[][src]Struct failure::SyncFailure

pub struct SyncFailure<T> { /* fields omitted */ }

Wrapper for std errors to make them Sync.

This exists to coerce existing types that are only Error + Send + 'static into a Fail-compatible representation, most notably for types generated by error-chain.

Unfortunately, this requires wrapping the error in a Mutex, which must be locked for every Debug/Display. Therefore, this should be something of a last resort in making the error work with failure.

Methods

impl<E: Error + Send + 'static> SyncFailure<E>[src]

pub fn new(err: E) -> Self[src]

Wraps a non-Sync Error in order to make it implement Fail.

Example

extern crate failure;

use failure::{Error, SyncFailure};
use std::cell::RefCell;

#[derive(Debug)]
struct NonSyncError {
    // RefCells are non-Sync, so structs containing them will be
    // non-Sync as well.
    count: RefCell<usize>,
}

// implement Display/Error for NonSyncError...

fn returns_error() -> Result<(), NonSyncError> {
    // Do stuff
}

fn my_function() -> Result<(), Error> {
    // without the map_err here, we end up with a compile error
    // complaining that NonSyncError doesn't implement Sync.
    returns_error().map_err(SyncFailure::new)?;
    // Do more stuff
}

Trait Implementations

impl<E: Error + Send + 'static> Fail for SyncFailure<E>[src]

fn name(&self) -> Option<&str>[src]

Returns the "name" of the error. Read more

fn cause(&self) -> Option<&dyn Fail>[src]

Returns a reference to the underlying cause of this failure, if it is an error that wraps other errors. Read more

fn backtrace(&self) -> Option<&Backtrace>[src]

Returns a reference to the Backtrace carried by this failure, if it carries one. Read more

fn context<D>(self, context: D) -> Context<D> where
    D: Display + Send + Sync + 'static,
    Self: Sized
[src]

Provides context for this failure. Read more

fn compat(self) -> Compat<Self> where
    Self: Sized
[src]

Wraps this failure in a compatibility wrapper that implements std::error::Error. Read more

impl<T> Debug for SyncFailure<T> where
    T: Debug
[src]

impl<T> Display for SyncFailure<T> where
    T: Display
[src]

Auto Trait Implementations

impl<T> Send for SyncFailure<T> where
    T: Send

impl<T> Sync for SyncFailure<T> where
    T: Send

Blanket Implementations

impl<E> Fail for E where
    E: 'static + Error + Send + Sync
[src]

fn name(&self) -> Option<&str>[src]

Returns the "name" of the error. Read more

fn cause(&self) -> Option<&dyn Fail>[src]

Returns a reference to the underlying cause of this failure, if it is an error that wraps other errors. Read more

fn backtrace(&self) -> Option<&Backtrace>[src]

Returns a reference to the Backtrace carried by this failure, if it carries one. Read more

fn context<D>(self, context: D) -> Context<D> where
    D: Display + Send + Sync + 'static,
    Self: Sized
[src]

Provides context for this failure. Read more

fn compat(self) -> Compat<Self> where
    Self: Sized
[src]

Wraps this failure in a compatibility wrapper that implements std::error::Error. Read more

impl<T> From for T[src]

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T, U> TryFrom for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.