[−][src]Trait futures_util::io::AsyncWriteExt
An extension trait which adds utility methods to AsyncWrite
types.
Provided methods
fn flush(&mut self) -> Flush<'_, Self>ⓘ where
Self: Unpin,
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]);
fn close(&mut self) -> Close<'_, Self>ⓘ where
Self: Unpin,
Self: Unpin,
Creates a future which will entirely close this AsyncWrite
.
fn write<'a>(&'a mut self, buf: &'a [u8]) -> Write<'a, Self>ⓘ where
Self: Unpin,
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.
fn write_vectored<'a>(
&'a mut self,
bufs: &'a [IoSlice<'a>]
) -> WriteVectored<'a, Self>ⓘNotable traits for WriteVectored<'_, W>
impl<W: AsyncWrite + ?Sized + Unpin, '_> Future for WriteVectored<'_, W> type Output = Result<usize>;
where
Self: Unpin,
&'a mut self,
bufs: &'a [IoSlice<'a>]
) -> WriteVectored<'a, Self>ⓘ
Notable traits for WriteVectored<'_, W>
impl<W: AsyncWrite + ?Sized + Unpin, '_> Future for WriteVectored<'_, W> type Output = Result<usize>;
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.
fn write_all<'a>(&'a mut self, buf: &'a [u8]) -> WriteAll<'a, Self>ⓘ where
Self: Unpin,
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]);
fn into_sink<Item: AsRef<[u8]>>(self) -> IntoSink<Self, Item> where
Self: Sized,
Self: Sized,
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]);