Struct IntoInnerError

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

Available on crate feature std only.

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>

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.");
    }
};

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()
    }
};

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);

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");

Trait Implementations

impl<W> Debug for IntoInnerError<W>

where W: Debug,

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

Formats the value using the given formatter.

impl<W> Display for IntoInnerError<W>

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

Formats the value using the given formatter.

impl<W> Error for IntoInnerError<W>

where W: Send + Debug,

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

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

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

Converts to this type from the input type.

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.