Struct async_std::io::Chain

pub struct Chain<T, U> { /* private fields */ }

Adaptor to chain together two readers.

This struct is generally created by calling chain on a reader. Please see the documentation of chain for more details.

Implementations

impl<T, U> Chain<T, U>

pub fn into_inner(self) -> (T, U)

Consumes the Chain, returning the wrapped readers.

Examples

use async_std::prelude::*;
use async_std::fs::File;

let foo_file = File::open("foo.txt").await?;
let bar_file = File::open("bar.txt").await?;

let chain = foo_file.chain(bar_file);
let (foo_file, bar_file) = chain.into_inner();

pub fn get_ref(&self) -> (&T, &U)

Gets references to the underlying readers in this Chain.

Examples

use async_std::prelude::*;
use async_std::fs::File;

let foo_file = File::open("foo.txt").await?;
let bar_file = File::open("bar.txt").await?;

let chain = foo_file.chain(bar_file);
let (foo_file, bar_file) = chain.get_ref();

pub fn get_mut(&mut self) -> (&mut T, &mut U)

Gets mutable references to the underlying readers in this Chain.

Care should be taken to avoid modifying the internal I/O state of the underlying readers as doing so may corrupt the internal state of this Chain.

Examples

use async_std::prelude::*;
use async_std::fs::File;

let foo_file = File::open("foo.txt").await?;
let bar_file = File::open("bar.txt").await?;

let mut chain = foo_file.chain(bar_file);
let (foo_file, bar_file) = chain.get_mut();

Trait Implementations

impl<T: BufRead, U: BufRead> AsyncBufRead for Chain<T, U>

fn poll_fill_buf( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<&[u8]>>

Attempt to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

fn consume(self: Pin<&mut Self>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to poll_read.

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

fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8], ) -> Poll<Result<usize>>

Attempt to read from the AsyncRead into buf.

fn poll_read_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &mut [IoSliceMut<'_>], ) -> Poll<Result<usize>>

Attempt to read from the AsyncRead into bufs using vectored IO operations.

impl<T: Debug, U: Debug> Debug for Chain<T, U>

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

Formats the value using the given formatter.

impl<'__pin, T, U> Unpin for Chain<T, U>

where PinnedFieldsOf<__Origin<'__pin, T, U>>: Unpin,