor};

let mut buf = Cursor::new(b"hello world").reader();
let mut dst = vec![];

io::copy(&mut buf, &mut dst).unwrap();

let buf = buf.into_inner();
assert_eq!(0, buf.remaining());

Trait Implementations

impl<B: Debug> Debug for Reader<B>

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

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Formats the value using the given formatter.

impl<B: Buf + Sized> Read for Reader<B>

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

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

unsafe fn initializer(&self) -> Initializer

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🔬 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>

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

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

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Read all bytes until EOF in this source, appending them to buf.

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

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Read the exact number of bytes required to fill buf.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

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

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

Important traits for Bytes<R>

impl<R> Iterator for Bytes<R> where
    R: Read,  type Item = Result<u8, Error>;

fn bytes(self) -> Bytes<Self>

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

Important traits for Chars<R>

impl<R> Iterator for Chars<R> where
    R: Read,  type Item = Result<char, CharsError>;

fn chars(self) -> Chars<Self>

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Deprecated since 1.27.0

: Use str::from_utf8 instead: https://doc.rust-lang.org/nightly/std/str/struct.Utf8Error.html#examples

🔬 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.

Important traits for Chain<T, U>

impl<T, U> Read for Chain<T, U> where
    T: Read,
    U: Read, 

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

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Creates an adaptor which will chain this stream with another.

Important traits for Take<T>

impl<T> Read for Take<T> where
    T: Read, 

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

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