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use alloc::{
borrow::Cow,
fmt::{self, Display, Formatter},
};
use core::{
ops::Deref,
};
#[cfg(feature="std")]
use std::io;
#[derive(Debug)]
pub struct Error<'a> {
pub msg: Cow<'a, str>,
}
impl<'a> Error<'a> {
pub fn new<S>(msg: S) -> Self where S: Into<Cow<'a, str>> {
Self {
msg: msg.into(),
}
}
}
impl Display for Error<'_> {
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
f.write_str(&self.msg)
}
}
#[cfg(feature="std")]
impl<'a> From<Error<'a>> for io::Error {
fn from(err: Error<'a>) -> Self {
io::Error::new(io::ErrorKind::InvalidData, err.msg)
}
}
#[derive(Debug)]
pub struct ReadOnlyError<'a> {
err: Error<'a>,
}
impl<'a> ReadOnlyError<'a> {
pub const fn new(err: Error<'a>) -> Self {
Self {
err,
}
}
}
impl<'a> Deref for ReadOnlyError<'a> {
type Target = Error<'a>;
fn deref(&self) -> &Self::Target {
&self.err
}
}
impl Display for ReadOnlyError<'_> {
fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
self.err.fmt(f)
}
}
impl<'a> From<Error<'a>> for ReadOnlyError<'a> {
fn from(err: Error<'a>) -> Self {
Self::new(err)
}
}
#[cfg(feature="std")]
impl<'a> From<ReadOnlyError<'a>> for io::Error {
fn from(err: ReadOnlyError<'a>) -> Self {
err.into()
}
}