Struct IntoInnerError

struct IntoInnerError<W>(_, _)

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");
    }
};

Implementations

impl<W> IntoInnerError<W>

fn error(self: &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.");
    }
};

fn into_inner(self: 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()
    }
};

fn into_error(self: 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);

fn into_parts(self: 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");

impl<T> Any for IntoInnerError<W>

fn type_id(self: &Self) -> TypeId

impl<T> Borrow for IntoInnerError<W>

fn borrow(self: &Self) -> &T

impl<T> BorrowMut for IntoInnerError<W>

fn borrow_mut(self: &mut Self) -> &mut T

impl<T> From for IntoInnerError<W>

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> ToString for IntoInnerError<W>

fn to_string(self: &Self) -> String

impl<T, U> Into for IntoInnerError<W>

fn into(self: Self) -> U

Calls U::from(self).

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

impl<T, U> TryFrom for IntoInnerError<W>

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

impl<T, U> TryInto for IntoInnerError<W>

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

impl<W> Display for IntoInnerError<W>

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

impl<W> Freeze for IntoInnerError<W>

impl<W> RefUnwindSafe for IntoInnerError<W>

impl<W> Send for IntoInnerError<W>

impl<W> Sync for IntoInnerError<W>

impl<W> Unpin for IntoInnerError<W>

impl<W> UnsafeUnpin for IntoInnerError<W>

impl<W> UnwindSafe for IntoInnerError<W>

impl<W: $crate::fmt::Debug> Debug for IntoInnerError<W>

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

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