WriterPanicked in std::io - Rust (original) (raw)
Struct 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");1.56.0 · Source
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.
👎Deprecated since 1.42.0: use the Display impl or to_string()
Returns the lower-level source of this error, if any. Read more
👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
🔬This is a nightly-only experimental API. (error_generic_member_access #99301)
Provides type-based access to context intended for error reports. Read more