Trait futures::io::AsyncWriteExt

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

An extension trait which adds utility methods to AsyncWrite types.

Provided Methods§

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

Creates a future which will entirely close this AsyncWrite.

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fn write<'a>(&'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.

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fn write_vectored<'a>( &'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.

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fn write_all<'a>(&'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]);
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fn into_sink<Item>(self) -> IntoSink<Self, Item>where Item: AsRef<[u8]>, 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]);

Implementors§

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