Struct serde::lib::core::io::WriterPanicked

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

Implementations

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

Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
👎Deprecated since 1.42.0: use the Display impl or to_string()
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)
Provides type based access to context intended for error reports. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

🔬This is a nightly-only experimental API. (provide_any)
Data providers should implement this method to provide all values they are able to provide by using demand. Read more
Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.