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std: Allow ?Sized parameters in std::io::copy #27531

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Aug 10, 2015
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std: Allow ?Sized parameters in std::io::copy #27531

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16 changes: 14 additions & 2 deletions src/libstd/io/util.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,9 @@ use io::{self, Read, Write, ErrorKind, BufRead};
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn copy<R: Read, W: Write>(reader: &mut R, writer: &mut W) -> io::Result<u64> {
pub fn copy<R: ?Sized, W: ?Sized>(reader: &mut R, writer: &mut W) -> io::Result<u64>
where R: Read, W: Write
{
let mut buf = [0; super::DEFAULT_BUF_SIZE];
let mut written = 0;
loop {
Expand Down Expand Up @@ -153,7 +155,17 @@ mod tests {
use prelude::v1::*;

use io::prelude::*;
use io::{sink, empty, repeat};
use io::{copy, sink, empty, repeat};

#[test]
fn copy_copies() {
let mut r = repeat(0).take(4);
let mut w = sink();
assert_eq!(copy(&mut r, &mut w).unwrap(), 4);

let mut r = repeat(0).take(1 << 17);
assert_eq!(copy(&mut r as &mut Read, &mut w as &mut Write).unwrap(), 1 << 17);
}

#[test]
fn sink_sinks() {
Expand Down