diff options
Diffstat (limited to 'src/libstd/io/util.rs')
| -rw-r--r-- | src/libstd/io/util.rs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/libstd/io/util.rs b/src/libstd/io/util.rs index e78bd1dd33f..faa52226a03 100644 --- a/src/libstd/io/util.rs +++ b/src/libstd/io/util.rs @@ -83,6 +83,8 @@ impl<R: Buffer> Buffer for LimitReader<R> { /// A `Writer` which ignores bytes written to it, like /dev/null. pub struct NullWriter; +impl Copy for NullWriter {} + impl Writer for NullWriter { #[inline] fn write(&mut self, _buf: &[u8]) -> io::IoResult<()> { Ok(()) } @@ -91,6 +93,8 @@ impl Writer for NullWriter { /// A `Reader` which returns an infinite stream of 0 bytes, like /dev/zero. pub struct ZeroReader; +impl Copy for ZeroReader {} + impl Reader for ZeroReader { #[inline] fn read(&mut self, buf: &mut [u8]) -> io::IoResult<uint> { @@ -111,6 +115,8 @@ impl Buffer for ZeroReader { /// A `Reader` which is always at EOF, like /dev/null. pub struct NullReader; +impl Copy for NullReader {} + impl Reader for NullReader { #[inline] fn read(&mut self, _buf: &mut [u8]) -> io::IoResult<uint> { |