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//! Helper: A cloneable wrapper for io::Result.
//!
//! This is all necessary because io::Error doesn't implement `Clone`.
use std::{io, sync::Arc};
/// A helper type for a variation on an `io::Error` that we can clone.
pub(crate) type ArcIoResult<R> = Result<R, Arc<io::Error>>;
/// Extension trait for `Result<T, Arc<io::Error>>`
pub(crate) trait ArcIoResultExt<T> {
/// Create a new `io::Result<T>` from this `ArcIoResult<T>`
///
/// We do this by making a new new io::Error (if necessary)
/// with [`wrap_error`].
fn io_result(&self) -> io::Result<T>;
}
impl<T: Clone> ArcIoResultExt<T> for ArcIoResult<T> {
fn io_result(&self) -> io::Result<T> {
match &self {
Ok(r) => Ok(r.clone()),
Err(e) => Err(wrap_error(e)),
}
}
}
/// Wrap an Arc<io::Error> as a new io::Error.
pub(crate) fn wrap_error(e: &Arc<io::Error>) -> io::Error {
io::Error::new(e.kind(), Arc::clone(e))
}
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