Function std::io::copy 1.0.0
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[src]
pub fn copy<R: ?Sized, W: ?Sized>(reader: &mut R, writer: &mut W) -> Result<u64> where
R: Read,
W: Write, Copies the entire contents of a reader into a writer.
This function will continuously read data from reader and then
write it into writer in a streaming fashion until reader
returns EOF.
On success, the total number of bytes that were copied from
reader to writer is returned.
Errors
This function will return an error immediately if any call to read or
write returns an error. All instances of ErrorKind::Interrupted are
handled by this function and the underlying operation is retried.
Examples
use std::io; let mut reader: &[u8] = b"hello"; let mut writer: Vec<u8> = vec![]; io::copy(&mut reader, &mut writer)?; assert_eq!(&b"hello"[..], &writer[..]);Run