Struct std::io::WriterPanicked

1.56.0 · source ·

pub struct WriterPanicked { /* private fields */ }

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");

Run

Implementations

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impl WriterPanicked

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pub fn into_inner(self) -> Vec<u8>iNotable traits for Vec<u8, A>impl<A: Allocator> Write for Vec<u8, A>

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

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impl Debug for WriterPanicked

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

Formats the value using the given formatter. Read more

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impl Display for WriterPanicked

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

Formats the value using the given formatter. Read more

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impl Error for WriterPanicked

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fn description(&self) -> &str

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

Read more

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, req: &mut Demand<'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