# Struct std::io::IntoInnerError

1.0.0 · source ·

    pub struct IntoInnerError<W>(/* private fields */);

Expand description

An error returned by `BufWriter::into_inner` which combines an error that happened while writing out the buffer, and the buffered writer object which may be used to recover from the condition.

## Examples

    use std::io::BufWriter;
    use std::net::TcpStream;

    let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());

    // do stuff with the stream

    // we want to get our `TcpStream` back, so let's try:

    let stream = match stream.into_inner() {
        Ok(s) => s,
        Err(e) => {
            // Here, e is an IntoInnerError
            panic!("An error occurred");
        }
    };

Run

## Implementations§

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### impl<W> IntoInnerError<W>

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#### pub fn error(&self) -> &Error

Returns the error which caused the call to `BufWriter::into_inner()` to fail.

This error was returned when attempting to write the internal buffer.

##### Examples

    use std::io::BufWriter;
    use std::net::TcpStream;

    let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());

    // do stuff with the stream

    // we want to get our `TcpStream` back, so let's try:

    let stream = match stream.into_inner() {
        Ok(s) => s,
        Err(e) => {
            // Here, e is an IntoInnerError, let's log the inner error.
            //
            // We'll just 'log' to stdout for this example.
            println!("{}", e.error());

            panic!("An unexpected error occurred.");
        }
    };

Run
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#### pub fn into_inner(self) -> W

Returns the buffered writer instance which generated the error.

The returned object can be used for error recovery, such as re-inspecting the buffer.

##### Examples

    use std::io::BufWriter;
    use std::net::TcpStream;

    let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());

    // do stuff with the stream

    // we want to get our `TcpStream` back, so let's try:

    let stream = match stream.into_inner() {
        Ok(s) => s,
        Err(e) => {
            // Here, e is an IntoInnerError, let's re-examine the buffer:
            let buffer = e.into_inner();

            // do stuff to try to recover

            // afterwards, let's just return the stream
            buffer.into_inner().unwrap()
        }
    };

Run
1.55.0 · source

#### pub fn into_error(self) -> Error

Consumes the `IntoInnerError` and returns the error which caused the call to `BufWriter::into_inner()` to fail. Unlike `error`, this can be used to obtain ownership of the underlying error.

##### Example

    use std::io::{BufWriter, ErrorKind, Write};

    let mut not_enough_space = [0u8; 10];
    let mut stream = BufWriter::new(not_enough_space.as_mut());
    write!(stream, "this cannot be actually written").unwrap();
    let into_inner_err = stream.into_inner().expect_err("now we discover it's too small");
    let err = into_inner_err.into_error();
    assert_eq!(err.kind(), ErrorKind::WriteZero);

Run
1.55.0 · source

#### pub fn into_parts(self) -> (Error, W)

Consumes the `IntoInnerError` and returns the error which caused the call to `BufWriter::into_inner()` to fail, and the underlying writer.

This can be used to simply obtain ownership of the underlying error; it can also be used for advanced error recovery.

##### Example

    use std::io::{BufWriter, ErrorKind, Write};

    let mut not_enough_space = [0u8; 10];
    let mut stream = BufWriter::new(not_enough_space.as_mut());
    write!(stream, "this cannot be actually written").unwrap();
    let into_inner_err = stream.into_inner().expect_err("now we discover it's too small");
    let (err, recovered_writer) = into_inner_err.into_parts();
    assert_eq!(err.kind(), ErrorKind::WriteZero);
    assert_eq!(recovered_writer.buffer(), b"t be actually written");

Run

## Trait Implementations§

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### impl<W: Debug> Debug for IntoInnerError<W>

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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<W> Display for IntoInnerError<W>

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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<W: Send + Debug> Error for IntoInnerError<W>

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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
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#### 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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### impl<W> From<IntoInnerError<W>> for Error

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#### fn from(iie: IntoInnerError<W>) -> Error

Converts to this type from the input type.

## Auto Trait Implementations§

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### impl<W> !RefUnwindSafe for IntoInnerError<W>

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### impl<W> Send for IntoInnerError<W>where W: Send,

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### impl<W> Sync for IntoInnerError<W>where W: Sync,

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### impl<W> Unpin for IntoInnerError<W>where W: Unpin,

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### impl<W> !UnwindSafe for IntoInnerError<W>

## Blanket Implementations§

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

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

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

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

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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

Returns the argument unchanged.

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

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

Calls `U::from(self)`.

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

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

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

Converts the given value to a `String`. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.