# 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§

source§

### impl WriterPanicked

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§

source§

### impl Debug for WriterPanicked

source§

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

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

### impl Display for WriterPanicked

source§

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

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

### impl Error for WriterPanicked

source§

#### 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
source§

#### 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

## Auto Trait Implementations§

§

### impl RefUnwindSafe for WriterPanicked

§

### impl Send for WriterPanicked

§

### impl Sync for WriterPanicked

§

### impl Unpin for WriterPanicked

§

### impl UnwindSafe for WriterPanicked

## Blanket Implementations§

source§

### impl<T> Any for Twhere T: 'static + ?Sized,

source§

#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
source§

### impl<T> Borrow<T> for Twhere T: ?Sized,

source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

### impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

### impl<T> From<T> for T

source§

#### fn from(t: T) -> T

Returns the argument unchanged.

source§

### impl<T, U> Into<U> for Twhere U: From<T>,

source§

#### fn into(self) -> U

Calls `U::from(self)`.

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

source§

### impl<T> ToString for Twhere T: Display + ?Sized,

source§

#### default fn to_string(&self) -> String

Converts the given value to a `String`. Read more
source§

### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

#### type Error = Infallible

The type returned in the event of a conversion error.
source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.