impl Display for io::ErrorKind

This avoids having to convert from `ErrorKind` to `Error` just to print the error message.
This commit is contained in:
Joshua Nelson 2022-01-19 13:43:27 -06:00
parent 5e57faa78a
commit f8ee57be2c

View File

@ -361,13 +361,29 @@ impl ErrorKind {
}
}
#[stable(feature = "io_errorkind_display", since = "1.60.0")]
impl fmt::Display for ErrorKind {
/// Shows a human-readable description of the `ErrorKind`.
///
/// This is similar to `impl Display for Error`, but doesn't require first converting to Error.
///
/// # Examples
/// ```
/// use std::io::ErrorKind;
/// assert_eq!("entity not found", ErrorKind::NotFound.to_string());
/// ```
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.write_str(self.as_str())
}
}
/// Intended for use for errors not exposed to the user, where allocating onto
/// the heap (for normal construction via Error::new) is too costly.
#[stable(feature = "io_error_from_errorkind", since = "1.14.0")]
impl From<ErrorKind> for Error {
/// Converts an [`ErrorKind`] into an [`Error`].
///
/// This conversion allocates a new error with a simple representation of error kind.
/// This conversion creates a new error with a simple representation of error kind.
///
/// # Examples
///