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Add BufWriter::buffer method #55211

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Merged
merged 4 commits into from
Nov 15, 2018
Merged

Add BufWriter::buffer method #55211

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7eece47
Add BufWriter::buffer method
fintelia Oct 19, 2018
07d966d
Add some tests
fintelia Oct 27, 2018
40e4144
Suggested edits
fintelia Nov 1, 2018
59a0309
Fix compile errors in test
fintelia Nov 1, 2018
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@fintelia
fintelia committed Nov 2, 2018
commit 40e41440e46a56b5d5fd66473c23efff6d44be3f
48 changes: 24 additions & 24 deletions src/libstd/io/buffered.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -534,7 +534,7 @@ impl<W: Write> BufWriter<W> {
/// use std::io::BufWriter;
/// use std::net::TcpStream;
///
/// let mut buf_writer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());
/// let buf_writer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());
///
/// // See how many bytes are currently buffered
/// let bytes_buffered = buf_writer.buffer().len();
Expand Down Expand Up @@ -985,30 +985,30 @@ mod tests {
let nread = reader.read(&mut buf);
assert_eq!(nread.unwrap(), 3);
assert_eq!(buf, [5, 6, 7]);
assert_eq!(*reader.buffer(), []);
assert_eq!(reader.buffer(), []);

let mut buf = [0, 0];
let nread = reader.read(&mut buf);
assert_eq!(nread.unwrap(), 2);
assert_eq!(buf, [0, 1]);
assert_eq!(*reader.buffer(), []);
assert_eq!(reader.buffer(), []);

let mut buf = [0];
let nread = reader.read(&mut buf);
assert_eq!(nread.unwrap(), 1);
assert_eq!(buf, [2]);
assert_eq!(*reader.buffer(), [3]);
assert_eq!(reader.buffer(), [3]);

let mut buf = [0, 0, 0];
let nread = reader.read(&mut buf);
assert_eq!(nread.unwrap(), 1);
assert_eq!(buf, [3, 0, 0]);
assert_eq!(*reader.buffer(), []);
assert_eq!(reader.buffer(), []);

let nread = reader.read(&mut buf);
assert_eq!(nread.unwrap(), 1);
assert_eq!(buf, [4, 0, 0]);
assert_eq!(*reader.buffer(), []);
assert_eq!(reader.buffer(), []);

assert_eq!(reader.read(&mut buf).unwrap(), 0);
}
Expand Down Expand Up @@ -1097,41 +1097,41 @@ mod tests {
let mut writer = BufWriter::with_capacity(2, inner);

writer.write(&[0, 1]).unwrap();
assert_eq!(*writer.buffer(), []);
assert_eq!(*writer.get_ref(), [0, 1]);
assert_eq!(writer.buffer(), []);
assert_eq!(writer.get_ref(), [0, 1]);

writer.write(&[2]).unwrap();
assert_eq!(*writer.buffer(), [2]);
assert_eq!(*writer.get_ref(), [0, 1]);
assert_eq!(writer.buffer(), [2]);
assert_eq!(writer.get_ref(), [0, 1]);

writer.write(&[3]).unwrap();
assert_eq!(*writer.buffer(), [2, 3]);
assert_eq!(*writer.get_ref(), [0, 1]);
assert_eq!(writer.buffer(), [2, 3]);
assert_eq!(writer.get_ref(), [0, 1]);

writer.flush().unwrap();
assert_eq!(*writer.buffer(), []);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3]);
assert_eq!(writer.buffer(), []);
assert_eq!(writer.get_ref(), [0, 1, 2, 3]);

writer.write(&[4]).unwrap();
writer.write(&[5]).unwrap();
assert_eq!(*writer.buffer(), [4, 5]);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3]);
assert_eq!(writer.buffer(), [4, 5]);
assert_eq!(writer.get_ref(), [0, 1, 2, 3]);

writer.write(&[6]).unwrap();
assert_eq!(*writer.buffer(), [6]);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5]);
assert_eq!(writer.buffer(), [6]);
assert_eq!(writer.get_ref(), [0, 1, 2, 3, 4, 5]);

writer.write(&[7, 8]).unwrap();
assert_eq!(*writer.buffer(), []);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8]);
assert_eq!(writer.buffer(), []);
assert_eq!(writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8]);

writer.write(&[9, 10, 11]).unwrap();
assert_eq!(*writer.buffer(), []);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
assert_eq!(writer.buffer(), []);
assert_eq!(writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);

writer.flush().unwrap();
assert_eq!(*writer.buffer(), []);
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
assert_eq!(writer.buffer(), []);
assert_eq!(writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]);
}

#[test]
Expand Down