Struct tracing::stdlib::io::WriterPanicked

1.56.0 · source ·
pub struct WriterPanicked {
    buf: Vec<u8>,
}
Expand description

Error returned for the buffered data from BufWriter::into_parts, when the underlying writer has previously panicked. Contains the (possibly partly written) buffered data.

§Example

use std::io::{self, BufWriter, Write};
use std::panic::{catch_unwind, AssertUnwindSafe};

struct PanickingWriter;
impl Write for PanickingWriter {
  fn write(&mut self, buf: &[u8]) -> io::Result<usize> { panic!() }
  fn flush(&mut self) -> io::Result<()> { panic!() }
}

let mut stream = BufWriter::new(PanickingWriter);
write!(stream, "some data").unwrap();
let result = catch_unwind(AssertUnwindSafe(|| {
    stream.flush().unwrap()
}));
assert!(result.is_err());
let (recovered_writer, buffered_data) = stream.into_parts();
assert!(matches!(recovered_writer, PanickingWriter));
assert_eq!(buffered_data.unwrap_err().into_inner(), b"some data");

Fields§

§buf: Vec<u8>

Implementations§

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impl WriterPanicked

1.56.0 · source

pub fn into_inner(self) -> Vec<u8>

Returns the perhaps-unwritten data. Some of this data may have been written by the panicking call(s) to the underlying writer, so simply writing it again is not a good idea.

Trait Implementations§

1.56.0 · source§

impl Debug for WriterPanicked

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
1.56.0 · source§

impl Display for WriterPanicked

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
1.56.0 · source§

impl Error for WriterPanicked

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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
1.30.0 · source§

fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more
1.0.0 · source§

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access #99301)
Provides type based access to context intended for error reports. Read more

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default fn to_string(&self) -> String

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type Error = Infallible

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type Error = <U as TryFrom<T>>::Error

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