Function futures_lite::io::copy
source · pub async fn copy<R, W>(reader: R, writer: W) -> Result<u64>where
R: AsyncRead,
W: AsyncWrite,
Expand description
Copies the entire contents of a reader into a writer.
This function will read data from reader
and write it into writer
in a streaming fashion
until reader
returns EOF.
On success, returns the total number of bytes copied.
§Examples
use futures_lite::io::{self, BufReader, BufWriter};
let input: &[u8] = b"hello";
let reader = BufReader::new(input);
let mut output = Vec::new();
let writer = BufWriter::new(&mut output);
io::copy(reader, writer).await?;