std: Allow ?Sized parameters in std::io::copy
std::io::copy did not allow passing trait objects directly (only with an extra &mut wrapping).
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@ -45,7 +45,9 @@ use io::{self, Read, Write, ErrorKind, BufRead};
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/// # }
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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pub fn copy<R: Read, W: Write>(reader: &mut R, writer: &mut W) -> io::Result<u64> {
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pub fn copy<R: ?Sized, W: ?Sized>(reader: &mut R, writer: &mut W) -> io::Result<u64>
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where R: Read, W: Write
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{
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let mut buf = [0; super::DEFAULT_BUF_SIZE];
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let mut written = 0;
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loop {
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@ -153,7 +155,17 @@ mod tests {
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use prelude::v1::*;
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use io::prelude::*;
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use io::{sink, empty, repeat};
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use io::{copy, sink, empty, repeat};
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#[test]
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fn copy_copies() {
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let mut r = repeat(0).take(4);
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let mut w = sink();
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assert_eq!(copy(&mut r, &mut w).unwrap(), 4);
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let mut r = repeat(0).take(1 << 17);
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assert_eq!(copy(&mut r as &mut Read, &mut w as &mut Write).unwrap(), 1 << 17);
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}
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#[test]
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fn sink_sinks() {
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