Trait futures::io::AsyncWriteExt

pub trait AsyncWriteExt: AsyncWrite {
    pub fn flush(&mut self) -> Flush<'_, Self>
    where
        Self: Unpin,
    { ... }
    pub fn close(&mut self) -> Close<'_, Self>
    where
        Self: Unpin,
    { ... }
    pub fn write(&'a mut self, buf: &'a [u8]) -> Write<'a, Self>
    where
        Self: Unpin,
    { ... }
    pub fn write_vectored(
        &'a mut self, 
        bufs: &'a [IoSlice<'a>]
    ) -> WriteVectored<'a, Self>
    where
        Self: Unpin,
    { ... }
    pub fn write_all(&'a mut self, buf: &'a [u8]) -> WriteAll<'a, Self>
    where
        Self: Unpin,
    { ... }
    pub fn into_sink<Item>(self) -> IntoSink<Self, Item>
    where
        Item: AsRef<[u8]>,
    { ... }
}

An extension trait which adds utility methods to AsyncWrite types.

Provided methods

pub fn flush(&mut self) -> Flush<'_, Self> where
    Self: Unpin, 

Creates a future which will entirely flush this AsyncWrite.

Examples

use futures::io::{AllowStdIo, AsyncWriteExt};
use std::io::{BufWriter, Cursor};

let mut output = vec![0u8; 5];

{
    let writer = Cursor::new(&mut output);
    let mut buffered = AllowStdIo::new(BufWriter::new(writer));
    buffered.write_all(&[1, 2]).await?;
    buffered.write_all(&[3, 4]).await?;
    buffered.flush().await?;
}

assert_eq!(output, [1, 2, 3, 4, 0]);

pub fn close(&mut self) -> Close<'_, Self> where
    Self: Unpin, 

Creates a future which will entirely close this AsyncWrite.

pub fn write(&'a mut self, buf: &'a [u8]) -> Write<'a, Self> where
    Self: Unpin, 

Creates a future which will write bytes from buf into the object.

The returned future will resolve to the number of bytes written once the write operation is completed.

pub fn write_vectored(
    &'a mut self,
    bufs: &'a [IoSlice<'a>]
) -> WriteVectored<'a, Self> where
    Self: Unpin, 

Creates a future which will write bytes from bufs into the object using vectored IO operations.

The returned future will resolve to the number of bytes written once the write operation is completed.

pub fn write_all(&'a mut self, buf: &'a [u8]) -> WriteAll<'a, Self> where
    Self: Unpin, 

Write data into this object.

Creates a future that will write the entire contents of the buffer buf into this AsyncWrite.

The returned future will not complete until all the data has been written.

Examples

use futures::io::{AsyncWriteExt, Cursor};

let mut writer = Cursor::new(vec![0u8; 5]);

writer.write_all(&[1, 2, 3, 4]).await?;

assert_eq!(writer.into_inner(), [1, 2, 3, 4, 0]);

pub fn into_sink<Item>(self) -> IntoSink<Self, Item> where
    Item: AsRef<[u8]>, 

Allow using an AsyncWrite as a Sink<Item: AsRef<[u8]>>.

This adapter produces a sink that will write each value passed to it into the underlying writer.

Note that this function consumes the given writer, returning a wrapped version.

Examples

use futures::io::AsyncWriteExt;
use futures::stream::{self, StreamExt};

let stream = stream::iter(vec![Ok([1, 2, 3]), Ok([4, 5, 6])]);

let mut writer = vec![];

stream.forward((&mut writer).into_sink()).await?;

assert_eq!(writer, vec![1, 2, 3, 4, 5, 6]);

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Implementors

impl<W> AsyncWriteExt for W where
    W: AsyncWrite + ?Sized, 

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